/**
 * 在无头浏览器中将一个网页截图保存为图片
 */
const fs = require('fs')
const path = require('path')
const axios = require('axios')
const FormData = require('form-data')

const puppeteer = require('puppeteer');

const saveScreenshot = async (url) => {
  // 启动浏览器
  const browser = await puppeteer.launch({
    headless: true
  });
  // 打开页面
  const page = await browser.newPage();
  // 设置浏览器视窗
  page.setViewport({
    width: 1920,
    height: 1080,
  })
  // 地址栏输入网页地址
  await page.goto(url, {
    // 等界面加载完
    waitUntil: 'networkidle0'
  });
  capchaAndUpload(page);
  // 关闭浏览器
  // await browser.close();
};

saveScreenshot('file:///Users/admin/Desktop/headless/index.html');

async function capchaAndUpload(page) {
  await page.waitForSelector('#title');
  let store = await page.evaluate(() => JSON.stringify(localStorage));
  store = JSON.parse(store)
  let clip = await page.evaluate((scope) => {
    let {
      x,
      y,
      width,
      height
    } = document.getElementById('title').getBoundingClientRect();
    window.scope = scope;
    return {
      x,
      y,
      width,
      height
    };
  });
  const filename = `./preview/${store.questionId}.png`;
  const options = {
    path: filename,
    fullPage: false,
    clip
  }
  await page.screenshot(options);
  let buffers = fs.readFileSync(path.resolve(filename));//同步读取文件
  let base64 = Buffer.from(buffers).toString('base64');//转为base64编码字符串
  const formData = new FormData()
  formData.append('questionId', store.questionId)
  formData.append('imageBase64', base64)
  const reqUrl = 'https://front.mingxuejinbang.com/prod-api/front/questionCollection/uploadQuestionImage';
  axios.post(reqUrl, formData)
    .then((res) => {
      if (res.data.code === 200) {
        console.log(store.questionId + '上传成功！')
        // 获取下一个问题
        page.click('#next');
        setTimeout(() => {
          capchaAndUpload(page);
        }, 1000)
      } else {
        console.log('出错了')
      }
    });
}