using System.Collections;
using UI;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace State.Game
{
    public class MainMenuState : MainGameState
    {
        private MainMenu _mainMenuInstance;
        public override void OnEnter(Machine machine)
        {
            base.OnEnter(machine);
            var handle = SceneManager.LoadSceneAsync("MainMenu", LoadSceneMode.Additive);
            machine.StartCoroutine(LoadMenu(handle));
        }

        private IEnumerator LoadMenu(AsyncOperation handle)
        {
            while (!handle.isDone)
            {
                yield return null;
            }
            
            SceneManager.SetActiveScene(SceneManager.GetSceneByName("MainMenu"));
            _mainMenuInstance = Object.Instantiate(MainStateMachine.MainMenuPrefab).GetComponent<MainMenu>();
            if (_mainMenuInstance == null)
            {
                Debug.LogError("Error: MainMenu instance is null");
            }

            _mainMenuInstance.OnStartGame += HandleStartGame;
            _mainMenuInstance.OnExitGame += () =>
            {
#if UNITY_EDITOR
                UnityEditor.EditorApplication.isPlaying = false;
#else
                Application.Quit();
#endif
            };
        }

        public override void OnExit()
        {
            Object.Destroy(_mainMenuInstance.gameObject);
            base.OnExit();
        }

        private void HandleStartGame()
        {
            _mainMenuInstance.OnStartGame -= HandleStartGame;
        }
    }
}