--[=[ BuffTrigger2.lua
This file contains the "aura2" trigger for buffs and debuffs. It has replaced the older Bufftrigger 1, which is now gone.

It registers the BuffTrigger table for the trigger type "aura2" and has the following API:

Add(data)
Adds an aura, setting up internal data structures for all buff triggers.

LoadDisplays(id)
Loads the aura ids, enabling all buff triggers in the aura.

UnloadDisplays(id)
Unloads the aura ids, disabling all buff triggers in the aura.

UnloadAll()
Unloads all auras, disabling all buff triggers.

Delete(id)
Removes all data for aura id.

Rename(oldid, newid)
Updates all data for aura oldid to use newid.

Modernize(data)
Updates all buff triggers in data.

#####################################################
# Helper functions mainly for the WeakAuras Options #
#####################################################

CanHaveDuration(data, triggernum)
Returns whether the trigger can have a duration.

GetOverlayInfo(data, triggernum)
Returns a table containing all overlays. Currently there aren't any

CanHaveClones(data, triggernum)
Returns whether the trigger can have clones.

CanHaveTooltip(data, triggernum)
Returns the type of tooltip to show for the trigger.

GetNameAndIcon(data, triggernum)
Returns the name and icon to show in the options.

GetAdditionalProperties(data, triggernum)
Returns the tooltip text for additional properties.

GetTriggerConditions(data, triggernum)
Returns the potential conditions for a trigger
]=]--
if not WeakAuras.IsLibsOK() then return end
--- @type string, Private
local AddonName, Private = ...

-- Lua APIs
local tinsert, wipe = table.insert, wipe
local pairs, next, type = pairs, next, type
local UnitAura = UnitAura

local LCD
if WeakAuras.IsClassicEra() then
  LCD = LibStub("LibClassicDurations")
  LCD:Register("WeakAuras")
  UnitAura = LCD.UnitAuraWithBuffs
end

local newAPI = WeakAuras.IsRetail()

local WeakAuras = WeakAuras
local L = WeakAuras.L
local timer = WeakAuras.timer
local BuffTrigger = {}
local triggerInfos = {}

local watched_trigger_events = Private.watched_trigger_events

local UnitGroupRolesAssigned = WeakAuras.IsWrathOrRetail() and UnitGroupRolesAssigned or function() return "DAMAGER" end

-- keyed on unit, debuffType, spellname, with a scan object value
-- scan object: id, triggernum, scanFunc
local scanFuncName = {}
local scanFuncSpellId = {}
local scanFuncGeneral = {}

-- same as above but for group triggers
local scanFuncNameGroup = {}
local scanFuncSpellIdGroup = {}
local scanFuncGeneralGroup = {}

-- Contains all scanFuncs that should be check if the existence of a unit changed
local unitExistScanFunc = {}
-- Which units exist
local existingUnits = {}

-- Contains all scanFuncs that fetch the role + roleIcon
local groupRoleScanFunc = {}

-- Loaded ScanFuncs per unit type
local groupScanFuncs = {}
--Active ScanFuncs per actual unit id
local activeGroupScanFuncs = {}

local raidMarkScanFuncs = {}

-- Multi Target tracking
local scanFuncNameMulti = {}
local scanFuncSpellIdMulti = {}
local cleanupTimerMulti = {}

-- Auras that matched, unit, index
local matchData = {}

local matchDataUpToDate = {}

local matchDataMulti = {}
-- Auras that matched, keyed on id, triggernum, kept in sync with matchData
local matchDataByTrigger = {}

local matchDataChanged = {}

local nameplateExists = {}
local unitVisible = {}

local function UnitExistsFixed(unit)
  if #unit > 9 and unit:sub(1, 9) == "nameplate" then
    return nameplateExists[unit]
  end
  return UnitExists(unit) or UnitGUID(unit)
end

local function UnitIsVisibleFixed(unit)
  if unitVisible[unit] == nil then
    unitVisible[unit] = UnitIsVisible(unit)
  end
  return unitVisible[unit]
end

local function UnitInSubgroupOrPlayer(unit, includePets)
  if includePets == nil then
    return UnitInSubgroup(unit) or UnitIsUnit("player", unit)
  elseif includePets == "PlayersAndPets" then
    return UnitInSubgroup(WeakAuras.petUnitToUnit[unit] or unit) or UnitIsUnit("player", unit) or UnitIsUnit("pet", unit)
  elseif includePets == "PetsOnly" then
    return UnitInSubgroup(WeakAuras.petUnitToUnit[unit]) or UnitIsUnit("pet", unit)
  end
end

local function GetOrCreateSubTable(base, next, ...)
  if not next then
    return base
  end

  base[next] = base[next] or {}
  return GetOrCreateSubTable(base[next], ...)
end

local function GetSubTable(base, next, ...)
  if not base then
    return nil
  end

  if not next then
    return base
  end

  return GetSubTable(base[next], ...)
end

local function IsGroupTrigger(trigger)
  return trigger.unit == "group" or trigger.unit == "party" or trigger.unit == "raid"
         or trigger.unit == "boss" or trigger.unit == "nameplate" or trigger.unit == "arena" or trigger.unit == "multi"
end

local function IsSingleMissing(trigger)
  return not IsGroupTrigger(trigger) and trigger.matchesShowOn == "showOnMissing"
end

local function CanHaveMatchCheck(trigger)
  if IsGroupTrigger(trigger) then
    return true
  end
  if trigger.matchesShowOn == "showOnMissing" then
    return false
  end
  if trigger.matchesShowOn == "showOnActive" or trigger.matchesShowOn == "showOnMatches" or not trigger.matchesShowOn then
    return true
  end
  -- Always: If clones are shown
  return trigger.showClones
end

local function HasMatchCount(trigger)
  if IsGroupTrigger(trigger) then
    return trigger.useMatch_count
  else
    return trigger.matchesShowOn == "showOnMatches"
  end
end

local function ReferenceMatchData(id, triggernum, unit, filter, index)
  local match = matchData[unit][filter][index]
  local base = GetOrCreateSubTable(matchDataByTrigger, id, triggernum, unit)

  base[index] = match

  match.auras[id] = match.auras[id] or {}
  match.auras[id][triggernum] = true
end

local function ScanMatchData(time, triggerInfo, unit, filter)
  if matchData[unit] and matchData[unit][filter] then
    for index, match in pairs(matchData[unit][filter]) do
      if (not triggerInfo.auranames and not triggerInfo.auraspellids)
          or (triggerInfo.auranames and tContains(triggerInfo.auranames, match.name))
          or (triggerInfo.auraspellids and tContains(triggerInfo.auraspellids, match.spellId)) then
        if triggerInfo.fetchTooltip then
          matchData[unit][filter][index]:UpdateTooltip(time)
        end
        if not triggerInfo.scanFunc or triggerInfo.scanFunc(time, matchData[unit][filter][index]) then
          local id = triggerInfo.id
          local triggernum = triggerInfo.triggernum
          ReferenceMatchData(id, triggernum, unit, filter, index)
          matchDataChanged[id] = matchDataChanged[id] or {}
          matchDataChanged[id][triggernum] = true
        end
      end
    end
  end
end

local function ReferenceMatchDataMulti(matchData, id, triggernum, destGUID)
  local needToInsert = false

  matchData.auras[id] = matchData.auras[id] or {}
  needToInsert = not matchData.auras[id][triggernum]
  matchData.auras[id][triggernum] = true

  if needToInsert then
    local matchDataByTriggerBase = GetOrCreateSubTable(matchDataByTrigger, id, triggernum, destGUID)
    tinsert(matchDataByTriggerBase, matchData)
  end
  matchDataChanged[id] = matchDataChanged[id] or {}
  matchDataChanged[id][triggernum] = true
end

local function MatchesTriggerInfoMulti(triggerInfo, sourceGUID)
  if triggerInfo.ownOnly then
    return sourceGUID == UnitGUID("player") or sourceGUID == UnitGUID("pet")
  elseif triggerInfo.ownOnly == false then
    return sourceGUID ~= UnitGUID("player") and sourceGUID ~= UnitGUID("pet")
  else
    return true
  end
end

local function UpdateToolTipDataInMatchData(matchData, time)
  if matchData.tooltipUpdated == time then
    return
  end
  local changed = false

  if matchData.unit and matchData.auraInstanceID then
    local tooltip, _, tooltip1, tooltip2, tooltip3, tooltip4 = WeakAuras.GetAuraInstanceTooltipInfo(matchData.unit, matchData.auraInstanceID, matchData.filter)
    changed = matchData.tooltip ~= tooltip or matchData.tooltip1 ~= tooltip1
      or matchData.tooltip2 ~= tooltip2 or matchData.tooltip3 ~= tooltip3 or matchData.tooltip4 ~= tooltip4
    matchData.tooltip, matchData.tooltip1, matchData.tooltip2, matchData.tooltip3, matchData.tooltip4 = tooltip, tooltip1, tooltip2, tooltip3, tooltip4
  elseif matchData.unit and matchData.index and matchData.filter then
    local tooltip, _, tooltip1, tooltip2, tooltip3, tooltip4 = WeakAuras.GetAuraTooltipInfo(matchData.unit, matchData.index, matchData.filter)
    changed = matchData.tooltip ~= tooltip or matchData.tooltip1 ~= tooltip1
      or matchData.tooltip2 ~= tooltip2 or matchData.tooltip3 ~= tooltip3 or matchData.tooltip4 ~= tooltip4
    matchData.tooltip, matchData.tooltip1, matchData.tooltip2, matchData.tooltip3, matchData.tooltip4 = tooltip, tooltip1, tooltip2, tooltip3, tooltip4
  end

  matchData.tooltipUpdated = time
  return changed
end

--- Compares two arrays (shallow)
---@param t1 any[]?
---@param t2 any[]?
---@return boolean
local function ArrayCompare(t1, t2)
  if t1 == nil then
    return t2 == nil
  end
  if t2 == nil then
    return false
  end
  if #t1 ~= #t2 then
    return false
  end
  for i = 1, #t1 do
    if t1[i] ~= t2[i] then
      return false
    end
  end
  return true
end

local function UpdateMatchData(time, matchDataChanged, unit, index, auraInstanceID, filter, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, isBossDebuff, isCastByPlayer, spellId, modRate, points)
  if not matchData[unit] then
    matchData[unit] = {}
  end
  if not matchData[unit][filter] then
    matchData[unit][filter] = {}
  end
  local key = index or auraInstanceID
  local debuffClassIcon = WeakAuras.EJIcons[debuffClass]
  if not matchData[unit][filter][key] then
    matchData[unit][filter][key] = {
      name = name,
      icon = icon,
      stacks = stacks,
      debuffClass = debuffClass,
      debuffClassIcon = debuffClassIcon,
      duration = duration,
      expirationTime = expirationTime,
      modRate = modRate,
      unitCaster = unitCaster,
      casterName = unitCaster and GetUnitName(unitCaster, false) or "",
      spellId = spellId,
      unit = unit,
      unitName = GetUnitName(unit, false) or "",
      isStealable = isStealable,
      isBossDebuff = isBossDebuff,
      isCastByPlayer = isCastByPlayer,
      time = time,
      lastChanged = time,
      filter = filter,
      index = index,
      points = points,
      auraInstanceID = auraInstanceID,
      UpdateTooltip = UpdateToolTipDataInMatchData,
      auras = {}
    }

    return true
  end

  local data = matchData[unit][filter][key]
  local changed = false

  if data.name ~= name then
    data.name = name
    changed = true
  end

  if data.icon ~= icon then
    data.icon = icon
    changed = true
  end

  if data.stacks ~= stacks then
    data.stacks = stacks
    changed = true
  end

  if data.debuffClass ~= debuffClass then
    data.debuffClass = debuffClass
    changed = true
  end

  if data.debuffClassIcon ~= debuffClassIcon then
    data.debuffClassIcon = debuffClassIcon
    changed = true
  end

  if data.duration ~= duration then
    data.duration = duration
    changed = true
  end

  if data.expirationTime ~= expirationTime then
    data.expirationTime = expirationTime
    changed = true
  end

  if data.modRate ~= modRate then
    data.modRate = modRate
    changed = true
  end

  if data.unitCaster ~= unitCaster then
    data.unitCaster = unitCaster
    changed = true
  end

  local casterName = unitCaster and GetUnitName(unitCaster, false) or ""
  if data.casterName ~= casterName then
    data.casterName = casterName
    changed = true
  end

  if data.spellId ~= spellId then
    data.spellId = spellId
    changed = true
  end

  if data.isStealable ~= isStealable then
    data.isStealable = isStealable
    changed = true
  end

  if data.isBossDebuff ~= isBossDebuff then
    data.isBossDebuff = isBossDebuff
    changed = true
  end

  if data.isCastByPlayer ~= isCastByPlayer then
    data.isCastByPlayer = isCastByPlayer
    changed = true
  end

  local unitName = GetUnitName(unit, false) or ""
  if data.unitName ~= unitName then
    data.unitName = unitName
    changed = true
  end

  if data.tooltipUpdated and data.tooltipUpdated < time then
    changed = data:UpdateTooltip(time) or changed
  end

  if not ArrayCompare(points, data.points) then
    data.points = points
    changed = true
  end

  if changed then
    data.lastChanged = time
  end

  if changed then
    -- Tell old auras that used this match data
    for id, triggerData in pairs(data.auras) do
      for triggernum in pairs(triggerData) do
        if matchDataByTrigger[id] and matchDataByTrigger[id][triggernum] and matchDataByTrigger[id][triggernum][unit] and matchDataByTrigger[id][triggernum][unit][key] then
          matchDataByTrigger[id][triggernum][unit][key] = nil
          matchDataChanged[id] = matchDataChanged[id] or {}
          matchDataChanged[id][triggernum] = true
        end
      end
    end
    wipe(data.auras)
  end

  data.index = index
  data.auraInstanceID = auraInstanceID
  data.time = time
  data.unit = unit

  return changed or data.lastChanged == time
end

local function calculateNextCheck(triggerInfoRemaining, auraDataRemaining, auraDataExpirationTime, modRate, nextCheck)
  if auraDataRemaining > 0 and auraDataRemaining >= triggerInfoRemaining then
    if not nextCheck then
      return auraDataExpirationTime - triggerInfoRemaining * modRate
    else
      return min(auraDataExpirationTime - triggerInfoRemaining * modRate, nextCheck)
    end
  end
  return nextCheck
end

local function FindBestMatchData(time, id, triggernum, triggerInfo, matchedUnits)
  -- Find best match
  local bestMatch = nil
  local matchCount = 0
  local unitCount = 0
  local stackCount = 0
  local nextCheck

  if not matchDataByTrigger[id] or not matchDataByTrigger[id][triggernum] then
    return nil, 0, 0
  end

  for unit, unitData in pairs(matchDataByTrigger[id][triggernum]) do
    local unitCounted = false
    for index, auraData in pairs(unitData) do
      local remCheck = true
      if triggerInfo.remainingFunc and auraData.expirationTime then
        local modRate = auraData.modRate or 1
        local remaining = (auraData.expirationTime - time) / modRate
        remCheck = triggerInfo.remainingFunc(remaining)
        nextCheck = calculateNextCheck(triggerInfo.remainingCheck, remaining, auraData.expirationTime, modRate, nextCheck)
      end

      if remCheck then
        matchCount = matchCount + 1
        stackCount = stackCount + (auraData.stacks or 0)
        matchedUnits[unit] = true
        if not unitCounted then
          unitCount = unitCount + 1
          unitCounted = true
        end
        if not bestMatch or triggerInfo.compareFunc(bestMatch, auraData) then
          bestMatch = auraData
        end
      end
    end
  end
  return bestMatch, matchCount, unitCount, stackCount, nextCheck
end

local function FindBestMatchDataForUnit(time, id, triggernum, triggerInfo, unit)
  -- Find best match
  local bestMatch = nil
  local matchCount = 0
  local stackCount = 0
  local nextCheck

  if not matchDataByTrigger[id] or not matchDataByTrigger[id][triggernum] or not matchDataByTrigger[id][triggernum][unit] then
    return nil, 0
  end

  for index, auraData in pairs(matchDataByTrigger[id][triggernum][unit]) do
    local remCheck = true
    if triggerInfo.remainingFunc and auraData.expirationTime then
      local modRate = auraData.modRate or 1
      local remaining = (auraData.expirationTime - time) / modRate
      remCheck = triggerInfo.remainingFunc(remaining)
      nextCheck = calculateNextCheck(triggerInfo.remainingCheck, remaining, auraData.expirationTime, modRate, nextCheck)
    end

    if remCheck then
      matchCount = matchCount + 1
      stackCount = stackCount + (auraData.stacks or 0)
      if not bestMatch or triggerInfo.compareFunc(bestMatch, auraData) then
        bestMatch = auraData
      end
    end
  end
  return bestMatch, matchCount, stackCount, nextCheck
end

local roleIcons = {
  DAMAGER = CreateTextureMarkup([=[Interface\LFGFrame\UI-LFG-ICON-ROLES]=], 256, 256, 0, 0, GetTexCoordsForRole("DAMAGER")),
  HEALER = CreateTextureMarkup([=[Interface\LFGFrame\UI-LFG-ICON-ROLES]=], 256, 256, 0, 0, GetTexCoordsForRole("HEALER")),
  TANK = CreateTextureMarkup([=[Interface\LFGFrame\UI-LFG-ICON-ROLES]=], 256, 256, 0, 0, GetTexCoordsForRole("TANK"))
}

local function UpdateStateWithMatch(time, bestMatch, triggerStates, cloneId, matchCount, unitCount, maxUnitCount, matchCountPerUnit, totalStacks, affected, unaffected, role, raidMark)
  local debuffClassIcon = WeakAuras.EJIcons[bestMatch.debuffClass]
  if not triggerStates[cloneId] then
    triggerStates[cloneId] = {
      show = true,
      changed = true,
      name = bestMatch.name,
      icon = bestMatch.icon,
      stacks = bestMatch.stacks,
      debuffClass = bestMatch.debuffClass,
      debuffClassIcon = debuffClassIcon,
      progressType = "timed",
      duration = bestMatch.duration,
      expirationTime = bestMatch.expirationTime,
      modRate = bestMatch.modRate,
      unitCaster = bestMatch.unitCaster,
      casterName = bestMatch.casterName,
      spellId = bestMatch.spellId,
      index = bestMatch.index,
      auraInstanceID = bestMatch.auraInstanceID,
      filter = bestMatch.filter,
      unit = bestMatch.unit,
      unitName = bestMatch.unitName,
      GUID = bestMatch.unit and UnitGUID(bestMatch.unit) or bestMatch.GUID,
      role = role,
      roleIcon = role and roleIcons[role],
      raidMark = raidMark,
      matchCount = matchCount,
      unitCount = unitCount,
      maxUnitCount = maxUnitCount,
      matchCountPerUnit = matchCountPerUnit,
      tooltip = bestMatch.tooltip,
      tooltip1 = bestMatch.tooltip1,
      tooltip2 = bestMatch.tooltip2,
      tooltip3 = bestMatch.tooltip3,
      tooltip4 = bestMatch.tooltip4,
      points = bestMatch.points,
      affected = affected,
      unaffected = unaffected,
      totalStacks = totalStacks,
      initialTime = time,
      refreshTime = time,
      active = true,
      time = time,
    }
    return true
  else
    local state = triggerStates[cloneId]
    local changed = false
    state.time = time

    if state.unit ~= bestMatch.unit then
      state.unit = bestMatch.unit
      changed = true
    end

    local GUID = bestMatch.unit and UnitGUID(bestMatch.unit) or bestMatch.GUID
    if state.GUID ~= GUID then
      state.GUID = GUID
      changed = true
    end

    if state.role ~= role then
      state.role = role
      state.roleIcon = roleIcons[role]
      changed = true
    end

    if state.raidMark ~= raidMark then
      state.raidMark = raidMark
      changed = true
    end

    if state.unitName ~= bestMatch.unitName then
      state.unitName = bestMatch.unitName
      changed = true
    end

    if state.show ~= true then
      state.show = true
      changed = true
    end

    if state.name ~= bestMatch.name then
      state.name = bestMatch.name
      changed = true
    end

    if state.icon ~= bestMatch.icon then
      state.icon = bestMatch.icon
      changed = true
    end

    if state.stacks ~= bestMatch.stacks then
      if state.stacks and bestMatch.stacks then
        if state.stacks < bestMatch.stacks then
          state.stackGainTime = time
          state.stackLostTime = nil
        else
          state.stackGainTime = nil
          state.stackLostTime = time
        end
      end
      state.stacks = bestMatch.stacks
      changed = true
    end

    if state.debuffClass ~= bestMatch.debuffClass then
      state.debuffClass = bestMatch.debuffClass
      changed = true
    end

    if state.debuffClassIcon ~= debuffClassIcon then
      state.debuffClassIcon = debuffClassIcon
      changed = true
    end

    if state.duration ~= bestMatch.duration then
      state.duration = bestMatch.duration
      changed = true
    end

    if not state.initialTime then
      -- Only set initialTime if it wasn't set before
      state.initialTime = time
      changed = true
    end

    if state.expirationTime ~= bestMatch.expirationTime then
      -- A bit fuzzy checking
      if state.expirationTime and bestMatch.expirationTime and bestMatch.expirationTime - state.expirationTime > 0.2  then
        state.refreshTime = time
      end
      state.expirationTime = bestMatch.expirationTime
      changed = true
    end

    if state.modRate ~= bestMatch.modRate then
      state.modRate = bestMatch.modRate
      changed = true
    end

    if state.progressType ~= "timed" then
      state.progressType = "timed"
      changed = true
    end

    if state.unitCaster ~= bestMatch.unitCaster then
      state.unitCaster = bestMatch.unitCaster
      state.casterName = bestMatch.casterName
      changed = true
    end

    if state.spellId ~= bestMatch.spellId then
      state.spellId = bestMatch.spellId
      changed = true
    end

    if state.index ~= bestMatch.index then
      state.index = bestMatch.index
      changed = true
    end

    if state.auraInstanceID ~= bestMatch.auraInstanceID then
      state.auraInstanceID = bestMatch.auraInstanceID
      changed = true
    end

    if state.filter ~= bestMatch.filter then
      state.filter = bestMatch.filter
      changed = true
    end

    if state.tooltip ~= bestMatch.tooltip then
      state.tooltip = bestMatch.tooltip
      changed = true
    end

    if state.tooltip1 ~= bestMatch.tooltip1 then
      state.tooltip1 = bestMatch.tooltip1
      changed = true
    end

    if state.tooltip2 ~= bestMatch.tooltip2 then
      state.tooltip2 = bestMatch.tooltip2
      changed = true
    end

    if state.tooltip3 ~= bestMatch.tooltip3 then
      state.tooltip3 = bestMatch.tooltip3
      changed = true
    end

    if state.tooltip4 ~= bestMatch.tooltip4 then
      state.tooltip4 = bestMatch.tooltip4
      changed = true
    end

    if not ArrayCompare(state.points, bestMatch.points) then
      state.points = bestMatch.points
      changed = true
    end

    if state.matchCount ~= matchCount then
      state.matchCount = matchCount
      changed = true
    end

    if state.unitCount ~= unitCount then
      state.unitCount = unitCount
      changed = true
    end

    if state.maxUnitCount ~= maxUnitCount then
      state.maxUnitCount = maxUnitCount
      changed = true
    end

    if state.matchCountPerUnit ~= matchCountPerUnit then
      state.matchCountPerUnit = matchCountPerUnit
      changed = true
    end

    if state.affected ~= affected then
      state.affected = affected
      changed = true
    end

    if state.unaffected ~= unaffected then
      state.unaffected = unaffected
      changed = true
    end

    if state.active ~= true then
      state.active = true
      changed = true
    end

    if state.totalStacks ~= totalStacks then
      state.totalStacks = totalStacks
      changed = true
    end

    if changed then
      state.changed = true
      return true
    end
  end
end

local function UpdateStateWithNoMatch(time, triggerStates, triggerInfo, cloneId, unit, matchCount, unitCount, maxUnitCount, matchCountPerUnit, totalStacks, affected, unaffected, role, raidMark)
  local fallbackName, fallbackIcon = BuffTrigger.GetNameAndIconSimple(WeakAuras.GetData(triggerInfo.id), triggerInfo.triggernum)
  if not triggerStates[cloneId] then
    triggerStates[cloneId] = {
      show = true,
      changed = true,
      progressType = 'timed',
      duration = 0,
      expirationTime = math.huge,
      modRate = 1,
      matchCount = matchCount,
      unitCount = unitCount,
      maxUnitCount = maxUnitCount,
      matchCountPerUnit = matchCountPerUnit,
      active = false,
      time = time,
      affected = affected,
      unaffected = unaffected,
      unit = unit,
      role = role,
      raidMark = raidMark,
      roleIcon = role and roleIcons[role],
      unitName = unit and GetUnitName(unit, false) or "",
      destName = "",
      name = fallbackName,
      icon = fallbackIcon,
      totalStacks = totalStacks
    }
    return true
  else
    local state = triggerStates[cloneId]
    state.time = time
    local changed = false

    if state.show ~= true then
      state.show = true
      changed = true
    end

    if state.name ~= fallbackName then
      state.name = fallbackName
      changed = true
    end

    if state.icon ~= fallbackIcon then
      state.icon = fallbackIcon
      changed = true
    end

    if state.stacks then
      state.stacks = nil
      changed = true
    end

    if state.duration then
      state.duration = nil
      changed = true
    end

    if state.initialTime then
      state.initialTime = nil
      changed = true
    end

    if state.refreshTime then
      state.refreshTime = nil
      changed = true
    end

    if state.expirationTime ~= math.huge then
      state.expirationTime = math.huge
      changed = true
    end

    if state.progressType then
      state.progressType = nil
      changed = true
    end

    if state.modRate ~= 1 then
      state.modRate = 1
      changed = true
    end

    if state.unit ~= unit then
      state.unit = unit
      changed = true
    end

    local GUID = unit and UnitGUID(unit)
    if state.GUID ~= GUID then
      state.GUID = GUID
      changed = true
    end

    if state.role ~= role then
      state.role = role
      state.roleIcon = roleIcons[role]
      changed = true
    end

    if state.raidMark ~= raidMark then
      state.raidMark = raidMark
      changed = true
    end

    local unitName = unit and GetUnitName(unit, false) or ""
    if state.unitName ~= unitName then
      state.unitName = unitName
      changed = true
    end

    if state.unitCaster then
      state.unitCaster = nil
      changed = true
    end

    if state.casterName ~= "" then
      state.casterName = ""
      changed = true
    end

    if state.spellId then
      state.spellId = nil
      changed = true
    end

    if state.index then
      state.index = nil
      changed = true
    end

    if state.auraInstanceID then
      state.auraInstanceID = nil
      changed = true
    end

    if state.tooltip or state.tooltip1 or state.tooltip2 or state.tooltip3 or state.tooltip4 then
      state.tooltip, state.tooltip1, state.tooltip2, state.tooltip3, state.tooltip4 = nil, nil, nil, nil, nil
      changed = true
    end

    if state.points then
      state.points = nil
      changed = true
    end

    if state.matchCount ~= matchCount then
      state.matchCount = matchCount
      changed = true
    end

    if state.unitCount ~= unitCount then
      state.unitCount = unitCount
      changed = true
    end

    if state.maxUnitCount ~= maxUnitCount then
      state.maxUnitCount = maxUnitCount
      changed = true
    end

    if state.matchCountPerUnit ~= matchCountPerUnit then
      state.matchCountPerUnit = matchCountPerUnit
      changed = true
    end

    if state.active then
      state.active = false
      changed = true
    end

    if state.affected ~= affected then
      state.affected = affected
      changed = true
    end

    if state.unaffected ~= unaffected then
      state.unaffected = unaffected
      changed = true
    end

    if state.totalStacks ~= totalStacks then
      state.totalStacks = totalStacks
      changed = true
    end

    if changed then
      state.changed = true
      return true
    end
  end
end

local function RemoveState(triggerStates, cloneId)
  local state = triggerStates[cloneId]
  if state then
    if state.show then
      state.show = false
      state.changed = true
      return true
    end
  end
end

local function GetAllUnits(unit, allUnits, includePets)
  if unit == "group" then
    if allUnits then
      local i = 1
      local raid = true
      local pets = true
      return function()
        if raid then
          if i <= 40 then
            local ret
            if includePets == "PlayersAndPets" then
              ret = pets and WeakAuras.raidpetUnits[i] or WeakAuras.raidUnits[i]
              pets = not pets
              if pets then
                i = i + 1
              end
            elseif includePets == "PetsOnly" then
              ret = WeakAuras.raidpetUnits[i]
              i = i + 1
            else -- raid
              ret = WeakAuras.raidUnits[i]
              i = i + 1
            end
            return ret
          end
          if includePets and pets then
            pets = not pets
            return "pet"
          end
          raid = false
          i = 1
          return "player"
        end

        if i <= 4 then
          local ret
          if includePets == "PlayersAndPets" then
            ret = pets and WeakAuras.partypetUnits[i] or WeakAuras.partyUnits[i]
            pets = not pets
            if pets then
              i = i + 1
            end
          elseif includePets == "PetsOnly" then
            ret = WeakAuras.partypetUnits[i]
            i = i + 1
          else -- group
            ret = WeakAuras.partyUnits[i]
            i = i + 1
          end
          return ret
        end

        i = 1
        raid = true
      end
    end

    -- allunits == false
    if IsInRaid() then
      local i = 1
      local max = GetNumGroupMembers()
      local pets = true
      return function()
        if i <= max then
          local ret
          if includePets == "PlayersAndPets" then
            ret = pets and WeakAuras.raidpetUnits[i] or WeakAuras.raidUnits[i]
            pets = not pets
            if pets then
              i = i + 1
            end
          elseif includePets == "PetsOnly" then
            ret = WeakAuras.raidpetUnits[i]
            i = i + 1
          else -- raid
            ret = WeakAuras.raidUnits[i]
            i = i + 1
          end
          return ret
        end
        i = 1
      end
    else
      local i = 0
      local max = GetNumSubgroupMembers()
      local pets = true
      return function()
        if i == 0 then
          if includePets == "PlayersAndPets" then
            local ret = pets and "pet" or "player"
            pets = not pets
            if pets then
                i = i + 1
            end
            return ret
          elseif includePets == "PetsOnly" then
            i = 1
            return "pet"
          else -- group
            i = 1
            return "player"
          end
        else
          if i <= max then
            local ret
            if includePets == "PlayersAndPets" then
              ret = pets and WeakAuras.partypetUnits[i] or WeakAuras.partyUnits[i]
              pets = not pets
              if pets then
                i = i + 1
              end
            elseif includePets == "PetsOnly" then
              ret = WeakAuras.partypetUnits[i]
              i = i + 1
            else -- group
              ret = WeakAuras.partyUnits[i]
              i = i + 1
            end
            return ret
          end
        end
        i = 0
      end
    end
  elseif unit == "boss" or unit == "arena" or unit == "nameplate" then
    local i = 1
    local max
    if unit == "boss" then
      max = 10
    elseif unit == "arena" then
      max = 5
    elseif unit == "nameplate" then
      max = 40
    else
      return function() end
    end
    return function()
      local ret = unit .. i
      while not allUnits and not UnitExistsFixed(ret) do
        i = i + 1
        if i > max then
          i = 1
          return nil
        end
        ret = unit .. i
      end
      i = i + 1
      if i > max then
        i = 1
        return nil
      end
      return ret
    end
  else
    local toggle = false
    return function()
      toggle = not toggle
      if toggle then
        return unit
      end
    end
  end
end

local function MaxUnitCount(triggerInfo)
  if triggerInfo.groupTrigger then
    return triggerInfo.maxUnitCount
  else
    return UnitExistsFixed(triggerInfo.unit) and 1 or 0
  end
end

local function TriggerInfoApplies(triggerInfo, unit)
  local controllingUnit = unit
  if WeakAuras.UnitIsPet(unit) then
    controllingUnit = WeakAuras.petUnitToUnit[unit]
  end

  if triggerInfo.ignoreSelf and UnitIsUnit("player", controllingUnit) then
    return false
  end

  if triggerInfo.ignoreDead and UnitIsDeadOrGhost(unit) then
    return false
  end

  if triggerInfo.ignoreDisconnected and not UnitIsConnected(unit) then
    return false
  end

  if triggerInfo.ignoreInvisible and not UnitIsVisibleFixed(unit) then
    return false
  end

  if triggerInfo.groupRole and not triggerInfo.groupRole[UnitGroupRolesAssigned(controllingUnit) or ""] then
    return false
  end

  if triggerInfo.raidRole and not triggerInfo.raidRole[WeakAuras.UnitRaidRole(controllingUnit) or ""] then
    return false
  end

  if triggerInfo.specId then
    local spec = Private.LibSpecWrapper.SpecForUnit(controllingUnit)
    if not triggerInfo.specId[spec] then
      return false
    end
  end

  if triggerInfo.arenaSpec and unit:sub(1, 5) == "arena" then
    -- GetArenaOpponentSpec doesn't use unit ids!
    local i = tonumber(unit:sub(6))
    if not triggerInfo.arenaSpec[GetArenaOpponentSpec(i)] then
      return false
    end
  end

  if triggerInfo.hostility and WeakAuras.GetPlayerReaction(unit) ~= triggerInfo.hostility then
    return false
  end

  if triggerInfo.unit == "group" then
    local isPet = WeakAuras.UnitIsPet(unit)
    if triggerInfo.includePets == "PetsOnly" and not isPet then
      return false
    elseif triggerInfo.includePets == nil and isPet then -- exclude pets
      return false
    end
  end

  if triggerInfo.unit == "group" and triggerInfo.groupSubType == "party" then
    if IsInRaid() then
      -- Filter our player/party# while in raid and keep only raid units that are correct
      if not Private.multiUnitUnits.raid[unit] or not UnitInSubgroupOrPlayer(unit, triggerInfo.includePets) then
        return false
      end
    else
      if not UnitInSubgroupOrPlayer(unit, triggerInfo.includePets) then
        return false
      end
    end
  end

  -- Filter our player/party# while in raid
  if (triggerInfo.unit == "group" and triggerInfo.groupSubType == "group" and IsInRaid() and not Private.multiUnitUnits.raid[unit]) then
    return false
  end

  if triggerInfo.unit == "group" and triggerInfo.groupSubType == "raid" and not Private.multiUnitUnits.raid[unit] then
    return false
  end

  if triggerInfo.class and not triggerInfo.class[select(2, UnitClass(controllingUnit))] then
    return false
  end

  if triggerInfo.npcId and select(6, strsplit('-', UnitGUID(unit) or '')) ~= triggerInfo.npcId then
    return false
  end

  if triggerInfo.nameChecker and not triggerInfo.nameChecker:Check(WeakAuras.UnitNameWithRealm(unit)) then
    return false
  end

  return true
end

local function FormatAffectedUnaffected(triggerInfo, matchedUnits)
  local affected = ""
  local unaffected = ""
  for unit in GetAllUnits(triggerInfo.unit, nil, triggerInfo.includePets) do
    if activeGroupScanFuncs[unit] and activeGroupScanFuncs[unit][triggerInfo] then
      if matchedUnits[unit] then
        affected = affected .. (GetUnitName(unit, false) or unit) .. ", "
      else
        unaffected = unaffected .. (GetUnitName(unit, false) or unit) .. ", "
      end
    end
  end
  unaffected = unaffected == "" and L["None"] or unaffected:sub(1, -3)
  affected = affected == "" and L["None"] or affected:sub(1, -3)

  return affected, unaffected
end

local recheckTriggerInfo

local function SatisfiesGroupMatchCount(triggerInfo, unitCount, maxUnitCount, matchCount)
  if triggerInfo.groupCountFunc and not triggerInfo.groupCountFunc(unitCount, maxUnitCount) then
    return false
  end

  if triggerInfo.matchCountFunc and not triggerInfo.matchCountFunc(matchCount) then
    return false
  end
  return true
end

local function SatisfiesMatchCountPerUnit(triggerInfo, countPerUnit)
  return not triggerInfo.matchPerUnitCountFunc or triggerInfo.matchPerUnitCountFunc(countPerUnit)
end

local function bestUnit(triggerInfo, bestMatch)
  if bestMatch then
    return bestMatch.unit
  elseif not triggerInfo.groupTrigger and triggerInfo.unit then
    return triggerInfo.unit
  end
end

local function roleForTriggerInfo(triggerInfo, unit)
  if triggerInfo.fetchRole then
    return UnitGroupRolesAssigned(unit)
  end
end

local function markForTriggerInfo(triggerInfo, unit)
  if triggerInfo.fetchRaidMark then
    local rt = GetRaidTargetIndex(unit)
    if rt then
      return "{rt" .. GetRaidTargetIndex(unit) .. "}"
    end
  end
end

local function SortMatchDataByUnitIndex(a, b)
  if a.unit and b.unit and a.unit ~= b.unit then
    return a.unit < b.unit
  end
  if a.index and b.index and a.index ~= b.index then
    return a.index < b.index
  end
  return a.expirationTime < b.expirationTime
end

local function UpdateTriggerState(time, id, triggernum)
  local triggerStates = WeakAuras.GetTriggerStateForTrigger(id, triggernum)
  local triggerInfo = triggerInfos[id][triggernum]
  local updated
  local nextCheck
  local matchCount = 0
  ---@type number?
  local totalStacks = 0
  local unitCount = 0
  local auraDatas = {}
  local maxUnitCount = MaxUnitCount(triggerInfo)
  local matchedUnits = {}
  local matchCountPerUnit = {}

  if triggerInfo.combineMode == "showOne" then
    local bestMatch
    bestMatch, matchCount, unitCount, totalStacks, nextCheck = FindBestMatchData(time, id, triggernum, triggerInfo, matchedUnits)
    local cloneId = ""

    local useMatch = true
    if triggerInfo.unitExists ~= nil and not existingUnits[triggerInfo.unit] then
      useMatch = triggerInfo.unitExists
    else
      useMatch = SatisfiesGroupMatchCount(triggerInfo, unitCount, maxUnitCount, matchCount)
    end

    if useMatch then
      local affected, unaffected
      if triggerInfo.useAffected then
        affected, unaffected = FormatAffectedUnaffected(triggerInfo, matchedUnits)
      end

      local unit = bestUnit(triggerInfo, bestMatch)
      local role = roleForTriggerInfo(triggerInfo, unit)
      local mark = markForTriggerInfo(triggerInfo, unit)

      if bestMatch then
        updated = UpdateStateWithMatch(time, bestMatch, triggerStates, cloneId, matchCount, unitCount, maxUnitCount, matchCount, totalStacks, affected, unaffected, role, mark)
      else
        updated = UpdateStateWithNoMatch(time, triggerStates, triggerInfo, cloneId, unit, 0, 0, maxUnitCount, 0, 0, affected, unaffected, role, mark)
      end
    else
      updated = RemoveState(triggerStates, cloneId)
    end
  elseif triggerInfo.combineMode == "showClones" then
    if matchDataByTrigger[id] and matchDataByTrigger[id][triggernum] then
      for unit, unitData in pairs(matchDataByTrigger[id][triggernum]) do
        local unitCounted = false
        for index, auraData in pairs(unitData) do
          local remCheck = true
          if triggerInfo.remainingFunc and auraData.expirationTime then
            local modRate = auraData.modRate or 1
            local remaining = (auraData.expirationTime - time) / modRate
            remCheck = triggerInfo.remainingFunc(remaining)
            nextCheck = calculateNextCheck(triggerInfo.remainingCheck, remaining, auraData.expirationTime, modRate, nextCheck)
          end

          if remCheck then
            tinsert(auraDatas, auraData)
            matchCount = matchCount + 1
            totalStacks = totalStacks + (auraData.stacks or 0)
            matchedUnits[unit] = true
            matchCountPerUnit[unit] = (matchCountPerUnit[unit] or 0) + 1
            if not unitCounted then
              unitCount = unitCount + 1
              unitCounted = true
            end
          end
        end
      end
    end

    local useMatches = true
    if triggerInfo.unitExists ~= nil and not existingUnits[triggerInfo.unit] then
      useMatches = triggerInfo.unitExists
    else
      useMatches = SatisfiesGroupMatchCount(triggerInfo, unitCount, maxUnitCount, matchCount)
    end

    local cloneIds = {}
    if useMatches then
      table.sort(auraDatas, SortMatchDataByUnitIndex)

      local affected, unaffected
      if triggerInfo.useAffected then
        affected, unaffected = FormatAffectedUnaffected(triggerInfo, matchedUnits)
      end

      local usedCloneIds = {};
      for index, auraData in ipairs(auraDatas) do
        local cloneId = (auraData.GUID or auraData.unit or "unknown") .. " " .. auraData.spellId
        if usedCloneIds[cloneId] then
          usedCloneIds[cloneId] = usedCloneIds[cloneId] + 1
          cloneId = cloneId .. usedCloneIds[cloneId]
        else
          usedCloneIds[cloneId] = 1
        end


        local role = roleForTriggerInfo(triggerInfo, auraData.unit)
        local mark = markForTriggerInfo(triggerInfo, auraData.unit)
        updated = UpdateStateWithMatch(time, auraData, triggerStates, cloneId, matchCount, unitCount, maxUnitCount,
                                      matchCountPerUnit[auraData.unit], totalStacks, affected, unaffected, role, mark) or updated
        cloneIds[cloneId] = true
      end

      if matchCount == 0 then
        local unit = bestUnit(triggerInfo, nil)
        local role = roleForTriggerInfo(triggerInfo, unit)
        local mark = markForTriggerInfo(triggerInfo, unit)
        updated = UpdateStateWithNoMatch(time, triggerStates, triggerInfo, "", nil, 0, 0, maxUnitCount, 0, totalStacks,
                                         affected, unaffected, role, mark) or updated
        cloneIds[""] = true
      end
    end

    for cloneId, state in pairs(triggerStates) do
      if not cloneIds[cloneId] then
        updated = RemoveState(triggerStates, cloneId) or updated
      end
    end
  elseif triggerInfo.combineMode == "showPerUnit" then
    local matches = {}
    if matchDataByTrigger[id] and matchDataByTrigger[id][triggernum] then
      for unit, unitData in pairs(matchDataByTrigger[id][triggernum]) do
        local bestMatch, countPerUnit, stacks, nextCheckForMatch = FindBestMatchDataForUnit(time, id, triggernum, triggerInfo, unit)

        if SatisfiesMatchCountPerUnit(triggerInfo, countPerUnit) then
          matchCount = matchCount + countPerUnit
          totalStacks = totalStacks + (stacks or 0)
          if bestMatch then
            unitCount = unitCount + 1
            matchedUnits[unit] = true
          end

          if not nextCheck then
            nextCheck = nextCheckForMatch
          elseif nextCheckForMatch then
            nextCheck = min(nextCheck, nextCheckForMatch)
          end
          matches[unit] = bestMatch
          matchCountPerUnit[unit] = countPerUnit
        end
      end
    end

    local useMatches = SatisfiesGroupMatchCount(triggerInfo, unitCount, maxUnitCount, matchCount)

    local cloneIds = {}
    if useMatches then
      local affected, unaffected
      if triggerInfo.useAffected then
        affected, unaffected = FormatAffectedUnaffected(triggerInfo, matchedUnits)
      end

      if triggerInfo.perUnitMode == "affected" then
        for unit, bestMatch in pairs(matches) do
          if bestMatch then
            local role = roleForTriggerInfo(triggerInfo, unit)
            local mark = markForTriggerInfo(triggerInfo, unit)
            updated = UpdateStateWithMatch(time, bestMatch, triggerStates, unit, matchCount, unitCount, maxUnitCount,
                                           matchCountPerUnit[unit], totalStacks, affected, unaffected, role, mark)
                                           or updated
            cloneIds[unit] = true
          end
        end
      else
        -- state per unaffected unit
        for unit in GetAllUnits(triggerInfo.unit, nil, triggerInfo.includePets) do
          if activeGroupScanFuncs[unit] and activeGroupScanFuncs[unit][triggerInfo] then
            local bestMatch = matches[unit]
            local role = roleForTriggerInfo(triggerInfo, unit)
            local mark = markForTriggerInfo(triggerInfo, unit)
            if bestMatch then
              if triggerInfo.perUnitMode == "all" then
                updated = UpdateStateWithMatch(time, bestMatch, triggerStates, unit, matchCount, unitCount, maxUnitCount,
                                               matchCountPerUnit[unit], totalStacks, affected, unaffected, role, mark)
                                               or updated
                cloneIds[unit] = true
              end
            else
              updated = UpdateStateWithNoMatch(time, triggerStates, triggerInfo, unit, unit, matchCount,
                                               unitCount, maxUnitCount, matchCountPerUnit[unit], totalStacks,
                                              affected, unaffected, role)
                                              or updated
              cloneIds[unit] = true
            end
          end
        end
      end
    end

    for cloneId, state in pairs(triggerStates) do
      if not cloneIds[cloneId] then
        updated = RemoveState(triggerStates, cloneId) or updated
      end
    end
  end

  if nextCheck then
    if triggerInfo.nextScheduledCheck ~= nextCheck then
      if triggerInfo.nextScheduledCheckHandle then
        timer:CancelTimer(triggerInfo.nextScheduledCheckHandle)
      end
      triggerInfo.nextScheduledCheckHandle = timer:ScheduleTimerFixed(recheckTriggerInfo, nextCheck - time, triggerInfo)
      triggerInfo.nextScheduledCheck = nextCheck
    end
  elseif triggerInfo.nextScheduledCheckHandle then
    timer:CancelTimer(triggerInfo.nextScheduledCheckHandle)
    triggerInfo.nextScheduledCheckHandle = nil
    triggerInfo.nextScheduledCheck = nil
  end

  -- if the trigger has updated then check to see if it is flagged for WatchedTrigger and send to queue if it is
  if updated then
    if watched_trigger_events[id] and watched_trigger_events[id][triggernum] then
      Private.AddToWatchedTriggerDelay(id, triggernum)
    end
  end
  return updated
end

recheckTriggerInfo = function(triggerInfo)
  matchDataChanged[triggerInfo.id] = matchDataChanged[triggerInfo.id] or {}
  matchDataChanged[triggerInfo.id][triggerInfo.triggernum] = true
  triggerInfo.nextScheduledCheckHandle = nil
  triggerInfo.nextScheduledCheck = nil
end

local PrepareMatchData
do
  local _time, _unit, _filter

  local function HandleAura(aura)
    if (not aura or not aura.name) then
      return
    end
    local debuffClass = aura.dispelName
    if debuffClass == nil then
      debuffClass = "none"
    elseif debuffClass == "" then
      debuffClass = "enrage"
    else
      debuffClass = string.lower(debuffClass)
    end
    UpdateMatchData(_time, matchDataChanged, _unit, nil, aura.auraInstanceID, _filter, aura.name, aura.icon, aura.applications, debuffClass, aura.duration, aura.expirationTime, aura.sourceUnit, aura.isStealable, aura.isBossAura, aura.isFromPlayerOrPlayerPet, aura.spellId, aura.timeMod, aura.points)
  end

  PrepareMatchData = function(unit, filter)
    if not matchDataUpToDate[unit] or not matchDataUpToDate[unit][filter] then
      if newAPI then
        _time = GetTime()
        _unit = unit
        _filter = filter
        AuraUtil.ForEachAura(unit, filter, nil, HandleAura, true)
      else
        local time = GetTime()
        local index = 1
        while true do
          local name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, isBossDebuff, isCastByPlayer, _, modRate = UnitAura(unit, index, filter)
          if not name then
            break
          end

          if debuffClass == nil then
            debuffClass = "none"
          elseif debuffClass == "" then
            debuffClass = "enrage"
          else
            debuffClass = string.lower(debuffClass)
          end

          UpdateMatchData(time, matchDataChanged, unit, index, nil, filter, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, isBossDebuff, isCastByPlayer, spellId, modRate, nil)
          index = index + 1
        end
      end
      matchDataUpToDate[unit] = matchDataUpToDate[unit] or {}
      matchDataUpToDate[unit][filter] = true
    end
  end
end

local function CleanUpOutdatedMatchData(removeIndex, unit, filter)
  -- Figure out if any matchData is outdated
  if newAPI then
    -- clean everything, as ScanUnitWithFilter is only used with index = 1 to wipe all data with newAPI
    if matchData[unit] and matchData[unit][filter] then
      for auraInstanceID, data in pairs(matchData[unit][filter]) do
        for id, triggerData in pairs(data.auras) do
          for triggernum in pairs(triggerData) do
            matchDataByTrigger[id][triggernum][unit][auraInstanceID] = nil
            matchDataChanged[id] = matchDataChanged[id] or {}
            matchDataChanged[id][triggernum] = true
          end
        end
        matchData[unit][filter][auraInstanceID] = nil
      end
    end
  else
    if matchData[unit] and matchData[unit][filter] then
      for index = removeIndex, #matchData[unit][filter] do
        local data = matchData[unit][filter][index]
        if (data and data.index >= removeIndex) or not UnitExistsFixed(unit) then
           matchData[unit][filter][index] = nil
           for id, triggerData in pairs(data.auras) do
             for triggernum in pairs(triggerData) do
               matchDataByTrigger[id][triggernum][unit][index] = nil
               matchDataChanged[id] = matchDataChanged[id] or {}
               matchDataChanged[id][triggernum] = true
             end
           end
        end
      end
    end
  end
end

local function CleanUpMatchDataForUnit(unit, filter)
  -- Figure out if any matchData is outdated
  if matchData[unit] and matchData[unit][filter] then
    for index, data in pairs(matchData[unit][filter]) do
      matchData[unit][filter][index] = nil
      for id, triggerData in pairs(data.auras) do
        for triggernum in pairs(triggerData) do
          if matchDataByTrigger[id] and matchDataByTrigger[id][triggernum]
             and matchDataByTrigger[id][triggernum][unit]
             and matchDataByTrigger[id][triggernum][unit][index]
          then
            matchDataByTrigger[id][triggernum][unit][index] = nil
            matchDataChanged[id] = matchDataChanged[id] or {}
            matchDataChanged[id][triggernum] = true
          end
        end
      end
    end
  end
end

local function DeactivateScanFuncs(toDeactivate)
  for unit, triggerInfosPerUnit in pairs(toDeactivate) do
    for triggerInfo in pairs(triggerInfosPerUnit) do
      local id = triggerInfo.id
      local triggernum = triggerInfo.triggernum
      local matches = GetSubTable(matchDataByTrigger, id, triggernum, unit)
      if (matches) then
        for index, match in pairs(matches) do
          match.auras[id][triggernum] = nil
        end
        matchDataByTrigger[id][triggernum][unit] = nil
        matchDataChanged[id] = matchDataChanged[id] or {}
        matchDataChanged[id][triggernum] = true
      end
    end
  end
end

local function CheckScanFuncs(scanFuncs, unit, filter, key)
  if scanFuncs then
    for triggerInfo in pairs(scanFuncs) do
      if triggerInfo.fetchTooltip then
        matchData[unit][filter][key]:UpdateTooltip(GetTime())
      end
      if not triggerInfo.scanFunc or triggerInfo.scanFunc(time, matchData[unit][filter][key]) then
        local id = triggerInfo.id
        local triggernum = triggerInfo.triggernum
        ReferenceMatchData(id, triggernum, unit, filter, key)
        matchDataChanged[id] = matchDataChanged[id] or {}
        matchDataChanged[id][triggernum] = true
      end
    end
  end
end

local ScanUnitWithFilter
do
  local _matchDataChanged, _time, _unit, _filter, _scanFuncNameGroup, _scanFuncSpellIdGroup, _scanFuncGeneralGroup, _scanFuncName, _scanFuncSpellId, _scanFuncGeneral

  local function HandleAura(aura)
    if (not aura or not aura.name) then
      return
    end
    local debuffClass = aura.dispelName
    if debuffClass == nil then
      debuffClass = "none"
    elseif debuffClass == "" then
      debuffClass = "enrage"
    else
      debuffClass = string.lower(debuffClass)
    end

    local name, spellId, auraInstanceID = aura.name, aura.spellId, aura.auraInstanceID
    local updatedMatchData = UpdateMatchData(_time, _matchDataChanged, _unit, nil, auraInstanceID, _filter, name, aura.icon, aura.applications, debuffClass, aura.duration, aura.expirationTime, aura.sourceUnit, aura.isStealable, aura.isBossAura, aura.isFromPlayerOrPlayerPet, spellId, aura.timeMod, aura.points)

    if updatedMatchData then -- Aura data changed, check against triggerInfos
      CheckScanFuncs(_scanFuncName and _scanFuncName[name], _unit, _filter, auraInstanceID)
      CheckScanFuncs(_scanFuncNameGroup and _scanFuncNameGroup[name], _unit, _filter, auraInstanceID)
      CheckScanFuncs(_scanFuncSpellId and _scanFuncSpellId[spellId], _unit, _filter, auraInstanceID)
      CheckScanFuncs(_scanFuncSpellIdGroup and _scanFuncSpellIdGroup[spellId], _unit, _filter, auraInstanceID)
      CheckScanFuncs(_scanFuncGeneral, _unit, _filter, auraInstanceID)
      CheckScanFuncs(_scanFuncGeneralGroup, _unit, _filter, auraInstanceID)
    end
  end

  ScanUnitWithFilter = function(matchDataChanged, time, unit, filter, unitAuraUpdateInfo,
    scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup,
    scanFuncName, scanFuncSpellId, scanFuncGeneral)
    if not scanFuncName and not scanFuncSpellId and not scanFuncGeneral and not scanFuncNameGroup and not scanFuncSpellIdGroup and not scanFuncGeneralGroup then
      if matchDataUpToDate[unit] then
        matchDataUpToDate[unit][filter] = nil
      end
      CleanUpOutdatedMatchData(1, unit, filter)
      return
    end

    if UnitExistsFixed(unit) then
      if newAPI then
        -- copy parameters passed to ScanUnitWithFilter in parent's scope for HandleAura
        _matchDataChanged, _time, _unit, _filter, _scanFuncNameGroup, _scanFuncSpellIdGroup, _scanFuncGeneralGroup, _scanFuncName, _scanFuncSpellId, _scanFuncGeneral = matchDataChanged, time, unit, filter, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup, scanFuncName, scanFuncSpellId, scanFuncGeneral
        if unitAuraUpdateInfo then
          -- incremental
          if unitAuraUpdateInfo.addedAuras ~= nil then
            for _, aura in ipairs(unitAuraUpdateInfo.addedAuras) do
              if (aura.isHelpful and filter == "HELPFUL") or (aura.isHarmful and filter == "HARMFUL") then
                HandleAura(aura)
              end
            end
          end

          if unitAuraUpdateInfo.updatedAuraInstanceIDs ~= nil then
            for _, auraInstanceID in ipairs(unitAuraUpdateInfo.updatedAuraInstanceIDs) do
              local aura = C_UnitAuras.GetAuraDataByAuraInstanceID(unit, auraInstanceID)
              if aura and ((aura.isHelpful and filter == "HELPFUL") or (aura.isHarmful and filter == "HARMFUL")) then
                HandleAura(aura)
              end
            end
          end

          if unitAuraUpdateInfo.removedAuraInstanceIDs ~= nil then
            for _, auraInstanceID in ipairs(unitAuraUpdateInfo.removedAuraInstanceIDs) do
              if matchData[unit] and matchData[unit][filter] then
                local data = matchData[unit][filter][auraInstanceID]
                if data then
                  matchData[unit][filter][auraInstanceID] = nil
                  for id, triggerData in pairs(data.auras) do
                    for triggernum in pairs(triggerData) do
                      matchDataByTrigger[id][triggernum][unit][auraInstanceID] = nil
                      matchDataChanged[id] = matchDataChanged[id] or {}
                      matchDataChanged[id][triggernum] = true
                    end
                  end
                end
              end
            end
          end
        else
          -- full
          -- clean first
          CleanUpOutdatedMatchData(nil, unit, filter)
          AuraUtil.ForEachAura(unit, filter, nil, HandleAura, true)
        end
      else
        local index = 1
        while true do
          local name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, isBossDebuff, isCastByPlayer, _, modRate = UnitAura(unit, index, filter)
          if not name then
            break
          end

          if debuffClass == nil then
            debuffClass = "none"
          elseif debuffClass == "" then
            debuffClass = "enrage"
          else
            debuffClass = string.lower(debuffClass)
          end

          local updatedMatchData = UpdateMatchData(time, matchDataChanged, unit, index, nil, filter, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, isBossDebuff, isCastByPlayer, spellId, modRate, nil)

          if updatedMatchData then -- Aura data changed, check against triggerInfos
            CheckScanFuncs(scanFuncName and scanFuncName[name], unit, filter, index)
            CheckScanFuncs(scanFuncNameGroup and scanFuncNameGroup[name], unit, filter, index)
            CheckScanFuncs(scanFuncSpellId and scanFuncSpellId[spellId], unit, filter, index)
            CheckScanFuncs(scanFuncSpellIdGroup and scanFuncSpellIdGroup[spellId], unit, filter, index)
            CheckScanFuncs(scanFuncGeneral, unit, filter, index)
            CheckScanFuncs(scanFuncGeneralGroup, unit, filter, index)
          end
          index = index + 1
        end

        CleanUpOutdatedMatchData(index, unit, filter)
      end
    end

    matchDataUpToDate[unit] = matchDataUpToDate[unit] or {}
    matchDataUpToDate[unit][filter] = true
  end
end

local function UpdateStates(matchDataChanged, time)
  for id, auraData in pairs(matchDataChanged) do
    Private.StartProfileAura(id)
    local updated = false
    for triggernum in pairs(auraData) do
      updated = UpdateTriggerState(time, id, triggernum) or updated
    end
    if updated then
      Private.UpdatedTriggerState(id)
    end
    Private.StopProfileAura(id)
  end
end

local function ScanGroupRoleScanFunc(matchDataChanged)
  for id, idData in pairs(groupRoleScanFunc) do
    matchDataChanged[id] = matchDataChanged[id] or {}
    for _, triggerInfo in ipairs(idData) do
      matchDataChanged[id][triggerInfo.triggernum] = true
    end
  end
end

local function ScanRaidMarkScanFunc(matchDataChanged)
  for id, idData in pairs(raidMarkScanFuncs) do
    matchDataChanged[id] = matchDataChanged[id] or {}
    for _, triggerInfo in ipairs(idData) do
      matchDataChanged[id][triggerInfo.triggernum] = true
    end
  end
end

local function ScanGroupUnit(time, matchDataChanged, unitType, unit, unitAuraUpdateInfo)
  local unitExists = UnitExistsFixed(unit)
  if existingUnits[unit] ~= unitExists then
    existingUnits[unit] = unitExists

    if unitExistScanFunc[unit] then
      for id, idData in pairs(unitExistScanFunc[unit]) do
        matchDataChanged[id] = matchDataChanged[id] or {}
        for _, triggerInfo in ipairs(idData) do
          matchDataChanged[id][triggerInfo.triggernum] = true
        end
      end
    end
  end

  scanFuncName[unit] = scanFuncName[unit] or {}
  scanFuncSpellId[unit] = scanFuncSpellId[unit] or {}
  scanFuncGeneral[unit] = scanFuncGeneral[unit] or {}
  if unitType then
    scanFuncNameGroup[unit] = scanFuncNameGroup[unit] or {}
    scanFuncSpellIdGroup[unit] = scanFuncSpellIdGroup[unit] or {}
    scanFuncGeneralGroup[unit] = scanFuncGeneralGroup[unit] or {}

    ScanUnitWithFilter(matchDataChanged, time, unit, "HELPFUL", unitAuraUpdateInfo,
      scanFuncNameGroup[unit]["HELPFUL"],
      scanFuncSpellIdGroup[unit]["HELPFUL"],
      scanFuncGeneralGroup[unit]["HELPFUL"],
      scanFuncName[unit]["HELPFUL"],
      scanFuncSpellId[unit]["HELPFUL"],
      scanFuncGeneral[unit]["HELPFUL"])

    ScanUnitWithFilter(matchDataChanged, time, unit, "HARMFUL", unitAuraUpdateInfo,
      scanFuncNameGroup[unit]["HARMFUL"],
      scanFuncSpellIdGroup[unit]["HARMFUL"],
      scanFuncGeneralGroup[unit]["HARMFUL"],
      scanFuncName[unit]["HARMFUL"],
      scanFuncSpellId[unit]["HARMFUL"],
      scanFuncGeneral[unit]["HARMFUL"])
  else
    ScanUnitWithFilter(matchDataChanged, time, unit, "HELPFUL", unitAuraUpdateInfo, nil, nil, nil,
      scanFuncName[unit]["HELPFUL"],
      scanFuncSpellId[unit]["HELPFUL"],
      scanFuncGeneral[unit]["HELPFUL"])

    ScanUnitWithFilter(matchDataChanged, time, unit, "HARMFUL", unitAuraUpdateInfo, nil, nil, nil,
      scanFuncName[unit]["HARMFUL"],
      scanFuncSpellId[unit]["HARMFUL"],
      scanFuncGeneral[unit]["HARMFUL"])
  end
end

local function ScanUnit(time, unit, unitAuraUpdateInfo)
  if (Private.multiUnitUnits.raid[unit] and IsInRaid()) then
    ScanGroupUnit(time, matchDataChanged, "group", unit, unitAuraUpdateInfo)
  elseif (Private.multiUnitUnits.party[unit] and not IsInRaid()) then
    ScanGroupUnit(time, matchDataChanged, "group", unit, unitAuraUpdateInfo)
  elseif Private.multiUnitUnits.boss[unit] then
    ScanGroupUnit(time, matchDataChanged, "boss", unit, unitAuraUpdateInfo)
  elseif Private.multiUnitUnits.arena[unit] then
    ScanGroupUnit(time, matchDataChanged, "arena", unit, unitAuraUpdateInfo)
  elseif unit:sub(1, 9) == "nameplate" then
    ScanGroupUnit(time, matchDataChanged, "nameplate", unit, unitAuraUpdateInfo)
  else
    ScanGroupUnit(time, matchDataChanged, nil, unit, unitAuraUpdateInfo)
  end
end

local function AddScanFuncs(triggerInfo, filter, unit, scanFuncName, scanFuncSpellId, scanFuncGeneral)
  if triggerInfo.auranames then
    for _, name in ipairs(triggerInfo.auranames) do
      if name ~= "" then
        local base = unit and GetOrCreateSubTable(scanFuncName, unit, filter, name) or GetOrCreateSubTable(scanFuncName, filter, name)
        base[triggerInfo] = true
      end
    end
  end

  if triggerInfo.auraspellids then
    for _, spellId in ipairs(triggerInfo.auraspellids) do
      local base = unit and GetOrCreateSubTable(scanFuncSpellId, unit, filter, spellId) or GetOrCreateSubTable(scanFuncSpellId, filter, spellId)
      base[triggerInfo] = true
    end
  end

  if not triggerInfo.auranames and not triggerInfo.auraspellids and scanFuncGeneral then
    local base = GetOrCreateSubTable(scanFuncGeneral, unit, filter)
    base[triggerInfo] = true
  end

  if unit then
    PrepareMatchData(unit, filter)
    ScanMatchData(GetTime(), triggerInfo, unit, filter)
  end
end

local function RemoveScanFuncs(triggerInfo, filter, unit, scanFuncName, scanFuncSpellId, scanFuncGeneral)
  if triggerInfo.auranames then
    for _, name in ipairs(triggerInfo.auranames) do
      if name ~= "" then
        local base = unit and GetSubTable(scanFuncName, unit, filter, name) or GetSubTable(scanFuncName, filter, name)
        if base then
          base[triggerInfo] = nil
        end
      end
    end
  end

  if triggerInfo.auraspellids then
    for _, spellId in ipairs(triggerInfo.auraspellids) do
      local base = unit and GetSubTable(scanFuncSpellId, unit, filter, spellId) or GetSubTable(scanFuncSpellId, filter, spellId)
      if base then
        base[triggerInfo] = nil
      end
    end
  end

  if not triggerInfo.auranames and not triggerInfo.auraspellids and scanFuncGeneral then
    local base = GetSubTable(scanFuncGeneral, unit, filter)
    if base then
      base[triggerInfo] = nil
    end
  end
end

local function RecheckActive(triggerInfo, unit, unitsToRemoveScan)
  local isSelf, role, inParty, class
  local unitExists = UnitExistsFixed(unit)
  if unitExists and TriggerInfoApplies(triggerInfo, unit) then
    if (not activeGroupScanFuncs[unit] or not activeGroupScanFuncs[unit][triggerInfo]) then
      triggerInfo.maxUnitCount = triggerInfo.maxUnitCount + 1
      if triggerInfo.debuffType == "BOTH" then
        AddScanFuncs(triggerInfo, "HELPFUL", unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
        AddScanFuncs(triggerInfo, "HARMFUL", unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
      else
        AddScanFuncs(triggerInfo, triggerInfo.debuffType, unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
      end

      activeGroupScanFuncs[unit] = activeGroupScanFuncs[unit] or {}
      activeGroupScanFuncs[unit][triggerInfo] = true
      matchDataChanged[triggerInfo.id] = matchDataChanged[triggerInfo.id] or {}
      matchDataChanged[triggerInfo.id][triggerInfo.triggernum] = true
    end
  else
    -- Either the unit doesn't exist or the TriggerInfo no longer applies
    if activeGroupScanFuncs[unit] and activeGroupScanFuncs[unit][triggerInfo] then
      triggerInfo.maxUnitCount = triggerInfo.maxUnitCount - 1
      if triggerInfo.debuffType == "BOTH" then
        RemoveScanFuncs(triggerInfo, "HELPFUL", unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
        RemoveScanFuncs(triggerInfo, "HARMFUL", unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
      else
        RemoveScanFuncs(triggerInfo, triggerInfo.debuffType, unit, scanFuncNameGroup, scanFuncSpellIdGroup, scanFuncGeneralGroup)
      end
      if unitsToRemoveScan then
        unitsToRemoveScan[unit] = unitsToRemoveScan[unit] or {}
        unitsToRemoveScan[unit][triggerInfo] = true
      end
      activeGroupScanFuncs[unit][triggerInfo] = nil
      matchDataChanged[triggerInfo.id] = matchDataChanged[triggerInfo.id] or {}
      matchDataChanged[triggerInfo.id][triggerInfo.triggernum] = true
    end
  end
end

local function RecheckActiveForUnitType(unitType, unit, unitsToRemoveScan)
  if groupScanFuncs[unitType] then
    for i, triggerInfo in ipairs(groupScanFuncs[unitType]) do
      RecheckActive(triggerInfo, unit, unitsToRemoveScan)
    end
  end
end

local Buff2Frame = CreateFrame("Frame")
Private.frames["WeakAuras Buff2 Frame"] = Buff2Frame


local function EventHandler(frame, event, arg1, arg2, ...)
  Private.StartProfileSystem("bufftrigger2")

  local deactivatedTriggerInfos = {}
  local unitsToRemove = {}

  local time = GetTime()
  local targetUnit = Private.player_target_events[event]
  if targetUnit then
    ScanGroupUnit(time, matchDataChanged, nil, targetUnit)
    if not UnitExistsFixed(targetUnit) then
      tinsert(unitsToRemove, targetUnit)
    end
  elseif event == "UNIT_PET" then
    local pet = WeakAuras.unitToPetUnit[arg1]
    if pet then
      ScanGroupUnit(time, matchDataChanged, "group", pet)
      RecheckActiveForUnitType("group", pet, deactivatedTriggerInfos)
      if not UnitExistsFixed(pet) then
        tinsert(unitsToRemove, pet)
      end
    end
  elseif event == "NAME_PLATE_UNIT_ADDED" then
    nameplateExists[arg1] = true
    RecheckActiveForUnitType("nameplate", arg1, deactivatedTriggerInfos)
  elseif event == "NAME_PLATE_UNIT_REMOVED" then
    nameplateExists[arg1] = false
    RecheckActiveForUnitType("nameplate", arg1, deactivatedTriggerInfos)
    tinsert(unitsToRemove, arg1)
  elseif event == "UNIT_FACTION" then
    if arg1:sub(1, 9) == "nameplate" then
      RecheckActiveForUnitType("nameplate", arg1, deactivatedTriggerInfos)
    end
  elseif event == "ENCOUNTER_START" or event == "ENCOUNTER_END" or event == "INSTANCE_ENCOUNTER_ENGAGE_UNIT" then
    for unit in GetAllUnits("boss", true) do
      RecheckActiveForUnitType("boss", unit, deactivatedTriggerInfos)
      if not UnitExistsFixed(unit) then
        tinsert(unitsToRemove, unit)
      else
        if newAPI then
          ScanUnit(time, unit)
        end
      end
    end
  elseif event =="ARENA_OPPONENT_UPDATE" then
    for unit in GetAllUnits("arena", true) do
      RecheckActiveForUnitType("arena", unit, deactivatedTriggerInfos)
      if not UnitExistsFixed(unit) then
        tinsert(unitsToRemove, unit)
      end
    end
  elseif event == "GROUP_ROSTER_UPDATE" then
    unitVisible = {}
    for unit in GetAllUnits("group", true, "PlayersAndPets") do
      RecheckActiveForUnitType("group", unit, deactivatedTriggerInfos)
      if not UnitExistsFixed(unit) then
        tinsert(unitsToRemove, unit)
      end
    end
    ScanGroupRoleScanFunc(matchDataChanged)
  elseif event == "UNIT_FLAGS" or event == "UNIT_NAME_UPDATE" or event == "PLAYER_FLAGS_CHANGED"
      or event == "PARTY_MEMBER_ENABLE" or event == "PARTY_MEMBER_DISABLE"
  then
    if event == "PARTY_MEMBER_ENABLE" then
      unitVisible[arg1] = true
    elseif event == "PARTY_MEMBER_DISABLE" then
      unitVisible[arg1] = false
    end
    if Private.multiUnitUnits.group[arg1] then
      RecheckActiveForUnitType("group", arg1, deactivatedTriggerInfos)
    end
  elseif event == "UNIT_ENTERED_VEHICLE" or event == "UNIT_EXITED_VEHICLE" then
    if arg1 == "player" then
      ScanGroupUnit(time, matchDataChanged, nil, "vehicle")
    end
  elseif event == "UNIT_AURA" then
    if newAPI then
      -- arg1: unit
      -- arg2: unitAuraUpdateInfo
      if arg2 == nil or arg2.isFullUpdate then
        ScanUnit(time, arg1)
      else
        ScanUnit(time, arg1, arg2)
      end
    else
      ScanUnit(time, arg1)
    end
  elseif event == "PLAYER_ENTERING_WORLD" then
    for unit in pairs(matchData) do
      ScanUnit(time, unit)
      if not UnitExistsFixed(unit) then
        tinsert(unitsToRemove, unit)
      end
    end
  elseif event == "RAID_TARGET_UPDATE" then
    ScanRaidMarkScanFunc(matchDataChanged)
  end

  DeactivateScanFuncs(deactivatedTriggerInfos)

  for i, unit in ipairs(unitsToRemove) do
    CleanUpMatchDataForUnit(unit, "HELPFUL")
    CleanUpMatchDataForUnit(unit, "HARMFUL")
    matchDataUpToDate[unit] = nil
  end

  Private.StopProfileSystem("bufftrigger2")
end

if WeakAuras.IsRetail() then
  Private.LibSpecWrapper.Register(function(unit)
    Private.StartProfileSystem("bufftrigger2")

    local deactivatedTriggerInfos = {}
    RecheckActiveForUnitType("group", unit, deactivatedTriggerInfos)
    RecheckActiveForUnitType("group", WeakAuras.unitToPetUnit[unit], deactivatedTriggerInfos)
    DeactivateScanFuncs(deactivatedTriggerInfos)

    Private.StopProfileSystem("bufftrigger2")
  end)
end

Buff2Frame:RegisterEvent("UNIT_AURA")
Buff2Frame:RegisterEvent("UNIT_FACTION")
Buff2Frame:RegisterEvent("UNIT_NAME_UPDATE")
Buff2Frame:RegisterEvent("UNIT_FLAGS")
Buff2Frame:RegisterEvent("PLAYER_FLAGS_CHANGED")
Buff2Frame:RegisterEvent("UNIT_PET")
Buff2Frame:RegisterEvent("RAID_TARGET_UPDATE")
if not WeakAuras.IsClassicEra() then
  Buff2Frame:RegisterEvent("PLAYER_FOCUS_CHANGED")
  if WeakAuras.IsWrathOrRetail() then
    Buff2Frame:RegisterEvent("PLAYER_SOFT_ENEMY_CHANGED")
    Buff2Frame:RegisterEvent("PLAYER_SOFT_FRIEND_CHANGED")
    Buff2Frame:RegisterEvent("ARENA_OPPONENT_UPDATE")
  end
  Buff2Frame:RegisterEvent("UNIT_ENTERED_VEHICLE")
  Buff2Frame:RegisterEvent("UNIT_EXITED_VEHICLE")
else
  LCD.RegisterCallback("WeakAuras", "UNIT_BUFF", function(event, unit)
    EventHandler(Buff2Frame, "UNIT_AURA", unit)
  end)
end
Buff2Frame:RegisterEvent("PLAYER_TARGET_CHANGED")
Buff2Frame:RegisterEvent("ENCOUNTER_START")
Buff2Frame:RegisterEvent("ENCOUNTER_END")
Buff2Frame:RegisterEvent("INSTANCE_ENCOUNTER_ENGAGE_UNIT")
Buff2Frame:RegisterEvent("NAME_PLATE_UNIT_ADDED")
Buff2Frame:RegisterEvent("NAME_PLATE_UNIT_REMOVED")
Buff2Frame:RegisterEvent("GROUP_ROSTER_UPDATE")
Buff2Frame:RegisterEvent("PLAYER_ENTERING_WORLD")
Buff2Frame:RegisterEvent("PARTY_MEMBER_DISABLE")
Buff2Frame:RegisterEvent("PARTY_MEMBER_ENABLE")
Buff2Frame:SetScript("OnEvent", EventHandler)

Buff2Frame:SetScript("OnUpdate", function()
  if WeakAuras.IsPaused() then
    return
  end
  Private.StartProfileSystem("bufftrigger2")
  if next(matchDataChanged) then
    local time = GetTime()
    UpdateStates(matchDataChanged, time)
    wipe(matchDataChanged)
  end
  Private.StopProfileSystem("bufftrigger2")
end)

local function UnloadAura(scanFuncName, id)
  for unit, unitData in pairs(scanFuncName) do
    for debuffType, debuffData in pairs(unitData) do
      for name, nameData in pairs(debuffData) do
        for triggerInfo in pairs(nameData) do
          if triggerInfo.id == id or not id then
            if triggerInfo.nextScheduledCheckHandle then
              timer:CancelTimer(triggerInfo.nextScheduledCheckHandle)
            end
            nameData[triggerInfo] = nil
          end
        end
        if not next(nameData) then
          debuffData[name] = nil
        end
      end

      if not next(debuffData) then
        unitData[debuffType] = nil
      end
    end
    if not next(unitData) then
      scanFuncName[unit] = nil
    end
  end
end

local function UnloadGeneral(scanFuncGeneral, id)
  for unit, unitData in pairs(scanFuncGeneral) do
    for debuffType, debuffData in pairs(unitData) do
      for triggerInfo in pairs(debuffData) do
        if triggerInfo.id == id or not id then
          if triggerInfo.nextScheduledCheckHandle then
            timer:CancelTimer(triggerInfo.nextScheduledCheckHandle)
          end
          debuffData[triggerInfo] = nil
        end
      end
      if not next(debuffData) then
        unitData[debuffType] = nil
      end
    end
    if not next(unitData) then
      scanFuncGeneral[unit] = nil
    end
  end
end

function BuffTrigger.UnloadAll()
  UnloadAura(scanFuncName, nil)
  UnloadAura(scanFuncSpellId, nil)
  UnloadGeneral(scanFuncGeneral, nil)

  for unit, unitData in pairs(matchData) do
    for filter, filterData in pairs(unitData) do
      for index, indexData in pairs(filterData) do
        wipe(indexData.auras)
      end
    end
  end

  wipe(scanFuncName)
  wipe(scanFuncSpellId)
  wipe(scanFuncGeneral)
  wipe(scanFuncNameGroup)
  wipe(scanFuncSpellIdGroup)
  wipe(scanFuncGeneralGroup)
  wipe(scanFuncNameMulti)
  wipe(scanFuncSpellIdMulti)
  wipe(unitExistScanFunc)
  wipe(groupRoleScanFunc)
  wipe(groupScanFuncs)
  wipe(raidMarkScanFuncs)
  wipe(matchDataByTrigger)
  wipe(matchDataMulti)
  wipe(matchDataChanged)
  wipe(activeGroupScanFuncs)
end


local function LoadAura(id, triggernum, triggerInfo)
  if not triggerInfo.unit then
    return
  end
  local time = GetTime();

  local unitsToCheck = {}

  if triggerInfo.unit == "multi" then
    if triggerInfo.debuffType == "BOTH" then
      AddScanFuncs(triggerInfo, "HELPFUL", nil, scanFuncNameMulti, scanFuncSpellIdMulti, nil)
      AddScanFuncs(triggerInfo, "HARMFUL", nil, scanFuncNameMulti, scanFuncSpellIdMulti, nil)
    else
      AddScanFuncs(triggerInfo, triggerInfo.debuffType, nil, scanFuncNameMulti, scanFuncSpellIdMulti, nil)
    end
  elseif triggerInfo.groupTrigger then
    triggerInfo.maxUnitCount = 0
    for unit in GetAllUnits(triggerInfo.unit, nil, triggerInfo.includePets) do
      RecheckActive(triggerInfo, unit, unitsToCheck)
    end
  else
    if triggerInfo.debuffType == "BOTH" then
      AddScanFuncs(triggerInfo, "HELPFUL", triggerInfo.unit, scanFuncName, scanFuncSpellId, scanFuncGeneral)
      AddScanFuncs(triggerInfo, "HARMFUL", triggerInfo.unit, scanFuncName, scanFuncSpellId, scanFuncGeneral)
    else
      AddScanFuncs(triggerInfo, triggerInfo.debuffType, triggerInfo.unit, scanFuncName, scanFuncSpellId, scanFuncGeneral)
    end
    unitsToCheck[triggerInfo.unit] = true
  end

  if triggerInfo.unitExists ~= nil then
    unitExistScanFunc[triggerInfo.unit] = unitExistScanFunc[triggerInfo.unit] or {}
    unitExistScanFunc[triggerInfo.unit][id] = unitExistScanFunc[triggerInfo.unit][id] or {}
    tinsert(unitExistScanFunc[triggerInfo.unit][id], triggerInfo)

    if existingUnits[triggerInfo.unit] == nil then
      existingUnits[triggerInfo.unit] = UnitExistsFixed(triggerInfo.unit)
    end
  end

  if triggerInfo.fetchRole then
    groupRoleScanFunc[id] = groupRoleScanFunc[id] or {}
    tinsert(groupRoleScanFunc[id], triggerInfo)
  end

  if triggerInfo.fetchRaidMark then
    raidMarkScanFuncs[id] = raidMarkScanFuncs[id]  or {}
    tinsert(raidMarkScanFuncs[id], triggerInfo)
  end

  if triggerInfo.groupTrigger then
    groupScanFuncs[triggerInfo.unit] = groupScanFuncs[triggerInfo.unit] or {}
    tinsert(groupScanFuncs[triggerInfo.unit], triggerInfo)
  end

  matchDataChanged[id] = matchDataChanged[id] or {}
  matchDataChanged[id][triggernum] = true
end

function BuffTrigger.LoadDisplays(toLoad)
  for id in pairs(toLoad) do
    if triggerInfos[id] then
      for triggernum, triggerInfo in pairs(triggerInfos[id]) do
        LoadAura(id, triggernum, triggerInfo)
      end
    end
  end
end


function BuffTrigger.UnloadDisplays(toUnload)
  local updateGroupScanFuncs = false
  for id in pairs(toUnload) do
    UnloadAura(scanFuncName, id)
    UnloadAura(scanFuncSpellId, id)
    UnloadGeneral(scanFuncGeneral, id)

    UnloadAura(scanFuncNameGroup, id)
    UnloadAura(scanFuncSpellIdGroup, id)
    UnloadGeneral(scanFuncGeneralGroup, id)

    UnloadGeneral(scanFuncNameMulti, id)
    UnloadGeneral(scanFuncSpellIdMulti, id)

    for unit, unitData in pairs(unitExistScanFunc) do
      unitData[id] = nil
    end

    groupRoleScanFunc[id] = nil
    raidMarkScanFuncs[id] = nil

    for unit, unitData in pairs(matchData) do
      for filter, filterData in pairs(unitData) do
        for index, indexData in pairs(filterData) do
          indexData.auras[id] = nil
        end
      end
    end
    matchDataByTrigger[id] = nil

    for guid, guidData in pairs(matchDataMulti) do
      for key, data in pairs(matchDataMulti[guid]) do
        for source, sourceData in pairs(data) do
          sourceData.auras[id] = nil
        end
      end
    end
    matchDataChanged[id] = nil
  end


  for unitType, funcs in pairs(groupScanFuncs) do
    for i = #funcs, 1, -1 do
      if toUnload[funcs[i].id] then
        tremove(funcs, i)
      end
    end
  end

  for unit, unitData in pairs(activeGroupScanFuncs) do
    for triggerInfo in pairs(unitData) do
      if toUnload[triggerInfo.id] then
        unitData[triggerInfo] = nil
      end
    end
  end
end

function BuffTrigger.FinishLoadUnload()
  -- Nothing!
end

--- Removes all data for an aura id
--- @param id number
function BuffTrigger.Delete(id)
  BuffTrigger.UnloadDisplays({[id] = true})
  triggerInfos[id] = nil
end

--- Updates all data for aura oldid to use newid
--- @param oldid number
--- @param newid number
function BuffTrigger.Rename(oldid, newid)
  triggerInfos[newid] = triggerInfos[oldid]
  triggerInfos[oldid] = nil

  if triggerInfos[newid] then
    for triggernum, triggerData in pairs(triggerInfos[newid]) do
      triggerData.id = newid
    end
  end

  matchDataByTrigger[newid] = matchDataByTrigger[oldid]
  matchDataByTrigger[oldid] = nil

  for unit, unitData in pairs(matchData) do
    for filter, filterData in pairs(unitData) do
      for index, indexData in pairs(filterData) do
        indexData.auras[newid] = indexData.auras[oldid]
        indexData.auras[oldid] = nil
      end
    end
  end

  for unit, unitData in pairs(unitExistScanFunc) do
    unitData[newid] = unitData[oldid]
    unitData[oldid] = nil
  end
  groupRoleScanFunc[newid] = groupRoleScanFunc[oldid]
  groupRoleScanFunc[oldid] = nil
  raidMarkScanFuncs[newid] = raidMarkScanFuncs[oldid]
  raidMarkScanFuncs[oldid] = nil
  matchDataChanged[newid] = matchDataChanged[oldid]
  matchDataChanged[oldid] = nil
end

local function createScanFunc(trigger)
  local canHaveMatchCheck = CanHaveMatchCheck(trigger)
  local isMulti = trigger.unit == "multi"
  local useStacks = canHaveMatchCheck and not isMulti and trigger.useStacks

  local use_stealable, use_isBossDebuff, use_castByPlayer
  if canHaveMatchCheck and not isMulti then
    use_stealable = trigger.use_stealable
    use_isBossDebuff = trigger.use_isBossDebuff
    use_castByPlayer = trigger.use_castByPlayer
  end
  local use_debuffClass = canHaveMatchCheck and not isMulti and trigger.use_debuffClass
  local use_tooltip = canHaveMatchCheck and not isMulti and trigger.fetchTooltip and trigger.use_tooltip
  local use_tooltipValue = canHaveMatchCheck and not isMulti and trigger.fetchTooltip and trigger.use_tooltipValue
  local use_total = canHaveMatchCheck and not isMulti and trigger.useTotal and trigger.total
  local use_ignore_name = canHaveMatchCheck and not isMulti and trigger.useIgnoreName and trigger.ignoreAuraNames
  local use_ignore_spellId = canHaveMatchCheck and not isMulti and trigger.useIgnoreExactSpellId and trigger.ignoreAuraSpellids

  if not useStacks and use_stealable == nil and use_isBossDebuff == nil and use_castByPlayer == nil
       and not use_debuffClass and trigger.ownOnly == nil
       and not use_tooltip and not use_tooltipValue and not trigger.useNamePattern and not use_total
       and not use_ignore_name and not use_ignore_spellId then
    return nil
  end

  local preamble = ""

  local ret = [=[
    return function(time, matchData)
  ]=]

  if use_total then
    local ret2 = [=[
      if not(matchData.duration / matchData.modRate %s %s) then
        return false
      end
    ]=]
    ret = ret .. ret2:format(trigger.totalOperator or ">=", tonumber(trigger.total) or 0)
  end

  if useStacks then
    local ret2 = [=[
      if not(matchData.stacks %s %s) then
        return false
      end
    ]=]
    ret = ret .. ret2:format(trigger.stacksOperator or ">=", tonumber(trigger.stacks) or 0)
  end

  if use_stealable then
    ret = ret .. [=[
      if not matchData.isStealable then
        return false
      end
    ]=]
  elseif use_stealable == false then
    ret = ret .. [=[
      if matchData.isStealable then
        return false
      end
    ]=]
  end

  if use_isBossDebuff then
    ret = ret .. [=[
      if not matchData.isBossDebuff then
        return false
      end
    ]=]
  elseif use_isBossDebuff == false then
    ret = ret .. [=[
      if matchData.isBossDebuff then
        return false
      end
    ]=]
  end

  if use_castByPlayer then
    ret = ret .. [=[
      if not matchData.isCastByPlayer then
        return false
      end
    ]=]
  elseif use_castByPlayer == false then
    ret = ret .. [=[
      if matchData.isCastByPlayer then
        return false
      end
    ]=]
  end

  if use_debuffClass then
    local ret2 = [=[
      local tDebuffClass = %s;
      if not tDebuffClass[matchData.debuffClass] then
        return false
      end
    ]=]
    ret = ret .. ret2:format(trigger.debuffClass and type(trigger.debuffClass) == "table" and Private.SerializeTable(trigger.debuffClass) or "{}")
  end

  if trigger.ownOnly then
    ret = ret .. [=[
      if matchData.unitCaster ~= 'player' and matchData.unitCaster ~= 'pet' and matchData.unitCaster ~= 'vehicle' then
        return false
      end
    ]=]
  elseif trigger.ownOnly == false then
    ret = ret .. [=[
      if matchData.unitCaster == 'player' or matchData.unitCaster == 'pet' or matchData.unitCaster == 'vehicle' then
        return false
      end
    ]=]
  end

  if use_tooltip and trigger.tooltip_operator and trigger.tooltip then
    if trigger.tooltip_operator == "==" then
      local ret2 = [=[
      if not matchData.tooltip or matchData.tooltip ~= %s then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.tooltip))
    elseif trigger.tooltip_operator == "find('%s')" then
      local ret2 = [=[
      if not matchData.tooltip or not matchData.tooltip:find(%s, 1, true) then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.tooltip))
    elseif trigger.tooltip_operator == "match('%s')" then
      local ret2 = [=[
      if not matchData.tooltip or not matchData.tooltip:match(%s) then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.tooltip))
    end
  end

  if use_tooltipValue and trigger.tooltipValueNumber and trigger.tooltipValue_operator and trigger.tooltipValue then
    local property = "tooltip" .. tonumber(trigger.tooltipValueNumber)
    local ret2 = [=[
      if not matchData.%s or not (matchData.%s %s %s) then
        return false
      end
    ]=]
    ret = ret .. ret2:format(property, property, trigger.tooltipValue_operator, trigger.tooltipValue)
  end

  if trigger.useNamePattern and trigger.namePattern_operator and trigger.namePattern_name then
    if trigger.namePattern_operator == "==" then
      local ret2 = [=[
      if not matchData.name == %s then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.namePattern_name))
    elseif trigger.namePattern_operator == "find('%s')" then
      local ret2 = [=[
      if not matchData.name:find(%s, 1, true) then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.namePattern_name))
    elseif trigger.namePattern_operator == "match('%s')" then
      local ret2 = [=[
      if not matchData.name:match(%s) then
        return false
      end
      ]=]
      ret = ret .. ret2:format(Private.QuotedString(trigger.namePattern_name))
    end
  end

  if use_ignore_name then
    local names = {}
    for index, spellName in ipairs(trigger.ignoreAuraNames) do
      local spellId = WeakAuras.SafeToNumber(spellName)
      local name = GetSpellInfo(spellId) or spellName
      tinsert(names, name)
    end

    preamble = preamble .. "local ignoreNames = {\n"
    for index, name in ipairs(names) do
      preamble = preamble .. string.format("  [%q] = true,\n", name)
    end
    preamble = preamble .. "}\n"
    ret = ret .. [=[
      if ignoreNames[matchData.name] then
        return false
      end
    ]=]
  end

  if use_ignore_spellId then
    preamble = preamble .. "local ignoreSpellId = {\n"
    for index, spellId in ipairs(trigger.ignoreAuraSpellids) do
      local spell = WeakAuras.SafeToNumber(spellId)
      if spell then
        preamble = preamble .. string.format("  [%s]  = true,\n", spell)
      end
    end
    preamble = preamble .. "}\n"
    ret = ret .. [=[
      if ignoreSpellId[matchData.spellId] then
        return false
      end
    ]=]
  end

  ret = ret .. [=[
      return true
    end
  ]=]

  local func, err = loadstring(preamble .. ret)

  if func then
    return func()
  end
end

local function highestExpirationTime(bestMatch, auraMatch)
  if bestMatch.expirationTime and auraMatch.expirationTime then
    return auraMatch.expirationTime > bestMatch.expirationTime
  end
  return true
end

local function lowestExpirationTime(bestMatch, auraMatch)
  if bestMatch.expirationTime and auraMatch.expirationTime then
    return auraMatch.expirationTime < bestMatch.expirationTime
  end
  return false
end

local function GreaterEqualOne(x)
  return x >= 1
end

local function EqualZero(x)
  return x == 0
end

local function InitProblems()
  return {
    untrackableSoftTarget = {
      severity = "info",
      message = L["A trigger in this aura is set up to track a soft target unit, but you don't have the CVars set up for this to work correctly. Consider either changing the unit tracked, or configuring the Soft Target CVars."],
      flagged = false,
      check = function(trigger)
        return WeakAuras.IsUntrackableSoftTarget(trigger.unit)
      end
    }
  }
end

local function CheckProblems(trigger, problems)
  for _, problem in pairs(problems) do
    if not problem.flagged and problem.check(trigger) then
      problem.flagged = true
      break
    end
  end
end

local function PublishProblems(problems, uid)
  for key, problem in pairs(problems) do
    if problem.flagged then
      Private.AuraWarnings.UpdateWarning(uid, key, problem.severity, problem.message, problem.printOnConsole)
    else
      Private.AuraWarnings.UpdateWarning(uid, key)
    end
  end
end

--- Adds an aura, setting up internal data structures for all buff triggers.
--- @param data auraData
function BuffTrigger.Add(data)
  local id = data.id

  triggerInfos[id] = nil
  local problems = InitProblems()
  for triggernum, triggerData in ipairs(data.triggers) do
    local trigger = triggerData.trigger
    if trigger.type == "aura2" then

      trigger.unit = trigger.unit or "player"
      trigger.debuffType = trigger.debuffType or "HELPFUL"

      local combineMode = "showOne"
      local perUnitMode

      CheckProblems(trigger, problems)

      if not IsSingleMissing(trigger) and trigger.showClones then
        if IsGroupTrigger(trigger) and trigger.combinePerUnit then
          combineMode = "showPerUnit"
          if trigger.unit == "multi" then
            perUnitMode = "affected"
          else
            perUnitMode = trigger.perUnitMode or "affected"
          end
        else
          combineMode = "showClones"
        end
      end

      local scanFunc = createScanFunc(trigger)

      local remFunc
      if trigger.unit ~= "multi" and CanHaveMatchCheck(trigger) and trigger.useRem then
        local remFuncStr = Private.function_strings.count:format(trigger.remOperator or ">=", tonumber(trigger.rem) or 0)
        remFunc = Private.LoadFunction(remFuncStr)
      end

      local names
      if trigger.useName and trigger.auranames then
        names = {}
        for index, spellName in ipairs(trigger.auranames) do
          local spellId = WeakAuras.SafeToNumber(spellName)
          names[index] = GetSpellInfo(spellId) or spellName
        end
      end

      local showIfInvalidUnit
      if trigger.unit ~= "player" and not IsGroupTrigger(trigger) then
        showIfInvalidUnit = trigger.unitExists or false
      end
      local effectiveUseGroupCount = IsGroupTrigger(trigger) and trigger.useGroup_count
      local groupCountFunc
      if effectiveUseGroupCount then
        local group_countFuncStr
        local count, countType = Private.ParseNumber(trigger.group_count)
        if trigger.group_countOperator and count and countType then
          if countType == "whole" then
            group_countFuncStr = Private.function_strings.count:format(trigger.group_countOperator, count)
          else
            group_countFuncStr = Private.function_strings.count_fraction:format(trigger.group_countOperator, count)
          end
        else
          group_countFuncStr = Private.function_strings.count:format(">", 0)
        end
        groupCountFunc = Private.LoadFunction(group_countFuncStr)
      end

      local matchCountFunc
      if HasMatchCount(trigger) and trigger.match_countOperator and trigger.match_count and tonumber(trigger.match_count) then
        local count = tonumber(trigger.match_count)
        local match_countFuncStr = Private.function_strings.count:format(trigger.match_countOperator, count)
        matchCountFunc = Private.LoadFunction(match_countFuncStr)
      elseif IsGroupTrigger(trigger) then
        if trigger.showClones and not trigger.combinePerUnit then
          matchCountFunc = GreaterEqualOne
        end
      elseif not IsGroupTrigger(trigger) then
        if trigger.matchesShowOn == "showOnMissing" then
          matchCountFunc = EqualZero
        elseif trigger.matchesShowOn == "showOnActive" or not trigger.matchesShowOn then
          matchCountFunc = GreaterEqualOne
        end
      end

      local matchPerUnitCountFunc
      if IsGroupTrigger(trigger) and combineMode == "showPerUnit" and perUnitMode ~= "unaffected" and trigger.useMatchPerUnit_count
         and tonumber(trigger.matchPerUnit_count) and trigger.matchPerUnit_countOperator then
        local count = tonumber(trigger.matchPerUnit_count)
        local match_countFuncStr = Private.function_strings.count:format(trigger.matchPerUnit_countOperator, count)
        matchPerUnitCountFunc = Private.LoadFunction(match_countFuncStr)
      end

      local groupTrigger = trigger.unit == "group" or trigger.unit == "raid" or trigger.unit == "party"
      local effectiveIgnoreSelf = (groupTrigger or trigger.unit == "nameplate") and trigger.ignoreSelf
      local effectiveGroupRole = WeakAuras.IsWrathOrRetail() and (groupTrigger and trigger.useGroupRole and trigger.group_role) or nil
      local effectiveRaidRole = WeakAuras.IsClassicEraOrWrath() and (groupTrigger and trigger.useRaidRole and trigger.raid_role) or nil
      local effectiveClass = groupTrigger and trigger.useClass and trigger.class
      local effectiveSpecId = WeakAuras.IsRetail() and (groupTrigger and trigger.useActualSpec and trigger.actualSpec) or nil
      local effectiveArenaSpec = WeakAuras.IsRetail() and (trigger.unit == "arena" and trigger.useArenaSpec and trigger.arena_spec) or nil
      local effectiveHostility = trigger.unit == "nameplate" and trigger.useHostility and trigger.hostility
      local effectiveIgnoreDead = groupTrigger and trigger.ignoreDead
      local effectiveIgnoreDisconnected = groupTrigger and trigger.ignoreDisconnected
      local effectiveIgnoreInvisible = groupTrigger and trigger.ignoreInvisible
      local effectiveNameCheck = groupTrigger and trigger.useUnitName and trigger.unitName
      local effectiveNpcId = trigger.unit == "nameplate" and trigger.useNpcId and trigger.npcId

      if trigger.unit == "multi" then
        BuffTrigger.InitMultiAura()
      end

      local auraspellids
      if trigger.useExactSpellId and trigger.auraspellids then
        auraspellids = {}
        for _, spellIdString in ipairs(trigger.auraspellids) do
          if spellIdString ~= "" then
            local spellId = tonumber(spellIdString)
            if spellId then
              tinsert(auraspellids, spellId)
            end
          end
        end
      end

      local unit
      local groupSubType = "group"
      if trigger.unit == "member" then
        unit = trigger.specificUnit
      elseif trigger.unit == "raid" then
        unit = "group"
        groupSubType = "raid"
      elseif trigger.unit == "party" then
        unit = "group"
        groupSubType = "party"
      else
        unit = trigger.unit
      end

      local triggerInformation = {
        auranames = names,
        auraspellids = auraspellids,
        unit = unit,
        debuffType = trigger.debuffType,
        ownOnly = trigger.ownOnly,
        combineMode = combineMode,
        perUnitMode = perUnitMode,
        scanFunc = scanFunc,
        remainingFunc = remFunc,
        remainingCheck = trigger.unit ~= "multi" and CanHaveMatchCheck(trigger) and trigger.useRem and tonumber(trigger.rem) or 0,
        id = id,
        triggernum = triggernum,
        compareFunc = trigger.combineMode == "showHighest" and highestExpirationTime or lowestExpirationTime,
        unitExists = showIfInvalidUnit,
        fetchTooltip = not IsSingleMissing(trigger) and trigger.unit ~= "multi" and trigger.fetchTooltip,
        fetchRole = WeakAuras.IsRetail() and trigger.unit ~= "multi" and trigger.fetchRole,
        fetchRaidMark = trigger.unit ~= "multi" and trigger.fetchRaidMark,
        groupTrigger = IsGroupTrigger(trigger),
        ignoreSelf = effectiveIgnoreSelf,
        ignoreDead = effectiveIgnoreDead,
        ignoreDisconnected = effectiveIgnoreDisconnected,
        ignoreInvisible = effectiveIgnoreInvisible,
        groupRole = effectiveGroupRole,
        raidRole = effectiveRaidRole,
        specId = effectiveSpecId,
        arenaSpec = effectiveArenaSpec,
        groupSubType = groupSubType,
        groupCountFunc = groupCountFunc,
        class = effectiveClass,
        hostility = effectiveHostility,
        matchCountFunc = matchCountFunc,
        matchPerUnitCountFunc = matchPerUnitCountFunc,
        useAffected = unit == "group" and trigger.useAffected,
        isMulti = trigger.unit == "multi",
        nameChecker = effectiveNameCheck and Private.ExecEnv.ParseNameCheck(trigger.unitName),
        includePets = trigger.use_includePets and trigger.includePets or nil,
        npcId = effectiveNpcId
      }
      triggerInfos[id] = triggerInfos[id] or {}
      triggerInfos[id][triggernum] = triggerInformation
    end
  end
  PublishProblems(problems, data.uid)
end

--- Returns whether the trigger can have a duration.
--- @param data table
--- @param triggernum number
function BuffTrigger.CanHaveDuration(data, triggernum)
  return "timed"
end

--- Returns a table containing the names of all overlays
--- @param data table
--- @param triggernum number
function BuffTrigger.GetOverlayInfo(data, triggernum)
  return {}
end

--- Returns whether the trigger can have clones.
--- @param data table
--- @param triggernum number
--- @return boolean
function BuffTrigger.CanHaveClones(data, triggernum)
  local trigger = data.triggers[triggernum].trigger
  if not IsSingleMissing(trigger) and trigger.showClones then
    return true
  end
  return false
end

---Returns the type of tooltip to show for the trigger.
--- @param data table
--- @param triggernum number
--- @return string
function BuffTrigger.CanHaveTooltip(data, triggernum)
  return "aura"
end

--- @return boolean
function BuffTrigger.SetToolTip(trigger, state)
  if newAPI then
    if not state.unit or not state.auraInstanceID then
      return false
    end
    if state.filter == "HELPFUL" then
      GameTooltip:SetUnitBuffByAuraInstanceID(state.unit, state.auraInstanceID, state.filter)
    elseif state.filter == "HARMFUL" then
      GameTooltip:SetUnitDebuffByAuraInstanceID(state.unit, state.auraInstanceID, state.filter)
    end
  else
    if not state.unit or not state.index then
      return false
    end
    if state.filter == "HELPFUL" then
      GameTooltip:SetUnitBuff(state.unit, state.index)
    elseif state.filter == "HARMFUL" then
      GameTooltip:SetUnitDebuff(state.unit, state.index)
    end
  end
  return true
end


function BuffTrigger.GetNameAndIconSimple(data, triggernum)
  if not data then
    return
  end
  local _, name, icon
  local trigger = data.triggers[triggernum].trigger

  if trigger.useName and trigger.auranames then
    for index, spellName in ipairs(trigger.auranames) do
      local spellId = WeakAuras.SafeToNumber(spellName)
      if spellId then
        name, _, icon = GetSpellInfo(spellName)
        if name and icon then
          return name, icon
        end
      elseif not tonumber(spellName) then
        name, _, icon = GetSpellInfo(spellName)
        if (name and icon) then
          return name, icon
        end
      end
    end
  end

  if trigger.useExactSpellId and trigger.auraspellids then
    for index, spellIdString in ipairs(trigger.auraspellids) do
      local spellId = spellIdString ~= "" and tonumber(spellIdString)
      if spellId then
        name, _, icon = GetSpellInfo(spellIdString)
        if name and icon then
          return name, icon
        end
      end
    end
  end
end

--- Returns the name and icon to show in the options.
--- @param data table
--- @param triggernum number
--- @return string|nil name, any icon
function BuffTrigger.GetNameAndIcon(data, triggernum)
  local name, icon = BuffTrigger.GetNameAndIconSimple(data, triggernum)
  if (not name or not icon and WeakAuras.spellCache) then
    local trigger = data.triggers[triggernum].trigger
    if trigger.useName and trigger.auranames then
      for index, spellName in ipairs(trigger.auranames) do
        icon = WeakAuras.spellCache.GetIcon(spellName)
        if icon then
          return spellName, icon
        end
      end
    end
  end
  return name, icon
end

--- Returns the tooltip text for additional properties.
--- @param data table
--- @param triggernum number
--- @return string @additional properties
function BuffTrigger.GetAdditionalProperties(data, triggernum)
  local trigger = data.triggers[triggernum].trigger

  local ret =  "|cFFFF0000%".. triggernum .. ".spellId|r - " .. L["Spell ID"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".debuffClass|r - " .. L["Debuff Class"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".debuffClassIcon|r - " .. L["Debuff Class Icon"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".unitCaster|r - " .. L["Caster Unit"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".casterName|r - " .. L["Caster Name"] .. "\n"
  if trigger.unit ~= "multi" then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".unit|r - " .. L["Unit"] .. "\n"
  end
  ret = ret .. "|cFFFF0000%".. triggernum .. ".unitName|r - " .. L["Unit Name"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".matchCount|r - " .. L["Match Count"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".matchCountPerUnit|r - " .. L["Match Count per Unit"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".unitCount|r - " .. L["Units Affected"] .. "\n"
  ret = ret .. "|cFFFF0000%".. triggernum .. ".totalStacks|r - " .. L["Total stacks over all matches"] .. "\n"

  if trigger.unit ~= "multi" then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".maxUnitCount|r - " .. L["Total Units"] .. "\n"
  end

  if not IsSingleMissing(trigger) and trigger.unit ~= "multi" and trigger.fetchTooltip then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".tooltip|r - " .. L["Tooltip"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".tooltip1|r - " .. L["First Value of Tooltip Text"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".tooltip2|r - " .. L["Second Value of Tooltip Text"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".tooltip3|r - " .. L["Third Value of Tooltip Text"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".tooltip4|r - " .. L["Fourth Value of Tooltip Text"] .. "\n"
  end

  if WeakAuras.IsRetail() and trigger.unit ~= "multi" and trigger.fetchRole then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".role|r - " .. L["Assigned Role"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".roleIcon|r - " .. L["Assigned Role Icon"] .. "\n"
  end

  if trigger.unit ~= "multi" and trigger.fetchRaidMark then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".raidMark|r - " .. L["Raid Mark"] .. "\n"
  end

  if (trigger.unit == "group" or trigger.unit == "raid" or trigger.unit == "party") and trigger.useAffected then
    ret = ret .. "|cFFFF0000%".. triggernum .. ".affected|r - " .. L["Names of affected Players"] .. "\n"
    ret = ret .. "|cFFFF0000%".. triggernum .. ".unaffected|r - " .. L["Names of unaffected Players"] .. "\n"
  end

  return ret
end

function BuffTrigger.GetTriggerConditions(data, triggernum)
  local trigger = data.triggers[triggernum].trigger
  local result = {}

  result["debuffClass"] = {
    display = L["Debuff Type"],
    type = "select",
    values = Private.debuff_class_types
  }

  result["unitCaster"] = {
    display = L["Caster"],
    type = "string"
  }

  result["expirationTime"] = {
    display = L["Remaining Duration"],
    type = "timer",
    useModRate = true
  }

  result["duration"] = {
    display = L["Total Duration"],
    type = "number",
    useModRate = true
  }

  result["stacks"] = {
    display = L["Stacks"],
    type = "number"
  }

  result["name"] = {
    display = L["Name"],
    type = "string"
  }

  result["spellId"] = {
    display = L["Spell Id"],
    type = "number",
    operator_types = "only_equal"
  }

  result["matchCount"] = {
    display = L["Total Match Count"],
    type = "number"
  }

  result["matchCountPerUnit"] = {
    display = L["Match Count per Unit"],
    type = "number"
  }

  result["unitCount"] = {
    display = L["Affected Unit Count"],
    type = "number"
  }

  result["totalStacks"] = {
    display = L["Total Stacks"],
    type = "number"
  }

  if trigger.unit ~= "multi" then
    result["maxUnitCount"] = {
      display = L["Total Unit Count"],
      type = "number"
    }
  end

  if not IsGroupTrigger(trigger) and trigger.matchesShowOn == "showAlways"
    or IsGroupTrigger(trigger) and trigger.showClones and trigger.unit ~= "multi" and trigger.combinePerUnit
  then
    result["buffed"] = {
      display = L["Aura(s) Found"],
      type = "bool",
      test = function(state, needle)
        return state and state.show and ((state.active and true or false) == (needle == 1))
      end
    }
  end

  if not IsSingleMissing(trigger) and trigger.unit ~= "multi" and trigger.fetchTooltip then
    result["tooltip1"] = {
      display = L["Tooltip Value 1"],
      type = "number"
    }
    result["tooltip2"] = {
      display = L["Tooltip Value 2"],
      type = "number"
    }
    result["tooltip3"] = {
      display = L["Tooltip Value 3"],
      type = "number"
    }
    result["tooltip4"] = {
      display = L["Tooltip Value 4"],
      type = "number"
    }
  end

  if trigger.unit ~= "multi" then
    result["stackGainTime"] = {
      display = L["Since Stack Gain"],
      type = "elapsedTimer"
    }
    result["stackLostTime"] = {
      display = L["Since Stack Lost"],
      type = "elapsedTimer"
    }
    result["initialTime"] = {
      display = L["Since Apply"],
      type = "elapsedTimer"
    }
    result["refreshTime"] = {
      display = L["Since Apply/Refresh"],
      type = "elapsedTimer"
    }
  end

  return result
end

function BuffTrigger.CreateFallbackState(data, triggernum, state)
  state.show = true
  state.changed = true
  state.progressType = "timed"
  state.duration = 0
  state.expirationTime = math.huge
  state.modRate = 1
  local name, icon = BuffTrigger.GetNameAndIconSimple(data, triggernum)
  state.name = name
  state.icon = icon
end

function BuffTrigger.GetName(triggerType)
  if triggerType == "aura2" then
    return L["Aura"]
  end
end

function Private.CanConvertBuffTrigger2(trigger)
  if trigger.type ~= "aura" then
    return false
  end

  if trigger.unit == "multi" then
    return true, L["Note: The available text replacements for multi triggers match the normal triggers now."]
  end

  if trigger.unit and trigger.hideAlone then
    return false, L["Note: 'Hide Alone' is not available in the new aura tracking system. A load option can be used instead."]
  end

  if trigger.unit == "group" then
    return true, L["Warning: Name info is now available via %affected, %unaffected. Number of affected group members via %unitCount. Some options behave differently now. This is not automatically adjusted."]
  end

  if trigger.fullscan then
    if trigger.subcount then
      return true, L["Warning: Tooltip values are now available via %tooltip1, %tooltip2, %tooltip3 instead of %s. This is not automatically adjusted."]
    end

    if trigger.use_name and trigger.use_spellId then
      return false, L["Warning: Full Scan auras checking for both name and spell id can't be converted."]
    end
  end

  return true
end

function Private.ConvertBuffTrigger2(trigger)
  if not Private.CanConvertBuffTrigger2(trigger) then
    return
  end
  trigger.type = "aura2"

  if trigger.fullscan and trigger.autoclone then
    trigger.combineMatches = "showClones"
  else
    trigger.combineMatches = "showLowest"
  end

  if trigger.fullscan and trigger.use_stealable then
    trigger.use_stealable = true
  else
    trigger.use_stealable = nil
  end

  if trigger.fullscan and trigger.use_debuffClass and trigger.debuffClass then
  else
    trigger.use_debuffClass = false
  end

  if trigger.fullscan and trigger.use_tooltip then
    trigger.fetchTooltip = true
  else
    trigger.use_tooltip = false
  end

  if trigger.fullscan and trigger.subcount then
    trigger.fetchTooltip = true
  end

  if trigger.fullscan and trigger.use_name then
    trigger.useNamePattern = true
    trigger.namePattern_operator = trigger.name_operator
    trigger.namePattern_name = trigger.name
  end

  if trigger.fullscan then
    -- Use name from fullscan
    if trigger.use_name then
      if trigger.name_operator == "==" then
        -- Convert to normal name check
        trigger.useName = true
        trigger.auranames = {}
        trigger.auranames[1] = trigger.name
      end
    end
    if trigger.use_spellId then
      trigger.useExactSpellId = true
      trigger.auraspellids = {}
      trigger.auraspellids[1] = trigger.spellId
    end
  else
    trigger.useName = true
  end

  if not trigger.fullscan and trigger.unit ~= "multi" then
    trigger.auranames = {}
    for i = 1, 9 do
      trigger.auranames[i] = trigger.spellIds[i] and tostring(trigger.spellIds[i]) or trigger.names[i]
    end
  end

  if trigger.unit == "multi" then
    -- Closest to the old behavior
    trigger.showClones = true
    trigger.useName = true
    trigger.auranames = {}
    trigger.auranames[1] = tostring(trigger.spellId) or trigger.name
  end

  -- debuffType is exactly the same, no need to touch it
  -- remaining is exactly the same for now
  -- ownOnly is exactly the same
  -- unitExists is exactly the same

  if trigger.useCount then
    trigger.useStacks = trigger.useCount
    trigger.stacksOperator = trigger.countOperator
    trigger.stacks = trigger.count
  end

  if trigger.fullscan and trigger.autoclone then
    trigger.matchesShowOn = "showOnActive"
  else
    trigger.matchesShowOn = trigger.buffShowOn
  end

  if trigger.unit == "group" then
    trigger.matchesShowOn = nil
    trigger.showClones = trigger.groupclone
  end

  if trigger.unit == "group" and not trigger.groupclone then
    if trigger.name_info == "players" or trigger.name_info == "nonplayers" then
      trigger.useAffected = true
    end
  end

  if trigger.unit == "group" and trigger.group_countOperator and trigger.group_count then
    trigger.useGroup_count = true
  else
    trigger.useGroup_count = false
  end
end

-- Multi Target trigger code
local multiAuraFrame
local pendingTracks = {}

local unitToGuid = {}
local guidToUnit = {}

local function ReleaseUID(unit)
  local guid = unitToGuid[unit]
  if guid then
    guidToUnit[guid][unit] = nil
  end
end

local function SetUID(guid, unit)
  ReleaseUID(unit)

  unitToGuid[unit] = guid
  guidToUnit[guid] = guidToUnit[guid] or {}
  guidToUnit[guid][unit] = true
end

local function GetUnit(guid)
  if not guidToUnit[guid] then
    return nil
  end
  for unit in pairs(guidToUnit[guid]) do
    if UnitGUID(unit) == guid then
      return unit
    else
      guidToUnit[guid][unit] = nil
    end
  end
end

local function TrackUid(unit)
  local GUID = UnitGUID(unit)
  if GUID then
    SetUID(GUID, unit)
    BuffTrigger.HandlePendingTracks(unit, GUID)
  else
    ReleaseUID(unit)
  end
  unit = unit.."target"
  GUID = UnitGUID(unit)
  if GUID then
    SetUID(GUID, unit)
    BuffTrigger.HandlePendingTracks(unit, GUID)
  else
    ReleaseUID(unit)
  end
end

local function RemoveMatchDataMulti(base, destGUID, key, sourceGUID)
  if base[key] and base[key][sourceGUID] then
    for id, idData in pairs(base[key][sourceGUID].auras) do
      for triggernum, triggerData in pairs(idData) do
        tDeleteItem(matchDataByTrigger[id][triggernum][destGUID], base[key][sourceGUID])
        if not next(matchDataByTrigger[id][triggernum][destGUID]) then
          matchDataByTrigger[id][triggernum][destGUID] = nil
        end
        matchDataChanged[id] = matchDataChanged[id] or {}
        matchDataChanged[id][triggernum] = true
      end
    end
    base[key][sourceGUID] = nil
  end
end

local function CleanUpMulti(guid)
  cleanupTimerMulti[guid].handle = nil
  cleanupTimerMulti[guid].nextTime = nil
  local nextCheck
  if matchDataMulti[guid] then
    local time = GetTime()
    for key, data in pairs(matchDataMulti[guid]) do
      for source, sourceData in pairs(data) do
        local removeAt
        if sourceData.expirationTime and sourceData.expirationTime ~= math.huge then
          removeAt = sourceData.expirationTime
        else
          removeAt = sourceData.time + 60
        end
        if removeAt <= time then
          RemoveMatchDataMulti(matchDataMulti[guid], guid, key, source)
        else
          if not nextCheck then
            nextCheck = removeAt
          elseif (removeAt < nextCheck) then
            nextCheck = removeAt
          end
        end
      end
    end
  end

  if nextCheck then
    local timeUntilNext = nextCheck - GetTime()
    if timeUntilNext > 0 then
      cleanupTimerMulti[guid].handle = timer:ScheduleTimerFixed(CleanUpMulti, timeUntilNext, guid)
      cleanupTimerMulti[guid].nextTime = nextCheck
   end
  end
end

local function ScheduleMultiCleanUp(guid, time)
  cleanupTimerMulti[guid] = cleanupTimerMulti[guid] or {}
  if not cleanupTimerMulti[guid].nextTime or time < cleanupTimerMulti[guid].nextTime then
    if cleanupTimerMulti[guid].handle then
      timer:CancelTimer(cleanupTimerMulti[guid].handle)
    end
    cleanupTimerMulti[guid].handle = timer:ScheduleTimerFixed(CleanUpMulti, time - GetTime(), guid)
    cleanupTimerMulti[guid].nextTime = time
  end
end

local function UpdateMatchDataMulti(time, base, key, event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
  local updated = false
  local icon = spellId and select(3, GetSpellInfo(spellId))
  ScheduleMultiCleanUp(destGUID, time + 60)
  if not base[key] or not base[key][sourceGUID] then
    updated = true
    base[key] = base[key] or {}
    base[key][sourceGUID] = {
      name = spellName,
      icon = icon,
      duration = 0,
      expirationTime = math.huge,
      modRate = 1,
      spellId = spellId,
      GUID = destGUID,
      sourceGUID = sourceGUID,
      unitName = destName,
      casterName = sourceName,
      time = time,
      auras = {}
    }
  else
    base[key][sourceGUID] = base[key][sourceGUID] or {}
    local match = base[key][sourceGUID]
    match.time = time

    if match.name ~= spellName then
      match.name = spellName
      updated = true
    end

    if match.unitName ~= destName then
      match.unitName = destName
      updated = true
    end

    local duration, expirationTime
    if event == "SPELL_AURA_APPLIED_DOSE" or event == "SPELL_AURA_REMOVED_DOSE" then
      -- Shouldn't affect duration/expirationTime nor icon
      duration = match.duration or 0
      expirationTime = match.expirationTime or math.huge
      icon = match.icon or icon
    else
      duration = 0
      expirationTime = math.huge
    end

    if match.duration ~= duration then
      match.duration = duration
      updated = true
    end

    if match.expirationTime ~= expirationTime then
      match.expirationTime = expirationTime
      updated = true
    end

    if match.icon ~= icon then
      match.icon = icon
      updated = true
    end

    if match.count ~= amount then
      match.count = amount
      updated = true
    end

    if match.spellId ~= spellId then
      match.spellId = spellId
      updated = true
    end

    if match.casterName ~= sourceName then
      match.casterName = sourceName
      updated = true
    end
  end

  return updated
end

local function AugmentMatchDataMultiWith(matchData, unit, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate)
  if expirationTime == 0 then
    expirationTime = math.huge
  else
    ScheduleMultiCleanUp(matchData.GUID, expirationTime / (modRate or 1))
  end
  local changed = false
  if matchData.name ~= name then
    matchData.name = name
    changed = true
  end

  if matchData.icon ~= icon then
    matchData.icon = icon
    changed = true
  end

  if matchData.stacks ~= stacks then
    matchData.stacks = stacks
    changed = true
  end

  if matchData.debuffClass ~= debuffClass then
    matchData.debuffClass = debuffClass
    changed = true
  end

  local debuffClassIcon = WeakAuras.EJIcons[debuffClass]
  if matchData.debuffClassIcon ~= debuffClassIcon then
    matchData.debuffClassIcon = debuffClassIcon
    changed = true
  end

  if matchData.duration ~= duration then
    matchData.duration = duration
    changed = true
  end

  if matchData.expirationTime ~= expirationTime then
    matchData.expirationTime = expirationTime
    changed = true
  end

  if matchData.modRate ~= modRate then
    matchData.modRate = modRate
    changed = true
  end

  if matchData.unitCaster ~= unitCaster then
    matchData.unitCaster = unitCaster
    changed = true
  end

  local casterName = GetUnitName(unitCaster, false) or ""
  if matchData.casterName ~= casterName then
    matchData.casterName = casterName
    changed = true
  end

  local unitName = GetUnitName(unit, false) or ""
  if matchData.unitName ~= unitName then
    matchData.unitName = unitName
    changed = true
  end

  if matchData.spellId ~= spellId then
    matchData.spellId = name
    changed = true
  end
  return changed
end

local AugmentMatchDataMulti
do
  local _matchData, _unit, _sourceGUID, _nameKey, _spellKey
  local function HandleAura(aura)
    if (not aura or not aura.name) then
      return
    end
    local debuffClass = aura.dispelName
    if debuffClass == nil then
      debuffClass = "none"
    elseif debuffClass == "" then
      debuffClass = "enrage"
    else
      debuffClass = string.lower(debuffClass)
    end
    local auraSourceGuid = aura.sourceUnit and UnitGUID(aura.sourceUnit)
    local name = aura.name
    local spellId = aura.spellId
    if (name == _nameKey or spellId == _spellKey) and _sourceGUID == auraSourceGuid then
      local changed = AugmentMatchDataMultiWith(_matchData, _unit, name, aura.icon, aura.applications, debuffClass, aura.duration, aura.expirationTime, aura.sourceUnit, aura.isStealable, aura.isBossAura, aura.isFromPlayerOrPlayerPet, spellId, aura.timeMod)
      return changed
    end
  end

  AugmentMatchDataMulti = function(matchData, unit, filter, sourceGUID, nameKey, spellKey)
    if newAPI then
      _matchData, _unit, _sourceGUID, _nameKey, _spellKey = matchData, unit, sourceGUID, nameKey, spellKey
      AuraUtil.ForEachAura(unit, filter, nil, HandleAura, true)
    else
      local index = 1
      while true do
        local name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate = UnitAura(unit, index, filter)
        if not name then
          return false
        end

        if debuffClass == nil then
          debuffClass = "none"
        elseif debuffClass == "" then
          debuffClass = "enrage"
        else
          debuffClass = string.lower(debuffClass)
        end
        local auraSourceGuid = unitCaster and UnitGUID(unitCaster)
        if (name == nameKey or spellId == spellKey) and sourceGUID == auraSourceGuid then
          local changed = AugmentMatchDataMultiWith(matchData, unit, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate)
          return changed
        end
        index = index + 1
      end
    end
  end
end

local function HandleCombatLog(scanFuncsName, scanFuncsSpellId, filter, event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
  local time = GetTime()
  local unit = GetUnit(destGUID)
  if scanFuncsName and scanFuncsName[spellName] or scanFuncsSpellId and scanFuncsSpellId[spellId] then
    ScheduleMultiCleanUp(destGUID, time + 60)
    matchDataMulti[destGUID] = matchDataMulti[destGUID] or {}

    if scanFuncsSpellId and scanFuncsSpellId[spellId] then
      local updatedSpellId = UpdateMatchDataMulti(time, matchDataMulti[destGUID], spellId, event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
      if unit then
        updatedSpellId = AugmentMatchDataMulti(matchDataMulti[destGUID][spellId][sourceGUID], unit, filter, sourceGUID, nil, spellId) or updatedSpellId
      else
        pendingTracks[destGUID] = true
      end
      if updatedSpellId then
        for triggerInfo in pairs(scanFuncsSpellId[spellId]) do
          if MatchesTriggerInfoMulti(triggerInfo, sourceGUID) then
            ReferenceMatchDataMulti(matchDataMulti[destGUID][spellId][sourceGUID], triggerInfo.id, triggerInfo.triggernum, destGUID)
          end
        end
      end
    end

    if scanFuncsName and scanFuncsName[spellName] then
      local updatedName = UpdateMatchDataMulti(time, matchDataMulti[destGUID], spellName, event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
      if unit then
        updatedName = AugmentMatchDataMulti(matchDataMulti[destGUID][spellName][sourceGUID], unit, filter, sourceGUID, spellName, nil) or updatedName
      else
        pendingTracks[destGUID] = true
      end
      if updatedName then
        for triggerInfo in pairs(scanFuncsName[spellName]) do
          if MatchesTriggerInfoMulti(triggerInfo, sourceGUID) then
            ReferenceMatchDataMulti(matchDataMulti[destGUID][spellName][sourceGUID], triggerInfo.id, triggerInfo.triggernum, destGUID)
          end
        end
      end
    end
  end
end

local function HandleCombatLogRemove(scanFuncsName, scanFuncsSpellId, sourceGUID, destGUID, spellId, spellName)
  if scanFuncsName and scanFuncsName[spellName] or scanFuncsSpellId and scanFuncsSpellId[spellId] then
    if matchDataMulti[destGUID] then
      RemoveMatchDataMulti(matchDataMulti[destGUID], destGUID, spellId, sourceGUID)
      RemoveMatchDataMulti(matchDataMulti[destGUID], destGUID, spellName, sourceGUID)
    end
  end
end

local function CombatLog(_, event, _, sourceGUID, sourceName, _, _, destGUID, destName, _, _, spellId, spellName, _, auraType, amount)
  if event == "SPELL_AURA_APPLIED" or event == "SPELL_AURA_REFRESH" or event == "SPELL_AURA_APPLIED_DOSE" or event == "SPELL_AURA_REMOVED_DOSE" then
    if auraType == "BUFF" then
      HandleCombatLog(scanFuncNameMulti["HELPFUL"], scanFuncSpellIdMulti["HELPFUL"], "HELPFUL", event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
    elseif auraType == "DEBUFF" then
      HandleCombatLog(scanFuncNameMulti["HARMFUL"], scanFuncSpellIdMulti["HARMFUL"], "HARMFUL", event, sourceGUID, sourceName, destGUID, destName, spellId, spellName, amount)
    end
  elseif event == "SPELL_AURA_REMOVED" then
    if auraType == "BUFF" then
      HandleCombatLogRemove(scanFuncNameMulti["HELPFUL"], scanFuncSpellIdMulti["HELPFUL"], sourceGUID, destGUID, spellId, spellName)
    elseif auraType == "DEBUFF" then
      HandleCombatLogRemove(scanFuncNameMulti["HARMFUL"], scanFuncSpellIdMulti["HARMFUL"], sourceGUID, destGUID, spellId, spellName)
    end
  end
end

local CheckAurasMulti
do
  local _base, _unit
  local function HandleAura(aura)
    if (not aura or not aura.name) then
      return
    end
    local debuffClass = aura.dispelName
    if debuffClass == nil then
      debuffClass = "none"
    elseif debuffClass == "" then
      debuffClass = "enrage"
    else
      debuffClass = string.lower(debuffClass)
    end
    local auraCasterGUID = aura.sourceUnit and UnitGUID(aura.sourceUnit)
    local name = aura.name
    local spellId = aura.spellId
    if _base[name] and _base[name][auraCasterGUID] then
      local changed = AugmentMatchDataMultiWith(_base[name][auraCasterGUID], _unit, name, aura.icon, aura.applications, debuffClass, aura.duration, aura.expirationTime, aura.sourceUnit, aura.isStealable, aura.isBossAura, aura.isFromPlayerOrPlayerPet, spellId, aura.timeMod)
      if changed then
        for id, idData in pairs(_base[name][auraCasterGUID].auras) do
          for triggernum in pairs(idData) do
            matchDataChanged[id] = matchDataChanged[id] or {}
            matchDataChanged[id][triggernum] = true
          end
        end
      end
    end
    if _base[spellId] and _base[spellId][auraCasterGUID] then
      local changed = AugmentMatchDataMultiWith(_base[spellId][auraCasterGUID], _unit, aura.name, aura.icon, aura.applications, debuffClass, aura.duration, aura.expirationTime, aura.sourceUnit, aura.isStealable, aura.isBossAura, aura.isFromPlayerOrPlayerPet, spellId, aura.timeMod)
      if changed then
        for id, idData in pairs(_base[spellId][auraCasterGUID].auras) do
          for triggernum in pairs(idData) do
            matchDataChanged[id] = matchDataChanged[id] or {}
            matchDataChanged[id][triggernum] = true
          end
        end
      end
    end
  end

  CheckAurasMulti = function(base, unit, filter)
    if newAPI then
      _base = base
      _unit = unit
      AuraUtil.ForEachAura(unit, filter, nil, HandleAura, true)
    else
      local index = 1
      while true do
        local name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate = UnitAura(unit, index, filter)
        if not name then
          return false
        end

        if debuffClass == nil then
          debuffClass = "none"
        elseif debuffClass == "" then
          debuffClass = "enrage"
        else
          debuffClass = string.lower(debuffClass)
        end
        local auraCasterGUID = unitCaster and UnitGUID(unitCaster)
        if base[name] and base[name][auraCasterGUID] then
          local changed = AugmentMatchDataMultiWith(base[name][auraCasterGUID], unit, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate)
          if changed then
            for id, idData in pairs(base[name][auraCasterGUID].auras) do
              for triggernum in pairs(idData) do
                matchDataChanged[id] = matchDataChanged[id] or {}
                matchDataChanged[id][triggernum] = true
              end
            end
          end
        end
        if base[spellId] and base[spellId][auraCasterGUID] then
          local changed = AugmentMatchDataMultiWith(base[spellId][auraCasterGUID], unit, name, icon, stacks, debuffClass, duration, expirationTime, unitCaster, isStealable, _, spellId, _, _, _, _, modRate)
          if changed then
            for id, idData in pairs(base[spellId][auraCasterGUID].auras) do
              for triggernum in pairs(idData) do
                matchDataChanged[id] = matchDataChanged[id] or {}
                matchDataChanged[id][triggernum] = true
              end
            end
          end
        end
        index = index + 1
      end
    end
  end
end

function BuffTrigger.HandlePendingTracks(unit, GUID)
  if pendingTracks[GUID] then
    if matchDataMulti[GUID] then
      CheckAurasMulti(matchDataMulti[GUID], unit, "HELPFUL")
      CheckAurasMulti(matchDataMulti[GUID], unit, "HARMFUL")
    end
  end
end

function BuffTrigger.InitMultiAura()
  if not multiAuraFrame then
    multiAuraFrame = CreateFrame("Frame")
    multiAuraFrame:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
    multiAuraFrame:RegisterEvent("UNIT_TARGET")
    multiAuraFrame:RegisterEvent("UNIT_AURA")
    multiAuraFrame:RegisterEvent("PLAYER_TARGET_CHANGED")
    if not WeakAuras.IsClassicEra() then
      multiAuraFrame:RegisterEvent("PLAYER_SOFT_ENEMY_CHANGED")
      multiAuraFrame:RegisterEvent("PLAYER_SOFT_FRIEND_CHANGED")
      multiAuraFrame:RegisterEvent("PLAYER_FOCUS_CHANGED")
    end
    multiAuraFrame:RegisterEvent("NAME_PLATE_UNIT_ADDED")
    multiAuraFrame:RegisterEvent("NAME_PLATE_UNIT_REMOVED")
    multiAuraFrame:RegisterEvent("PLAYER_LEAVING_WORLD")
    multiAuraFrame:SetScript("OnEvent", BuffTrigger.HandleMultiEvent)
    Private.frames["Multi-target 2 Aura Trigger Handler"] = multiAuraFrame
  end
end

function BuffTrigger.HandleMultiEvent(frame, event, ...)
  Private.StartProfileSystem("bufftrigger2 - multi")
  if event == "COMBAT_LOG_EVENT_UNFILTERED" then
    CombatLog(CombatLogGetCurrentEventInfo())
  elseif event == "UNIT_TARGET" then
    TrackUid(...)
  elseif Private.player_target_events[event] then
    TrackUid(Private.player_target_events[event])
  elseif event == "NAME_PLATE_UNIT_ADDED" then
    TrackUid(...)
  elseif event == "NAME_PLATE_UNIT_REMOVED" then
    local unit = ...
    ReleaseUID(unit)
    unit = unit.."target"
    ReleaseUID(unit)
  elseif event == "UNIT_AURA" then
    local unit = ...
    local guid = UnitGUID(unit)
    if matchDataMulti[guid] then
      CheckAurasMulti(matchDataMulti[guid], unit, "HELPFUL")
      CheckAurasMulti(matchDataMulti[guid], unit, "HARMFUL")
    end
  elseif event == "PLAYER_LEAVING_WORLD" then
    -- Remove everything..
    for GUID, GUIDData  in pairs(matchDataMulti) do
      for key in pairs(GUIDData) do
        RemoveMatchDataMulti(GUIDData, GUID, key)
      end
    end
    wipe(matchDataMulti)
  end
  Private.StopProfileSystem("bufftrigger2 - multi")
end

function BuffTrigger.GetTriggerDescription(data, triggernum, namestable)
  local trigger = data.triggers[triggernum].trigger
  if trigger.useName and trigger.auranames then
    for index, name in pairs(trigger.auranames) do
      if index > 10 then
        tinsert(namestable, {" ", "[...]"})
        break
      end

      local left = " "
      if(index == 1) then
        if(#trigger.auranames > 0) then
          if(#trigger.auranames > 1) then
            left = L["Auras:"]
          else
            left = L["Aura:"]
          end
        end
      end
      local icon
      local spellId = WeakAuras.SafeToNumber(name)
      if spellId then
        icon = select(3, GetSpellInfo(spellId))
      else
        icon = WeakAuras.spellCache.GetIcon(name)
      end
      icon = icon or "Interface\\Icons\\INV_Misc_QuestionMark"
      tinsert(namestable, {left, name, icon})
    end
  end

  if trigger.useExactSpellId and  trigger.auraspellids then
    for index, spellId in pairs(trigger.auraspellids) do
      if index > 10 then
        tinsert(namestable, {" ", "[...]"})
        break
      end

      local left = " "
      if index == 1 then
        if #trigger.auraspellids > 0 then
          if #trigger.auraspellids > 1 then
            left = L["Spell IDs:"]
          else
            left = L["Spell ID:"]
          end
        end
      end

      local icon = select(3, GetSpellInfo(spellId)) or "Interface\\Icons\\INV_Misc_QuestionMark"
      tinsert(namestable, {left, spellId, icon})
    end
  end
end

function BuffTrigger.CreateFakeStates(id, triggernum)
  local allStates = WeakAuras.GetTriggerStateForTrigger(id, triggernum);
  local data = WeakAuras.GetData(id)
  local state = {}
  BuffTrigger.CreateFallbackState(data, triggernum, state)
  state.expirationTime = GetTime() + 60
  state.duration = 65
  state.progressType = "timed"
  state.stacks = 1
  allStates[""] = state
  if BuffTrigger.CanHaveClones(data, triggernum) then
    for i = 1, 2 do
      local state = {}
      BuffTrigger.CreateFallbackState(data, triggernum, state)
      state.expirationTime = GetTime() + 60 + i * 20
      state.duration = 100
      state.progressType = "timed"
      state.stacks = 1
      allStates[i] = state
    end
  end
end

WeakAuras.RegisterTriggerSystem({"aura2"}, BuffTrigger)