extends Control

## Intro menu: Siim's arena mockup as a looping video background with an
## overlaid Play / Options / Credits / Exit UI positioned over his sketch.
## Play fades to black and loads the game; Options rebinds controls.

const GAME_SCENE := "res://scene.tscn"
const FADE_TIME := 0.6

## Friendly labels for the rebindable actions (order defines list order).
const ACTION_LABELS: Dictionary = {
	&"move_forward": "Move Forward",
	&"move_back": "Move Back",
	&"move_left": "Move Left",
	&"move_right": "Move Right",
	&"charge": "Charge",
	&"ability_kick": "Kick",
	&"ability_slam": "Slam",
	&"ability_dash": "Dash",
}

@onready var main_panel: Control = $MainPanel
@onready var options_panel: Control = $OptionsPanel
@onready var credits_panel: Control = $CreditsPanel
@onready var rebind_list: VBoxContainer = $OptionsPanel/VBox/Scroll/RebindList
@onready var fade_rect: ColorRect = $FadeRect
@onready var play_button: Button = $MainPanel/PlayButton
@onready var options_button: Button = $MainPanel/OptionsButton
@onready var credits_button: Button = $MainPanel/CreditsButton
@onready var exit_button: Button = $MainPanel/ExitButton
@onready var options_back: Button = $OptionsPanel/VBox/BackButton
@onready var credits_back: Button = $CreditsPanel/VBox/BackButton
@onready var video: VideoStreamPlayer = $VideoStreamPlayer

var _listening_action: StringName = &""
var _listening_button: Button = null


func _ready() -> void:
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	options_panel.visible = false
	credits_panel.visible = false
	fade_rect.color = Color(0, 0, 0, 0)
	if video.stream != null:
		video.play()
	video.finished.connect(video.play)  # loop the background clip

	play_button.pressed.connect(_on_play_pressed)
	options_button.pressed.connect(_on_options_pressed)
	credits_button.pressed.connect(_on_credits_pressed)
	exit_button.pressed.connect(_on_exit_pressed)
	options_back.pressed.connect(_close_subpanels)
	credits_back.pressed.connect(_close_subpanels)
	_build_rebind_rows()
	play_button.grab_focus()


func _build_rebind_rows() -> void:
	for child in rebind_list.get_children():
		child.queue_free()
	for action: StringName in ACTION_LABELS:
		var row := HBoxContainer.new()
		row.size_flags_horizontal = Control.SIZE_EXPAND_FILL

		var name_label := Label.new()
		name_label.text = ACTION_LABELS[action]
		name_label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		name_label.add_theme_color_override("font_outline_color", Color.BLACK)
		name_label.add_theme_constant_override("outline_size", 4)
		row.add_child(name_label)

		var key_button := Button.new()
		key_button.custom_minimum_size = Vector2(160, 0)
		key_button.text = Controls.get_key_label(action)
		key_button.pressed.connect(_on_rebind_pressed.bind(action, key_button))
		row.add_child(key_button)

		rebind_list.add_child(row)


func _on_play_pressed() -> void:
	_set_buttons_disabled(true)
	var tween := create_tween()
	tween.tween_property(fade_rect, "color:a", 1.0, FADE_TIME)
	tween.tween_callback(func() -> void:
		get_tree().change_scene_to_file(GAME_SCENE))


func _on_options_pressed() -> void:
	main_panel.visible = false
	options_panel.visible = true
	options_back.grab_focus()


func _on_credits_pressed() -> void:
	main_panel.visible = false
	credits_panel.visible = true
	credits_back.grab_focus()


func _on_exit_pressed() -> void:
	get_tree().quit()


func _close_subpanels() -> void:
	_cancel_listening()
	options_panel.visible = false
	credits_panel.visible = false
	main_panel.visible = true
	play_button.grab_focus()


func _set_buttons_disabled(value: bool) -> void:
	play_button.disabled = value
	options_button.disabled = value
	credits_button.disabled = value
	exit_button.disabled = value


func _on_rebind_pressed(action: StringName, button: Button) -> void:
	_cancel_listening()
	_listening_action = action
	_listening_button = button
	button.text = "Press a key…"


func _cancel_listening() -> void:
	if _listening_button != null:
		_listening_button.text = Controls.get_key_label(_listening_action)
	_listening_action = &""
	_listening_button = null


func _unhandled_input(event: InputEvent) -> void:
	if _listening_action == &"":
		return
	if event is InputEventKey and event.pressed and not event.echo:
		if event.physical_keycode == KEY_ESCAPE:
			_cancel_listening()
		else:
			var new_event := InputEventKey.new()
			new_event.physical_keycode = event.physical_keycode
			Controls.rebind(_listening_action, new_event)
			_listening_button.text = Controls.get_key_label(_listening_action)
			_listening_action = &""
			_listening_button = null
		get_viewport().set_input_as_handled()