## DataLoader.gd
## Utility for loading and caching JSON data files.
class_name DataLoader

static func load_json(path: String) -> Variant:
	var file = FileAccess.open(path, FileAccess.READ)
	if not file:
		push_error("DataLoader: cannot open " + path)
		return null
	var json = JSON.new()
	var err = json.parse(file.get_as_text())
	file.close()
	if err != OK:
		push_error("DataLoader: parse error in " + path + " at line " + str(json.get_error_line()))
		return null
	return json.data

static func load_towers(race: String) -> Array:
	var data = load_json("res://data/towers/" + race + ".json")
	return data if data is Array else []

static func load_waves() -> Array:
	var data = load_json("res://data/waves.json")
	return data if data is Array else []

static func load_sends() -> Array:
	var data = load_json("res://data/sends.json")
	return data if data is Array else []