# Derived from https://github.com/jegor377/godot-gdgifexporter

@tool
extends EditorImportPlugin


func _can_import_threaded():
	return false


func _get_priority():
	return 100


func _get_import_order():
	# 数字越小越提前
	return ResourceImporter.IMPORT_ORDER_DEFAULT - 100


func _get_importer_name():
	return "gif.animated.texture.plugin"


func _get_visible_name():
	return "Sprite Frames (Thread Safe)"


func _get_recognized_extensions():
	return ["gif"]


func _get_save_extension():
	return "tres"


func _get_resource_type():
	return "SpriteFrames"


func _get_preset_count():
	return 0


func _get_preset_name(i):
	return ""


func _get_import_options(_path, _i):
	return []


func _get_option_visibility(path: String, option_name: StringName, options: Dictionary) -> bool:
	return false


# 防止同时加载多个文件时卡死
static var MUTEX = Mutex.new()

const gif_dir = "res://asset/art/gif/"

func _import(source_file, save_path, options, platform_variants, gen_files):
	if GifManager == null:
		printerr("GifManager is not available!")
		return FAILED
	var file = FileAccess.open(source_file, FileAccess.READ)
	var buffer = file.get_buffer(file.get_length())
	file.close()
	MUTEX.lock()
	var frames = GifManager.sprite_frames_from_buffer(buffer, 0, 30)
	var filename = save_path + "." + _get_save_extension()
	var code = ResourceSaver.save(frames, filename)
	# await get_tree().create_timer(0.1).timeout
	MUTEX.unlock()
	print_debug("Imported GIF frames: ", frames.get_frame_count("gif"), " from ", source_file)
	var base_dir = source_file.get_base_dir()
	if base_dir != gif_dir and base_dir.begins_with(gif_dir):
		var animation_name = source_file.get_file().replace(".gif", "")
		var dir_name = base_dir + "/" + animation_name + "/"
		if DirAccess.dir_exists_absolute(dir_name):
			DirAccess.remove_absolute(dir_name)
		DirAccess.make_dir_absolute(dir_name)
		var sprite_frames_path = base_dir + "/frames.tres"
		var sprite_frames: SpriteFrames
		if not FileAccess.file_exists(sprite_frames_path):
			sprite_frames = SpriteFrames.new()
			sprite_frames.resource_path = sprite_frames_path
		else:
			sprite_frames = load(sprite_frames_path) as SpriteFrames
		if sprite_frames.has_animation(animation_name):
			sprite_frames.clear(animation_name)
		else:
			sprite_frames.add_animation(animation_name)
		sprite_frames.set_animation_loop(animation_name, frames.get_animation_loop("gif"))
		sprite_frames.set_animation_speed(animation_name, frames.get_animation_speed("gif"))
		for i in range(frames.get_frame_count("gif")):
			var texture = frames.get_frame_texture("gif", i) as Texture2D
			var image = texture.get_image()
			var image_path = dir_name + str(i) + ".png"
			image.save_png(image_path)
			texture = ImageTexture.create_from_image(image)
			texture.take_over_path(image_path)
			var duration = frames.get_frame_duration("gif", i)
			sprite_frames.add_frame(animation_name, texture, duration)
		print_debug("Created images and added to SpriteFrames: ", animation_name)
		ResourceSaver.save(sprite_frames)
	return code