class_name MainMenu extends Panel

@onready var new_game_button: Button = $PanelContainer/NewGameButton
@onready var continue_button: Button = $PanelContainer/ContinueGameButton
@onready var load_game_button: Button = $PanelContainer/LoadGameButton
@onready var settings_button: Button = $PanelContainer/SettingsButton
@onready var settings_popup: SettingsPopup = %SettingsPopup
@onready var credits_button: Button = $PanelContainer/CreditsButton
@onready var quit_button: Button = $PanelContainer/QuitButton
@onready var save_game_list: SaveGameList = %SaveGameList

signal success

func execute() -> void:
	print_debug("main_menu.gd: execute()")
	modulate.a = 0.0
	assert(is_node_ready(), "MainMenu node not ready yet! (???)")
	
	if State.save_game == null or State.save_game.current_room == 0:
		continue_button.visible = false
		continue_button.disabled = true
		new_game_button.theme_type_variation = "H1Button"
	else:
		continue_button.visible = true
		continue_button.disabled = false
		new_game_button.theme_type_variation = ""

	_activate()
	await _appear()
	await success
	await _vanish()

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	print_debug("main_menu.gd: ready()")
	_deactivate()

	continue_button.pressed.connect(_start_game)
	new_game_button.pressed.connect(_new_game)
	load_game_button.pressed.connect(_load_save_game)
	settings_button.pressed.connect(settings_popup.show_settings)
	#credits_button.pressed.connect(_choose.bind("credits")) #FIXME: Needs some other encoding, like path
	quit_button.pressed.connect(get_tree().quit)

func _new_game() -> void:
	print_debug("main_menu.gd: start_new_game()")
	State.save_game = SaveGame.new()
	_start_game()


func _start_game() -> void:
	print_debug("main_menu.gd: _start_game()")
	success.emit()	
	await Main.start_game(State.save_game)
	

func _load_save_game() -> void:
	print_debug("main_menu.gd: _load_save_game()")
	var save: SaveGame = await save_game_list.pick_save_slot()
	if (save != null):
		State.save_game = save
		_deactivate()
		_start_game()
	else:
		_activate()


func _activate() -> void:
	load_game_button.disabled = not save_game_list.has_more_saves()
	continue_button.disabled = (State.save_game == null or State.save_game.is_empty)

	load_game_button.disabled = not save_game_list.has_more_saves()

	for child: Control in $PanelContainer.get_children():
		child.focus_mode = Control.FOCUS_ALL
		child.modulate = Color.WHITE

	if continue_button.visible:
		continue_button.grab_focus()
	else:
		new_game_button.grab_focus()

	visible = true

func _deactivate() -> void:
	for child: Control in $PanelContainer.get_children():
		child.focus_mode = FOCUS_NONE
		child.modulate = Color.WEB_GRAY


func _appear() -> void:
	modulate.a = 0
	visible = true
	show()
	var tween := create_tween()
	tween.tween_property(self, "modulate:a", 1.0, 0.5)
	await tween.finished
	
func _vanish() -> void:
	var tween := create_tween()
	tween.tween_property(self, "modulate:a", 0.0, 0.5)
	await tween.finished
	hide()
	visible = false