-- ServerScriptService > Script
local Players = game:GetService("Players")
local Workspace = game:GetService("Workspace")

local KEY_NAME = "Key"

local function playerHasKey(player)
	local backpack = player:FindFirstChild("Backpack")
	local character = player.Character

	if backpack and backpack:FindFirstChild(KEY_NAME) then
		return true
	end

	if character and character:FindFirstChild(KEY_NAME) then
		return true
	end

	return false
end

local function setupKey(tool)
	if not tool:IsA("Tool") then return end
	if tool.Name ~= KEY_NAME then return end
	if not tool:IsDescendantOf(Workspace) then return end

	local handle = tool:FindFirstChild("Handle")
	if not handle or not handle:IsA("BasePart") then return end

	if tool:GetAttribute("PickupHooked") then
		return
	end
	tool:SetAttribute("PickupHooked", true)

	local picked = false

	handle.Touched:Connect(function(hit)
		if picked then return end

		local character = hit:FindFirstAncestorOfClass("Model")
		if not character then return end

		local player = Players:GetPlayerFromCharacter(character)
		if not player then return end

		picked = true
		handle.CanTouch = false

		if playerHasKey(player) then
			tool:Destroy()
			return
		end

		local backpack = player:WaitForChild("Backpack")
		local clone = tool:Clone()
		clone.Parent = backpack
		tool:Destroy()
	end)
end

for _, inst in ipairs(Workspace:GetDescendants()) do
	setupKey(inst)
end

Workspace.DescendantAdded:Connect(setupKey)