using System.Collections;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using UnityEngine.ResourceManagement.ResourceProviders;
using UnityEngine.SceneManagement;

public static class AddressableSceneLoader
{
    public const string IntroScene = "Intro";
    public const string MainMenuScene = "MainMenu";
    public const string GameScene = "Game";

    public static void Load(string sceneName)
    {
        AddressableSceneLoadRunner.Instance.Begin(sceneName);
    }

    public static IEnumerator LoadRoutine(string sceneName)
    {
        AsyncOperationHandle<SceneInstance> handle = Addressables.LoadSceneAsync(sceneName, LoadSceneMode.Single);
        yield return handle;
        if (handle.Status != AsyncOperationStatus.Succeeded)
            Debug.LogError("Failed to load addressable scene '" + sceneName + "': " + handle.OperationException);
    }
}

public class AddressableSceneLoadRunner : MonoBehaviour
{
    static AddressableSceneLoadRunner instance;

    public static AddressableSceneLoadRunner Instance
    {
        get
        {
            if (instance != null)
                return instance;

            var go = new GameObject(nameof(AddressableSceneLoadRunner));
            DontDestroyOnLoad(go);
            instance = go.AddComponent<AddressableSceneLoadRunner>();
            return instance;
        }
    }

    void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }

        instance = this;
        DontDestroyOnLoad(gameObject);
    }

    public void Begin(string sceneName)
    {
        StartCoroutine(AddressableSceneLoader.LoadRoutine(sceneName));
    }
}