const express = require('express');
const router = express.Router();
const axios = require('axios');

/**
 * 图片代理
 * GET /api/proxy/image
 */
router.get('/image', async (req, res) => {
  try {
    const { url } = req.query;
    
    if (!url) {
      return res.status(400).json({
        success: false,
        error: 'Image URL is required'
      });
    }

    const response = await axios({
      method: 'GET',
      url: decodeURIComponent(url),
      responseType: 'stream',
      headers: {
        'Referer': 'https://www.pixiv.net/',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
      },
      timeout: 30000
    });

    // 设置响应头
    res.set({
      'Content-Type': response.headers['content-type'],
      'Cache-Control': 'public, max-age=3600', // 缓存1小时
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET',
      'Access-Control-Allow-Headers': 'Content-Type'
    });

    // 流式传输图片数据
    response.data.pipe(res);

  } catch (error) {
    console.error('Image proxy error:', error.message);
    res.status(500).json({
      success: false,
      error: 'Failed to load image'
    });
  }
});

module.exports = router;