/**
 * 七牛云上传工具
 */

const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const https = require('https');
const http = require('http');

class QiniuUploader {
  constructor() {
    this.configPath = process.env.QINIU_CONFIG_PATH || 
                      path.join(process.cwd(), 'config', 'qiniu-config.json');
    this.config = this.loadConfig();
  }

  // 加载配置
  loadConfig() {
    if (!fs.existsSync(this.configPath)) {
      // 创建默认配置
      const defaultConfig = {
        buckets: {
          default: {
            accessKey: process.env.QINIU_ACCESS_KEY || 'YOUR_ACCESS_KEY',
            secretKey: process.env.QINIU_SECRET_KEY || 'YOUR_SECRET_KEY',
            bucket: process.env.QINIU_BUCKET || 'your-bucket',
            region: process.env.QINIU_REGION || 'z0',
            domain: process.env.QINIU_DOMAIN || 'https://your-cdn.com'
          }
        }
      };

      const dir = path.dirname(this.configPath);
      if (!fs.existsSync(dir)) {
        fs.mkdirSync(dir, { recursive: true });
      }
      fs.writeFileSync(this.configPath, JSON.stringify(defaultConfig, null, 2));
      
      return defaultConfig;
    }

    return JSON.parse(fs.readFileSync(this.configPath, 'utf-8'));
  }

  // 列出配置
  async listConfig() {
    const config = this.loadConfig();
    const buckets = {};

    for (const [name, bucket] of Object.entries(config.buckets)) {
      buckets[name] = {
        accessKey: this.maskKey(bucket.accessKey),
        secretKey: this.maskKey(bucket.secretKey),
        bucket: bucket.bucket,
        region: bucket.region,
        domain: bucket.domain
      };
    }

    return { buckets };
  }

  // 设置配置值
  async setConfigValue(keyPath, value) {
    const config = this.loadConfig();
    const keys = keyPath.split('.');
    let current = config;

    for (let i = 0; i < keys.length - 1; i++) {
      if (!current[keys[i]]) {
        current[keys[i]] = {};
      }
      current = current[keys[i]];
    }

    const lastKey = keys[keys.length - 1];
    
    // 清理 URL 中的 Markdown 格式（防止用户从卡片复制时带入）
    if (typeof value === 'string' && (value.includes('http://') || value.includes('https://'))) {
      // 移除 Markdown 链接格式：[text](url) → url
      const markdownLinkRegex = /\[([^\]]+)\]\(([^)]+)\)/;
      const match = value.match(markdownLinkRegex);
      if (match) {
        value = match[2]; // 提取 URL 部分
      }
      // 移除末尾的斜杠
      if (value.endsWith('/')) {
        value = value.slice(0, -1);
      }
    }
    
    // 类型转换
    if (value === 'true') value = true;
    else if (value === 'false') value = false;
    else if (!isNaN(value) && !value.includes('.')) value = Number(value);

    current[lastKey] = value;

    fs.writeFileSync(this.configPath, JSON.stringify(config, null, 2));
    this.config = config;
  }

  // 上传文件
  async upload(localFile, key, bucketName = 'default') {
    const bucketConfig = this.config.buckets[bucketName];
    
    if (!bucketConfig) {
      throw new Error(`存储桶 "${bucketName}" 不存在`);
    }

    const { accessKey, secretKey, bucket, region, domain } = bucketConfig;

    // 生成上传凭证
    const uploadToken = this.generateUploadToken(accessKey, secretKey, bucket, key);

    // 获取上传端点
    const uploadEndpoint = this.getUploadEndpoint(region);

    // 读取文件
    const fileContent = fs.readFileSync(localFile);
    const fileName = path.basename(localFile);

    // 构建 multipart/form-data
    const boundary = '----WebKitFormBoundary' + Math.random().toString(36).substring(2);
    
    const bodyParts = [
      `------${boundary}`,
      'Content-Disposition: form-data; name="token"',
      '',
      uploadToken,
      `------${boundary}`,
      'Content-Disposition: form-data; name="key"',
      '',
      key,
      `------${boundary}`,
      `Content-Disposition: form-data; name="file"; filename="${fileName}"`,
      'Content-Type: application/octet-stream',
      '',
      ''
    ];

    const bodyBuffer = Buffer.concat([
      Buffer.from(bodyParts.join('\r\n'), 'utf-8'),
      fileContent,
      Buffer.from(`\r\n------${boundary}--\r\n`, 'utf-8')
    ]);

    // 上传
    const result = await this.httpRequest(`${uploadEndpoint}/`, {
      method: 'POST',
      headers: {
        'Content-Type': `multipart/form-data; boundary=----${boundary}`,
        'Content-Length': bodyBuffer.length
      }
    }, bodyBuffer);

    if (result.status !== 200) {
      throw new Error(`上传失败：${JSON.stringify(result.data)}`);
    }

    return {
      key: result.data.key,
      hash: result.data.hash,
      url: `${domain}/${key}`
    };
  }

  // 刷新 CDN
  async refreshCDN(bucketName, key, logCallback) {
    const bucketConfig = this.config.buckets[bucketName];
    if (!bucketConfig) {
      if (logCallback) logCallback(`[CDN 刷新] 存储桶 "${bucketName}" 配置不存在`);
      return;
    }

    const { accessKey, secretKey, domain } = bucketConfig;
    
    // 检查密钥是否有效
    if (!accessKey || !secretKey || accessKey === 'YOUR_ACCESS_KEY' || secretKey === 'YOUR_SECRET_KEY') {
      if (logCallback) logCallback(`[CDN 刷新] 警告：存储桶 "${bucketName}" 的密钥未配置，跳过 CDN 刷新`);
      return;
    }

    const fileUrl = `${domain}/${key}`;
    if (logCallback) logCallback(`[CDN 刷新] 请求刷新 URL: ${fileUrl}`);

    const body = JSON.stringify({ urls: [fileUrl] });
    const accessToken = this.generateAccessToken(accessKey, secretKey, 'POST', '/v2/tune/refresh', body);

    try {
      const result = await this.httpRequest('https://fusion.qiniuapi.com/v2/tune/refresh', {
        method: 'POST',
        headers: {
          'Host': 'fusion.qiniuapi.com',
          'Content-Type': 'application/json',
          'Content-Length': body.length,
          'Authorization': accessToken
        }
      }, body);

      if (logCallback) logCallback(`[CDN 刷新] 响应状态：${result.status}, 数据：${JSON.stringify(result.data)}`);

      if (result.status !== 200) {
        throw new Error(`CDN 刷新失败：${JSON.stringify(result.data)}`);
      }

      if (logCallback) logCallback(`[CDN 刷新] ✅ 刷新成功`);

      return result.data;
    } catch (error) {
      if (logCallback) logCallback(`[CDN 刷新] ❌ 错误：${error.message}`);
      throw error;
    }
  }

  // 生成上传凭证
  generateUploadToken(accessKey, secretKey, bucket, key) {
    const deadline = Math.floor(Date.now() / 1000) + 3600;
    const scope = key ? `${bucket}:${key}` : bucket;

    const putPolicy = {
      scope: scope,
      deadline: deadline
    };

    const encodedPolicy = this.urlSafeBase64(JSON.stringify(putPolicy));
    const encodedSignature = this.urlSafeBase64(this.hmacSha1(encodedPolicy, secretKey));

    return `${accessKey}:${encodedSignature}:${encodedPolicy}`;
  }

  // 生成 CDN 刷新令牌
  generateAccessToken(accessKey, secretKey, method, path, body) {
    const signData = `${method} ${path}\nHost: fusion.qiniuapi.com\nContent-Type: application/json\n\n${body}`;
    const signature = this.hmacSha1(signData, secretKey);
    const encodedSign = this.urlSafeBase64(signature);
    return `Qiniu ${accessKey}:${encodedSign}`;
  }

  // 获取上传端点
  getUploadEndpoint(region) {
    const endpoints = {
      'z0': 'https://up.qiniup.com',
      'z1': 'https://up-z1.qiniup.com',
      'z2': 'https://up-z2.qiniup.com',
      'na0': 'https://up-na0.qiniup.com',
      'as0': 'https://up-as0.qiniup.com'
    };
    return endpoints[region] || endpoints['z0'];
  }

  // 工具函数
  hmacSha1(data, secret) {
    return crypto.createHmac('sha1', secret).update(data).digest();
  }

  urlSafeBase64(data) {
    return Buffer.from(data).toString('base64')
      .replace(/\+/g, '-')
      .replace(/\//g, '_');
  }

  maskKey(key) {
    if (!key || key.length < 8) return '***';
    return key.substring(0, 4) + '...' + key.substring(key.length - 4);
  }

  httpRequest(url, options, body = null) {
    return new Promise((resolve, reject) => {
      const protocol = url.startsWith('https') ? https : http;
      
      const req = protocol.request(url, options, (res) => {
        let data = '';
        res.on('data', chunk => data += chunk);
        res.on('end', () => {
          try {
            const json = JSON.parse(data);
            resolve({ status: res.statusCode, data: json });
          } catch (e) {
            resolve({ status: res.statusCode, data: data });
          }
        });
      });
      
      req.on('error', reject);
      if (body) req.write(body);
      req.end();
    });
  }
}

module.exports = { QiniuUploader };