// 联络中心Chatbot对接SDK，UMD规范，RSA-OAEP加密
const CHATBOT_PUBLIC_KEY = `-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvtFkJ2RL3LysY0qeRLI2\ncEWM2raPuDNlttUjCnOHpz5Hei9XYW+pf/k1upUB6RwWdZhk5xRN2GgOA9Sb5n6e\nSFv5b72XHveECEpq2YH2oEBaTN55d61hX5B7NJLuGtifDriw5h+OtePPEOetjQut\n4ghHJOqZoGfdZrY6jlbj3B9wJ3pTcupugi0c2wMvbV9dQrpzzzlKs94yMWDHdzNT\nx2jt2WX12R+256yDe4/2vdGFjuxTzm9nR0SLnny2ijPtNMOKRse2kgKiKqEg+c1b\n3KIrRAS5Fk3U71bg/RLgSFChENZsVQNUGsh0Uo/qDw3AgN0b2lvvL8++tpAH265q\nBwIDAQAB\n-----END PUBLIC KEY-----`;

function pemToArrayBuffer(pem) {
  const b64 = pem.replace(/-----.*?-----/g, '').replace(/\s+/g, '');
  const binary = atob(b64);
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < binary.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  return bytes.buffer;
}

async function importPublicKey(pem) {
  const keyBuffer = pemToArrayBuffer(pem);
  console.log(window.crypto);
  return await window.crypto.subtle.importKey(
    'spki',
    keyBuffer,
    {
      name: 'RSA-OAEP',
      hash: 'SHA-1'
    },
    false,
    ['encrypt']
  );
}

async function encryptData(publicKey, data) {
  const encoder = new TextEncoder();
  const encoded = encoder.encode(JSON.stringify(data));
  if (encoded.length > 190) throw new Error('数据超长');
  const encrypted = await window.crypto.subtle.encrypt(
    { name: 'RSA-OAEP' },
    publicKey,
    encoded
  );
  return btoa(String.fromCharCode(...new Uint8Array(encrypted)));
}

async function getIdentity(encryptObj) {
  if (!encryptObj || (!encryptObj.phone && !encryptObj.email && !encryptObj.uuid)) {
    throw new Error('必须提供至少一个敏感信息字段');
  }
  const publicKey = await importPublicKey(CHATBOT_PUBLIC_KEY);
  console.log(`%c【encryptObj】=> ${encryptObj}`, 'color:lawngreen');
  return await encryptData(publicKey, encryptObj);
}

function buildUrl(baseUrl, params) {
  // 完整解析URL结构
  let urlPart = '', hashPart = '', hashQuery = '';

  // 1. 分离基础URL和哈希部分
  if (baseUrl.includes('#')) {
    const [urlBase, ...hashParts] = baseUrl.split('#');
    urlPart = urlBase;
    const hashContent = hashParts.join('#');

    // 2. 检查哈希部分是否包含查询参数
    if (hashContent.includes('?')) {
      const [hashPath, hashQueryPart] = hashContent.split('?');
      hashPart = '#' + hashPath;
      hashQuery = '?' + hashQueryPart;
    } else {
      hashPart = '#' + hashContent;
    }
  } else {
    urlPart = baseUrl;
  }

  let url = urlPart + hashPart + hashQuery

  // 4. 添加参数到URL
  const queryString = new URLSearchParams(params).toString();
  if (queryString) {
    url += (url.includes('?') ? '&' : '?') + queryString;
  }
  return url;
}

class SDK {
  /**
   * 获取带加密identity参数的Chatbot跳转链接
   * @param {string} baseUrl - Chatbot基础URL
   * @param {object} options - 其他参数 { source, lang, encrypt: {phone, email, uuid} }
   * @returns {Promise<string>} 拼接好的URL
   */
  async getUrl(baseUrl, options = {}) {
    const { source, lang = 'zh_CN', encrypt } = options;
    if (!encrypt) throw new Error('encrypt字段必填');
    const identity = await getIdentity(encrypt);
    console.log(`%c【identity】=> ${identity}`, 'color:darkorange');
    const params = { identity, source, lang };
    return buildUrl(baseUrl, params);
  }
}

// UMD导出
(function (root, factory) {
  if (typeof define === 'function' && define.amd) {
    define([], factory);
  } else if (typeof module === 'object' && module.exports) {
    module.exports = factory();
  } else {
    root.sdk = factory();
  }
}(this, function () {
  return new SDK();
}));