extends Node
# save_game.gd - Responsible for saving and loading the game using a SaveData resource

const SAVE_GAME_PATH := "user://savegame.save"
const VERSION: int = 1

# List all the nodes and resouces to save
var save_data: Resource = SaveData.new()

func save() -> void:
	var save_file = FileAccess.open(SAVE_GAME_PATH, FileAccess.WRITE)
	
	# Save the meta data like save game version and timestamps
	var meta_data = {
		"meta": {
			"version" : VERSION,
			"timestamp" : Time.get_datetime_string_from_system()
		}
	}
	var meta_json_string = JSON.stringify(meta_data)
	save_file.store_line(meta_json_string)
	
	# for now, only save the savedata resource from above
	if !save_data.has_method("save"):
		print("Resource '%s' is missing a save() function, skipped" %save_data.resource_name)
		return

	# Call the node's / resource's save function
	var node_data = save_data.call("save")
	
	# Serialize the JSON string
	var json_string = JSON.stringify(node_data)
	
	# Store the save dictionary as a new line in the save file
	save_file.store_line(json_string)

func load() -> void:
	if not FileAccess.file_exists(SAVE_GAME_PATH):
		print("No save file exists.")
		return
	
	# Load the save file line by line and process the dictionary to restore
	# the object it represents
	var save_file = FileAccess.open(SAVE_GAME_PATH, FileAccess.READ)
	while save_file.get_position() < save_file.get_length():
		var json_string = save_file.get_line()
		
		# Creates the helper class to interact with JSON
		var json = JSON.new()
		
		# Check if there is any error while parsing the JSON string, skip in case of failure
		var parse_result = json.parse(json_string)
		if not parse_result == OK:
			print("JSON Parse Error: ", json.get_error_message(), " in ", json_string, " at line", json.get_error_line())
			continue
		
		# Get the data from the JSON object
		var node_data = json.get_data()
		
		# handle the player data (name, money, etc.)
		if node_data.has("player_data"):
			print("save_game.gd: ", node_data)
		
		# Firstly, we need to create the object and add it to the tree and set its position.
		#var new_object = load(node_data["filename"]).instantiate()
		#get_node(node_data["parent"]).add_child(new_object)
		#new_object.position = Vector2(node_data["pos_x"], node_data["pos_y"])

		# Now we set the remaining variables.
		#for i in node_data.keys():
		#	if i == "filename" or i == "parent" or i == "pos_x" or i == "pos_y":
		#		continue
		#	new_object.set(i, node_data[i])