const { PATH_FILES } = require('../config')
const logger = require('../log/index')
const puppeteer = require('puppeteer');
const fs = require('fs')
const path = require('path')

function checkCache (fPath) {
  try {
    const fStat = fs.statSync(fPath)
    if (fStat) {
      const isFile = fStat.isFile()
      if (isFile) {
        return fPath
      }
    }
    return false
  } catch (err) {
    return false
  }
}

function wait(ms) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      console.log("Done waiting");
      resolve(ms)
    }, ms)
  })
}


async function createPDFOfURL (url, config = {}) {
  config = Object.assign( {
    filename: '',
    dir: '',
    cache: true,
    width: '950px',
    height: '1360px',
    margin: {
      top: 0,
      bottom: 0
    },
  }, config)
  // 文件路径
  const outPath = path.join(PATH_FILES, config.dir)
  if (!fs.existsSync(outPath)) {
    fs.mkdirSync(outPath);
  }
  const outConfig = Object.assign({path: `${config.filename}.pdf`, width: config.width, height: config.height,printBackground: true }, config)
  outConfig.path = path.join(outPath, outConfig.path)
  // 检查缓存
  if (config.cache) {
    const result = checkCache(outConfig.path)
    if (result) {
      logger.log.debug('命中缓存文件')
      return result
    }
  }
  // 生成
  logger.log.debug('启动', new Date().toLocaleString())
  const browser = await puppeteer.launch({
    headless: true,
    args: ['--no-sandbox', '--disable-setuid-sandbox']
  });
  const page = await browser.newPage();
  await page.setDefaultNavigationTimeout(0)
  await page.goto(url, {waitUntil: 'networkidle2'});
  await wait(1000)
  logger.log.debug('等待生成', new Date().toLocaleString())

  await page.pdf(outConfig);
  await browser.close();

  logger.log.debug('当前时间', new Date().toLocaleString())
  return outConfig.path
}

module.exports = createPDFOfURL