class_name GameHost
extends Node


signal game_loaded(game: ArcadeGame)
signal game_unloaded


var current_game: ArcadeGame


func load_game(game_definition: GameDefinition) -> ArcadeGame:
	unload_game()

	if game_definition == null:
		push_error("GameHost received a null GameDefinition.")
		return null

	if game_definition.scene == null:
		push_error(
			"Game '%s' has no scene assigned."
			% game_definition.game_id
		)
		return null

	var instance := game_definition.scene.instantiate()

	if not instance is ArcadeGame:
		push_error(
			"Game scene '%s' does not inherit from ArcadeGame."
			% game_definition.game_id
		)

		instance.queue_free()
		return null

	current_game = instance as ArcadeGame

	add_child(current_game)

	current_game.game_started.connect(_on_game_started)
	current_game.game_won.connect(_on_game_won)
	current_game.game_lost.connect(_on_game_lost)
	current_game.game_reset.connect(_on_game_reset)

	game_loaded.emit(current_game)

	print(
		"[GAME HOST] Loaded '%s'"
		% game_definition.display_name
	)

	return current_game


func unload_game() -> void:
	if current_game == null:
		return

	print("[GAME HOST] Unloading current game.")

	current_game.queue_free()
	current_game = null

	game_unloaded.emit()


func _on_game_started() -> void:
	RoomRuntime.fire_game_event(GameEvents.STARTED)


func _on_game_won() -> void:
	RoomRuntime.fire_game_event(GameEvents.WON)


func _on_game_lost() -> void:
	RoomRuntime.fire_game_event(GameEvents.LOST)


func _on_game_reset() -> void:
	RoomRuntime.fire_game_event(GameEvents.RESET)