class_name LoadSingleton extends Node

signal loadStart(scenePath:String, loadId:int)
signal loadEnd(scenePath:String, loadId:int, resource:Resource)
signal loadError(scenePath:String, loadId:int, error:String)
signal loadProgress(scenePath:String, loadId:int, progress:float)

var watchingIds:Array[int] = []

func _process(delta: float) -> void:
	var wIds = watchingIds.duplicate()
	for watchId in wIds:
		var status = ResourceLoader.load_threaded_get_status(watchId)
		if status == ResourceLoader.ThreadLoadStatus.THREAD_LOAD_LOADED:
			watchingIds.erase(watchId)
			var resource = ResourceLoader.load_threaded_get(watchId)
			loadEnd.emit(watchId, resource)
		elif status == ResourceLoader.ThreadLoadStatus.THREAD_LOAD_FAILED:
			watchingIds.erase(watchId)
			loadError.emit(watchId, "Error loading resource.")
		elif status == ResourceLoader.ThreadLoadStatus.THREAD_LOAD_INVALID_RESOURCE:
			watchingIds.erase(watchId)
			loadError.emit(watchId, "Invalid Resource.")
		elif status == ResourceLoader.ThreadLoadStatus.THREAD_LOAD_IN_PROGRESS:
			loadProgress.emit(watchId, 0.0)
	pass

func load(scenePath:String) -> int:
	var loadId = ResourceLoader.load_threaded_request(scenePath)
	watchingIds.append(loadId)
	loadStart.emit(scenePath, loadId)
	return loadId