local player = game.Players.LocalPlayer
local backpack = player:WaitForChild("Backpack")
local playerGui = player:WaitForChild("PlayerGui")

for _, item in ipairs(backpack:GetChildren()) do
	if item:IsA("Tool") and item.Name == "Part Selector" then
		item:Destroy()
	end
end

for _, part in ipairs(workspace:GetDescendants()) do
	local highlight = part:FindFirstChild("PartHighlight")
	if highlight then
		highlight:Destroy()
	end
end

local tool = Instance.new("Tool")
tool.Name = "Part Selector"
tool.RequiresHandle = false
tool.Parent = backpack

local screenGui = playerGui:FindFirstChild("PartCounterGUI") or Instance.new("ScreenGui", playerGui)
screenGui.Name = "PartCounterGUI"
screenGui:ClearAllChildren()

local counterLabel = Instance.new("TextLabel", screenGui)
counterLabel.Size = UDim2.new(0, 200, 0, 50)
counterLabel.Position = UDim2.new(0.5, -100, 0, 20)
counterLabel.BackgroundTransparency = 1
counterLabel.TextScaled = true
counterLabel.TextColor3 = Color3.new(1, 1, 1)
counterLabel.Font = Enum.Font.SourceSansBold
counterLabel.Text = "Parts Selected: 0"

local clearButton = Instance.new("TextButton", screenGui)
clearButton.Size = UDim2.new(0, 120, 0, 40)
clearButton.Position = UDim2.new(0.5, -60, 0, 80)
clearButton.BackgroundColor3 = Color3.new(0.3, 0.3, 0.3)
clearButton.TextColor3 = Color3.new(1, 1, 1)
clearButton.TextScaled = true
clearButton.Font = Enum.Font.SourceSansBold
clearButton.Text = "Clear All"
clearButton.BorderSizePixel = 0
clearButton.BackgroundTransparency = 0.2

local selectedParts = {}
local selectionCount = 0
local mouseDown = false
local hoveredThisDrag = {}
local toolEquipped = false

local function updateCounter()
	counterLabel.Text = "Parts Selected: " .. tostring(selectionCount)
end

local function highlightPart(part, highlight)
	local existingHighlight = part:FindFirstChild("PartHighlight")
	if highlight then
		if not existingHighlight then
			local selectionBox = Instance.new("SelectionBox")
			selectionBox.Adornee = part
			selectionBox.Color3 = Color3.new(0, 1, 0)
			selectionBox.Transparency = 0.5
			selectionBox.LineThickness = 0.05
			selectionBox.Name = "PartHighlight"
			selectionBox.Parent = part
		end
	else
		if existingHighlight then
			existingHighlight:Destroy()
		end
	end
end

clearButton.MouseButton1Click:Connect(function()
	for part in pairs(selectedParts) do
		highlightPart(part, false)
	end
	selectedParts = {}
	selectionCount = 0
	updateCounter()
end)

tool.Equipped:Connect(function()
	toolEquipped = true
	local mouse = player:GetMouse()

	mouse.Button1Down:Connect(function()
		if not toolEquipped then return end
		mouseDown = true
		hoveredThisDrag = {}
	end)

	mouse.Button1Up:Connect(function()
		mouseDown = false
	end)
end)

tool.Unequipped:Connect(function()
	toolEquipped = false
	mouseDown = false
end)

local lastCheckTime = 0
local debounceInterval = 0.05

game:GetService("RunService").RenderStepped:Connect(function()
	if toolEquipped and mouseDown then
		local currentTime = tick()

		if currentTime - lastCheckTime < debounceInterval then return end
		lastCheckTime = currentTime

		local mouse = player:GetMouse()
		local target = mouse.Target
		if target and target:IsA("BasePart") and not hoveredThisDrag[target] then
			hoveredThisDrag[target] = true
			if selectedParts[target] then
				selectedParts[target] = nil
				selectionCount -= 1
				highlightPart(target, false)
			else
				selectedParts[target] = true
				selectionCount += 1
				highlightPart(target, true)
			end
			updateCounter()
		end
	end
end)