-- src/ServerScriptService/QuestManager.server.lua

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local QuestConfig = require(ReplicatedStorage:WaitForChild("Shared"):WaitForChild("QuestConfig"))
local QuestUpdateEvent = ReplicatedStorage:WaitForChild("Events"):WaitForChild("QuestUpdateEvent")
local NotificationEvent = ReplicatedStorage:WaitForChild("Events"):WaitForChild("NotificationEvent")

-- Player quest state: [userId] = { [questId] = { progress, completed } }
local playerQuests = {}

local function initPlayerQuests(player)
	playerQuests[player.UserId] = {}

	-- Assign starter quests
	for _, questId in ipairs(QuestConfig.StarterQuests) do
		playerQuests[player.UserId][questId] = {
			progress = 0,
			completed = false,
		}
	end

	-- Send initial quest data to client
	task.delay(4, function()
		if player.Parent then
			QuestUpdateEvent:FireClient(player, "Init", playerQuests[player.UserId])
		end
	end)
end

local function isQuestActive(player, questId)
	local quests = playerQuests[player.UserId]
	if not quests then return false end
	local quest = quests[questId]
	if not quest then return false end
	return not quest.completed
end

local function progressQuest(player, questType, amount)
	local quests = playerQuests[player.UserId]
	if not quests then return end

	for questId, questState in pairs(quests) do
		if questState.completed then continue end

		local questDef = QuestConfig.Quests[questId]
		if not questDef then continue end

		if questDef.Type == questType then
			questState.progress = questState.progress + amount

			if questState.progress >= questDef.Target then
				questState.progress = questDef.Target
				questState.completed = true

				-- Grant rewards
				if questDef.Reward.Cash then
					local leaderstats = player:FindFirstChild("leaderstats")
					if leaderstats then
						local cash = leaderstats:FindFirstChild("Cash")
						if cash then
							cash.Value = cash.Value + questDef.Reward.Cash
						end
					end
				end

				NotificationEvent:FireClient(player, "Quest Complete", questDef.Title .. " completed! +" .. tostring(questDef.Reward.Cash or 0) .. " Cash")

				-- Unlock follow-up quests
				unlockNextQuests(player, questId)
			end

			-- Update client
			QuestUpdateEvent:FireClient(player, "Update", {
				questId = questId,
				progress = questState.progress,
				target = questDef.Target,
				completed = questState.completed,
			})
		end
	end
end

function unlockNextQuests(player, completedQuestId)
	-- Simple linear progression: unlock quests based on what was completed
	local unlockMap = {
		ChopFirstTree = {"Chop10Trees"},
		Chop10Trees = {"Chop50Trees"},
		Chop50Trees = {"Chop200Trees"},
		SellFirstWood = {"Earn5000"},
		Earn5000 = {"Earn50000"},
		BuildFirstStructure = {"Build10Structures"},
		BuyFirstItem = {"ProcessFirstPlank"},
		ProcessFirstPlank = {"ExploreAllBiomes"},
	}

	local nextQuests = unlockMap[completedQuestId]
	if nextQuests then
		for _, nextId in ipairs(nextQuests) do
			if not playerQuests[player.UserId][nextId] then
				playerQuests[player.UserId][nextId] = {
					progress = 0,
					completed = false,
				}

				local questDef = QuestConfig.Quests[nextId]
				if questDef then
					NotificationEvent:FireClient(player, "New Quest", "New quest unlocked: " .. questDef.Title)
				end
			end
		end
	end
end

-- Expose globally for other managers to trigger quest progress
_G.ProgressQuest = function(player, questType, amount)
	progressQuest(player, questType, amount or 1)
end

_G.GetPlayerQuests = function(player)
	return playerQuests[player.UserId]
end

Players.PlayerAdded:Connect(initPlayerQuests)
Players.PlayerRemoving:Connect(function(player)
	playerQuests[player.UserId] = nil
end)

-- Handle players already in game
for _, player in ipairs(Players:GetPlayers()) do
	task.spawn(function()
		initPlayerQuests(player)
	end)
end