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local Players = game:GetService("Players")
local ServerStorage = game:GetService("ServerStorage")
local CollectionService = game:GetService("CollectionService")
local RunService = game:GetService("RunService")
local TweenService = game:GetService("TweenService")
local Settings = require(game.ReplicatedStorage.Settings)

local stages = ServerStorage.Stages
local lobbySpawn = workspace.Lobby.SpawnLocation
local tower = nil
local towerStages = {}
local lava = nil
local finished = {}

print("Each tower has " .. Settings.StageCount .. " stages")

-- Jeder Spieler erhält Wins und Stage auf der Bestenliste
Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player

	local wins = Instance.new("IntValue")
	wins.Name = "Wins"
	wins.Parent = leaderstats

	local stage = Instance.new("IntValue")
	stage.Name = "Stage"
	stage.Parent = leaderstats

	-- Ein Spieler, der herunterfällt, startet erneut auf der letzten erreichten Stage,
	-- es sei denn, die Lava hat sie bedeckt: Dann wartet er in der Lobby
	player.CharacterAdded:Connect(function(character)
		task.wait()
		local checkpoint = towerStages[stage.Value]
		local covered = checkpoint and lava and checkpoint.Start.Position.Y < lava.Position.Y + lava.Size.Y / 2
		if checkpoint and not covered and not finished[player] then
			character:PivotTo(checkpoint.Start.CFrame + Vector3.new(0, 4, 0))
		end
	end)
end)

-- Die Anzeigetafel in der Lobby
local gui = Instance.new("SurfaceGui")
gui.Parent = workspace.Lobby.Board

local boardLabel = Instance.new("TextLabel")
boardLabel.Name = "Status"
boardLabel.Size = UDim2.fromScale(1, 1)
boardLabel.BackgroundColor3 = Color3.fromRGB(25, 25, 35)
boardLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
boardLabel.TextScaled = true
boardLabel.Text = "Endless Tower"
boardLabel.Parent = gui

local function setBoard(text)
	boardLabel.Text = text
end

-- Alles mit dem Tag Kill beendet ein Leben
local function killOnTouch(hit)
	local humanoid = hit.Parent:FindFirstChild("Humanoid")
	if humanoid then
		humanoid.Health = 0
	end
end

-- Eine verschwindende Stufe verblasst kurz, nachdem jemand darauf landet, und erscheint dann wieder
local function makeVanish(part)
	part.Touched:Connect(function(hit)
		if part:GetAttribute("Gone") or not hit.Parent:FindFirstChild("Humanoid") then
			return
		end
		part:SetAttribute("Gone", true)
		task.wait(Settings.VanishDelay)
		part.Transparency = 0.8
		part.CanCollide = false
		task.wait(Settings.VanishTime)
		part.Transparency = 0
		part.CanCollide = true
		part:SetAttribute("Gone", nil)
	end)
end

-- Ein Laser gleitet zu seinem Slide-Versatz und zurück, immer wieder
local function makeSlide(part)
	local info = TweenInfo.new(Settings.SlideTime, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut, -1, true)
	local goal = { Position = part.Position + part:GetAttribute("Slide") }
	TweenService:Create(part, info, goal):Play()
end

-- Ein Sprungfeld schleudert jeden, der darauf landet, in die Luft
local function bounce(hit)
	local root = hit.Parent:FindFirstChild("HumanoidRootPart")
	if root then
		root.AssemblyLinearVelocity = Vector3.new(0, Settings.BouncePower, 0)
	end
end

-- Spinners drehen sich bei jedem Frame ein Stück
RunService.Heartbeat:Connect(function(dt)
	for _, spinner in CollectionService:GetTagged("Spinner") do
		if spinner:IsDescendantOf(workspace) then
			spinner:PivotTo(spinner:GetPivot() * CFrame.Angles(0, math.rad(Settings.SpinSpeed) * dt, 0))
		end
	end
end)

-- Aktiviere alle Hindernisse in einer Stage anhand ihrer Tags
local function setupStage(stage, index)
	for _, part in stage:GetDescendants() do
		if part:HasTag("Kill") then
			part.Touched:Connect(killOnTouch)
		end
		if part:HasTag("Vanish") then
			makeVanish(part)
		end
		if part:HasTag("Conveyor") then
			part.AssemblyLinearVelocity = part.CFrame.LookVector * Settings.BeltSpeed
		end
		if part:HasTag("Slider") then
			makeSlide(part)
		end
		if part:HasTag("Bounce") then
			part.Touched:Connect(bounce)
		end
	end
	-- Das Erreichen von Start einer Stage wird auf der Bestenliste erfasst
	stage.Start.Touched:Connect(function(hit)
		local player = Players:GetPlayerFromCharacter(hit.Parent)
		if player and player.leaderstats.Stage.Value < index then
			player.leaderstats.Stage.Value = index
		end
	end)
end

-- Weiter oben liegen schwierigere Stages: Das untere Drittel ist leicht, das obere schwer
local function pickStage(index)
	local difficulty = math.ceil(index / Settings.StageCount * 3)
	local choices = {}
	for _, stage in stages:GetChildren() do
		if stage:GetAttribute("Difficulty") == difficulty then
			table.insert(choices, stage)
		end
	end
	return choices[math.random(1, #choices)]
end

-- Platziere eine Kopie eines Modells oben auf dem Turm; gibt die Kopie und die neue Turmspitze zurück
local function stack(template, bottom)
	local copy = template:Clone()
	local box, size = copy:GetBoundingBox()
	local lift = bottom - (box.Position.Y - size.Y / 2)
	copy:PivotTo(copy:GetPivot() + Vector3.new(0, lift, 0))
	copy.Parent = tower
	return copy, bottom + size.Y
end

-- Die Spitze des Turms: ein Sieg, dann zurück zur Lobby
local function reachTop(hit)
	local player = Players:GetPlayerFromCharacter(hit.Parent)
	if not player or finished[player] then
		return
	end
	finished[player] = true
	player.leaderstats.Wins.Value += 1
	-- Lektion 19: Best Times kommt hierhin
	print(player.Name .. " reached the top")
	hit.Parent:PivotTo(lobbySpawn.CFrame + Vector3.new(0, 4, 0))
end

-- Baue einen neuen zufälligen Turm von unten nach oben
local function buildTower()
	tower = Instance.new("Model")
	tower.Name = "Tower"
	tower.Parent = workspace
	towerStages = {}
	local top = 0
	for i = 1, Settings.StageCount do
		local stage, newTop = stack(pickStage(i), top)
		top = newTop
		setupStage(stage, i)
		towerStages[i] = stage
	end
	local finish = stack(ServerStorage.Finish, top)
	finish.FinishPad.Touched:Connect(reachTop)
	return top
end

-- Die Lava steigt vom Boden bis knapp unter die Spitze des Turms
local function startLava(top)
	lava = Instance.new("Part")
	lava.Name = "Lava"
	lava.Anchored = true
	lava.CanCollide = false
	lava.Size = Vector3.new(30, 2, 30)
	lava.Position = Vector3.new(0, -2, 0)
	lava.Color = Color3.fromRGB(255, 90, 20)
	lava.Material = Enum.Material.Neon
	lava.Parent = workspace
	lava.Touched:Connect(killOnTouch)
	local info = TweenInfo.new(top / Settings.LavaSpeed, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut, 0, false, Settings.LavaDelay)
	TweenService:Create(lava, info, { Position = Vector3.new(0, top - 2, 0) }):Play()
end

local function startRound()
	finished = {}
	for _, player in Players:GetPlayers() do
		player.leaderstats.Stage.Value = 0
	end
	local top = buildTower()
	startLava(top)
	for _, player in Players:GetPlayers() do
		if player.Character then
			player.Character:PivotTo(towerStages[1].Start.CFrame + Vector3.new(0, 4, 0))
		end
	end
end

local function endRound()
	for _, player in Players:GetPlayers() do
		if player.Character and not finished[player] then
			player.Character:PivotTo(lobbySpawn.CFrame + Vector3.new(0, 4, 0))
		end
		player.leaderstats.Stage.Value = 0
	end
	tower:Destroy()
	lava:Destroy()
	towerStages = {}
end

-- Die Rundenschleife
while true do
	for i = Settings.Intermission, 1, -1 do
		setBoard("Next tower in " .. i)
		task.wait(1)
	end
	startRound()
	for i = Settings.RoundLength, 1, -1 do
		setBoard("Climb! " .. i .. " seconds left")
		task.wait(1)
	end
	endRound()
end