/**
 * Export Record Service Module
 *
 * Provides methods for export record operations:
 * - listExportRecords: List export records with pagination
 * - downloadExportRecord: Download an exported file
 * - deleteExportRecord: Delete an export record
 * - getAdminStorage: Get storage usage info (admin only)
 *
 * All methods use the configured API client and provide error normalization.
 *
 * @module services/exportRecordService
 */

import apiClient, { getErrorMessage } from './api';
import type { ApiResponse } from '../types/api';
import type {
  ListExportRecordsResponse,
  ExportRecordListFilters,
  StorageInfo,
} from '../types/export';
import { downloadBlob, getFileNameFromContentDisposition } from '../utils/download';

/**
 * List export records with pagination
 *
 * @param filters - Filters for listing export records (userId is required)
 * @returns List of export records and pagination information
 * @throws {Error} When the API request fails
 */
export const listExportRecords = async (
  filters: ExportRecordListFilters
): Promise<ListExportRecordsResponse> => {
  try {
    // Build query parameters
    const params: Record<string, string | number> = {
      userId: filters.userId,
      page: filters.page || 1,
      pageSize: filters.pageSize || 20,
      sortOrder: filters.sortOrder || 'desc',
    };

    const response = await apiClient.get<ApiResponse<ListExportRecordsResponse>>(
      '/api/v1/export/records',
      { params }
    );

    const data = response.data.data;
    
    // Fix any incorrect base URLs in download URLs
    const correctBaseURL = import.meta.env.VITE_API_BASE_URL;
    if (correctBaseURL && data.records) {
      data.records = data.records.map(record => {
        if (record.downloadUrl && record.downloadUrl.startsWith('http')) {
          try {
            const urlObj = new URL(record.downloadUrl);
            const correctUrlObj = new URL(correctBaseURL);
            if (urlObj.origin !== correctUrlObj.origin) {
              return {
                ...record,
                downloadUrl: record.downloadUrl.replace(urlObj.origin, correctUrlObj.origin)
              };
            }
          } catch {
            // Invalid URL, skip
          }
        }
        return record;
      });
    }

    return data;
  } catch (error) {
    const message = getErrorMessage(error);
    throw new Error(`获取导出记录列表失败: ${message}`, { cause: error });
  }
};

/**
 * Download an exported file
 *
 * Opens the file in a new tab/window for download.
 * The backend returns a FileResponse with appropriate headers.
 *
 * @param recordId - The export record ID
 * @param userId - The user ID who owns the record
 * @throws {Error} When the download fails
 */
export const downloadExportRecord = async (
  recordId: string,
  userId: string
): Promise<void> => {
  try {
    // Use apiClient to download the file (goes through axios with proper config)
    // This avoids mixed content warnings by using relative URLs
    const response = await apiClient.get(
      `/api/v1/export/records/${recordId}/download`,
      {
        params: { userId },
        responseType: 'blob', // Important: tell axios to expect binary data
      }
    );
    
    // Get filename from Content-Disposition header
    const fileName = getFileNameFromContentDisposition(
      response.headers['content-disposition'],
      `export-${recordId}.doc`
    );
    
    // Create blob and download
    const blob = new Blob([response.data], { type: 'application/msword' });
    downloadBlob(blob, fileName);
  } catch (error) {
    const message = getErrorMessage(error);
    throw new Error(`下载文件失败: ${message}`, { cause: error });
  }
};

/**
 * Delete an export record
 *
 * Deletes the export record and its associated file from storage.
 *
 * @param recordId - The export record ID to delete
 * @param userId - The user ID who owns the record
 * @returns Promise that resolves when deletion is successful
 * @throws {Error} When the API request fails or record not found
 */
export const deleteExportRecord = async (
  recordId: string,
  userId: string
): Promise<void> => {
  try {
    await apiClient.delete<ApiResponse<void>>(
      `/api/v1/export/records/${recordId}`,
      {
        params: { userId },
      }
    );
  } catch (error) {
    const message = getErrorMessage(error);
    throw new Error(`删除导出记录失败: ${message}`, { cause: error });
  }
};

/**
 * Get storage usage information (admin only)
 *
 * Retrieves detailed storage usage statistics including:
 * - Total and used disk space
 * - Per-user storage usage
 * - Quota information
 *
 * @returns Storage usage information
 * @throws {Error} When the API request fails or user is not authorized
 */
export const getAdminStorage = async (): Promise<StorageInfo> => {
  try {
    const response = await apiClient.get<ApiResponse<StorageInfo>>(
      '/api/v1/admin/storage'
    );

    return response.data.data;
  } catch (error) {
    const message = getErrorMessage(error);
    throw new Error(`获取存储信息失败: ${message}`, { cause: error });
  }
};

/**
 * Export record service object (alternative export pattern)
 * Groups all export record operations into a single namespace
 */
export const exportRecordService = {
  list: listExportRecords,
  download: downloadExportRecord,
  delete: deleteExportRecord,
  getStorage: getAdminStorage,
};

export default exportRecordService;