extends Control

var normal_boot : bool = false

@export_file(".tscn") var youth_room_path: String
@export_file(".tscn") var transition_room_path: String
@export_file(".tscn") var adulthood_room_path: String
@export_file(".tscn") var ending_path: String

@onready var curtain: Curtain = %Curtain
@onready var credits_roll: Control = %CreditsRoll
@onready var main_menu: MainMenu = %MainMenu
@onready var pause_menu: PauseManu = %PauseMenu

@onready var room_paths := {
	State.rooms.NULL: youth_room_path, # Maybe Draeven story?
	State.rooms.YOUTH: youth_room_path,
	State.rooms.TRANSITION: transition_room_path,
	State.rooms.ADULTHOOD: adulthood_room_path,
	State.rooms.ENDING: ending_path
}

enum AppState {BOOT, MENU, PLAY, PAUSE, CREDITS}

var app_state: AppState = AppState.BOOT:
	set(value):
		app_state = value
		print_debug("main.gd: app_state changing to: %s" % str(app_state))
		match app_state:
			AppState.BOOT:
				credits_roll.hide()
				main_menu.hide()
				pause_menu.hide()
			AppState.MENU:
				credits_roll.hide()
				pause_menu.hide()
				await main_menu.execute()
			AppState.PLAY:
				credits_roll.hide()
				main_menu.hide()
				pause_menu.hide()
				curtain.hide()
			AppState.PAUSE:
				credits_roll.hide()
				main_menu.hide()
				pause_menu.show()
			AppState.CREDITS:
				main_menu.hide()
				pause_menu.hide()
				credits_roll.play()

func _enter_tree() -> void:
	print_debug("main.gd: _enter_tree()")

func _ready() -> void:
	print_debug("main.gd: _ready()")
	await get_tree().process_frame
	main_menu.continue_button.pressed.connect(func(): app_state = AppState.PLAY)
	main_menu.credits_button.pressed.connect(func(): app_state = AppState.CREDITS)

	#TODO: Load the last savegame(?)
	await %Loading.stop()

	if normal_boot:
		print_debug("main.gd: normal boot (loading last save and showing main menu)")
		app_state = AppState.MENU
	else:
		print_debug("main.gd: direct boot (hiding menus and entering main loop)")
		app_state = AppState.PLAY


func start_game(save: SaveGame) -> void:
	print_debug("main.gd: play_game()")
	var room_path := room_paths.get(save.current_room, youth_room_path) as String
	await _load_room(room_path)
	await State.room.play()

func _load_room(next_path: String) -> bool:
	await curtain.show()
	%Loading.play()

	if State.room != null:
		State.room.unload()
		State.room = null

	ResourceLoader.load_threaded_request(next_path, "PackedScene", true)
	while true:
		await get_tree().process_frame
		var state := ResourceLoader.load_threaded_get_status(next_path)
		match state:
			ResourceLoader.THREAD_LOAD_LOADED:
				var next_scene := ResourceLoader.load_threaded_get(youth_room_path) as PackedScene
				State.room = next_scene.instantiate() as RoomTemplate
				get_tree().root.add_child(State.room)
				await State.room.get_ready()
				%Loading.stop()
				await curtain.hide()
				return true
			ResourceLoader.THREAD_LOAD_FAILED:
				push_error("Failed to load room.")
				break
	return false


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEvent:
		match app_state:
			AppState.BOOT:
				pass
			AppState.MENU:
				pass
			AppState.PLAY:
				if event.is_action_pressed("ui_menu"):
					app_state = AppState.PAUSE
			AppState.PAUSE:
				if event.is_action_pressed("ui_menu"):
					app_state = AppState.PLAY

#	if not get_tree().paused:
#		get_tree().paused = true
#		var state_machine := menu_animation["parameters/playback"]
#		state_machine.travel("reveal_pause_menu")
#		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
#	else:
#		get_tree().paused = false
#		var state_machine := menu_animation["parameters/playback"]
#		state_machine.travel("start_game")
#
#		if State.stage_list[0] is Player:
#			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

#func debug_youth():
#	get_child(1).hide()
#	get_child(2).hide()
#	get_child(3).hide()
#	get_child(0).get_ready()
#	get_child(0).start()
#
#func _return_to_menu():
#	State.active_save_game = null
#
#	menu_animation["parameters/conditions/start_game"] = false
#
#	State.pass_stage_to(main_menu)
#
#	currently_loading_room = get_room_path_from_id(main_menu.save_game_handle.get_most_recent_save().current_room)
#
#	menu_animation["parameters/conditions/return_to_menu"] = true
#	await(get_tree().create_timer(0.5).timeout)
#	menu_animation["parameters/conditions/return_to_menu"] = false
#	_on_ready_to_unload()
#
#func load_save(save: SaveGame):
#
#	if currently_loading_room != "":
#		await(room_loaded)
#
#	if save.current_room != current_room.id:
#		# TODO Prevent race condition from appearing when save is loaded while room is still loading.
#		currently_loading_room = get_room_path_from_id(save.current_room)
#		await(room_loaded)
#
#	menu_animation["parameters/conditions/start_game"] = true
#
#	State.active_save_game = save
#	in_game = true
#	current_room.start_room()
#
#func _on_ready_to_unload():
#	if get_child(0) is Node3D:
#		get_child(0).free()
#
#func get_room_path_from_id(id: State.rooms) -> String:
#	match id:
#		State.rooms.YOUTH, State.rooms.NULL:
#			return youth_room_path
#		State.rooms.TRANSITION:
#			return transition_room_path
#		State.rooms.ADULTHOOD:
#			return adulthood_room_path
#		_:
#			return ending_path
#
#func get_room_id_from_path(path: String) -> State.rooms:
#	match path:
#		youth_room_path:
#			return State.rooms.YOUTH
#		transition_room_path:
#			return State.rooms.TRANSITION
#		adulthood_room_path:
#			return State.rooms.ADULTHOOD
#		_:
#			return State.rooms.NULL
#
#
#func start_demo():
#	#FIXME this causes the room to reload
#	#load_save(SaveGame.new())
#	current_room.start_room()
#	in_game = true
#
#func pause_mode_changed():
#	print_debug(get_tree().paused)
#
#var await_swap: bool = false
#func prepare_transition(scene_id: Scenes.id, _repeat):
#	if scene_id == Scenes.id.TRANSITION:
#		await_swap = true
#		#FIXME: this does not need to be part of the sequence
#		await(get_tree().process_frame)
#		current_room.prepare_transition()
#		if not _repeat:
#			currently_loading_room = get_room_path_from_id(State.rooms.TRANSITION)
#		else:
#
#			currently_loading_room = get_room_path_from_id(State.rooms.ADULTHOOD)
#
#func transition(scene_id: Scenes.id, _repeat):
#	if scene_id == Scenes.id.TRANSITION:
#		State.reset_focus()
#		await_swap = false
#		await room_loaded
#		if not _repeat:
#			State.queue_for_stage(current_room)
#			Scenes.end_current_sequence()
#		else:
#			State.pass_stage_to(current_room)