@tool
extends Node2D

@export var export_dir_root := "res://asset/art/ui/note/"
@export var json: JSON  # can be a JSONParseResult or a Dictionary
@export var texture: Texture2D
@export_tool_button("执行") var execute = _run
@export var demo_scale := 0.5
@export_tool_button("刷新 demo") var refresh = _refresh_demo

var export_dir


func _run() -> void:
	if not json or not texture:
		printerr("JSON 或 texture 未设置")
		return

	if not export_dir_root:
		push_error("导出目录未设置")
		return

	export_dir = export_dir_root + ("" if export_dir_root.ends_with("/") else "/")
	export_dir = export_dir + json.resource_path.get_file().split(".")[0] + "/"
	print("导出目录: ", export_dir)

	# 确保导出目录存在
	DirAccess.make_dir_recursive_absolute(export_dir)

	# 解析 JSON 数据
	var data: Dictionary
	if json:
		data = json.data

	# 检查 meta.slices
	if not data.has("meta") or not data.meta.has("slices"):
		push_error("JSON 中缺少 meta.slices")
		return

	for slice_dict in data.meta.slices:
		var slice_name = slice_dict.get("name", "")
		var keys = slice_dict.get("keys", [])
		if slice_name == "" or keys.is_empty():
			continue
		var key = keys[0]
		var bounds = key.get("bounds", null)
		if typeof(bounds) != TYPE_DICTIONARY:
			continue
		var rect := Rect2(
			bounds.get("x", 0), bounds.get("y", 0), bounds.get("w", 0), bounds.get("h", 0)
		)
		_create_and_save_atlas(slice_name, rect)
		print("已导出 Atlas: ", slice_name, " at ", export_dir)


func _create_and_save_atlas(atlas_name: String, region: Rect2) -> void:
	var path = export_dir + atlas_name + ".tres"
	var atlas_res: AtlasTexture
	if FileAccess.file_exists(path):
		atlas_res = load(path)
		print_rich("[color=cyan]加载已有的 Atlas: ", path)
	if not atlas_res:
		atlas_res = AtlasTexture.new()
		atlas_res.resource_path = path
		print_rich("[color=green]创建新的 Atlas: ", path)
	atlas_res.atlas = texture
	atlas_res.filter_clip = true
	atlas_res.region = region  # 修正了原来拼写错误的 regoin
	ResourceSaver.save(atlas_res, path)


func _refresh_demo() -> void:
	var demo_node = $Demo
	for c in demo_node.get_children():
		c.queue_free()
	# 将 export_dir 下的 texture 显示在 demo 下，彼此保持 200*200 距离
	var x_offset = 0
	var y_offset = 0
	for file_name in DirAccess.get_files_at(export_dir):
		if file_name.ends_with(".tres"):
			var path = export_dir + file_name
			var res = load(path)
			if res is AtlasTexture:
				var sprite = Sprite2D.new()
				sprite.texture = res
				sprite.position = Vector2(x_offset, y_offset)
				sprite.scale = Vector2(demo_scale, demo_scale)
				demo_node.add_child(sprite)
				x_offset += 200
				if x_offset > 1000:
					x_offset = 0
					y_offset += 200