--==================================================
-- Services
--==================================================
local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local Player = Players.LocalPlayer
local char = Player.Character or Player.CharacterAdded:Wait()
local hrp = char:WaitForChild("HumanoidRootPart")

--==================================================
-- Get F3X
--==================================================
local function getF3X()
	for _, v in ipairs(Player.Backpack:GetChildren()) do
		if v:FindFirstChild("SyncAPI") then
			return v
		end
	end
	for _, v in ipairs(char:GetChildren()) do
		if v:FindFirstChild("SyncAPI") then
			return v
		end
	end
end

local f3x = getF3X()
if not f3x then
	warn("F3X not found")
	return
end

local remote = f3x.SyncAPI.ServerEndpoint
local function _(args)
	remote:InvokeServer(unpack(args))
end

--==================================================

--==================================================
-- Create Part Above Head
--==================================================
local part = remote:InvokeServer("CreatePart","Normal",hrp.CFrame * CFrame.new(0,5,0),workspace)

_( {"SyncResize", {{ Part = part, CFrame = part.CFrame, Size = Vector3.new(2,2,2) }}})
_( {"SyncAnchor", {{ Part = part, Anchored = true }}})
_( {"SyncCollision", {{ Part = part, CanCollide = false }}})
_( {"SyncColor", {{ Part = part, Color = Color3.new(1,1,1), UnionColoring = false }}})
_( {"SyncMaterial", {{ Part = part, Material = Enum.Material.SmoothPlastic, Transparency = 0 }}})

-- Mesh
_( {"CreateMeshes", {{ Part = part }}})
_( {"SyncMesh", {{ Part = part, MeshId = "rbxassetid://1347582902", Scale = Vector3.new(4,4,4) }}})

-- Texture
_( {"CreateTextures", {{ Part = part, Face = Enum.NormalId.Top, TextureType = "Decal" }}})
_( {"SyncTexture", {{ Part = part, Face = Enum.NormalId.Top, TextureType = "Decal", Texture = "rbxassetid://136244369348699" }}})

--==================================================
-- Variables
--==================================================
local rot = 0
local targetPlayer = nil
local laserPart = nil
local laserActive = false

--==================================================
-- Create / Remove Laser
--==================================================
local function createLaser()
	if not targetPlayer or not targetPlayer.Character then return end
	if laserPart then
		_( {"Remove", {{ laserPart }}} )
	end

	local startPos = part.Position
	local targetHead = targetPlayer.Character:FindFirstChild("Head")
	if not targetHead then return end
	local distance = (targetHead.Position - startPos).Magnitude

	laserPart = remote:InvokeServer("CreatePart","Normal",CFrame.new(startPos, targetHead.Position),workspace)
	_( {"SyncResize", {{ Part = laserPart, CFrame = laserPart.CFrame, Size = Vector3.new(0.2,0.2,distance) }}} )
	_( {"SyncAnchor", {{ Part = laserPart, Anchored = true }}} )
	_( {"SyncCollision", {{ Part = laserPart, CanCollide = false }}} )
	_( {"SyncMaterial", {{ Part = laserPart, Material = Enum.Material.Neon }}} )
	_( {"SyncColor", {{ Part = laserPart, Color = Color3.new(1,0,0), UnionColoring = false }}} )
end

local function removeLaser()
	if laserPart then
		_( {"Remove", {{ laserPart }}} )
		laserPart = nil
	end
	targetPlayer = nil
	laserActive = false
end

--==================================================
-- Follow Head + Rotate + Laser
--==================================================
RunService.RenderStepped:Connect(function(dt)
	if not hrp or not hrp.Parent then return end
	rot += dt * 1.5
	local cf = hrp.CFrame * CFrame.new(0,5,0) * CFrame.Angles(0,rot,0)
	_( {"SyncMove", {{ Part = part, CFrame = cf }}})

	if laserActive and targetPlayer and targetPlayer.Character then
		local targetHead = targetPlayer.Character:FindFirstChild("Head")
		if targetHead then
			-- Move head slightly down only if laser active
			local headCF = targetHead.CFrame * CFrame.Angles(-0.2,0,0)
			_( {"SyncMove", {{ Part = targetHead, CFrame = headCF }}} )

			-- Create or update laser
			if not laserPart then
				createLaser()
			else
				local distance = (targetHead.Position - part.Position).Magnitude
				local laserCF = CFrame.new(part.Position, targetHead.Position) * CFrame.new(0,0,-distance/2)
				_( {"SyncResize", {{ Part = laserPart, CFrame = laserCF, Size = Vector3.new(0.2,0.2,distance) }}} )
			end
		end
	end
end)

--==================================================
-- Remove laser if player dies
--==================================================
RunService.Heartbeat:Connect(function()
	if targetPlayer then
		local humanoid = targetPlayer.Character and targetPlayer.Character:FindFirstChild("Humanoid")
		if not humanoid or humanoid.Health <= 0 then
			removeLaser()
		end
	end
end)

--==================================================
-- Button actions
--==================================================
local function findPlayerByPartialName(part)
	for _, plr in ipairs(Players:GetPlayers()) do
		if plr.Name:lower():sub(1,#part) == part:lower() then
			return plr
		end
	end
end

onBtn.MouseButton1Click:Connect(function()
	local namePart = textbox.Text
	local plr = findPlayerByPartialName(namePart)
	if plr then
		targetPlayer = plr
		laserActive = true
	end
end)

offBtn.MouseButton1Click:Connect(function()
	removeLaser()
end)