/**
 * protocol.js - ChatAIBot.pro 纯 HTTP 协议注册模块
 *
 * 已确认的 API 端点 (Express + Apache/Ubuntu):
 *   POST /api/register         → 201 {"success":true}  (注册, 返回 connect.sid session cookie)
 *   POST /api/register/verify  → 200 (验证, 需要 {email, token})
 *   POST /api/login            → 200 (登录, 需要 {email, password})
 *   POST /api/logout           → 200 OK
 *
 * 注册流程 (逆向自前端 sign-up chunk + module 40933):
 *   1. POST /api/register  { email, password, isAdvertisingAccepted, mainSiteUrl,
 *                             utmSource, utmCampaign, connectBusiness, yandexClientId }
 *      Headers: Content-Type: application/json, Accept-Language: en
 *      → 201 {"success":true} + Set-Cookie: connect.sid
 *   2. 邮件中包含 6 位数字验证码 (token)
 *      格式: "Your code: 528135"
 *   3. POST /api/register/verify  { email, token, connectBusiness, syncToken }
 *      → 验证完成，账号激活
 *   4. POST /api/login  { email, password }
 *      → 获取 session
 */

import { request, get, post, sleep } from './http.js';
import config from './config.js';

const API_BASE = config.siteBase;

// ==================== 工具函数 ====================

function humanDelay(baseMs) {
  return Math.floor(baseMs * (0.8 + Math.random() * 1.7));
}

// ==================== 注册步骤 ====================

/**
 * Step 1: 注册账号
 * POST /api/register
 * 逆向自前端 sign-up-d2a668c82094de73.js + module 40933
 * 浏览器发送的完整字段和 headers
 */
async function stepRegister(account) {
  console.log('  [Step 1] 提交注册...');

  const resp = await post(`${API_BASE}/api/register`, {
    email: account.email,
    password: account.password,
    isAdvertisingAccepted: false,
    mainSiteUrl: `${config.siteBase}/api`,
    utmSource: '',
    utmCampaign: '',
    connectBusiness: '',
    yandexClientId: '',
  }, {
    headers: {
      'Origin': config.siteBase,
      'Referer': config.signupUrl,
      'Accept-Language': 'en',
    },
  });

  const body = resp.text();
  console.log(`    状态: ${resp.status}`);
  console.log(`    响应: ${body.substring(0, 200)}`);

  if (resp.status === 201 || resp.ok) {
    const sessionCookie = resp.cookies.get('connect.sid');
    console.log(`    Session: ${sessionCookie ? sessionCookie.substring(0, 50) + '...' : '无'}`);
    return { success: true, cookies: resp.cookies };
  }

  let errorMsg = body;
  try {
    const json = JSON.parse(body);
    errorMsg = json.message || json.error || body;
  } catch {}

  throw new Error(`注册失败 (${resp.status}): ${errorMsg}`);
}

/**
 * Step 2: 从邮箱获取 6 位验证码
 * chataibot.pro 的验证码就是 token，是一个 6 位数字
 */
async function stepGetVerifyToken(mailProvider, senderFilter) {
  console.log('  [Step 2] 等待验证邮件...');

  const pollOptions = {
    initialDelay: 8000,
    maxAttempts: 15,
    pollInterval: 5000,
  };

  const code = await mailProvider.fetchVerificationCode(senderFilter, pollOptions);
  if (code) {
    console.log(`    验证码: ${code}`);
    return code;
  }

  return null;
}

/**
 * Step 3: 提交验证码
 * POST /api/register/verify  { email, token, connectBusiness, syncToken }
 * 逆向自前端: verify 还发送 connectBusiness 和 syncToken
 */
async function stepVerify(email, token, cookies) {
  console.log('  [Step 3] 提交验证...');

  const resp = await post(`${API_BASE}/api/register/verify`, {
    email,
    token,
    connectBusiness: '',
    syncToken: '',
  }, {
    cookies,
    headers: {
      'Origin': config.siteBase,
      'Referer': `${config.siteBase}/app/verify`,
      'Accept-Language': 'en',
    },
  });

  const body = resp.text();
  console.log(`    状态: ${resp.status}`);
  console.log(`    响应: ${body.substring(0, 300)}`);

  if (resp.ok) {
    let data;
    try { data = JSON.parse(body); } catch { data = { raw: body }; }
    return { success: true, data, cookies: resp.cookies };
  }

  throw new Error(`验证失败 (${resp.status}): ${body.substring(0, 200)}`);
}

/**
 * Step 4: 登录获取 session
 * POST /api/login
 */
async function stepLogin(email, password) {
  console.log('  [Step 4] 登录...');

  await sleep(humanDelay(1000));

  const resp = await post(`${API_BASE}/api/login`, {
    email,
    password,
  }, {
    headers: {
      'Origin': config.siteBase,
      'Referer': `${config.siteBase}/app/auth/sign-in`,
      'Accept-Language': 'en',
    },
  });

  const body = resp.text();
  console.log(`    状态: ${resp.status}`);
  console.log(`    响应: ${body.substring(0, 300)}`);

  if (resp.ok) {
    let data;
    try { data = JSON.parse(body); } catch { data = { raw: body }; }
    return {
      success: true,
      data,
      cookies: resp.cookies,
      sessionCookie: resp.cookies.get('connect.sid'),
    };
  }

  console.log('    登录失败（可能需要先验证邮箱）');
  return { success: false, status: resp.status, body };
}

// ==================== 主注册流程 ====================

/**
 * 纯协议注册 ChatAIBot.pro 账号
 *
 * @param {object} account - { email, password, firstName, lastName, fullName }
 * @param {object} mailProvider - 邮箱 provider 实例
 * @returns {object} { success, account, session, error }
 */
export async function register(account, mailProvider) {
  console.log(`\n  ══════════════════════════════════════════════════`);
  console.log(`  注册: ${account.email}`);
  console.log(`  ══════════════════════════════════════════════════\n`);

  try {
    // Step 1: 注册
    await sleep(humanDelay(500));
    const regResult = await stepRegister(account);

    // Step 2: 获取 6 位验证码
    const senderFilter = config.senderFilter || 'chataibot';
    const token = await stepGetVerifyToken(mailProvider, senderFilter);
    if (!token) {
      console.log('\n  [警告] 未获取到验证码，账号已创建但未验证');
      console.log('         请手动检查邮箱完成验证');
      return {
        success: true,
        verified: false,
        account,
        session: { cookies: regResult.cookies },
        cookies: regResult.cookies,
      };
    }

    // Step 3: 提交验证
    await sleep(humanDelay(1000));
    const verifyResult = await stepVerify(account.email, token, regResult.cookies);

    // Step 4: 登录
    await sleep(humanDelay(1500));
    const loginResult = await stepLogin(account.email, account.password);

    return {
      success: true,
      verified: true,
      account,
      session: loginResult.data || verifyResult.data,
      cookies: loginResult.cookies || verifyResult.cookies || regResult.cookies,
      loginSuccess: loginResult.success,
    };
  } catch (e) {
    console.log(`\n  [错误] ${e.message}`);
    return {
      success: false,
      account,
      error: e.message,
    };
  }
}

/**
 * 探测 API (保留供调试用)
 */
export async function probe() {
  console.log('\n  ┌──────────────────────────────────────────────────┐');
  console.log('  │       ChatAIBot.pro API 探测                     │');
  console.log('  └──────────────────────────────────────────────────┘\n');

  const endpoints = [
    ['GET', '/api/register', null],
    ['POST', '/api/register', { email: 'probe@test.com', password: 'Probe123!' }],
    ['POST', '/api/register/verify', { email: 'probe@test.com', token: 'test' }],
    ['POST', '/api/login', { email: 'probe@test.com', password: 'Probe123!' }],
    ['POST', '/api/logout', {}],
  ];

  const results = [];

  for (const [method, path, body] of endpoints) {
    try {
      const opts = {
        headers: {
          'Origin': config.siteBase,
          'Referer': config.signupUrl,
        },
        followRedirect: false,
        timeout: 10000,
      };

      let resp;
      if (method === 'POST') {
        resp = await post(`${API_BASE}${path}`, body, opts);
      } else {
        resp = await get(`${API_BASE}${path}`, opts);
      }

      const text = resp.text();
      const status = resp.status;

      console.log(`  ${status} ${method} ${path}`);
      console.log(`    ${text.substring(0, 200)}`);
      console.log(`    Cookies: ${[...resp.cookies.keys()].join(', ') || '无'}`);

      results.push({ method, path, status, body: text.substring(0, 200) });
    } catch (e) {
      results.push({ method, path, status: 0, error: e.message });
    }
  }

  return results;
}