const automator = require('miniprogram-automator');
const path = require('path');

const PROJECT_PATH = path.resolve(__dirname, '../../unpackage/dist/dev/mp-weixin');
const CLI_PATH = 'D:\\wechat-dev-tools\\cli.bat';
const DEVTOOL_PORT = 45869;

/**
 * 启动微信小程序
 * @returns {Promise<MiniProgram>}
 */
async function launchMiniProgram() {
  console.log('[automator] 启动小程序...');
  const miniProgram = await automator.launch({
    projectPath: PROJECT_PATH,
    cliPath: CLI_PATH,
    port: DEVTOOL_PORT
  });
  console.log('[automator] 小程序已启动');
  return miniProgram;
}

/**
 * 连接已在运行的小程序
 */
async function connectMiniProgram() {
  return automator.connect({ port: DEVTOOL_PORT });
}

/**
 * 模拟微信登录流程
 * 通过调用 wx.login 获取 code，触发后端登录
 * @param {MiniProgram} miniProgram
 * @returns {Promise<void>}
 */
async function loginAsMember(miniProgram) {
  console.log('[automator] 执行会员登录流程...');

  try {
    // 调用微信登录接口
    await miniProgram.callWxMethod('login', {});
  } catch (err) {
    console.warn('[automator] wx.login 调用异常（可能已在模拟器中自动完成）:', err.message);
  }

  // 等待登录完成并跳转到首页
  await miniProgram.waitFor(1000);
}

/**
 * 等待当前页面 URL 匹配指定模式
 * @param {MiniProgram} miniProgram
 * @param {string} urlPattern - 页面路径模式
 * @param {number} timeout - 超时时间(ms)
 * @returns {Promise<Page>}
 */
async function waitForPage(miniProgram, urlPattern, timeout = 30000) {
  const startTime = Date.now();
  while (Date.now() - startTime < timeout) {
    try {
      const page = await miniProgram.currentPage();
      if (page && page.path && page.path.includes(urlPattern)) {
        console.log(`[automator] 页面已加载: ${page.path}`);
        return page;
      }
    } catch (e) {
      // 页面尚未准备好，继续等待
    }
    await miniProgram.waitFor(500);
  }
  throw new Error(`等待页面 "${urlPattern}" 超时 (${timeout}ms)`);
}

/**
 * 截图保存
 * @param {MiniProgram} miniProgram
 * @param {string} name - 截图名称
 * @returns {Promise<string>} 截图文件路径
 */
async function screenshot(miniProgram, name) {
  const screenshotsDir = path.resolve(__dirname, '../screenshots');
  const fs = require('fs');
  if (!fs.existsSync(screenshotsDir)) {
    fs.mkdirSync(screenshotsDir, { recursive: true });
  }
  const timestamp = Date.now();
  const safeName = name.replace(/[^a-zA-Z0-9_-]/g, '_');
  const filePath = path.join(screenshotsDir, `${timestamp}_${safeName}.png`);
  await miniProgram.screenshot({ path: filePath });
  console.log(`[automator] 截图已保存: ${filePath}`);
  return filePath;
}

/**
 * 通过 TabBar 切换页面
 * @param {MiniProgram} miniProgram
 * @param {number} index - TabBar 索引 (0:首页, 1:课程, 2:我的课程, 3:我的)
 * @returns {Promise<void>}
 */
async function switchTab(miniProgram, index) {
  console.log(`[automator] 切换到 TabBar 索引: ${index}`);
  await miniProgram.callWxMethod('switchTab', { url: getTabBarUrl(index) });
  await miniProgram.waitFor(1000);
}

/**
 * 获取 TabBar 页面 URL
 */
function getTabBarUrl(index) {
  const tabs = [
    '/pages/index/index',
    '/pages/search/search',
    '/pages/my-courses/my-courses',
    '/pages/profile/profile'
  ];
  return tabs[index] || tabs[0];
}

/**
 * 生成唯一测试数据标识
 */
function generateTestId() {
  return `e2e_${Date.now()}_${Math.random().toString(36).substring(2, 8)}`;
}

module.exports = {
  launchMiniProgram,
  connectMiniProgram,
  loginAsMember,
  waitForPage,
  screenshot,
  switchTab,
  getTabBarUrl,
  generateTestId,
  PROJECT_PATH,
  CLI_PATH,
  DEVTOOL_PORT
};