extends CanvasLayer

## 「房★主★有★神★器★」：把两个调试功能（飞行 / 跳关）藏在一个彩蛋按钮里。
##
## 平时屏幕上只有右上角一个小小的「房★主★有★神★器★」按钮，
## 点一下才弹出面板，里面是飞行开关和跳关按钮。
## 面板打开时键盘 1/2/3 也能跳关，Esc 或再点一次按钮关闭。
## 正式版里也能用（这是刻意留的彩蛋，不是调试残留）。

@export var levels: Array[String] = [
	"res://scenes/main.tscn",
	"res://scenes/level2.tscn",
	"res://scenes/level3.tscn",
]
## 是否显示那个彩蛋按钮（关掉的话就只能靠别的方式打开面板了）
@export var show_button: bool = true

var _panel: Control = null
var _open_button: Button = null
var _fly_button: Button = null
var _player: Node = null
var _open: bool = false


func _ready() -> void:
	visible = true
	_panel = get_node_or_null("Panel")
	_open_button = get_node_or_null("OpenButton")
	_fly_button = get_node_or_null("Panel/VBox/FlyButton")

	if _open_button != null:
		_open_button.visible = show_button
		_open_button.pressed.connect(toggle_panel)

	var close := get_node_or_null("Panel/VBox/CloseButton")
	if close != null:
		close.pressed.connect(toggle_panel)

	if _fly_button != null:
		_fly_button.pressed.connect(toggle_fly)

	var row := get_node_or_null("Panel/VBox/Row")
	if row != null:
		var index := 1
		for path in levels:
			var btn := Button.new()
			btn.text = str(index)
			btn.custom_minimum_size = Vector2(26.0, 24.0)
			btn.focus_mode = Control.FOCUS_NONE
			btn.add_theme_font_size_override("font_size", 12)
			btn.pressed.connect(jump_to.bind(path))
			row.add_child(btn)
			index += 1

	if _panel != null:
		_panel.visible = false


func _process(_delta: float) -> void:
	if _fly_button == null:
		return
	if _player == null or not is_instance_valid(_player):
		_player = get_tree().get_first_node_in_group("player")
	if _player == null:
		_fly_button.text = "飞行（F）"
		return
	_fly_button.text = "飞行：开（F）" if bool(_player.flying) else "飞行：关（F）"


func _unhandled_input(event: InputEvent) -> void:
	if not _open:
		return
	var key := event as InputEventKey
	if key == null or not key.pressed or key.echo:
		return
	if key.physical_keycode == KEY_ESCAPE:
		toggle_panel()
		return
	var n := 0
	match key.physical_keycode:
		KEY_1:
			n = 1
		KEY_2:
			n = 2
		KEY_3:
			n = 3
		KEY_4:
			n = 4
		KEY_5:
			n = 5
	if n >= 1 and n <= levels.size():
		jump_to(levels[n - 1])


func toggle_panel() -> void:
	_open = not _open
	if _panel != null:
		_panel.visible = _open


func toggle_fly() -> void:
	if _player == null or not is_instance_valid(_player):
		_player = get_tree().get_first_node_in_group("player")
	if _player == null or not _player.has_method("set_flying"):
		return
	_player.set_flying(not bool(_player.flying))


func jump_to(path: String) -> void:
	get_tree().paused = false
	get_tree().change_scene_to_file(path)