class_name MainMenuController
extends CanvasLayer
## Coordina navigazione e transizioni tra P1, P2a e P3a.

signal mode_requested
signal gym_requested
signal exit_requested

const HOME_SCENE := preload("res://menus/scenes/p1_home.tscn")
const JUGGLE_SCENE := preload("res://menus/scenes/p2a_juggle_menu.tscn")
const GYM_SCENE := preload("res://menus/scenes/p3a_gym_menu.tscn")

var screen_root: Control
var fade: ColorRect
var menu_audio: MenuAudio
var current_screen: Control
var _transitioning := false
var _capture_enabled := false
var _capture_settled := false


func _ready() -> void:
	process_mode = Node.PROCESS_MODE_ALWAYS
	layer = 20
	_capture_enabled = OS.get_cmdline_user_args().has("--capture-menus")
	_capture_settled = OS.get_cmdline_user_args().has("--capture-settled")
	_build_shell()
	visible = false


func _build_shell() -> void:
	var root := Control.new()
	root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.mouse_filter = Control.MOUSE_FILTER_STOP
	add_child(root)

	screen_root = Control.new()
	screen_root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(screen_root)

	fade = ColorRect.new()
	fade.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	fade.color = Color("#1d1720")
	fade.modulate.a = 0.0
	# Il fade è trasparente a riposo: non deve intercettare click o touch dei menu.
	fade.mouse_filter = Control.MOUSE_FILTER_IGNORE
	root.add_child(fade)

	menu_audio = MenuAudio.new()
	add_child(menu_audio)


func show_home() -> void:
	_show_direct(HOME_SCENE, "p1")


func show_juggle() -> void:
	_show_direct(JUGGLE_SCENE, "p2a")


func show_gym() -> void:
	_show_direct(GYM_SCENE, "p3a")


func hide_menu() -> void:
	visible = false
	get_tree().paused = false


func _show_direct(scene: PackedScene, capture_label: String) -> void:
	visible = true
	get_tree().paused = true
	_replace_screen(scene)
	_capture_after_frame(capture_label)


func _navigate(scene: PackedScene, capture_label: String, focal: Control = null) -> void:
	if _transitioning:
		return
	_transitioning = true
	# Durante la transizione impedisce input duplicati; torna IGNORE al termine.
	fade.mouse_filter = Control.MOUSE_FILTER_STOP
	menu_audio.play_tone(660.0)
	var tween := create_tween()
	tween.set_pause_mode(Tween.TWEEN_PAUSE_PROCESS)
	if focal:
		focal.pivot_offset = focal.size * 0.5
		tween.tween_property(focal, "scale", Vector2(1.08, 1.08), 0.16).set_trans(Tween.TRANS_BACK).set_ease(Tween.EASE_OUT)
	tween.parallel().tween_property(fade, "modulate:a", 0.92, 0.24)
	tween.tween_callback(func(): _replace_screen(scene))
	tween.tween_property(fade, "modulate:a", 0.0, 0.30)
	tween.tween_callback(func():
		_transitioning = false
		fade.mouse_filter = Control.MOUSE_FILTER_IGNORE
		_capture_after_frame(capture_label)
	)


func _replace_screen(scene: PackedScene) -> void:
	if is_instance_valid(current_screen):
		current_screen.queue_free()
	current_screen = scene.instantiate()
	screen_root.add_child(current_screen)
	_bind_screen(current_screen)


func _bind_screen(screen: Control) -> void:
	if screen is P1HomeScreen:
		screen.juggle_requested.connect(func(focal: Control): _navigate(JUGGLE_SCENE, "p2a", focal))
		screen.gym_requested.connect(func(focal: Control): _navigate(GYM_SCENE, "p3a", focal))
		screen.sign_drop_started.connect(menu_audio.play_sign_drop)
		screen.sign_landed.connect(menu_audio.play_sign_bounce)
		screen.exit_requested.connect(func():
			menu_audio.play_tone(220.0)
			exit_requested.emit()
		)
	elif screen is P2AJuggleMenuScreen:
		screen.back_requested.connect(func(): _navigate(HOME_SCENE, "p1"))
		screen.mode_requested.connect(func(): mode_requested.emit())
		screen.feedback_requested.connect(menu_audio.play_tone)
	elif screen is P3AGymMenuScreen:
		screen.back_requested.connect(func(): _navigate(HOME_SCENE, "p1"))
		screen.game_requested.connect(func(): gym_requested.emit())
		screen.feedback_requested.connect(menu_audio.play_tone)


func _capture_after_frame(label: String) -> void:
	if not _capture_enabled:
		return
	await RenderingServer.frame_post_draw
	if _capture_settled:
		await get_tree().create_timer(1.5, true, false, true).timeout
	var image := get_viewport().get_texture().get_image()
	image.save_png("/tmp/autgame_menu_%s.png" % label)