using UnityEngine;
using UnityEngine.SceneManagement;
using System.Runtime.InteropServices;

public class SceneManager : MonoBehaviour, IMethodHandler
{
    // // 声明JavaScript函数用于调试
    // [DllImport("__Internal")]
    // private static extern void DebugToConsole(string message);
    // WebGL 平台的外部 JavaScript 调用
#if UNITY_WEBGL && !UNITY_EDITOR
    [DllImport("__Internal")]
    private static extern void UnityCallback(string callbackName, string tag, string data);
#else
    // 非 WebGL 或编辑器模式下的模拟实现
    private static void UnityCallback(string callbackName, string tag, string data)
    {
        Debug.Log($"UnityCallback called with: {callbackName} {tag} {data}");
    }
#endif

    [System.Serializable]
    public class SceneLoadData
    {
        public string sceneName;
        public string callbackName;
    }

    // 保持单例模式
    // public static SceneManager Instance { get; private set; }

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

    //     Instance = this;
    //     DontDestroyOnLoad(gameObject);
    // }

    // 供JavaScript调用的场景加载方法
    public void LoadSceneFromJS(string sceneStr)
    {
        try
        {
            Debug.Log($"Received scene load request: {sceneStr}");
            SceneLoadData sceneLoadData = JsonUtility.FromJson<SceneLoadData>(sceneStr);
            StartCoroutine(LoadSceneAsync(sceneLoadData.sceneName));
            UnityCallback(sceneLoadData.callbackName, sceneLoadData.sceneName, "");
            Debug.Log($"Scene {sceneLoadData.sceneName} loaded successfully");
        }
        catch (System.Exception e)
        {
#if UNITY_WEBGL && !UNITY_EDITOR
            // DebugToConsole($"Error loading scene: {e.Message}");
#else
            Debug.LogError($"Error loading scene: {e.Message}");
#endif
        }
    }

    public void HandleMethod(string methodName, string jsonParameter)
    {
        Debug.Log($"Received method call: {methodName} with parameter: {jsonParameter}");
        switch (methodName)
        {
            case "LoadSceneFromJS":
                LoadSceneFromJS(jsonParameter);
                break;

            default:
                Debug.LogWarning($"Unknown method: {methodName}");
                break;
        }
    }

    private System.Collections.IEnumerator LoadSceneAsync(string sceneName)
    {
        // #if UNITY_WEBGL && !UNITY_EDITOR
        // DebugToConsole($"Starting to load scene: {sceneName}");
        // #endif

        AsyncOperation asyncLoad = UnityEngine.SceneManagement.SceneManager.LoadSceneAsync(sceneName);

        while (!asyncLoad.isDone)
        {
            float progress = Mathf.Clamp01(asyncLoad.progress / 0.9f);

            // #if UNITY_WEBGL && !UNITY_EDITOR
            // DebugToConsole($"Loading progress: {progress * 100}%");
            // #endif

            yield return null;
        }

        // #if UNITY_WEBGL && !UNITY_EDITOR
        // DebugToConsole($"Scene {sceneName} loaded successfully");
        // #endif
    }

    // 可选：获取当前场景名称的方法
    public string GetCurrentSceneName()
    {
        return UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;
    }
}