tool
class_name NewGamePanel
extends PopupPanel

signal start_triggered(config)

const pref_path = "user://preferences.cfg"

export var window_scale_factor = 0.9 # how big the popup will be compared to screen

var preferences = ConfigFile.new()
var fade_duration = 0.2
var fade_scale_factor = 0.9

onready var tween = $Tween

func _init():
	var err = preferences.load(pref_path)

func _ready():
	pass

func fade_out():
	tween.remove_all()
	tween.interpolate_property(self, "rect_scale", Vector2(1.0, 1.0), Vector2(fade_scale_factor, fade_scale_factor), fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	var scaled_center_position: Vector2 = (OS.window_size - (rect_size * fade_scale_factor)) / 2
	tween.interpolate_property(self, "rect_position", rect_position, scaled_center_position, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_property(self, "modulate:a", 1.0, 0.0, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_callback(self, fade_duration, "hide")
	tween.start()

func _on_Cancel_pressed():
	fade_out()

func _on_Start_pressed():
	if $Panel/HBoxContainer/Easy.pressed:
		preferences.set_value("game", "difficulty", "easy")
	if $Panel/HBoxContainer/Normal.pressed:
		preferences.set_value("game", "difficulty", "normal")
	if $Panel/HBoxContainer/Hard.pressed:
		preferences.set_value("game", "difficulty", "hard")

	preferences.save(pref_path)

	emit_signal("start_triggered", preferences)
	fade_out()

func _on_NewGamePanel_about_to_show():
	$Panel/HBoxContainer/Easy.pressed = false
	$Panel/HBoxContainer/Normal.pressed = false
	$Panel/HBoxContainer/Hard.pressed = false

	var difficulty = preferences.get_value("game", "difficulty", "normal")
	match difficulty:
		"easy":
			$Panel/HBoxContainer/Easy.pressed = true
		"normal":
			$Panel/HBoxContainer/Normal.pressed = true
		"hard":
			$Panel/HBoxContainer/Hard.pressed = true
		_:
			assert("Invalid value")
			$Panel/HBoxContainer/Normal.pressed = true

	$Panel/Start.grab_focus()

	var size = OS.window_size * window_scale_factor
	tween.interpolate_property(self, "rect_scale", Vector2(fade_scale_factor, fade_scale_factor), Vector2(1.0, 1.0), fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	var original_position: Vector2 = (OS.window_size - size) / 2
	var scaled_center_position: Vector2 = (OS.window_size - (size * fade_scale_factor)) / 2
	tween.interpolate_property(self, "rect_position", scaled_center_position, original_position, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.interpolate_property(self, "modulate:a", 0.0, 1.0, fade_duration, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.start()