/**
 * 下载错误代码和消息定义
 * 统一管理所有下载相关的错误提示
 */

export enum DownloadErrorCode {
  // 权限相关
  UNAUTHORIZED = 'UNAUTHORIZED',
  FORBIDDEN = 'FORBIDDEN',
  NO_PERMISSION = 'NO_PERMISSION',
  VIDEO_WAIT_PERIOD = 'VIDEO_WAIT_PERIOD',
  
  // 文件不存在
  MATERIAL_NOT_FOUND = 'MATERIAL_NOT_FOUND',
  FILE_NOT_FOUND = 'FILE_NOT_FOUND',
  FILE_MISSING = 'FILE_MISSING', // 新增：源文件缺失（明确标识）
  PSD_NOT_FOUND = 'PSD_NOT_FOUND',
  NO_DOWNLOADABLE_FILES = 'NO_DOWNLOADABLE_FILES',
  
  // 网络/存储
  S3_ACCESS_FAILED = 'S3_ACCESS_FAILED',
  NETWORK_ERROR = 'NETWORK_ERROR',
  FILE_READ_ERROR = 'FILE_READ_ERROR',
  
  // 数据错误
  INVALID_DOWNLOAD_TYPE = 'INVALID_DOWNLOAD_TYPE',
  ASSET_TYPE_MISMATCH = 'ASSET_TYPE_MISMATCH',
  BIGINT_SERIALIZATION_ERROR = 'BIGINT_SERIALIZATION_ERROR',
  
  // 处理错误
  ZIP_CREATION_FAILED = 'ZIP_CREATION_FAILED',
  STREAM_ERROR = 'STREAM_ERROR',
  UNKNOWN_ERROR = 'UNKNOWN_ERROR',
}

/**
 * 错误消息映射（中文）
 */
export const DownloadErrorMessages: Record<DownloadErrorCode, string> = {
  [DownloadErrorCode.UNAUTHORIZED]: '请先登录',
  [DownloadErrorCode.FORBIDDEN]: '您的下载权限已被限制，请联系管理员',
  [DownloadErrorCode.NO_PERMISSION]: '无权限下载该素材',
  [DownloadErrorCode.VIDEO_WAIT_PERIOD]: '视频类素材上传后满 15 天才能下载',
  
  [DownloadErrorCode.MATERIAL_NOT_FOUND]: '素材不存在',
  [DownloadErrorCode.FILE_NOT_FOUND]: '源文件已丢失（可能被清空），可尝试下载预览图',
  [DownloadErrorCode.FILE_MISSING]: '没有源文件，可联系作者重新上传',
  [DownloadErrorCode.PSD_NOT_FOUND]: 'PSD 文件不存在',
  [DownloadErrorCode.NO_DOWNLOADABLE_FILES]: '没有可下载的文件',
  
  [DownloadErrorCode.S3_ACCESS_FAILED]: '存储服务访问失败，请稍后重试',
  [DownloadErrorCode.NETWORK_ERROR]: '网络连接失败，请检查网络后重试',
  [DownloadErrorCode.FILE_READ_ERROR]: '文件读取失败，请稍后重试',
  
  [DownloadErrorCode.INVALID_DOWNLOAD_TYPE]: '无效的下载类型',
  [DownloadErrorCode.ASSET_TYPE_MISMATCH]: '文件类型不匹配，请联系管理员',
  [DownloadErrorCode.BIGINT_SERIALIZATION_ERROR]: '数据处理错误，请稍后重试',
  
  [DownloadErrorCode.ZIP_CREATION_FAILED]: '文件打包失败，请稍后重试',
  [DownloadErrorCode.STREAM_ERROR]: '文件流读取失败，请稍后重试',
  [DownloadErrorCode.UNKNOWN_ERROR]: '下载失败，请稍后重试',
};

/**
 * 下载错误响应接口
 */
export interface DownloadErrorResponse {
  error: string;
  code?: DownloadErrorCode;
  details?: string;
}

/**
 * 创建标准化的错误响应
 */
export function createDownloadError(
  code: DownloadErrorCode,
  details?: string
): DownloadErrorResponse {
  return {
    error: DownloadErrorMessages[code],
    code,
    ...(details && { details }),
  };
}

/**
 * 根据错误代码获取用户友好的错误消息
 */
export function getDownloadErrorMessage(code?: DownloadErrorCode | string): string {
  if (!code) {
    return DownloadErrorMessages[DownloadErrorCode.UNKNOWN_ERROR];
  }
  
  // 如果是字符串，尝试转换为枚举
  const errorCode = Object.values(DownloadErrorCode).includes(code as DownloadErrorCode)
    ? (code as DownloadErrorCode)
    : DownloadErrorCode.UNKNOWN_ERROR;
  
  return DownloadErrorMessages[errorCode as DownloadErrorCode] || DownloadErrorMessages[DownloadErrorCode.UNKNOWN_ERROR];
}

/**
 * 从错误对象中提取错误代码和消息
 */
export function parseDownloadError(error: any): {
  code: DownloadErrorCode;
  message: string;
  details?: string;
} {
  // 如果已经是标准化的错误响应
  if (error?.code && Object.values(DownloadErrorCode).includes(error.code as DownloadErrorCode)) {
    const code = error.code as DownloadErrorCode;
    return {
      code,
      message:
        code === DownloadErrorCode.VIDEO_WAIT_PERIOD
          ? error.details || error.error || DownloadErrorMessages[code]
          : error.error || DownloadErrorMessages[code],
      details: error.details,
    };
  }
  
  // 如果是字符串错误消息，尝试匹配错误代码
  const errorMessage = error?.error || error?.message || String(error);
  
  // 根据错误消息内容推断错误类型
  // 优先检查更具体的错误类型
  if (errorMessage.includes('没有源文件') || errorMessage.includes('源文件缺失') || errorMessage.includes('联系作者')) {
    return { code: DownloadErrorCode.FILE_MISSING, message: DownloadErrorMessages[DownloadErrorCode.FILE_MISSING] };
  }
  if (errorMessage.includes('未登录') || errorMessage.includes('请先登录')) {
    return { code: DownloadErrorCode.UNAUTHORIZED, message: DownloadErrorMessages[DownloadErrorCode.UNAUTHORIZED] };
  }
  if (errorMessage.includes('权限') || errorMessage.includes('无权限')) {
    return { code: DownloadErrorCode.NO_PERMISSION, message: DownloadErrorMessages[DownloadErrorCode.NO_PERMISSION] };
  }
  if (errorMessage.includes('满 15 天') || errorMessage.includes('上传后')) {
    return { code: DownloadErrorCode.VIDEO_WAIT_PERIOD, message: DownloadErrorMessages[DownloadErrorCode.VIDEO_WAIT_PERIOD], details: error?.details };
  }
  if (errorMessage.includes('不存在') || errorMessage.includes('not found')) {
    return { code: DownloadErrorCode.FILE_NOT_FOUND, message: DownloadErrorMessages[DownloadErrorCode.FILE_NOT_FOUND] };
  }
  if (errorMessage.includes('S3') || errorMessage.includes('存储')) {
    return { code: DownloadErrorCode.S3_ACCESS_FAILED, message: DownloadErrorMessages[DownloadErrorCode.S3_ACCESS_FAILED] };
  }
  if (errorMessage.includes('网络') || errorMessage.includes('network')) {
    return { code: DownloadErrorCode.NETWORK_ERROR, message: DownloadErrorMessages[DownloadErrorCode.NETWORK_ERROR] };
  }
  if (errorMessage.includes('BigInt')) {
    return { code: DownloadErrorCode.BIGINT_SERIALIZATION_ERROR, message: DownloadErrorMessages[DownloadErrorCode.BIGINT_SERIALIZATION_ERROR] };
  }
  
  // 默认未知错误
  return {
    code: DownloadErrorCode.UNKNOWN_ERROR,
    message: errorMessage || DownloadErrorMessages[DownloadErrorCode.UNKNOWN_ERROR],
  };
}