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

namespace Core
{
    public class ScenesManager : MonoSingleton<ScenesManager>
    {
        private string currentGameplayScene;
        private bool isLoadGameplayUI = false;

        // 修正：直接根据当前激活场景判断
        public bool IsInMainMenu =>
            currentGameplayScene == "StartMenu";

        // 修正：只有当已有记录的 gameplay 场景且激活场景与之匹配时才返回 true
        public bool IsInGameplay =>
            currentGameplayScene == "Level1" || currentGameplayScene == "Test";

        public bool IsActiveScene(string sceneName)
        {
            return SceneManager.GetActiveScene().name == sceneName;
        }

        public bool IsSceneLoaded(string sceneName)
        {
            return SceneManager.GetSceneByName(sceneName).isLoaded;
        }

        public void LoadMainMenu()
        {
            if (isLoadGameplayUI)
            {
                StartCoroutine(UnloadScene("UIScene"));
                isLoadGameplayUI = false;
            }

            StartCoroutine(SwitchGameplay("StartMenu"));
        }

        public void LoadGameplay(string sceneName)
        {
            StartCoroutine(SwitchGameplay(sceneName));
            ReLoadUIScene();
        }
        
        public void ReLoadUIScene()
        {
            if (isLoadGameplayUI)
            {
                StartCoroutine(UnloadScene("UIScene"));
            }
            StartCoroutine(LoadSceneAdditive("UIScene"));
            isLoadGameplayUI = true;
        }

        private IEnumerator SwitchGameplay(string newScene)
        {
            if (!string.IsNullOrEmpty(currentGameplayScene))
            {
                yield return UnloadScene(currentGameplayScene);
            }

            yield return LoadSceneAdditive(newScene);
            currentGameplayScene = newScene;
            // 可选：将新场景设置为激活场景
            SceneManager.SetActiveScene(SceneManager.GetSceneByName(newScene));
        }

        private IEnumerator LoadSceneAdditive(string sceneName)
        {
            var async = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Additive);
            while (!async.isDone)
            {
                yield return null;
            }
        }
        
        private IEnumerator UnloadScene(string sceneName)
        {
            var async = SceneManager.UnloadSceneAsync(sceneName);
            while (!async.isDone)
            {
                yield return null;
            }
        }
    }
}