# datapack_creator.gd
class_name DatapackCreator
extends RefCounted

# --- UPDATED CONSTANTS ---
const BASE_DATAPACKS_PATH = "user://datapacks/"
const CONTENT_SUBDIR = "objects"
const METADATA_FILENAME = "config.szpack" # Renamed from METADATA_FILENAME
const DATAPACK_RESOURCE_FILENAME = "datapack.tres" # Renamed from DATAPACK_RESOURCE_FILENAME
const ASSETS_SUBDIR = "assets" # Renamed from MEDIA_SUBDIR

# --- INTERNAL STATE ---
var _saved_resources: Dictionary = {} 
var _pack_base_path: String = ""


# --- PUBLIC METHOD ---

## Saves a DatapackModel and all its content resources to the file system.
## 'pack_name' is used to create the final folder structure: user://datapacks/[pack_name]/
func save_datapack(datapack: DatapackModel, pack_name: String) -> bool:
	var full_pack_name = pack_name.validate_node_name()
	if full_pack_name.is_empty():
		push_error("DatapackCreator: Invalid pack_name provided.")
		return false
		
	_pack_base_path = BASE_DATAPACKS_PATH + full_pack_name + "/"
	
	var content_path = _pack_base_path + CONTENT_SUBDIR
	var assets_path = _pack_base_path + ASSETS_SUBDIR
	
	var success_dirs = true
	success_dirs &= _make_dir_recursive_safe(_pack_base_path)
	success_dirs &= _make_dir_recursive_safe(content_path)
	success_dirs &= _make_dir_recursive_safe(assets_path)
	
	if not success_dirs:
		push_error("DatapackCreator: Failed to create necessary directories.")
		return false
	
	_saved_resources.clear()

	if not _save_content_objects(datapack.content_objects, content_path + "/"):
		return false
	
	var main_resource_path = _pack_base_path + DATAPACK_RESOURCE_FILENAME
	if not _save_single_resource(datapack, main_resource_path):
		return false
		
	if not _write_metadata_file(datapack, _pack_base_path + METADATA_FILENAME):
		return false

	print("Datapack saved successfully to: %s" % _pack_base_path)
	return true


# --- PRIVATE HELPER METHODS ---

func _make_dir_recursive_safe(path: String) -> bool:
	var error = DirAccess.make_dir_recursive_absolute(path)
	if error != OK and error != ERR_ALREADY_EXISTS:
		push_error("DirAccess: Failed to create directory: %s (Error: %s)" % [path, error])
		return false
	return true


func _save_content_objects(objects: Array, save_path: String) -> bool:
	var success = true
	for obj in objects:
		if not obj is SzObject:
			push_error("DatapackCreator: Content array contains non-SzObject: %s" % obj)
			success = false
			continue

		# Filename format: [class_name]_[id].tres
		var filename = "%s_%s.tres" % [obj.get_class().to_lower(), obj.id.to_lower()]
		var full_path = save_path + filename
		
		if not _save_single_resource(obj, full_path):
			success = false
			
	return success


func _save_single_resource(resource: Resource, path: String) -> bool:
	if _saved_resources.has(resource):
		return true

	var error = ResourceSaver.save(resource, path, ResourceSaver.FLAG_COMPRESS | ResourceSaver.FLAG_CHANGE_PATH)
	
	if error != OK:
		push_error("DatapackCreator: Failed to save resource at path '%s'. Error: %s" % [path, error])
		return false
		
	_saved_resources[resource] = path
	return true


func _write_metadata_file(datapack: DatapackModel, path: String) -> bool:
	var config = ConfigFile.new()
	var section = "Datapack"
	
	config.set_value(section, "guid", datapack.guid.to_string())
	config.set_value(section, "name", datapack.name)
	config.set_value(section, "version", datapack.version)
	config.set_value(section, "entry_point", DATAPACK_RESOURCE_FILENAME)
	
	var error = config.save(path)
	if error != OK:
		push_error("DatapackCreator: Failed to save metadata file at path '%s'. Error: %s" % [path, error])
		return false
		
	return true