using System;
using System.Runtime.InteropServices;
using Cysharp.Threading.Tasks;
using UnityEngine;

/// <summary>
/// 抖音小游戏平台实现
/// </summary>
public class DouyinPlatform : IPlatformService
{
    #if UNITY_WEBGL && !UNITY_EDITOR
    // JavaScript 插件方法声明
    [DllImport("__Internal")]
    private static extern bool TT_Init();
    
    [DllImport("__Internal")]
    private static extern void TT_Login(string callbackObjectName, string callbackMethodName);
    
    [DllImport("__Internal")]
    private static extern string TT_GetSystemInfo();
    
    [DllImport("__Internal")]
    private static extern void TT_ShareAppMessage(string title, string imageUrl);
    
    [DllImport("__Internal")]
    private static extern void TT_CreateRewardedVideoAd(string adUnitId, string callbackObjectName, string callbackMethodName);
    
    [DllImport("__Internal")]
    private static extern void TT_SetStorageSync(string key, string value);
    
    [DllImport("__Internal")]
    private static extern string TT_GetStorageSync(string key);
    
    [DllImport("__Internal")]
    private static extern void TT_VibrateShort();
    
    [DllImport("__Internal")]
    private static extern void TT_VibrateLong();
    #endif
    
    private SystemInfo _cachedSystemInfo;
    private bool _isInitialized = false;
    
    public async UniTask<bool> InitAsync()
    {
        Debug.Log("[DouyinPlatform] 初始化抖音小游戏平台");
        
        #if UNITY_WEBGL && !UNITY_EDITOR
        try
        {
            _isInitialized = TT_Init();
            if (_isInitialized)
            {
                _cachedSystemInfo = GetSystemInfo();
                Debug.Log("[DouyinPlatform] 初始化成功");
            }
            return _isInitialized;
        }
        catch (Exception e)
        {
            Debug.LogError($"[DouyinPlatform] 初始化失败: {e.Message}");
            return false;
        }
        #else
        await UniTask.Delay(100);
        _isInitialized = true;
        _cachedSystemInfo = CreateMockSystemInfo();
        return true;
        #endif
    }
    
    public PlatformType GetPlatformType()
    {
        return PlatformType.Douyin;
    }
    
    public async UniTask<LoginResult> LoginAsync()
    {
        Debug.Log("[DouyinPlatform] 开始登录");
        
        #if UNITY_WEBGL && !UNITY_EDITOR
        // TODO: 实现抖音登录逻辑
        await UniTask.Delay(500);
        return new LoginResult { Success = true, UserId = "douyin_user" };
        #else
        await UniTask.Delay(500);
        return new LoginResult { Success = true, UserId = "douyin_test_user" };
        #endif
    }
    
    public async UniTask<bool> ShareAsync(ShareData shareData)
    {
        Debug.Log($"[DouyinPlatform] 分享: {shareData.Title}");
        
        #if UNITY_WEBGL && !UNITY_EDITOR
        TT_ShareAppMessage(shareData.Title, shareData.ImageUrl);
        #endif
        
        await UniTask.Delay(300);
        return true;
    }
    
    public async UniTask<AdResult> ShowAdAsync(AdType adType)
    {
        Debug.Log($"[DouyinPlatform] 显示广告: {adType}");
        
        #if UNITY_WEBGL && !UNITY_EDITOR
        // TODO: 实现抖音广告逻辑
        #endif
        
        await UniTask.Delay(1000);
        return new AdResult { Success = true, Completed = true };
    }
    
    public async UniTask<bool> SaveDataAsync(string key, string value)
    {
        #if UNITY_WEBGL && !UNITY_EDITOR
        TT_SetStorageSync(key, value);
        #endif
        await UniTask.Yield();
        return true;
    }
    
    public async UniTask<string> LoadDataAsync(string key)
    {
        #if UNITY_WEBGL && !UNITY_EDITOR
        string value = TT_GetStorageSync(key);
        await UniTask.Yield();
        return value;
        #else
        await UniTask.Yield();
        return null;
        #endif
    }
    
    public async UniTask<string> DownloadFileAsync(string url, string localPath, Action<float> onProgress = null)
    {
        Debug.Log($"[DouyinPlatform] 下载文件: {url}");
        await UniTask.Delay(500);
        return localPath;
    }
    
    public SystemInfo GetSystemInfo()
    {
        if (_cachedSystemInfo != null)
            return _cachedSystemInfo;
        
        #if UNITY_WEBGL && !UNITY_EDITOR
        try
        {
            string jsonInfo = TT_GetSystemInfo();
            _cachedSystemInfo = JsonUtility.FromJson<SystemInfo>(jsonInfo);
            return _cachedSystemInfo;
        }
        catch (Exception e)
        {
            Debug.LogError($"[DouyinPlatform] 获取系统信息失败: {e.Message}");
            return CreateMockSystemInfo();
        }
        #else
        return CreateMockSystemInfo();
        #endif
    }
    
    public void Vibrate(VibrationType vibrationType)
    {
        #if UNITY_WEBGL && !UNITY_EDITOR
        switch (vibrationType)
        {
            case VibrationType.Light:
            case VibrationType.Medium:
                TT_VibrateShort();
                break;
            case VibrationType.Heavy:
                TT_VibrateLong();
                break;
        }
        #endif
    }
    
    private SystemInfo CreateMockSystemInfo()
    {
        return new SystemInfo
        {
            DeviceModel = UnityEngine.SystemInfo.deviceModel,
            PlatformVersion = "Douyin 1.0.0",
            ScreenWidth = Screen.width,
            ScreenHeight = Screen.height,
            SafeArea = SafeAreaData.FromRect(Screen.safeArea),
            PixelRatio = Screen.dpi / 160f
        };
    }
}