local _, addon = ...

local ITEM_CASH_REWARDS = {
	-- some items have hidden values, like pouches
	[45724] = 1e5, -- Champion's Purse, 10 gold
	[64491] = 2e6, -- Royal Reward, 200 gold

	-- items from the Sixtrigger brothers quest chain in Stormheim
	[138127] = 15, -- Mysterious Coin, 15 copper
	[138129] = 11, -- Swatch of Priceless Silk, 11 copper
	[138131] = 24, -- Magical Sprouting Beans, 24 copper
	[138123] = 15, -- Shiny Gold Nugget, 15 copper
	[138125] = 16, -- Crystal Clear Gemstone, 16 copper
	[138133] = 27, -- Elixir of Endless Wonder, 27 copper
}

local ignoredQuests = {}
local function isQuestIgnored(questID, title)
	local ignore
	if ignoredQuests[questID] then
		return true
	elseif addon:IsQuestIgnored(questID) then
		ignore = true
	elseif title and addon:IsQuestIgnored(title) then
		ignore = true
	elseif C_QuestLog.IsWorldQuest(questID) then
		-- these are usually always material delivery quests, don't want to waste that
		ignore = true
	elseif C_QuestLog.IsQuestTrivial(questID) and not C_Minimap.IsTrackingHiddenQuests() then
		ignore = true
	end

	if ignore then
		-- ignore this quest for the rest of the session, to avoid it being selected again
		ignoredQuests[questID] = true
		return true
	end
end

function addon:MINIMAP_UPDATE_TRACKING()
	-- the user _might_ have toggled the ignore tracking, wipe the session-ignored quests
	table.wipe(ignoredQuests)
end

local function handleGossipQuests()
	if addon:IsPaused() or addon:IsNPCIgnored() then
		return
	end

	if addon:GetOption('complete') then
		for _, questInfo in next, C_GossipInfo.GetActiveQuests() do
			if not questInfo.questLevel or questInfo.questLevel == 0 then
				-- not cached yet
				addon:WaitForQuestData(questInfo.questID, handleGossipQuests)
			elseif isQuestIgnored(questInfo.questID, questInfo.title) then
				-- ignore
			elseif questInfo.isComplete then
				C_GossipInfo.SelectActiveQuest(questInfo.questID)
			end
		end
	end

	if addon:GetOption('accept') then
		for _, questInfo in next, C_GossipInfo.GetAvailableQuests() do
			if not questInfo.questLevel or questInfo.questLevel == 0 then
				-- not cached yet
				addon:WaitForQuestData(questInfo.questID, handleGossipQuests)
			elseif questInfo.isRepeatable and not addon:GetOption('acceptRepeatables') then
				-- ignore
			elseif not isQuestIgnored(questInfo.questID, questInfo.title) then
				C_GossipInfo.SelectAvailableQuest(questInfo.questID)
			end
		end
	end
end

local function handleQuestList()
	if addon:IsPaused() or addon:IsNPCIgnored() then
		return
	end

	if addon:GetOption('complete') then
		for index = 1, GetNumActiveQuests() do
			local questID = GetActiveQuestID(index)
			local title, isComplete = GetActiveTitle(index)
			if isComplete and not isQuestIgnored(questID, title) then
				SelectActiveQuest(index)
			end
		end
	end

	if addon:GetOption('accept') then
		for index = 1, GetNumAvailableQuests() do
			local _, _, isRepeatable, _, questID = GetAvailableQuestInfo(index)
			local questLevel = GetAvailableLevel(index)
			if not questLevel or questLevel == 0 then
				-- not cached yet, invalid isTrivial flag
				addon:WaitForQuestData(questID, handleQuestList)
			elseif isQuestIgnored(questID, GetAvailableTitle(index)) then
				-- ignore
			elseif isRepeatable and not addon:GetOption('acceptRepeatables') then
				-- ignore
			else
				SelectAvailableQuest(index)
			end
		end
	end
end

local function handleQuestDetail()
	if addon:IsPaused() or addon:IsNPCIgnored() then
		return
	end

	local questID = GetQuestID()
	if not questID or questID == 0 then
		return
	end

	if not addon:GetOption('accept') then
		return
	end

	local questLevel = C_QuestLog.GetQuestDifficultyLevel(questID)
	if not questLevel or questLevel == 0 then
		addon:WaitForQuestData(questID, handleQuestDetail)
		return
	end

	if QuestGetAutoAccept() then
		-- these kinds of quests are already accepted, the popup only exists to notify the user
		AcknowledgeAutoAcceptQuest()
		RemoveAutoQuestPopUp(questID)
	elseif QuestIsFromAreaTrigger() then
		-- when not triggered in combination with QuestGetAutoAccept-style quests this is just
		-- a normal quest popup, as if it was shared by an unknown player, so we'll just accept it
		AcceptQuest()
	elseif not isQuestIgnored(questID) then
		AcceptQuest()
	end
end

local function handleQuestProgress()
	if addon:IsPaused() or addon:IsNPCIgnored() then
		return
	end

	if not IsQuestCompletable() or not addon:GetOption('complete') then
		return
	end

	local questID = GetQuestID()
	if ignoredQuests[questID] then
		return
	end

	-- make sure the quest doesn't contain an ignored item
	for index = 1, GetNumQuestItems() do
		local _, _, _, _, _, itemID = GetQuestItemInfo('required', index)
		if itemID then
			if addon:IsItemIgnored(itemID) then
				-- ignore this quest to prevent it from being selected again
				ignoredQuests[questID] = true
				return
			end
		end
	end

	CompleteQuest()
end

local function handleQuestComplete()
	local numChoices = GetNumQuestChoices()
	if numChoices <= 1 then
		if not addon:IsPaused() and addon:GetOption('complete') and not addon:IsNPCIgnored() and not isQuestIgnored(GetQuestID()) then
			GetQuestReward(1)
		end
	elseif addon:GetOption('selectreward') then
		local highestValue, highestValueIndex = 0
		for index = 1, numChoices do
			local _, _, _, _, _, itemID = GetQuestItemInfo('choice', index)
			local isCached, _, _, _, _, _, _, _, _, _, itemValue = C_Item.GetItemInfo(itemID)
			if not isCached then
				addon:WaitForItemData(itemID, handleQuestComplete)
			else
				itemValue = ITEM_CASH_REWARDS[itemID] or itemValue

				if itemValue > highestValue then
					highestValue = itemValue
					highestValueIndex = index
				end
			end
		end

		if highestValueIndex then
			-- "intrusive" action
			QuestInfoItem_OnClick(QuestInfoRewardsFrame.RewardButtons[highestValueIndex])
		end
	end
end

local function handleQuestPopup()
	if addon:IsPaused() then
		return
	end

	if WorldMapFrame:IsShown() then
		-- https://github.com/p3lim-wow/QuickQuest/issues/45
		return
	end

	if QuestFrame:IsShown() then
		-- don't try to deal with quests while we already deal with one
		return
	end

	local numPopups = GetNumAutoQuestPopUps()
	if numPopups == 0 then
		return
	end

	if UnitIsDeadOrGhost('player') then
		-- can't accept quests while dead
		if not addon:IsUnitEventRegistered('PLAYER_FLAGS_CHANGED', 'player', handleQuestPopup) then
			-- TODO: should probably unregister this afterwards
			addon:RegisterUnitEvent('PLAYER_FLAGS_CHANGED', 'player', handleQuestPopup)
		end
		return
	end

	for index = 1, numPopups do
		local questID, questType = GetAutoQuestPopUp(index)
		if questType == 'OFFER' and addon:GetOption('accept') then
			ShowQuestOffer(questID)
		elseif questType == 'COMPLETE' and addon:GetOption('complete') then
			ShowQuestComplete(questID)
		end
	end
end

addon:RegisterEvent('GOSSIP_SHOW', handleGossipQuests) -- quest list with gossips
addon:RegisterEvent('QUEST_GREETING', handleQuestList) -- quest list without gossips
addon:RegisterEvent('QUEST_DETAIL', handleQuestDetail) -- quest details before accepting
addon:RegisterEvent('QUEST_PROGRESS', handleQuestProgress) -- quest details when delivering
addon:RegisterEvent('QUEST_COMPLETE', handleQuestComplete) -- quest details when completing
addon:RegisterEvent('QUEST_LOG_UPDATE', handleQuestPopup) -- popups

function addon:QUEST_ACCEPTED(questID)
	if addon:GetOption('share') then
		local questLogIndex = C_QuestLog.GetLogIndexForQuestID(questID)
		if questLogIndex then
			-- no way to check if the user _can_ share it, we'll just try to share it
			QuestLogPushQuest(questLogIndex)
		end
	end
end

function addon:QUEST_ACCEPT_CONFIRM(_, questTitle)
	-- triggered when a quest is shared but requires confirmation (like escorts)
	-- XXX: no way to get questID from this?
	if not addon:IsPaused() and addon:GetOption('accept') then
		if not addon:IsQuestIgnored(questTitle) then
			ConfirmAcceptQuest()
		end
	end
end