local LevelWeatherManager = {}
local private = {}
local EventSystem = require('Event/EventSystem')

local DefaultDuration = 3 -- 默认过渡时长为3秒

-- 该模块仅适用事件调用
function LevelWeatherManager.OnStartup()
	EventSystem.Regist(EventID.Level_ClearLevel, private.ClearWeatherInfoList)
	EventSystem.Regist(EventID.Task_ChangeWeather, private.ChangeWeatherByDoingTask)
	EventSystem.Regist(EventID.LevelWeather_GlobalSwitchWeather, private.LevelItemGlobalSwitchWeather)
	EventSystem.Regist(EventID.LevelWeather_EnterLevelSwitchWeather, private.EnterLevelSwitchWeather)

	-- 切换天气队列 value = {weatherId, duration}
	private.weatherInfoList = {}
	private.curAutoSwitchLevelId = 0
end

function private.EnterLevelSwitchWeather()
	-- 重置天气记录场景
	private.curAutoSwitchLevelId = 0 
	-- 根据当前任务切换
	private.ChangeWeatherByDoingTask()
end

-- 根据任务切换天气
function private.ChangeWeatherByDoingTask()
	-- 取消自动切换天气
	private.StopAutoSwitchWeather()
	-- 根据任务切换天气
	local weatherInfo = MDL.Task.GetWeatherChangedInfo()
	local curlevelID = BattleDataGetter.GetCurLevelID()
	-- 优先切换任务所附带天气
	if weatherInfo then
		for i = 1, #weatherInfo, 2 do
			local levelID = weatherInfo[i]
			local weatherID = weatherInfo[i + 1]
			if curlevelID == levelID then --必须切换到当前地图才可以更换天气
				private.SwitchWeather(weatherID, DefaultDuration)
				return
			end
		end
	end
	-- 主线、金将、彩金。不走时间切换
	if MDL.Task.GetTaskCountByType(MDL.Task.Enum_TaskType.Major) > 0 or
		MDL.Task.GetTaskCountByType(MDL.Task.Enum_TaskType.GoldHeroActivity) > 0 or
		MDL.Task.GetTaskCountByType(MDL.Task.Enum_TaskType.SuperGoldHero) > 0 then

		local success, levelWeatherData = DataSheetManager.LevelWeatherData:TryGetDataByLevelWeatherID(curlevelID)
		if success then
			private.SwitchWeather(levelWeatherData.UseDefaultWeather, 0)
		end
		return
	end

	-- 任务不切换时 进行自动切换
	if BattleDataGetter.IsTownLevel() then
		private.AutoSwitchWeather()
	end
end

-- 根据关卡数据切换天气
function private.LevelItemGlobalSwitchWeather(weatherId, duration)
	-- 取消自动切换天气
	private.StopAutoSwitchWeather()
	-- 根据关卡数据切换天气
	if duration ~= nil then
		private.SwitchWeather(weatherId, duration)
	else
		private.SwitchWeather(weatherId, DefaultDuration)
	end
end

-- 场景中自动切换天气
function private.AutoSwitchWeather()
	-- 取消自动切换天气
	private.StopAutoSwitchWeather()
	-- 根据场景地图切换天气
	local curlevelID = BattleDataGetter.GetCurLevelID()
	local _, levelWeatherData = DataSheetManager.LevelWeatherData:TryGetDataByLevelWeatherID(curlevelID)
	if not levelWeatherData then return end

	local curTimeStamp = UTL.Time.GetServerTimestamp()
	local serverZeroTimestamp = UTL.Time.GetServerZeroTimestamp()

	local nextSwitchTime = serverZeroTimestamp + UTL.Time.TotalSecondsOneDay + levelWeatherData.WratherChangeData[1] -- 将下一次切换事件默认设置为下一天的第一个时间点
	local switchWeatherId = levelWeatherData.WeatherParam[#levelWeatherData.WeatherParam]
	for index, timeOffset in ipairs(levelWeatherData.WratherChangeData) do
		if curTimeStamp >= serverZeroTimestamp + timeOffset then
			switchWeatherId = levelWeatherData.WeatherParam[index]
		else
			nextSwitchTime = serverZeroTimestamp + timeOffset
			break
		end
	end
	-- 切换天气
	if curlevelID == private.curAutoSwitchLevelId then -- 如果所在场景和上一次自动切换天气场景一致则 过渡切换
		private.SwitchWeather(switchWeatherId, DefaultDuration)
	else
		private.SwitchWeather(switchWeatherId, 0) -- 不一致 则直接切换
		private.curAutoSwitchLevelId = curlevelID
	end

	-- 设置下一次切换天气倒计时
	private.timerHandle = TimerUtil.Interval(private.AutoSwitchWeather, nextSwitchTime - curTimeStamp, 1)
end

-- 取消自动切换天气
function private.StopAutoSwitchWeather()
	if private.timerHandle then
		TimerUtil.Remove(private.timerHandle)
		private.timerHandle = nil
	end
end

-- 上一次切换天气未结束时 再次切换天气无效，所以使用队列切换
function private.SwitchWeather(weatherId, duration)
	if private.switchTimerHandle then
		table.insert(private.weatherInfoList, {weatherId = weatherId, duration = duration})
	else
		if AuxUtil.SwitchWeather(weatherId, duration) then
			private.switchTimerHandle = TimerUtil.Interval(private.SwitchWeatherTimeEnd, duration + 1, 1) -- 时间延迟1秒 防止极限情况下
		else
			logging.error(LTAG.ERROR, "[关卡策划注意] 切换天气失败，关卡ID：", LevelManager.GetCurLevelID(), "天气ID：", weatherId)
		end
	end
end

function private.SwitchWeatherTimeEnd()
	if private.switchTimerHandle then
		TimerUtil.Remove(private.switchTimerHandle)
		private.switchTimerHandle = nil
		local weatherInfo = table.remove(private.weatherInfoList, 1)
		if weatherInfo then
			private.SwitchWeather(weatherInfo.weatherId, weatherInfo.duration)
		end
	end
end

-- 清空天气切换队列
function private.ClearWeatherInfoList()
	if private.switchTimerHandle then
		TimerUtil.Remove(private.switchTimerHandle)
		private.switchTimerHandle = nil
	end
	table.clearArray(private.weatherInfoList)
end

return LevelWeatherManager