local RunService = game:GetService("RunService")
local Workspace = game:GetService("Workspace")

local FOLDER_NAME = "HalloweenDoorTrees"
local TARGET_NAME = "DOOR 1 NEW"
local HIGHLIGHT_NAME = "DoorHighlight"

local FILL_COLOR = Color3.fromRGB(255, 45, 45)
local OUTLINE_COLOR = Color3.fromRGB(255, 255, 255)
local FILL_TRANSPARENCY = 0.5
local OUTLINE_TRANSPARENCY = 0

local highlightCache = {}
local trackedFolder = nil
local addedConnection = nil
local removingConnection = nil

local function isTarget(object)
	return object.ClassName == "Model" and object.Name == TARGET_NAME
end

local function buildHighlight(model)
	local highlight = Instance.new("Highlight")
	highlight.Name = HIGHLIGHT_NAME
	highlight.FillColor = FILL_COLOR
	highlight.OutlineColor = OUTLINE_COLOR
	highlight.FillTransparency = FILL_TRANSPARENCY
	highlight.OutlineTransparency = OUTLINE_TRANSPARENCY
	highlight.DepthMode = Enum.HighlightDepthMode.AlwaysOnTop
	highlight.Adornee = model
	highlight.Parent = model
	return highlight
end

local function attachModel(model)
	local existing = model:FindFirstChild(HIGHLIGHT_NAME)
	if existing and existing.ClassName == "Highlight" then
		existing.Adornee = model
		highlightCache[model] = existing
		return
	end
	highlightCache[model] = buildHighlight(model)
end

local function detachModel(model)
	local highlight = highlightCache[model]
	highlightCache[model] = nil
	highlight:Destroy()
end

local function clearCache()
	for model, highlight in pairs(highlightCache) do
		highlightCache[model] = nil
		highlight:Destroy()
	end
end

local function collectTargets(root)
	local descendants = root:GetDescendants()
	for index = 1, #descendants do
		local object = descendants[index]
		if isTarget(object) then
			attachModel(object)
		end
	end
end

local function bindFolder(folder)
	collectTargets(folder)
	addedConnection = folder.DescendantAdded:Connect(function(object)
		if isTarget(object) then
			attachModel(object)
		end
	end)
	removingConnection = folder.DescendantRemoving:Connect(function(object)
		if highlightCache[object] then
			detachModel(object)
		end
	end)
end

local function unbindFolder()
	if addedConnection then
		addedConnection:Disconnect()
		addedConnection = nil
	end
	if removingConnection then
		removingConnection:Disconnect()
		removingConnection = nil
	end
end

local function syncFolder()
	local currentFolder = Workspace:FindFirstChild(FOLDER_NAME)
	if currentFolder == trackedFolder then
		return
	end
	unbindFolder()
	clearCache()
	trackedFolder = currentFolder
	if trackedFolder then
		bindFolder(trackedFolder)
	end
end

syncFolder()

RunService.Heartbeat:Connect(function()
	syncFolder()
	for model, highlight in pairs(highlightCache) do
		if highlight.Parent ~= model then
			highlight.Adornee = model
			highlight.Parent = model
		end
	end
end)