extends Node
## Saved level, which drops by one for every Params.LOSE_HOURS the player stays away.

const PATH := "user://progress.cfg"

## Level the next game scene starts at.
var current_level := 0


func save_level(level: int) -> void:
	var config := ConfigFile.new()
	config.set_value("progress", "level", level)
	config.set_value("progress", "time", Time.get_unix_time_from_system())
	config.save(PATH)


## Applies any decay since the last save and returns [level, hours until the next decay].
func load_level() -> Array:
	var config := ConfigFile.new()
	config.load(PATH)
	var level: int = config.get_value("progress", "level", 0)
	var last: float = config.get_value("progress", "time", 0.0)
	var now := Time.get_unix_time_from_system()
	var period := 3600.0 * Params.LOSE_HOURS
	var remaining := period + last - now
	while remaining < 0.0 and level > 0:
		last += period
		level -= 1
		remaining = period + last - now
	config.set_value("progress", "level", level)
	config.set_value("progress", "time", last)
	config.save(PATH)
	return [level, remaining / 3600.0]