-- ================= SERVIÇOS =================
local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

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

-- ================= CONFIG =================
local MAX_SIZE = 25
local ADJUST_STEP = 2
local syncedLength = 10

-- ================= VARIÁVEIS =================
local hoveredPart
local selectedPart
local ropeStack = {}

local linkMode = "Player"
local firstObject
local firstHighlight

-- ================= HRP =================
local function getHRP()
	local char = player.Character
	if char then
		return char:FindFirstChild("HumanoidRootPart")
	end
end

-- ================= GUI =================
local gui = Instance.new("ScreenGui")
gui.Parent = player.PlayerGui
gui.ResetOnSpawn = false

-- botão abrir/fechar (canto esquerdo)
local toggleBtn = Instance.new("TextButton", gui)
toggleBtn.Size = UDim2.fromScale(0.05,0.08)
toggleBtn.Position = UDim2.fromScale(0.01,0.45)
toggleBtn.Text = "≡"
toggleBtn.TextScaled = true
toggleBtn.BackgroundColor3 = Color3.fromRGB(30,30,30)
toggleBtn.TextColor3 = Color3.new(1,1,1)
toggleBtn.BorderSizePixel = 0

-- frame principal
local frame = Instance.new("Frame", gui)
frame.Size = UDim2.fromScale(0.18,0.5)
frame.Position = UDim2.fromScale(0.8,0.3)
frame.BackgroundColor3 = Color3.fromRGB(25,25,25)
frame.BorderSizePixel = 0
frame.Visible = true

-- mover GUI
local dragging, dragStart, startPos
frame.InputBegan:Connect(function(i)
	if i.UserInputType == Enum.UserInputType.MouseButton1 then
		dragging = true
		dragStart = i.Position
		startPos = frame.Position
		i.Changed:Connect(function()
			if i.UserInputState == Enum.UserInputState.End then
				dragging = false
			end
		end)
	end
end)
frame.InputChanged:Connect(function(i)
	if dragging and i.UserInputType == Enum.UserInputType.MouseMovement then
		local d = i.Position - dragStart
		frame.Position = UDim2.new(
			startPos.X.Scale, startPos.X.Offset + d.X,
			startPos.Y.Scale, startPos.Y.Offset + d.Y
		)
	end
end)

-- ================= BOTÕES =================
local function mkBtn(t,y)
	local b = Instance.new("TextButton", frame)
	b.Size = UDim2.fromScale(0.9,0.13)
	b.Position = UDim2.fromScale(0.05,y)
	b.Text = t
	b.TextScaled = true
	b.BackgroundColor3 = Color3.fromRGB(45,45,45)
	b.TextColor3 = Color3.new(1,1,1)
	return b
end

local btnSelect = mkBtn("Selecionar",0.05)
local btnRope   = mkBtn("Criar Corda",0.2)
local btnCut    = mkBtn("Cortar Corda",0.35)
local btnObj    = mkBtn("Objeto ↔ Objeto",0.5)
local btnPlus   = mkBtn("+",0.65)
local btnMinus  = mkBtn("-",0.8)

-- ================= HIGHLIGHT =================
local highlight = Instance.new("Highlight", gui)
highlight.FillColor = Color3.fromRGB(0,255,255)
highlight.OutlineColor = highlight.FillColor
highlight.FillTransparency = 0.3

-- ================= VALIDAR =================
local function validPart(p)
	if not p or not p:IsA("BasePart") then return false end
	if p:IsDescendantOf(player.Character) then return false end
	if p.Anchored then return false end
	if p.Size.Magnitude > MAX_SIZE then return false end
	return true
end

-- ================= DETECÇÃO =================
RunService.RenderStepped:Connect(function()
	local ray = cam:ViewportPointToRay(cam.ViewportSize.X/2, cam.ViewportSize.Y/2)
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {player.Character}
	params.FilterType = Enum.RaycastFilterType.Blacklist

	local r = workspace:Raycast(ray.Origin, ray.Direction*60, params)
	if r and validPart(r.Instance) then
		hoveredPart = r.Instance
		highlight.Adornee = hoveredPart
		highlight.Enabled = true
	else
		hoveredPart = nil
		highlight.Enabled = false
	end
end)

-- ================= SELECIONAR =================
btnSelect.MouseButton1Click:Connect(function()
	if not hoveredPart then return end

	if linkMode == "Player" then
		selectedPart = hoveredPart
	else
		if not firstObject then
			firstObject = hoveredPart
			firstHighlight = Instance.new("Highlight", gui)
			firstHighlight.Adornee = firstObject
			firstHighlight.FillColor = Color3.fromRGB(0,0,255)
			firstHighlight.OutlineColor = firstHighlight.FillColor
		else
			local a1 = Instance.new("Attachment", firstObject)
			local a2 = Instance.new("Attachment", hoveredPart)

			local rope = Instance.new("RopeConstraint")
			rope.Attachment0 = a1
			rope.Attachment1 = a2
			rope.Length = syncedLength
			rope.Visible = true
			rope.Parent = firstObject

			table.insert(ropeStack,{rope=rope,att1=a1,att2=a2})

			firstHighlight:Destroy()
			firstHighlight = nil
			firstObject = nil
			linkMode = "Player"
		end
	end
end)

-- ================= CRIAR CORDA (JOGADOR) =================
btnRope.MouseButton1Click:Connect(function()
	local hrp = getHRP()
	if not hrp or not selectedPart then return end

	local a1 = Instance.new("Attachment", hrp)
	local a2 = Instance.new("Attachment", selectedPart)

	local rope = Instance.new("RopeConstraint")
	rope.Attachment0 = a1
	rope.Attachment1 = a2
	rope.Length = syncedLength
	rope.Visible = true
	rope.Parent = hrp

	table.insert(ropeStack,{rope=rope,att1=a1,att2=a2})
end)

-- ================= CORTAR ÚLTIMA =================
btnCut.MouseButton1Click:Connect(function()
	local last = table.remove(ropeStack)
	if last then
		last.rope:Destroy()
		last.att1:Destroy()
		last.att2:Destroy()
	end
end)

-- ================= MODO OBJETO =================
btnObj.MouseButton1Click:Connect(function()
	linkMode = "Object"
	firstObject = nil
	if firstHighlight then
		firstHighlight:Destroy()
		firstHighlight = nil
	end
end)

-- ================= SINCRONIZAÇÃO GLOBAL =================
local function syncAll()
	for _,r in ipairs(ropeStack) do
		r.rope.Length = syncedLength
	end
end

btnPlus.MouseButton1Click:Connect(function()
	syncedLength += ADJUST_STEP
	syncAll()
end)

btnMinus.MouseButton1Click:Connect(function()
	syncedLength = math.max(1, syncedLength - ADJUST_STEP)
	syncAll()
end)

-- ================= ABRIR / FECHAR GUI =================
toggleBtn.MouseButton1Click:Connect(function()
	frame.Visible = not frame.Visible
end)