local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local player = Players.LocalPlayer
local camera = workspace.CurrentCamera

local PlayerModule = require(player.PlayerScripts:WaitForChild("PlayerModule"))
local Controls = PlayerModule:GetControls()

-- ================= НАСТРОЙКИ =================
local KEY = Enum.KeyCode.Z

local PREVIEW_FPS = 24
local PREVIEW_STEP = 7.5
local TURN_SMOOTH = 0.35

local START_EXEC_AFTER = 12
local MAX_FRAMES_BUFFER = 30
local WALK_SPEED = 900
local ARRIVE_DIST = 3

local CAM_LERP = 0.15
local CAM_OFFSET = Vector3.new(0,4,0)

-- ================= СОСТОЯНИЕ =================
local char
local humanoid
local hrp

local active = false
local executing = false

local frames = {}
local trails = {}
local execIndex = 1
local frameTimer = 0
local currentDir = Vector3.zero
local lastPreviewCF

-- 🎥 camera target
local camPart = Instance.new("Part")
camPart.Size = Vector3.one
camPart.Transparency = 1
camPart.Anchored = true
camPart.CanCollide = false
camPart.Parent = workspace

-- ================= UTILS =================
local function clearTrails()
	for _,t in ipairs(trails) do
		if t.Parent then t:Destroy() end
	end
	trails = {}
end

local function resetState()
	active = false
	executing = false

	clearTrails()
	frames = {}
	execIndex = 1

	if humanoid then
		humanoid.WalkSpeed = 16
		humanoid.JumpPower = 50
	end

	Controls:Enable()
	camera.CameraSubject = humanoid
end

-- ================= CHARACTER SETUP =================
local function setupCharacter(c)
	char = c
	humanoid = c:WaitForChild("Humanoid")
	hrp = c:WaitForChild("HumanoidRootPart")

	camera.CameraSubject = humanoid

	humanoid.Died:Connect(function()
		resetState()
	end)
end

if player.Character then
	setupCharacter(player.Character)
end

player.CharacterAdded:Connect(setupCharacter)

-- ================= VISUAL =================
local function createTrail(cf)
	local p = Instance.new("Part")
	p.Size = Vector3.new(2,5,1)
	p.Anchored = true
	p.CanCollide = false
	p.Material = Enum.Material.Neon
	p.Color = Color3.fromRGB(170,70,255)
	p.CFrame = cf
	p.Parent = workspace
	table.insert(trails, p)
end

-- ================= START =================
local function start()
	if not humanoid or not hrp then return end

	active = true
	executing = false

	clearTrails()
	frames = {}
	execIndex = 1
	frameTimer = 0

	currentDir = hrp.CFrame.LookVector
	lastPreviewCF = hrp.CFrame

	humanoid.WalkSpeed = 0
	humanoid.JumpPower = 0

	camera.CameraSubject = camPart
	camPart.Position = hrp.Position
end

-- ================= STOP =================
local function stopAll()
	resetState()
end

-- ================= INPUT =================
UserInputService.InputBegan:Connect(function(input, gp)
	if gp then return end
	if input.KeyCode == KEY then
		start()
	end
end)

UserInputService.InputEnded:Connect(function(input, gp)
	if gp then return end
	if input.KeyCode == KEY then
		stopAll()
	end
end)

-- ================= UPDATE =================
RunService.Heartbeat:Connect(function(dt)
	if not active or not humanoid or not hrp then return end

	frameTimer += dt
	if frameTimer < 1 / PREVIEW_FPS then return end
	frameTimer -= 1 / PREVIEW_FPS

	-- INPUT DIR
	local look = camera.CFrame.LookVector
	local right = camera.CFrame.RightVector
	local inputDir = Vector3.zero

	if UserInputService:IsKeyDown(Enum.KeyCode.W) then
		inputDir += Vector3.new(look.X,0,look.Z)
	end
	if UserInputService:IsKeyDown(Enum.KeyCode.S) then
		inputDir -= Vector3.new(look.X,0,look.Z)
	end
	if UserInputService:IsKeyDown(Enum.KeyCode.A) then
		inputDir -= Vector3.new(right.X,0,right.Z)
	end
	if UserInputService:IsKeyDown(Enum.KeyCode.D) then
		inputDir += Vector3.new(right.X,0,right.Z)
	end

	if inputDir.Magnitude > 0 then
		currentDir = currentDir:Lerp(inputDir.Unit, TURN_SMOOTH)

		local lastCF = frames[#frames] or hrp.CFrame
		local nextPos = lastCF.Position + currentDir * PREVIEW_STEP
		local cf = CFrame.new(nextPos, nextPos + currentDir)

		table.insert(frames, cf)
		createTrail(cf)
		lastPreviewCF = cf

		if #frames > MAX_FRAMES_BUFFER then
			table.remove(frames, 1)
			local t = table.remove(trails, 1)
			if t then t:Destroy() end
			if execIndex > 1 then execIndex -= 1 end
		end
	end

	-- CAMERA FOLLOW
	if lastPreviewCF then
		camPart.Position = camPart.Position:Lerp(
			lastPreviewCF.Position + CAM_OFFSET,
			CAM_LERP
		)
	end

	-- START EXECUTION
	if not executing and #frames >= START_EXEC_AFTER then
		executing = true
		Controls:Disable()
		humanoid.WalkSpeed = WALK_SPEED
	end

	-- MOVE
	if executing then
		local target = frames[execIndex]
		if not target then return end

		if (target.Position - hrp.Position).Magnitude <= ARRIVE_DIST then
			execIndex += 1
		else
			humanoid:MoveTo(target.Position)
		end
	end
end)