local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local Workspace = game:GetService("Workspace")
local CoreGui = game:GetService("CoreGui")

local localPlayer = Players.LocalPlayer
local camera = Workspace.CurrentCamera

-- State
local enabled = true
local highlightFolder = Instance.new("Folder")
highlightFolder.Name = "ESP_Highlights"
highlightFolder.Parent = CoreGui -- <== changed from PlayerGui

-- Function to check if a part is visible (on screen and not blocked)
local function isPartVisible(part)
	if not part or not part.Parent then return false end
	
	-- Check if on screen
	local vector, inViewport = camera:WorldToViewportPoint(part.Position)
	local onScreen = inViewport and vector.Z > 0
	if not onScreen then return false end
	
	-- Raycast from camera to part with very long distance
	local ray = camera:ViewportPointToRay(vector.X, vector.Y)
	local raycastParams = RaycastParams.new()
	raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
	raycastParams.FilterDescendantsInstances = {localPlayer.Character, part}
	
	local result = Workspace:Raycast(ray.Origin, ray.Direction * 10000, raycastParams)
	
	-- Visible if ray hits nothing or hits the part itself
	return not result or result.Instance == part
end

-- Function to update outlines for all other players
local function updateOutlines()
	-- Clear old highlights
	for _, child in ipairs(highlightFolder:GetChildren()) do
		child:Destroy()
	end
	
	-- Only run if ESP is enabled
	if not enabled then return end
	
	-- Loop through all other players
	for _, player in ipairs(Players:GetPlayers()) do
		if player ~= localPlayer and player.Character then
			local character = player.Character
			local rootPart = character:FindFirstChild("HumanoidRootPart")
			
			if rootPart then
				-- Check visibility
				local isVisible = isPartVisible(rootPart)
				
				-- Create a Highlight for this player
				local highlight = Instance.new("Highlight")
				highlight.FillTransparency = 1  -- Only outline (no fill)
				highlight.OutlineTransparency = 0
				highlight.OutlineColor = isVisible and Color3.new(1, 0, 0) or Color3.new(0, 1, 0) -- Red if visible, green if not
				highlight.FillColor = highlight.OutlineColor
				highlight.Parent = highlightFolder
				highlight.Adornee = character
			end
		end
	end
end

-- Toggle with F key
UserInputService.InputBegan:Connect(function(input, gameProcessed)
	if gameProcessed then return end
	if input.KeyCode == Enum.KeyCode.F then
		enabled = not enabled
		if not enabled then
			-- Clear all highlights when disabled
			for _, child in ipairs(highlightFolder:GetChildren()) do
				child:Destroy()
			end
		end
	end
end)

-- Update outlines every frame (smooth update)
RunService.Heartbeat:Connect(function()
	updateOutlines()
end)

-- Handle new players joining
Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function()
		updateOutlines()
	end)
end)

-- Initial run
updateOutlines()