local _,rematch = ...
local L = rematch.localization
local C = rematch.constants
local settings = rematch.settings
rematch.frame = RematchFrame

local modules = {} -- ordered list of modules (should be table/frames with Configure, Resize and/or Update functions)
local showAfterCombat = false -- flag that becomes true when rematch was hidden due to combat and should return after combat
local chromeModules = {"titlebar","toolbar","bottombar","panelTabs","teamTabs"} -- for looping over these modules

-- when configure/resize/update happens, these fire after Rematch has finished its own configure/resize/update
local frameFuncEvents = {
    Configure = "REMATCH_UI_CONFIGURE",
    Resize = "REMATCH_UI_RESIZE",
    Update = "REMATCH_UI_UPDATE"
}

--[[
    rematch.frame:Register(module)
    - Adds a module to an ordered list. If the module has a function named Configure, Resize or Update,
      those functions will be called (in the order the module was registered) when one of the following
      Configure, Resize or Updates happen in this module.

    rematch.frame:Configure(layoutName)
    - Arranges all panels/chrome to the frame for the given layout (and whether it's for the journal), and
      calls all configure, resize and update functions for registered modules.

    rematch.frame:Resize()
    - Calls all resize and update functions for registered modules to allow panels/chrome to adjust their
      content based on size changes.

    rematch.frame:Update()
    - Calls all update functions for registered modules to update panel/chrome content.
]]

-- as described above, every panel or chrome that wants to run their Configure/Resize/Update needs to register here
-- module should be a parentKey of rematch namespace
function rematch.frame:Register(module)
    assert(type(module)=="string" and rematch[module] and type(rematch[module])=="table","Attempt to register an invalid module: "..tostring(module))
    tinsert(modules,rematch[module])
end

rematch.events:Register(rematch.frame,"PLAYER_LOGIN",function(self)
    rematch.events:Register(self,"PLAYER_ENTERING_WORLD",self.PLAYER_ENTERING_WORLD)
    rematch.events:Register(self,"PET_BATTLE_OPENING_START",self.PET_BATTLE_OPENING_START)
    rematch.events:Register(self,"REMATCH_PETS_LOADED",self.REMATCH_PETS_LOADED)
    self.CloseButton:Hide() -- using titlebar's close button
end)

--[[ script handlers ]]

function rematch.frame:OnMouseDown()
    if not rematch.journal:IsActive() and (not settings.LockPosition or IsShiftKeyDown()) then
        self:StartMoving()
    end
end

function rematch.frame:OnMouseUp()
    if not rematch.journal:IsActive() then
        self:StopMovingOrSizing()
        self:SetUserPlaced(false)
        self:SavePosition()
    end
end

function rematch.frame:OnShow()
    rematch.events:Register(self,"PLAYER_TARGET_CHANGED",self.PLAYER_TARGET_CHANGED)
    rematch.events:Register(rematch.frame,"PLAYER_REGEN_DISABLED",rematch.frame.PLAYER_REGEN_DISABLED)
    rematch.events:Register(rematch.frame,"PET_JOURNAL_LIST_UPDATE",rematch.frame.PET_JOURNAL_LIST_UPDATE)
    if not rematch.journal:IsActive() then
        PlaySound(C.SOUND_REMATCH_OPEN)
    end
end

function rematch.frame:OnHide()
    rematch.events:Unregister(self,"PLAYER_TARGET_CHANGED")
    rematch.events:Unregister(rematch.frame,"PLAYER_REGEN_DISABLED")
    rematch.events:Unregister(rematch.frame,"PET_JOURNAL_LIST_UPDATE")
    rematch.utils:HideWidgets()
    rematch.dialog:HideDialog() -- is there any reason for a dialog to remain up? if so, use version of uncommented code below
    -- local openDialog = rematch.dialog:GetOpenDialog()
    -- if openDialog=="CustomScaleDialog" then
    --     rematch.dialog.CancelButton:Click() -- if frame scale change is happening, cancel it if the frame hides before the dialog does
    -- end
    if rematch.sort:ClearStickiedPetIDs() then
        rematch.filters:ForceUpdate()
    end
    -- check if we need to prompt to backup teams
    rematch.timer:Start(0.1,rematch.teamStrings.CheckForBackup)
    if not rematch.journal:IsActive() then
        PlaySound(C.SOUND_REMATCH_CLOSE)
    end
end

--[[ toggles ]]

-- toggles the rematch window; if auto is true then it was summoned by interact or safari hat reminder
-- (or any "unattented" behavior)
function rematch.frame:Toggle(auto)
    if rematch.frame:IsVisible() then
        if rematch.journal:IsActive() then
            ToggleCollectionsJournal()
        else
            rematch.frame:Hide()
        end
    elseif not InCombatLockdown() then
        rematch.frame:Show()
        rematch.frame:Configure((auto and settings.PreferMinimized) and "0-minimized" or rematch.layout:GetLayout(C.STANDALONE))
    else
        rematch.utils:Write(L["Rematch can't be summoned during combat. Try again later"])
    end
end
RematchToggleWindow = rematch.frame.Toggle

-- minimizes or maximizes the frame (if in standalone mode); optionally maximizes to the given layoutName
function rematch.frame:ToggleMinimized(layoutName)
    if rematch.journal:IsActive() then
        return -- in journal mode, do nothing
    elseif rematch.layout:GetMode(C.CURRENT)==0 then -- currently minimized, restore maximized layout
        PlaySound(C.SOUND_PANEL_TAB)
        rematch.frame:Configure(layoutName or rematch.layout:GetLayout(C.MAXIMIZED))
    else -- not minimized, go to minimized layout
        PlaySound(C.SOUND_PANEL_TAB)
        rematch.frame:Configure("0-minimized")
    end
end

--[[ events ]]

-- this event just handles whether the LoadedTargetPanel appears in layouts where it only sometimes shows (minimized, single-panel,
-- or 2-queue where there's no space for a persistent LoadedTargetPanel). if the target panel needs to show or hide, this adjusts
-- the current layout and does a Configure
function rematch.frame:PLAYER_TARGET_CHANGED()
    local def = rematch.layout:GetDefinition(C.CURRENT)
    if def and def.hasTempTarget then -- we're in a layout where the target panel can come and go depending on target
        local shouldShowTarget = rematch.loadedTargetPanel:ShouldShowTarget()
        if shouldShowTarget and not def.subview then -- not showing target now but should show it
            rematch.frame:Configure(format("%d-%s-target",def.mode,def.view))
        elseif not shouldShowTarget and def.subview=="target" then -- showing target now but shoundn't show it
            rematch.frame:Configure(format("%d-%s",def.mode,def.view))
        end
    end
end

-- if LockWIndow (Keep Window On Screen) is not checked, then hide the window when we get a loading screen (instances)
function rematch.frame:PLAYER_ENTERING_WORLD()
    if not settings.LockWindow and not rematch.journal:IsActive() then
        self:Hide()
    end
end

-- on entering a pet battle, close window unless both LockWindow and StayForBattle enabled
local lastNotedTeamID -- the currentTeamID that had notes last displayed (for Show Notes In Battle -> Only Once Per Team)
function rematch.frame:PET_BATTLE_OPENING_START()
    if (not settings.LockWindow or not settings.StayForBattle) and not rematch.journal:IsActive() then
        self:Hide()
    end
    -- if Show Notes In Battle enabled, show notes
    local teamID = settings.currentTeamID
    if teamID and rematch.savedTeams[teamID] and rematch.savedTeams[teamID].notes and settings.ShowNotesInBattle then
        if not settings.ShowNotesOnce or lastNotedTeamID~=teamID then
            rematch.cardManager:ShowCard(rematch.notes,teamID)
        end
    end
    lastNotedTeamID = teamID
end

-- on login after pets are loaded, open window if LockWindow and StayOnLogout enabled
function rematch.frame:REMATCH_PETS_LOADED()
    if settings.LockWindow and settings.StayOnLogout then
        self:Toggle()
    end
end

-- rematch can't remain on screen during combat; if it's up as player enters combat, hide it but set a flag to bring it back after
function rematch.frame:PLAYER_REGEN_DISABLED()
    if rematch.frame:IsVisible() and not rematch.journal:IsActive() then -- journal will handle combat on its own
        rematch.frame:Hide()
        showAfterCombat = true
        -- register for leaving combat to know to bring window back
        rematch.events:Register(rematch.frame,"PLAYER_REGEN_ENABLED",rematch.frame.PLAYER_REGEN_ENABLED)
    end
end

-- after combat ends, if flag was set when rematch was hidden entering combat, then bring the window back
function rematch.frame:PLAYER_REGEN_ENABLED()
    if showAfterCombat then
        showAfterCombat = false
        -- can stop watching for this event until next showAfterCombat happens
        rematch.events:Unregister(rematch.frame,"PLAYER_REGEN_ENABLED")
        -- show the window in its last standalone state
        rematch.frame:Toggle()
    end
end

-- this can fire for pets changing (level, rarity, name, etc) as well as gaining/losing pets
function rematch.frame:PET_JOURNAL_LIST_UPDATE()
    rematch.timer:Start(0,self.Update)
end

--[[ Configure ]]

-- returns the layoutName,definition from the given layoutName (or current if none given)
-- if the view is invalid (like 3-pets) it will adjust to a valid view
local function negotiateLayout(layoutName)
    layoutName = rematch.layout:GetLayout(layoutName) -- validating layoutName and adjusting if needed
    local def = rematch.layout:GetDefinition(layoutName)

    -- if this is a layout with a TargetPanel only displayed while something saved is targeted, change layout if needed
    if def and def.hasTempTarget then
        local shouldShowTarget = rematch.loadedTargetPanel:ShouldShowTarget()
        if shouldShowTarget and not def.subview then
            layoutName = rematch.layout:GetLayout(format("%d-%s-target",def.mode,def.view))
            def = rematch.layout:GetDefinition(layoutName)
        elseif not shouldShowTarget and def.subview=="target" then
            layoutName = rematch.layout:GetLayout(format("%d-%s",def.mode,def.view))
            def = rematch.layout:GetDefinition(layoutName)
        end
    end

    return layoutName,def
end

-- anchors chrome frames
local function anchorChrome(layoutName,def)
    local chromeHeight,chromeYOffset
    if def.mode==0 then -- toolbar at bottom always minimized and never in 3-panel mode
        chromeHeight = C.TOOLBAR_HEIGHT + 5
        chromeYOffset = C.TOOLBAR_HEIGHT + 5
        rematch.toolbar:SetPoint("TOPLEFT",rematch.frame.Canvas,"BOTTOMLEFT",0,-2)
        rematch.toolbar:SetPoint("BOTTOMRIGHT",rematch.frame.Canvas,"BOTTOMRIGHT",0,-C.TOOLBAR_HEIGHT-2)
        rematch.bottombar:Hide()
    else
        chromeHeight = C.TOOLBAR_HEIGHT + 2 + C.BOTTOMBAR_HEIGHT + 2
        chromeYOffset = C.BOTTOMBAR_HEIGHT + 2
        rematch.toolbar:SetPoint("TOPLEFT",rematch.frame.Canvas,"TOPLEFT",0,C.TOOLBAR_HEIGHT+2)
        rematch.toolbar:SetPoint("BOTTOMRIGHT",rematch.frame.Canvas,"TOPRIGHT",0,2)
        rematch.bottombar:SetPoint("TOPLEFT",rematch.frame.Canvas,"BOTTOMLEFT",0,-2)
        rematch.bottombar:SetPoint("BOTTOMRIGHT",rematch.frame.Canvas,"BOTTOMRIGHT",0,-C.BOTTOMBAR_HEIGHT-2)
        rematch.bottombar:Show()
    end
    return chromeHeight,chromeYOffset
end


-- anchors panels to the canvas for the given layout
local function applyLayout(layoutName,def)
    -- hide all known panels that aren't used in this layout definition
    rematch.layout:HidePanels(def)

    -- set size of canvas from layout definition
    rematch.frame.Canvas:SetSize(def.width,def.height)

    -- anchor and show all panels that are in this layout definition
    for _,info in ipairs(def.panels) do
        local panel = rematch.frame[info[1]]
        if panel then -- we've already asserted all elements of the panel are defined when registering
            panel:SetPoint(info[2],rematch.frame[info[3]],info[4],info[5],info[6])
            panel:SetPoint(info[7],rematch.frame[info[8]],info[9],info[10],info[11])
            panel:Show()
        end
    end

    -- saving layouts
    settings.CurrentLayout = def.layoutName -- regardless of journal/standalone, save new layout
    if rematch.journal:IsActive() then -- if in journal, save new journal layout
        settings.JournalLayout = def.layoutName
        settings.LastOpenLayout = def.layoutName
        settings.LastOpenJournal = true
    else -- not in journal
        settings.StandaloneLayout = def.layoutName -- regardless of minimize state, save standalone layout
        if def.mode~=0 then
            settings.MaximizedLayout = def.layoutName -- for unminimized views, saved maximized layout
            settings.LastOpenLayout = def.layoutName
            settings.LastOpenJournal = false
        end
    end
end

-- runs the Configure/Resize/Update function for all chrome and all panels used in the layout definition
local function runFrameFuncs(func,def)
    for _,chrome in ipairs(chromeModules) do
        if rematch[chrome] and type(rematch[chrome][func])=="function" then
            rematch[chrome][func](rematch[chrome])
        end
    end
    -- then again for panels that are used
    for _,module in ipairs(modules) do
        if def.panelsUsed[module] then
            if type(module[func])=="function" then
                module[func](module)
            end
        end
    end
    if frameFuncEvents[func] then
        rematch.events:Fire(frameFuncEvents[func])
    end
end

-- can call this without any parameter to re-configure current layout; or pass a layoutName to configure
-- to the given layout (it's ok if layout is slightly off like 3-pets, it will adjust to a valid layout if possible)
function rematch.frame:Configure(newLayoutName)

    -- validate/adjust layoutName,definition
    local layoutName,def = negotiateLayout(newLayoutName)
    if layoutName and def then

        rematch.utils:HideWidgets()

        -- handle the toolbar and bottombar
        local chromeHeight,chromeYOffset = anchorChrome(layoutName,def)
        -- size the parent frame based on the canvas size of the layout
        rematch.frame:SetSize(def.width + C.FRAME_LEFT_MARGIN + C.FRAME_RIGHT_MARGIN, def.height + C.FRAME_TOP_MARGIN + C.FRAME_BOTTOM_MARGIN + chromeHeight)
        -- position canvas; for now ignoring toolbar and bottombuttons
        rematch.frame.Canvas:SetPoint("BOTTOMLEFT",rematch.frame,"BOTTOMLEFT",C.FRAME_LEFT_MARGIN,3+chromeYOffset)
        -- apply the layout (position frames)
        applyLayout(layoutName,def)
        -- run config/resize/update for all chrome and used panels
        runFrameFuncs("Configure",def)
        runFrameFuncs("Resize",def)
        runFrameFuncs("Update",def)
        -- anchor frame depending on saved
        if rematch.journal:IsActive() then
            rematch.frame:ClearAllPoints()
            rematch.frame:SetPoint("BOTTOMLEFT",CollectionsJournal,"BOTTOMLEFT",-1,0)
        else
            rematch.frame:RestorePosition()
            rematch.frame:SetFrameStrata(settings.LowerStrata and "LOW" or "MEDIUM")
        end
    else
        assert(false,"Layout "..(newLayoutName or "nil").." can't resolve to valid layout.")
    end
    rematch.frame:UpdateScale()
    self:EnableMouse(not rematch.journal:IsActive())
end

-- runs resize and update funcs for all chrome and all panels used in current layout
function rematch.frame:Resize()
    local def = rematch.layout:GetDefinition(C.CURRENT)
    runFrameFuncs("Resize",def)
    runFrameFuncs("Update",def)
end

-- runs update for all chrome and all panels used in current layout
function rematch.frame:Update()
    local def = rematch.layout:GetDefinition(C.CURRENT)
    runFrameFuncs("Update",def)
    if rematch.petCard:IsVisible() then
        rematch.petCard:Update()
    end
end

--[[ anchoring ]]

-- saves the current position of the frame with respect to its anchor in settings
function rematch.frame:SavePosition()
    if not self:IsVisible() or not self:GetLeft() or rematch.journal:IsActive() then
        return -- only save position if it's on screen, anchored and not in journal mode
    end
    local anchor = settings.Anchor
    if anchor=="BOTTOMLEFT" then
        settings.XPos,settings.YPos = self:GetLeft(),self:GetBottom()
    elseif anchor=="TOPLEFT" then
        settings.XPos,settings.YPos = self:GetLeft(),self:GetTop()
    elseif anchor=="TOP" then
        settings.XPos,settings.YPos = (self:GetCenter()),self:GetTop()
    elseif anchor=="TOPRIGHT" then
        settings.XPos,settings.YPos = self:GetRight(),self:GetTop()
    elseif anchor=="BOTTOMRIGHT" then
        settings.XPos,settings.YPos = self:GetRight(),self:GetBottom()
    elseif anchor=="BOTTOM" then
        settings.XPos,settings.YPos = (self:GetCenter()),self:GetBottom()
    end
end

-- called when frame configured or shown, it positions the frame to savedsettings, or saves position if none saved
function rematch.frame:RestorePosition()
    if settings.XPos and settings.YPos then
        self:ClearAllPoints()
        self:SetPoint(settings.Anchor,UIParent,"BOTTOMLEFT",settings.XPos,settings.YPos)
    else
        self:SavePosition()
    end
end

-- changes the Anchor setting to one of "BOTTOMLEFT", "TOPLEFT", "TOP", "TOPRIGHT", "BOTTOMRIGHT" or "BOTTOM"
function rematch.frame:ChangeAnchor(anchor)
    assert(anchor=="BOTTOMLEFT" or anchor=="TOPLEFT" or anchor=="TOP" or anchor=="TOPRIGHT" or anchor=="BOTTOMRIGHT" or anchor=="BOTTOM","Anchor "..(anchor or nil).." is invalid.")
    rematch.settings.Anchor = anchor
    rematch.settings.PanelTabAnchor = anchor
    if rematch.frame:IsVisible() and not rematch.journal:IsActive() then
        rematch.frame:SavePosition()
        rematch.frame:Configure(C.CURRENT)
    end
end

function rematch.frame:ChangePanelTabAnchor(anchor)
    assert(anchor=="BOTTOMLEFT" or anchor=="TOPLEFT" or anchor=="TOP" or anchor=="TOPRIGHT" or anchor=="BOTTOMRIGHT" or anchor=="BOTTOM","Anchor "..(anchor or nil).." is invalid.")
    rematch.settings.PanelTabAnchor = anchor
    if rematch.frame:IsVisible() and not rematch.journal:IsActive() then
        rematch.frame:Configure(C.CURRENT)
    end
end

-- only standalone window can scale; call this for each configure and when scale settings change
function rematch.frame:UpdateScale()
    if settings.CustomScale and not rematch.journal:IsActive() then
        local scale = max(50,min(tonumber(settings.CustomScaleValue) or 100,200))/100
        rematch.frame:SetScale(scale)
    else
        rematch.frame:SetScale(1)
    end
    if rematch.frame:IsVisible() then
        rematch.frame:SavePosition()
    end
end