local Players = game:GetService("Players")
local player = Players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
local hrp = char:WaitForChild("HumanoidRootPart")

local running = false

-- GUI
local gui = Instance.new("ScreenGui")
gui.Name = "WallBuilderV2"
gui.Parent = player:WaitForChild("PlayerGui")

local frame = Instance.new("Frame")
frame.Size = UDim2.new(0,200,0,120)
frame.Position = UDim2.new(0.5,-100,0.5,-60)
frame.BackgroundColor3 = Color3.fromRGB(30,30,30)
frame.Parent = gui
frame.Active = true
frame.Draggable = true

local startBtn = Instance.new("TextButton")
startBtn.Size = UDim2.new(1,-20,0,30)
startBtn.Position = UDim2.new(0,10,0,10)
startBtn.Text = "Start"
startBtn.Parent = frame

local stopBtn = Instance.new("TextButton")
stopBtn.Size = UDim2.new(1,-20,0,30)
stopBtn.Position = UDim2.new(0,10,0,45)
stopBtn.Text = "Stop"
stopBtn.Parent = frame

local unloadBtn = Instance.new("TextButton")
unloadBtn.Size = UDim2.new(1,-20,0,30)
unloadBtn.Position = UDim2.new(0,10,0,80)
unloadBtn.Text = "Unload"
unloadBtn.Parent = frame


-- fire closest proximity prompt
local function fireClosestPrompt()
    local closest
    local dist = math.huge

    for _,v in ipairs(workspace:GetDescendants()) do
        if v:IsA("ProximityPrompt") and v.Parent:IsA("BasePart") then
            local d = (hrp.Position - v.Parent.Position).Magnitude
            if d < dist then
                dist = d
                closest = v
            end
        end
    end

    if closest then
        fireproximityprompt(closest,1)
    end
end


local function run()
    while running do

        -- step 1
        char:PivotTo(CFrame.new(-255,6,-139))
        task.wait(0.15)

        -- step 2
        fireClosestPrompt()
        task.wait(0.15)

        -- step 3 equip brick
        local tool = player.Backpack:FindFirstChild("Brick")
        if tool then
            tool.Parent = char
        end

        task.wait(0.15)

        -- step 4 scan bricks
        local bricks = {}
        for _,v in ipairs(workspace:GetChildren()) do
            if v:IsA("BasePart") and v.Name:match("^Brick%d+$") then
                table.insert(bricks,v)
            end
        end

        if #bricks > 0 then
            local brick = bricks[math.random(1,#bricks)]

            local prompt = brick:FindFirstChild("PickupPrompt")
            if prompt then
                fireproximityprompt(prompt,1)
            end

            task.wait(0.15)

            -- tp to brick
            char:PivotTo(brick.CFrame + Vector3.new(0,3,0))
            task.wait(0.15)

            -- fire again
            fireClosestPrompt()
        end

        task.wait(0.1)
    end
end


startBtn.MouseButton1Click:Connect(function()
    if not running then
        running = true
        task.spawn(run)
    end
end)

stopBtn.MouseButton1Click:Connect(function()
    running = false
end)

unloadBtn.MouseButton1Click:Connect(function()
    running = false
    gui:Destroy()
end)