const express = require('express');
const crypto = require('crypto');
const axios = require('axios');
const cors = require('cors');
const app = express();

app.use((req, res, next) => {
  console.log(`Request from: ${req.ip}, params: ${JSON.stringify(req.query)}`);
  next();
});
app.use(cors());

app.use(express.static('public'));



app.get('/search', async (req, res) => {
  const { name } = req.query;

  const input = `16566580507931f7c79f67099ddad3a4f0e4ed29a6name${name}page1`;

  const sign = crypto.createHash('md5').update(input).digest('hex').toUpperCase();

  const url = 'https://app.blued.cn/home/web-recharge/getUserInfoByNickname';

  const params = {
    name,
    page: 1,
    sign
  };

  try {
    const response = await axios.get(url, { params });
    res.send(processResponse(response.data));
  } catch (error) {
    console.error(error);
    res.status(500).send('Error getting data from Blued');
  }
});

app.get('/viewPhone', async (req, res) => {
  const { id } = req.query;

  const url = 'https://app.blued.cn/msg/phone/list';

  const headers = {
    'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Mobile/15E148 Safari/604.1',
    'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
    'Accept-Encoding': 'gzip, deflate, br',
    'Connection': 'keep-alive',
    'Cookie': 'uid=' + id
  };

  try {
    const response = await axios({
      url,
      headers
    });
    res.send((response.data));
  } catch (error) {
    console.error(error);
    res.status(500).send('Error getting data from Blued');
  }
});


// 新增路由：代理用户主页
app.get('/getDetail', async (req, res) => {
  const { id } = req.query;

  if (!id) {
    return res.status(400).send('Missing id parameter');
  }

  const targetUrl = `https://app.blued.cn/user`;
  const params = { id };

  // 模拟真实浏览器请求头（关键！）
  const headers = {
    'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Mobile/15E148 Safari/604.1',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
    'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
    'Accept-Encoding': 'gzip, deflate, br',
    'Connection': 'keep-alive',
    'Upgrade-Insecure-Requests': '1',
    'Sec-Fetch-Dest': 'document',
    'Sec-Fetch-Mode': 'navigate',
    'Sec-Fetch-Site': 'none',
    'Sec-Fetch-User': '?1',
  };

  try {
    const response = await axios({
      method: 'GET',
      url: targetUrl,
      params: params,
      headers: headers,
      responseType: 'text', // 确保返回文本
      timeout: 10000,
      // 如果 Blued 使用 gzip，axios 会自动解压
    });

    // 设置正确的内容类型
    res.set('Content-Type', 'text/html; charset=utf-8');
    // 可选：移除或修改 CSP/X-Frame-Options（但通常在 HTML meta 或响应头中）
    // 注意：响应头由 Blued 控制，我们只能改 HTML 内容

    // （可选）尝试移除 HTML 中的 X-Frame-Options meta（如果存在）
    let html = response.data;
    // 移除可能的 <meta http-equiv="X-Frame-Options"> 标签
    html = html.replace(/<meta[^>]*http-equiv=["']?X-Frame-Options["']?[^>]*>/gi, '');
    console.log(extractConfigFromHtml(html))
    // 返回修改后的 HTML
    res.json(extractConfigFromHtml(html));
  } catch (error) {
    console.error('Proxy error:', error.message);
    if (error.response) {
      console.error('Blued responded with status:', error.response.status);
    }
    res.status(500).send('Failed to fetch user page');
  }
});





function extractConfigFromHtml(htmlString) {
  // 匹配 window.CONFIG = { ... };
  const match = htmlString.match(/window\.CONFIG\s*=\s*(\{[\s\S]*?\});\s*</);
  if (match) {
    try {
      // 安全地解析 JSON（注意：这里其实是 JS 对象字面量，不是标准 JSON）
      // 但由于 Blued 的 CONFIG 是合法 JS 对象，且无函数，可用 eval（谨慎！）或更安全方式
      // 推荐：先替换掉末尾分号，再用 Function 构造器（比 eval 稍安全）
      const configStr = match[1];
      // 使用 Function 构造器解析（避免污染作用域）
      const config = new Function(`return (${configStr})`)();
      return config;
    } catch (e) {
      console.error('解析 CONFIG 失败:', e);
      return null;
    }
  }
  return null;
}

// 示例用法（假设你已通过 fetch 或 axios 获取到 html 字符串）
// const html = await response.text();
// const config = extractConfigFromHtml(html);

function processResponse(response) {
  // 检查结构是否合法
  if (!response || !response.data || !Array.isArray(response.data.list)) {
    return response; // 结构不符合，直接返回原数据
  }

  // 深拷贝并处理 list 中的每个对象
  const processedList = response.data.list.map(item => {
    if (item && typeof item === 'object' && item.hasOwnProperty('uid')) {
      return {
        ...item,
        uuid: decrypt(item.uid)
      };
    }
    // 如果没有 uid，保留原对象
    return { ...item };
  });

  // 返回新结构
  return {
    ...response,
    data: {
      ...response.data,
      list: processedList
    }
  };
}


class Hashids {
  constructor(salt = '', minLength = 0, alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123567890') {
    this.salt = salt + '';
    this.minLength = Math.max(0, parseInt(minLength, 10) || 0);
    this.alphabet = '';
    // deduplicate alphabet chars (preserve order)
    for (let ch of alphabet) if (!this.alphabet.includes(ch)) this.alphabet += ch;
    if (this.alphabet.length < 16) throw new Error('alphabet must contain at least 16 unique characters');
    if (this.alphabet.includes(' ')) throw new Error('alphabet cannot contains spaces');

    this.seps = 'cfhistuCFHISTU';
    // remove seps from alphabet (mirror Java logic)
    let a = this.alphabet;
    for (let i = 0; i < this.seps.length; i++) {
      const idx = a.indexOf(this.seps.charAt(i));
      if (idx === -1) {
        // if not found, replace that position in seps with space (same effect as Java)
        this.seps = this.seps.substring(0, i) + ' ' + this.seps.substring(i + 1);
      } else {
        a = a.substring(0, idx) + ' ' + a.substring(idx + 1);
      }
    }
    a = a.replace(/\s+/g, '');
    this.seps = this.seps.replace(/\s+/g, '');

    // m21293b(strReplaceAll, this.f22838a);
    let shuffledSeps = this._consistentShuffle(this.seps, this.salt);
    this.seps = shuffledSeps;

    // adjust seps/alphabet according to Java logic
    if (!this.seps || (a.length / this.seps.length) > 3.5) {
      let ceil = Math.ceil(a.length / 3.5);
      if (ceil === 1) ceil = ceil + 1;
      if (ceil > this.seps.length) {
        const diff = ceil - this.seps.length;
        this.seps += a.substring(0, diff);
        a = a.substring(diff);
      } else {
        this.seps = this.seps.substring(0, ceil);
      }
    }

    // now shuffle alphabet with salt
    a = this._consistentShuffle(a, this.salt);

    const guardCount = Math.ceil(a.length / 12);
    if (a.length < 3) {
      this.guards = this.seps.substring(0, guardCount);
      this.seps = this.seps.substring(guardCount);
    } else {
      this.guards = a.substring(0, guardCount);
      a = a.substring(guardCount);
    }

    this.alphabet = a;
  }

  // consistent shuffle m21293b
  _consistentShuffle(alphabet, salt) {
    if (!salt || salt.length === 0) return alphabet;
    const arr = alphabet.split('');
    const saltChars = salt.split('').map(c => c.charCodeAt(0));
    let i = arr.length - 1;
    let v = 0;
    let p = 0;
    while (i > 0) {
      const idx = v % saltChars.length;
      const c = saltChars[idx];
      p += c;
      const j = (c + idx + p) % i;
      // swap arr[j] and arr[i]
      const tmp = arr[j]; arr[j] = arr[i]; arr[i] = tmp;
      i--;
      v = idx + 1;
    }
    return arr.join('');
  }

  // encode numbers -> hash (m21296a -> m21294b)
  encode(...numbers) {
    if (!numbers || numbers.length === 0) return '';
    // check max like Java: > 9007199254740992L
    const MAX_ALLOWED = BigInt('9007199254740992');
    for (let n of numbers) {
      // accept BigInt or Number or numeric string
      let bn = (typeof n === 'bigint') ? n : BigInt(n);
      if (bn > MAX_ALLOWED) throw new Error('number can not be greater than 9007199254740992');
    }
    return this._encode(numbers);
  }

  _encode(nums) {
    // compute i sum
    let iSum = 0;
    for (let idx = 0; idx < nums.length; idx++) {
      const n = BigInt(nums[idx]);
      iSum = Number(iSum + Number(n % BigInt(idx + 100)));
    }
    let alphabet = this.alphabet;
    const lotteryChar = alphabet.charAt(iSum % alphabet.length);
    let ret = lotteryChar;
    for (let i = 0; i < nums.length; i++) {
      const n = BigInt(nums[i]);
      alphabet = this._consistentShuffle(alphabet, (lotteryChar + this.salt + alphabet).substring(0, alphabet.length));
      ret += this._hashNumber(n, alphabet);
      if (i + 1 < nums.length) {
        const guardIndex = Number((n % BigInt(alphabet.charCodeAt(0) + i)) % BigInt(this.seps.length));
        ret += this.seps.charAt(guardIndex);
      }
    }

    // pad with guards/guards logic like Java
    if (ret.length < this.minLength) {
      ret = this.guards.charAt((ret.charCodeAt(0) + iSum) % this.guards.length) + ret;
      if (ret.length < this.minLength) {
        ret = ret + this.guards.charAt((iSum + ret.charCodeAt(2 % ret.length)) % this.guards.length);
      }
    }

    // while still less than minLength, expand by shuffling alphabet etc
    let half = Math.floor(alphabet.length / 2);
    while (ret.length < this.minLength) {
      alphabet = this._consistentShuffle(alphabet, alphabet);
      let str = alphabet.substring(half) + ret + alphabet.substring(0, half);
      const excess = str.length - this.minLength;
      if (excess > 0) {
        const start = Math.floor(excess / 2);
        str = str.substring(start, start + this.minLength);
      }
      ret = str;
    }

    return ret;
  }

  // convert number to string using alphabet (m21291a)
  _hashNumber(number, alphabet) {
    let num = BigInt(number);
    const len = alphabet.length;
    let out = '';
    if (num === 0n) return alphabet.charAt(0);
    while (num > 0n) {
      const idx = Number(num % BigInt(len));
      out = alphabet.charAt(idx) + out;
      num = num / BigInt(len);
    }
    return out;
  }

  // decode hash -> array of numbers (m21297a -> m21292a)
  decode(hash) {
    if (hash === '') return [];
    // remove guards
    const hashSplit = hash.replace(new RegExp('[' + this.guards.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&') + ']', 'g'), ' ').split(' ').filter(Boolean);
    const hashPart = (hashSplit.length === 3 || hashSplit.length === 2) ? hashSplit[1] : hashSplit[0];
    const lottery = hashPart.charAt(0);
    const parts = hashPart.substring(1).replace(new RegExp('[' + this.seps.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&') + ']', 'g'), ' ').split(' ').filter(Boolean);
    const result = [];
    for (let i = 0; i < parts.length; i++) {
      const part = parts[i];
      let alphabet = this._consistentShuffle(this.alphabet, (lottery + this.salt + this.alphabet).substring(0, this.alphabet.length));
      result.push(this._unhash(part, alphabet));
    }

    // verify
    const encoded = this._encode(result);
    // if verification fails, return empty arr
    if (encoded !== hash) return [];
    return result;
  }

  _unhash(input, alphabet) {
    let num = 0n;
    const len = BigInt(alphabet.length);
    for (let i = 0; i < input.length; i++) {
      const pos = BigInt(alphabet.indexOf(input.charAt(i)));
      num = num * len + pos;
    }
    return num;
  }
}

// --- 对外封装的函数（与 Java 中的 HashidEncryptTool 对应） ---
// decrypt: Java m22018a(String str) -> 传入 hash，返回拼接的数字字符串
function decrypt(hashStr) {
  if (!hashStr) return '';
  try {
    const h = new Hashids('1766', 6);
    const arr = h.decode(hashStr);
    // arr contains BigInt values. Concatenate them as decimal strings without separator (same as Java append)
    return arr.map(x => x.toString()).join('');
  } catch (e) {
    console.error(e);
    return '';
  }
}


module.exports = {
  HashidsJS: Hashids,
  decrypt: decrypt
};

app.listen(3000, '0.0.0.0', () => {
  console.log('Server listening on port 80');
});