local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local player = Players.LocalPlayer
local camera = workspace.CurrentCamera

local screenGui = Instance.new("ScreenGui", player:WaitForChild("PlayerGui"))
screenGui.Name = "AimWarningGui"
local textLabel = Instance.new("TextLabel", screenGui)
textLabel.Size = UDim2.new(0, 200, 0, 50)
textLabel.Position = UDim2.new(0.5, -100, 0.1, 0)
textLabel.BackgroundColor3 = Color3.new(1, 0, 0)
textLabel.TextColor3 = Color3.new(1, 1, 1)
textLabel.TextScaled = true
textLabel.Text = "⚠ Someone is aiming at you!"
textLabel.Visible = false
textLabel.Font = Enum.Font.SourceSansBold

local function isAimingAtMe(otherPlayer)
    if otherPlayer.Character and otherPlayer.Character:FindFirstChild("Head") and player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
        local head = otherPlayer.Character.Head
        local hrp = player.Character.HumanoidRootPart
        
        -- Raycast from otherPlayer's head or camera to their mouse direction (approximate)
        -- We approximate the aim direction by using their camera's lookVector if available
        local otherCamera = workspace.CurrentCamera
        if otherPlayer == player then return false end
        
        -- Get the mouse hit position of the other player using their mouse location
        -- Unfortunately we can't get other player's mouse position directly in a LocalScript
        -- So we approximate by checking if player's HRP is in front of otherPlayer's camera and in their FOV

        local character = otherPlayer.Character
        local humanoidRootPart = character:FindFirstChild("HumanoidRootPart")
        if not humanoidRootPart then return false end

        local camCFrame = (otherPlayer == player) and camera.CFrame or humanoidRootPart.CFrame -- fallback
        
        -- Vector from other player to you
        local dirToPlayer = (hrp.Position - humanoidRootPart.Position).Unit
        local lookVector = humanoidRootPart.CFrame.LookVector

        -- Angle between lookVector and direction to you
        local dot = lookVector:Dot(dirToPlayer)

        -- Check if within approx 20 degrees (cos 20° ≈ 0.94)
        if dot > 0.94 then
            -- Check distance too
            local dist = (hrp.Position - humanoidRootPart.Position).Magnitude
            if dist < 100 then -- only if close enough
                return true
            end
        end
    end
    return false
end

RunService.Heartbeat:Connect(function()
    local aimingPlayers = {}
    for _, otherPlayer in pairs(Players:GetPlayers()) do
        if otherPlayer ~= player then
            if isAimingAtMe(otherPlayer) then
                table.insert(aimingPlayers, otherPlayer.Name)
            end
        end
    end
    
    if #aimingPlayers > 0 then
        textLabel.Visible = true
        textLabel.Text = "⚠ " .. table.concat(aimingPlayers, ", ") .. " is aiming at you!"
    else
        textLabel.Visible = false
    end
end)