// 检查相册权限
const checkAlbumPermission = () => {
  return new Promise((resolve, reject) => {
    // #ifdef MP-WEIXIN
    // 微信小程序权限检查
    uni.getSetting({
      success(res) {
        if (res.authSetting['scope.writePhotosAlbum'] === undefined) {
          // 从未询问过
          requestAlbumPermission().then(resolve).catch(reject);
        } else if (res.authSetting['scope.writePhotosAlbum'] === false) {
          // 已拒绝，需要引导用户打开
          resolve(false);
        } else {
          resolve(true);
        }
      },
      fail: reject
    });
    // #endif
    
    // #ifdef MP-KUAISHOU
    // 快手小程序权限检查
    uni.getSetting({
      success(res) {
        if (res.authSetting['scope.album'] === undefined) {
          requestAlbumPermission().then(resolve).catch(reject);
        } else if (res.authSetting['scope.album'] === false) {
          resolve(false);
        } else {
          resolve(true);
        }
      },
      fail: reject
    });
    // #endif
    
    // 其他平台
    // #ifndef MP-WEIXIN || MP-KUAISHOU
    resolve(true);
    // #endif
  });
};

// 请求相册权限
const requestAlbumPermission = () => {
  return new Promise((resolve, reject) => {
    // #ifdef MP-WEIXIN
    uni.authorize({
      scope: 'scope.writePhotosAlbum',
      success: () => resolve(true),
      fail: () => resolve(false)
    });
    // #endif
    
    // #ifdef MP-KUAISHOU
    uni.authorize({
      scope: 'scope.album',
      success: () => resolve(true),
      fail: () => resolve(false)
    });
    // #endif
    
    // 其他平台
    // #ifndef MP-WEIXIN || MP-KUAISHOU
    resolve(true);
    // #endif
  });
};

// 打开系统设置
const openSettings = () => {
  return new Promise((resolve) => {
    uni.showModal({
      title: '提示',
      content: '需要您授权访问相册才能保存视频，是否前往设置?',
      success(res) {
        if (res.confirm) {
          uni.openSetting({
            success: () => resolve(true),
            fail: () => resolve(false)
          });
        } else {
          resolve(false);
        }
      }
    });
  });
};

// 保存视频到相册
export const saveVideoToAlbum = (filePath) => {
  return new Promise(async (resolve, reject) => {
    try {
      // 1. 检查权限
      const hasPermission = await checkAlbumPermission();
      
      if (!hasPermission) {
        // 尝试打开设置
        const settingsResult = await openSettings();
        if (!settingsResult) {
          return reject(new Error('相册权限被拒绝'));
        }
        
        // 再次检查权限
        const newPermission = await checkAlbumPermission();
        if (!newPermission) {
          return reject(new Error('相册权限被拒绝'));
        }
      }
      
      // 2. 保存文件
      // #ifdef MP-WEIXIN
      uni.saveVideoToPhotosAlbum({
        filePath,
        success: resolve,
        fail: reject
      });
      // #endif
      
      // #ifdef MP-KUAISHOU
      uni.saveMediaToAlbum({
        filePath,
        mediaType: 'video',
        success: resolve,
        fail: reject
      });
      // #endif
      
      // #ifndef MP-WEIXIN || MP-KUAISHOU
      uni.showToast({
        title: '当前平台暂不支持保存到相册',
        icon: 'none'
      });
      reject(new Error('Unsupported platform'));
      // #endif
    } catch (error) {
      reject(error);
    }
  });
};

// 下载并保存视频
export const downloadAndSaveVideo = async (url) => {
  try {
    uni.showLoading({ title: '下载中...', mask: true });
    
    // 1. 下载文件
    const downloadRes = await uni.$http.download(url);
    
    // 2. 保存到相册
    await saveVideoToAlbum(downloadRes.tempFilePath);
    
    uni.showToast({ title: '已成功保存到相册' });
    return true;
  } catch (error) {
    console.error('下载保存失败:', error);
    uni.showToast({
      title: `保存失败: ${error.message || '未知错误'}`,
      icon: 'none'
    });
    return false;
  } finally {
    uni.hideLoading();
  }
};

// 获取图片选择权限
export const getImagePermission = () => {
  return new Promise((resolve, reject) => {
    // #ifdef MP-WEIXIN
    uni.chooseImage({
      count: 1,
      success: resolve,
      fail: reject
    });
    // #endif
    
    // #ifdef MP-KUAISHOU
    uni.chooseImage({
      count: 1,
      success: resolve,
      fail: reject
    });
    // #endif
    
    // #ifndef MP-WEIXIN || MP-KUAISHOU
    reject(new Error('Unsupported platform'));
    // #endif
  });
};