-----------------------------------------------------------------------
-- AddOn namespace.
-----------------------------------------------------------------------
local LibStub = _G.LibStub
local ADDON_NAME, private = ...

local RSEventHandler = private.NewLib("RareScannerEventHandler")

-- RareScanner database libraries
local RSConfigDB = private.ImportLib("RareScannerConfigDB")
local RSGeneralDB = private.ImportLib("RareScannerGeneralDB")
local RSMapDB = private.ImportLib("RareScannerMapDB")
local RSNpcDB = private.ImportLib("RareScannerNpcDB")
local RSContainerDB = private.ImportLib("RareScannerContainerDB")
local RSAchievementDB = private.ImportLib("RareScannerAchievementDB")
local RSCollectionsDB = private.ImportLib("RareScannerCollectionsDB")

-- RareScanner services
local RSMinimap = private.ImportLib("RareScannerMinimap")

-- RareScanner internal libraries
local RSConstants = private.ImportLib("RareScannerConstants")
local RSLogger = private.ImportLib("RareScannerLogger")
local RSUtils = private.ImportLib("RareScannerUtils")


---============================================================================
-- Handle entities without vignette
---============================================================================

local function HandleEntityWithoutVignette(rareScannerButton, unitID)
	if (not unitID) then
		return
	end
	
	local unitGuid = UnitGUID(unitID)
	if (not unitGuid) then
		return
	end
	
	local unitType, _, _, _, _, entityID = strsplit("-", unitGuid)
	if (unitType == "Creature" or unitType == "Vehicle") then
		local npcID = entityID and tonumber(entityID) or nil
	
		-- If player in a zone with vignettes ignore it
		local mapID = C_Map.GetBestMapForUnit("player")
		local inInstance, _ = IsInInstance()
		
		-- Check if NPC in dungeon, in wich case we get fake mapIDs
		if (not mapID or inInstance) then
			local npcInfo = RSNpcDB.GetInternalNpcInfo(npcID)
			if (npcInfo and npcInfo.zoneID and private.DUNGEONS_IDS[npcInfo.zoneID]) then
				local nameplateUnitName, _ = UnitName(unitID)
				rareScannerButton:SimulateRareFound(npcID, unitGuid, nameplateUnitName, 0, 0, RSConstants.NPC_VIGNETTE)
			end
			
			return
		end
		
		-- If its a supported NPC and its not killed
		if (RSGeneralDB.GetAlreadyFoundEntity(npcID) or RSNpcDB.GetInternalNpcInfo(npcID)) then
			-- Ignore if dead
			if (UnitIsDead(unitID)) then
				return
			end
		
			local nameplateUnitName, _ = UnitName(unitID)
			if (not nameplateUnitName or nameplateUnitName == UNKNOWNOBJECT) then
				nameplateUnitName = RSNpcDB.GetNpcName(npcID)
			end
			
			local x, y = RSNpcDB.GetBestInternalNpcCoordinates(npcID, mapID)
			rareScannerButton:SimulateRareFound(npcID, unitGuid, nameplateUnitName, x, y, RSConstants.NPC_VIGNETTE)
		end
	elseif (unitType == "Object") then
		local containerID = entityID and tonumber(entityID) or nil
		-- If the container didn't have a vignette this is the last chance to get the name
		if (RSContainerDB.GetInternalContainerInfo(containerID) and not RSContainerDB.GetContainerName(containerID)) then
			local containerName = UnitName(unitID)
			if (containerName) then
				RSContainerDB.SetContainerName(containerName)
			end
		end
	end
end

---============================================================================
-- Event: NAME_PLATE_UNIT_ADDED
-- Fired when a nameplate appears
---============================================================================

local function OnNamePlateUnitAdded(rareScannerButton, namePlateID)
	if (namePlateID and not UnitIsUnit("player", namePlateID)) then
		HandleEntityWithoutVignette(rareScannerButton, namePlateID)
	end
end

---============================================================================
-- Event: UPDATE_MOUSEOVER_UNIT
-- Fired when mouseovering a unit
---============================================================================

local function OnUpdateMouseoverUnit(rareScannerButton)
	if (not UnitIsUnit("player", "mouseover") and not UnitIsDead("mouseover")) then
		HandleEntityWithoutVignette(rareScannerButton, "mouseover")
	end
end

---============================================================================
-- Event: PLAYER_REGEN_ENABLED
-- Fired when the player leaves combat
---============================================================================

local function OnPlayerRegenEnabled(rareScannerButton)
	if (rareScannerButton.pendingToShow) then
		rareScannerButton.pendingToShow = nil
		rareScannerButton.pendingToHide = nil -- just in case it was pending too
		rareScannerButton:ShowButton()
	elseif (rareScannerButton.pendingToHide) then
		rareScannerButton.pendingToHide = nil
		rareScannerButton:HideButton()
	end
end

---============================================================================
-- Event: PLAYER_TARGET_CHANGED
-- Fired when changing the target
---============================================================================

local function OnPlayerTargetChanged(rareScannerButton)
	if (UnitExists("target")) then
		local targetUid = UnitGUID("target")
		local npcType, _, _, _, _, id = strsplit("-", targetUid)
		local npcID = id and tonumber(id) or nil

		-- Ignore rare hunter pets
		if (npcType == "Pet") then
			return
		end
		
		-- Ignore if no ID found
		if (not npcID) then
			return
		end
		
		-- Simulate found
		if (RSNpcDB.GetInternalNpcInfo(npcID)) then
			HandleEntityWithoutVignette(rareScannerButton, "target")
		end
	end	
end

---============================================================================
-- Event: LOOT_OPENED
-- Fired when looting some entity
---============================================================================

local function OnLootOpened()
	local numItems = GetNumLootItems()
	if (not numItems or numItems <= 0) then
		return
	end

	local looted = false
	for i = 1, numItems do
		if (LootSlotHasItem(i)) then
			local destGUID = GetLootSourceInfo(i)
			local unitType, _, _, _, _, id = strsplit("-", destGUID)

			-- If the loot comes from a container that we support
			if (unitType == "GameObject") then
				local containerID = id and tonumber(id) or nil
				--RSLogger:PrintDebugMessage(string.format("Abierto [%s].", containerID or ""))

				-- We support all the containers with vignette plus those ones that are part of achievements (without vignette)
				if (RSGeneralDB.GetAlreadyFoundEntity(containerID) or RSContainerDB.GetInternalContainerInfo(containerID)) then
					-- Sets the container as opened
					-- We are looping through all the items looted, we dont want to call this method with every item
					if (not looted) then
				
						-- Check if we have the Container in our database but the addon didnt detect it
						-- This will happend in the case where the container doesnt have a vignette
						if (not RSGeneralDB.GetAlreadyFoundEntity(containerID)) then
							RSGeneralDB.AddAlreadyFoundContainerWithoutVignette(containerID)
						else
							RSGeneralDB.UpdateAlreadyFoundEntityPlayerPosition(containerID)
						end
					
						looted = true
					end

					-- Records the loot obtained
					local itemLink = GetLootSlotLink(i)
					if (itemLink) then
						local _, _, _, lootType, id, _, _, _, _, _, _, _, _, _, name = string.find(itemLink, "|?c?f?f?(%x*)|?H?([^:]*):?(%d+):?(%d*):?(%d*):?(%d*):?(%d*):?(%d*):?(%-?%d*):?(%-?%d*):?(%d*):?(%d*)|?h?%[?([^%[%]]*)%]?|?h?|?r?")
						if (lootType == "item") then
							local itemID = id and tonumber(id) or nil
							RSContainerDB.AddItemToContainerLootFound(containerID, itemID)
						end
					end
				end
			-- If the loot comes from a creature that we support
			elseif (unitType == "Creature") then
				local npcID = id and tonumber(id) or nil
				
				-- If its a supported NPC
				if (RSGeneralDB.GetAlreadyFoundEntity(npcID) or RSNpcDB.GetInternalNpcInfo(npcID)) then
					local itemLink = GetLootSlotLink(i)
					if (itemLink) then
						local _, _, _, lootType, id, _, _, _, _, _, _, _, _, _, name = string.find(itemLink, "|?c?f?f?(%x*)|?H?([^:]*):?(%d+):?(%d*):?(%d*):?(%d*):?(%d*):?(%d*):?(%-?%d*):?(%-?%d*):?(%d*):?(%d*)|?h?%[?([^%[%]]*)%]?|?h?|?r?")
						if (lootType == "item") then
							local itemID = id and tonumber(id) or nil
							RSNpcDB.AddItemToNpcLootFound(npcID, itemID)
						end
					end
				end
			end
		end
	end
end

---============================================================================
-- Event: CINEMATIC_START
-- Fired when a cinematic starts
---============================================================================

local isCinematicPlaying = false
local function OnCinematicStart(rareScannerButton)
	isCinematicPlaying = true
	if (rareScannerButton:IsVisible()) then
		rareScannerButton:HideButton()
	end
end

---============================================================================
-- Event: CINEMATIC_STOP
-- Fired when a cinematic stops
---============================================================================

local function OnCinematicStop(rareScannerButton)
	isCinematicPlaying = false
end

function RSEventHandler.IsCinematicPlaying()
	return isCinematicPlaying
end

---============================================================================
-- Event: NEW_MOUNT_ADDED
-- Fired when a new mount is added to the collection
---============================================================================

local function OnNewMountAdded(mountID)
	RSCollectionsDB.RemoveNotCollectedMount(mountID, function()
		RSExplorerFrame:Refresh()
	end)
end

---============================================================================
-- Event: NEW_PET_ADDED
-- Fired when a new pet is added to the collection
---============================================================================

local function OnNewPetAdded(petGUID)
	RSCollectionsDB.RemoveNotCollectedPet(petGUID, function()
		RSExplorerFrame:Refresh()
	end)
end

---============================================================================
-- Event: NEW_TOY_ADDED
-- Fired when a new toy is added to the collection
---============================================================================

local function OnNewToyAdded(itemID)
	RSCollectionsDB.RemoveNotCollectedToy(itemID, function()
		RSExplorerFrame:Refresh()
	end)
end

---============================================================================
-- Event: CRITERIA_EARNED
-- Fired when a part of an achievement is earned
---============================================================================

local function OnCriteriaEarned(parentAchievementID, description)
	if (parentAchievementID) then
		-- Update achievements cache
		RSAchievementDB.RefreshAchievementCache(parentAchievementID)
	end
end

---============================================================================
-- Event: PLAYER_LOGIN
-- Fired when the player logs in the game
---============================================================================

local function OnPlayerLogin(rareScannerButton)
	local x, y = RSGeneralDB.GetButtonPositionCoordinates()
	if (x and y) then
		rareScannerButton:ClearAllPoints()
		rareScannerButton:SetPoint("BOTTOMLEFT", x, y)
	end
	
	rareScannerButton:UnregisterEvent("PLAYER_LOGIN")
end

---============================================================================
-- Event handler
---============================================================================

local function HandleEvent(rareScannerButton, event, ...) 
	if (event == "PLAYER_LOGIN") then
		OnPlayerLogin(rareScannerButton)
	elseif (event == "NAME_PLATE_UNIT_ADDED") then
		OnNamePlateUnitAdded(rareScannerButton, ...)
	elseif (event == "UPDATE_MOUSEOVER_UNIT") then
		OnUpdateMouseoverUnit(rareScannerButton)
	elseif (event == "PLAYER_REGEN_ENABLED") then
		OnPlayerRegenEnabled(rareScannerButton)
	elseif (event == "PLAYER_TARGET_CHANGED") then
		OnPlayerTargetChanged(rareScannerButton)
	elseif (event == "LOOT_OPENED") then
		OnLootOpened()
	elseif (event == "CINEMATIC_START") then
		OnCinematicStart(rareScannerButton)
	elseif (event == "CINEMATIC_STOP") then
		OnCinematicStop()
	elseif (event == "NEW_MOUNT_ADDED") then
		OnNewMountAdded(...)
	elseif (event == "NEW_PET_ADDED") then
		OnNewPetAdded(...)
	elseif (event == "NEW_TOY_ADDED") then
		OnNewToyAdded(...)
	elseif (event == "CRITERIA_EARNED") then
		OnCriteriaEarned(...)
	end
end

function RSEventHandler.RegisterEvents(rareScannerButton, addon)
	RareScanner = addon
	rareScannerButton:RegisterEvent("PLAYER_LOGIN")
	rareScannerButton:RegisterEvent("NAME_PLATE_UNIT_ADDED")
	rareScannerButton:RegisterEvent("UPDATE_MOUSEOVER_UNIT")
	rareScannerButton:RegisterEvent("PLAYER_REGEN_ENABLED")
	rareScannerButton:RegisterEvent("PLAYER_TARGET_CHANGED")
	rareScannerButton:RegisterEvent("LOOT_OPENED")
	rareScannerButton:RegisterEvent("CINEMATIC_START")
	rareScannerButton:RegisterEvent("CINEMATIC_STOP")
	rareScannerButton:RegisterEvent("NEW_MOUNT_ADDED")
	rareScannerButton:RegisterEvent("NEW_PET_ADDED")
	rareScannerButton:RegisterEvent("NEW_TOY_ADDED")
	rareScannerButton:RegisterEvent("CRITERIA_EARNED")

	-- Captures all events
	rareScannerButton:SetScript("OnEvent", function(self, event, ...)
		HandleEvent(self, event, ...) 
	end)
end