extends Node

# currently-used compatible format version
const FORMAT_VERSION: int = 1

# contains the save data for a single level
class LevelSaveData:
	# save file category to use for this level
	var save_id: String
	# scores
	var score_any: int = 0
	var score_100: int = 0
	# times
	var time_any: float = INF
	var time_100: float = INF
	# times died in that level
	var deaths: int
	# collectibles
	var keys_collected: int = 0
	var shards_collected: Array
	# whether level has been beaten at all
	var completed: bool = false
	
	func _init(id: String) -> void:
		save_id = id
		# initialize shards array
		shards_collected = []
		shards_collected.resize(8)
		for i in 8:
			shards_collected[i] = false
	
	## save the level data to the given ConfigFile
	func save_to_file(file: ConfigFile) -> void:
		# set scores
		file.set_value(save_id, "score_any", score_any)
		file.set_value(save_id, "score_100", score_100)
		# set times
		file.set_value(save_id, "time_any", time_any)
		file.set_value(save_id, "time_100", time_100)
		# set deaths
		file.set_value(save_id, "deaths", deaths)
		# set collected keys
		file.set_value(save_id, "keys", keys_collected)
		# set collected shards
		for i in 8:
			file.set_value(save_id, "shard_%d" % i, shards_collected[i])
		# set completion status
		file.set_value(save_id, "completed", completed)
	
	## loads level data from the given ConfigFile
	func load_from_file(file: ConfigFile) -> void:
		# get scores
		score_any = file.get_value(save_id, "score_any", 0)
		score_100 = file.get_value(save_id, "score_100", 0)
		# get times
		time_any = file.get_value(save_id, "time_any", INF)
		time_100 = file.get_value(save_id, "time_100", INF)
		# get deaths
		deaths = file.get_value(save_id, "deaths", 0)
		# get collected keys
		keys_collected = file.get_value(save_id, "keys", keys_collected)
		# get collected shards
		for i in 8:
			shards_collected[i] = file.get_value(save_id, "shard_%d" % i, false)
		# get completion status
		completed = file.get_value(save_id, "completed", false)

# contains data of one save file
class SaveFile:
	# path of file to load/save from
	var file_path: String
	# version of save file format
	var version: int = FORMAT_VERSION
	# name of the save file
	var name: String = ""
	# difficulty chosen for the file
	var difficulty: int = Game.Difficulty.SPICY
	# total play time
	var play_time: float = 0.0
	# dictionary of levels' save data
	var levels: Dictionary
	# whether is debug save
	var debug: bool = false
	# palette the save file is using
	var palette: String = "default"
	
	func _init(path: String, debug_save: bool = false) -> void:
		debug = debug_save
		file_path = path
		# initialize level save data dictionary
		levels = {}
		for level in LevelData.levels:
			levels[level.save_id] = LevelSaveData.new(level.save_id)
	
	# return total number of shards
	func get_total_shards() -> int:
		if debug:
			return 999
		var total = 0
		for level in levels.values():
			total += level.shards_collected.count(true)
		return total
	
	# return total number of keys
	func get_total_keys() -> int:
		var total = 0
		for level in levels.values():
			total += level.keys_collected
		return total
	
	# return total number of deaths
	func get_total_deaths() -> int:
		var total = 0
		for level in levels.values():
			total += level.deaths
		return total
	
	# loads data from the file at `path`
	func load_from_file() -> void:
		var file = ConfigFile.new()
		file.load(file_path)
		# get save format version
		version = file.get_value("options", "version", 0)
		# load name
		name = file.get_value("options", "name", "SG")
		# load difficulty
		difficulty = file.get_value("options", "difficulty", Game.Difficulty.SPICY)
		# load playtime
		play_time = file.get_value("options", "play_time", 0.0)
		palette = file.get_value("options", "palette", "default")
		# TODO: load bought palettes
		# TODO: load selected palette
		# load level save data
		for level_save in levels.values():
			level_save.load_from_file(file)
	
	func save_to_file() -> void:
		var file = ConfigFile.new()
		# use current format version
		file.set_value("options", "version", FORMAT_VERSION)
		# save name
		file.set_value("options", "name", name)
		# save difficulty
		file.set_value("options", "difficulty", difficulty)
		# save playtime
		file.set_value("options", "play_time", play_time)
		file.set_value("options", "palette", palette)
		# TODO: save bought palettes
		# TODO: save selected palette
		# save level data
		for level in levels.values():
			level.save_to_file(file)
		file.save(file_path)


## currently used save file
var current_file: SaveFile = null

func _ready() -> void:
	if OS.is_debug_build():
		current_file = SaveFile.new("user://debug_save.pr", true)
	else:
		current_file = load_file("user://file%d.pr" % Options.last_file)
		if current_file:
			Game.difficulty = current_file.difficulty

## shortcut for loading a save file from specific path
func load_file(path: String) -> SaveFile:
	if File.new().file_exists(path):
		var file = SaveFile.new(path)
		file.load_from_file()
		return file
	else:
		return null