class_name RootUI
extends CanvasLayer

@export var startup_scene:PackedScene
@export var game_scene:PackedScene

@onready var ui_panels:Array = [ %MainMenuUI, %NewGameUI, %GameUI, %GameMenuUI ]
@onready var active_ui_panel:Control = null

@onready var inventory_dialog:InventoryDialog = %InventoryDialog
@onready var scene = %Scene

enum ROOT_UI_STATE { UNDEFINED, MENU, GAME }
var _root_ui_state:ROOT_UI_STATE = ROOT_UI_STATE.UNDEFINED
var _all_recipes:Array[Recipe] = []
var _player:Player = null

var current_level_resource:String

# Called when the node enters the scene tree for the first time.
func _ready():
	for file in DirAccess.get_files_at("res://data/recipes"):
		var resource_file = "res://data/recipes/" + file
		var recipe:Recipe = load(resource_file) as Recipe
		_all_recipes.append(recipe)
	
	set_root_ui_state(ROOT_UI_STATE.GAME)

func activate_ui_panel(ui_panel:Control):
	for control in ui_panels:
		if control == ui_panel:
			control.visible = true
		else:
			control.visible = false
	
	active_ui_panel = ui_panel

func disconnect_player_signals():
	_player.disconnect("trigger_message", %GameUI._on_player_trigger_message)

func update_player_signals():
	_player.connect("trigger_message", %GameUI._on_player_trigger_message)

func load_scene(scene_resource:PackedScene):
	if _player:
		disconnect_player_signals()
	
	for child in scene.get_children():
		child.queue_free()
		child.get_parent().remove_child(child)
	
	print("Loading level '" + scene_resource.resource_path + "'")
	scene.add_child(scene_resource.instantiate())
	current_level_resource = scene_resource.resource_path
	
	for pickup_item in get_tree().get_nodes_in_group("pickup_item"):
		pickup_item.connect("item_picked_up", get_parent().on_item_pickup)
	
	_player = scene.find_child("Player", true, false)

	if _player:
		update_player_signals()


func set_root_ui_state(state:ROOT_UI_STATE):
	if _root_ui_state == state:
		return
	
	if state == ROOT_UI_STATE.GAME:
		load_scene(game_scene)
		%GameUI.game_scene = scene.get_child(0)
		activate_ui_panel(%GameUI)
	else:
		load_scene(startup_scene)
		%GameUI.game_scene = null
		%GameMenuUI.hide()
		activate_ui_panel(%MainMenuUI)
	
	_root_ui_state = state

func _on_start_game_button_pressed():
	set_root_ui_state(ROOT_UI_STATE.GAME)


func _on_quit_button_pressed():
	get_tree().quit()


func _on_new_game_button_pressed():
	activate_ui_panel(%NewGameUI)


func _to_main_menu_button_pressed():
	set_root_ui_state(ROOT_UI_STATE.MENU)


func _unhandled_input(event):
	if event.is_action_released("toggle_inventory"):
		inventory_dialog.open(_all_recipes, _player.inventory)