--// CLEANUP (prevents duplicates if re-executed)
local player = game.Players.LocalPlayer
local playerGui = player:WaitForChild("PlayerGui")

if playerGui:FindFirstChild("SnakeUI") then
	playerGui.SnakeUI:Destroy()
end

--// Create ScreenGui
local gui = Instance.new("ScreenGui")
gui.Name = "SnakeUI"
gui.ResetOnSpawn = false
gui.Parent = playerGui

--// Main Window
local window = Instance.new("Frame")
window.Size = UDim2.new(0, 300, 0, 420)
window.Position = UDim2.new(0.5, -150, 0.5, -210)
window.BackgroundColor3 = Color3.fromRGB(240, 240, 240)
window.BorderSizePixel = 2
window.Parent = gui

--// Title Bar
local titleBar = Instance.new("Frame", window)
titleBar.Size = UDim2.new(1, 0, 0, 30)
titleBar.BackgroundColor3 = Color3.fromRGB(0, 120, 215)

local title = Instance.new("TextLabel", titleBar)
title.Size = UDim2.new(1, 0, 1, 0)
title.Text = "Snake"
title.TextColor3 = Color3.new(1,1,1)
title.BackgroundTransparency = 1
title.Font = Enum.Font.SourceSansBold
title.TextSize = 18

--// DRAG SYSTEM (works on mobile + executors)
local dragging = false
local dragStart, startPos

titleBar.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch then
		dragging = true
		dragStart = input.Position
		startPos = window.Position
	end
end)

titleBar.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch then
		dragging = false
	end
end)

game:GetService("UserInputService").InputChanged:Connect(function(input)
	if dragging and (input.UserInputType == Enum.UserInputType.MouseMovement or input.UserInputType == Enum.UserInputType.Touch) then
		local delta = input.Position - dragStart
		window.Position = UDim2.new(
			startPos.X.Scale,
			startPos.X.Offset + delta.X,
			startPos.Y.Scale,
			startPos.Y.Offset + delta.Y
		)
	end
end)

--// Score Label
local scoreLabel = Instance.new("TextLabel", window)
scoreLabel.Position = UDim2.new(0, 10, 0, 32)
scoreLabel.Size = UDim2.new(1, -20, 0, 20)
scoreLabel.BackgroundTransparency = 1
scoreLabel.TextColor3 = Color3.new(0,0,0)
scoreLabel.Font = Enum.Font.SourceSansBold
scoreLabel.TextSize = 16
scoreLabel.Text = "Score: 0 | High: 0"

--// Game Area
local gameFrame = Instance.new("Frame", window)
gameFrame.Position = UDim2.new(0, 10, 0, 55)
gameFrame.Size = UDim2.new(1, -20, 0, 225)
gameFrame.BackgroundColor3 = Color3.fromRGB(30, 30, 30)

--// Controls
local controls = Instance.new("Frame", window)
controls.Position = UDim2.new(0, 0, 1, -140)
controls.Size = UDim2.new(1, 0, 0, 140)
controls.BackgroundTransparency = 1

local function makeButton(text, pos)
	local btn = Instance.new("TextButton", controls)
	btn.Size = UDim2.new(0, 60, 0, 60)
	btn.Position = pos
	btn.Text = text
	btn.BackgroundColor3 = Color3.fromRGB(200,200,200)
	btn.TextScaled = true
	return btn
end

local up = makeButton("↑", UDim2.new(0.5, -30, 0, 0))
local down = makeButton("↓", UDim2.new(0.5, -30, 0, 70))
local left = makeButton("←", UDim2.new(0.5, -100, 0, 70))
local right = makeButton("→", UDim2.new(0.5, 40, 0, 70))

--// Game Over UI
local gameOverLabel = Instance.new("TextLabel", gameFrame)
gameOverLabel.Size = UDim2.new(1, 0, 0, 50)
gameOverLabel.Position = UDim2.new(0, 0, 0.35, 0)
gameOverLabel.Text = "GAME OVER"
gameOverLabel.TextColor3 = Color3.new(1,0,0)
gameOverLabel.BackgroundTransparency = 1
gameOverLabel.TextScaled = true
gameOverLabel.Visible = false

local finalScoreLabel = Instance.new("TextLabel", gameFrame)
finalScoreLabel.Size = UDim2.new(1, 0, 0, 30)
finalScoreLabel.Position = UDim2.new(0, 0, 0.5, 0)
finalScoreLabel.BackgroundTransparency = 1
finalScoreLabel.TextColor3 = Color3.new(1,1,1)
finalScoreLabel.TextScaled = true
finalScoreLabel.Visible = false

local retryButton = Instance.new("TextButton", gameFrame)
retryButton.Size = UDim2.new(0.5, 0, 0, 40)
retryButton.Position = UDim2.new(0.25, 0, 0.65, 0)
retryButton.Text = "Retry"
retryButton.Visible = false

--// Grid
local gridSize = 15
local cellSize = 15
local cells = {}

for x = 1, gridSize do
	for y = 1, gridSize do
		local cell = Instance.new("Frame", gameFrame)
		cell.Size = UDim2.new(0, cellSize, 0, cellSize)
		cell.Position = UDim2.new(0, (x-1)*cellSize, 0, (y-1)*cellSize)
		cell.BackgroundColor3 = Color3.fromRGB(50,50,50)
		cells[x..","..y] = cell
	end
end

--// Game State
local snake, direction, food, alive
local score = 0
local highScore = 0

local function updateScore()
	scoreLabel.Text = "Score: "..score.." | High: "..highScore
end

local function startGame()
	snake = {{x = 5, y = 5}}
	direction = "Right"
	food = {x = math.random(1, gridSize), y = math.random(1, gridSize)}
	alive = true
	score = 0
	
	gameOverLabel.Visible = false
	retryButton.Visible = false
	finalScoreLabel.Visible = false
	
	updateScore()
end

startGame()

--// Inputs
up.MouseButton1Click:Connect(function() if alive then direction = "Up" end end)
down.MouseButton1Click:Connect(function() if alive then direction = "Down" end end)
left.MouseButton1Click:Connect(function() if alive then direction = "Left" end end)
right.MouseButton1Click:Connect(function() if alive then direction = "Right" end end)

retryButton.MouseButton1Click:Connect(startGame)

--// Game Loop
task.spawn(function()
	while true do
		task.wait(0.2)
		if not alive then continue end

		local head = {x = snake[1].x, y = snake[1].y}

		if direction == "Up" then head.y -= 1 end
		if direction == "Down" then head.y += 1 end
		if direction == "Left" then head.x -= 1 end
		if direction == "Right" then head.x += 1 end

		if head.x < 1 or head.y < 1 or head.x > gridSize or head.y > gridSize then
			alive = false
		end

		for _, part in ipairs(snake) do
			if head.x == part.x and head.y == part.y then
				alive = false
			end
		end

		if not alive then
			if score > highScore then
				highScore = score
			end
			
			gameOverLabel.Visible = true
			finalScoreLabel.Text = "Score: "..score
			finalScoreLabel.Visible = true
			retryButton.Visible = true
			
			updateScore()
			continue
		end

		table.insert(snake, 1, head)

		if head.x == food.x and head.y == food.y then
			score += 1
			updateScore()
			food = {x = math.random(1, gridSize), y = math.random(1, gridSize)}
		else
			table.remove(snake)
		end

		for _, cell in pairs(cells) do
			cell.BackgroundColor3 = Color3.fromRGB(50,50,50)
		end

		for _, part in ipairs(snake) do
			cells[part.x..","..part.y].BackgroundColor3 = Color3.fromRGB(0,255,0)
		end

		cells[food.x..","..food.y].BackgroundColor3 = Color3.fromRGB(255,0,0)
	end
end)