-- Local setting
local player = game.Players.LocalPlayer
local servicePlayer = game:GetService("Players")
local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")


local bodyParts = {
    "Head"
}


local hitboxSizes = {}
local originalSizes = {} 
for _, partName in ipairs(bodyParts) do
    hitboxSizes[partName] = 0
end


local function ResizeBodyPart(targetPlayer, partName, size)
    if targetPlayer == player then return end  

    local character = targetPlayer.Character
    if not character then return end

    local part = character:FindFirstChild(partName)
    if not part then return end


    if not originalSizes[part] then
        originalSizes[part] = part.Size
    end


    local minSize = 0.1 
    local newSize = math.max(size, minSize)

    part.Size = Vector3.new(newSize, newSize, newSize)
    part.Transparency = 0.5
    part.CanCollide = false
    part.Massless = true
    part.Anchored = false


    if size <= 0 then
        part.Size = originalSizes[part]
    end
end


local function updateOtherPlayers()
    for _, otherPlayer in ipairs(servicePlayer:GetPlayers()) do
        if otherPlayer ~= player and otherPlayer.Character then
            for partName, size in pairs(hitboxSizes) do
                ResizeBodyPart(otherPlayer, partName, size)
            end
        end
    end
end


runService.Heartbeat:Connect(function()
    updateOtherPlayers()
end)


local function createHitboxSizeGui()
    local screenGui = Instance.new("ScreenGui")
    screenGui.Parent = player:WaitForChild("PlayerGui")

    local frame = Instance.new("Frame")
    frame.Size = UDim2.new(0, 300, 0, 100)
    frame.Position = UDim2.new(0.5, -150, 0.5, -50)
    frame.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
    frame.Active = true
    frame.Draggable = true
    frame.Parent = screenGui

    local titleLabel = Instance.new("TextLabel")
    titleLabel.Size = UDim2.new(1, 0, 0, 20)
    titleLabel.Position = UDim2.new(0, 0, 0, 0)
    titleLabel.BackgroundColor3 = Color3.fromRGB(20, 20, 20)
    titleLabel.Text = "Hitbox Size Adjuster"
    titleLabel.TextColor3 = Color3.new(1, 1, 1)
    titleLabel.Parent = frame

    local scrollFrame = Instance.new("ScrollingFrame")
    scrollFrame.Size = UDim2.new(1, 0, 1, -30)
    scrollFrame.Position = UDim2.new(0, 0, 0, 30)
    scrollFrame.BackgroundTransparency = 1
    scrollFrame.CanvasSize = UDim2.new(0, 0, 0, #bodyParts * 40)
    scrollFrame.Parent = frame

    for i, partName in ipairs(bodyParts) do
        local partFrame = Instance.new("Frame")
        partFrame.Size = UDim2.new(1, -10, 0, 30)
        partFrame.Position = UDim2.new(0, 5, 0, (i - 1) * 40)
        partFrame.BackgroundTransparency = 1
        partFrame.Parent = scrollFrame

        local partLabel = Instance.new("TextLabel")
        partLabel.Size = UDim2.new(0.4, 0, 1, 0)
        partLabel.Position = UDim2.new(0, 0, 0, 0)
        partLabel.BackgroundTransparency = 1
        partLabel.Text = partName
        partLabel.TextColor3 = Color3.new(1, 1, 1)
        partLabel.Parent = partFrame

        local sliderBackground = Instance.new("Frame")
        sliderBackground.Size = UDim2.new(0.5, 0, 0, 8)
        sliderBackground.Position = UDim2.new(0.4, 0, 0.5, -4)
        sliderBackground.BackgroundColor3 = Color3.fromRGB(80, 80, 80)
        sliderBackground.Parent = partFrame

        local sliderFill = Instance.new("Frame")
        sliderFill.Size = UDim2.new(0, 0, 1, 0)
        sliderFill.BackgroundColor3 = Color3.fromRGB(255, 0, 0)
        sliderFill.Parent = sliderBackground

        local sliderButton = Instance.new("TextButton")
        sliderButton.Size = UDim2.new(0, 20, 0, 20)
        sliderButton.Position = UDim2.new(0, -10, 0.5, -10)
        sliderButton.BackgroundColor3 = Color3.fromRGB(255, 255, 255)
        sliderButton.Text = ""
        sliderButton.AutoButtonColor = false
        sliderButton.Parent = sliderBackground


        local corner = Instance.new("UICorner")
        corner.CornerRadius = UDim.new(1, 0)
        corner.Parent = sliderButton


        sliderButton.MouseButton1Down:Connect(function()
            local connection
            connection = userInputService.InputChanged:Connect(function(input)
                if input.UserInputType == Enum.UserInputType.MouseMovement then
                    local relativeX = math.clamp(input.Position.X - sliderBackground.AbsolutePosition.X, 0, sliderBackground.AbsoluteSize.X)
                    local newSize = (relativeX / sliderBackground.AbsoluteSize.X) * 50
                    hitboxSizes[partName] = newSize

                    sliderButton.Position = UDim2.new(relativeX / sliderBackground.AbsoluteSize.X, -10, 0.5, -10)
                    sliderFill.Size = UDim2.new(relativeX / sliderBackground.AbsoluteSize.X, 0, 1, 0)
                end
            end)

            userInputService.InputEnded:Connect(function(input)
                if input.UserInputType == Enum.UserInputType.MouseButton1 then
                    connection:Disconnect()
                end
            end)
        end)
    end
end


createHitboxSizeGui()


servicePlayer.PlayerAdded:Connect(function(newPlayer)
    if newPlayer ~= player then
        newPlayer.CharacterAdded:Connect(function()
            for partName, size in pairs(hitboxSizes) do
                ResizeBodyPart(newPlayer, partName, size)
            end
        end)
    end
end)


for _, otherPlayer in ipairs(servicePlayer:GetPlayers()) do
    if otherPlayer ~= player and otherPlayer.Character then
        for partName, size in pairs(hitboxSizes) do
            ResizeBodyPart(otherPlayer, partName, size)
        end
    end
end