'use strict';

// Public modules from npm
const puppeteer = require('puppeteer');

// Modules from file
const shared = require('./shared.js');

/**
 * @protected
 * Create a Chromium instance used to navigate with Puppeteer.
 * By default the browser is headless.
 * @returns {Promise<puppeteer.Browser>} Created browser
 */
module.exports.prepareBrowser = async function () {
  // Create a headless browser
  let browser = null;
  if (shared.chromiumLocalPath) {
    browser = await puppeteer.launch({
      executablePath: shared.chromiumLocalPath,
      headless: !shared.debug, // Use GUI when debug = true
    });
  } else {
    browser = await puppeteer.launch({
      headless: !shared.debug, // Use GUI when debug = true
    });
  }

  return browser;
};

/**
 * @protected
 * Prepare a page used to navigate the browser.
 * The page is set up to reject image download requests. The user agent is also changed.
 * @param {puppeteer.Browser} browser Browser to use when navigating where the page will be created
 * @returns {Promise<puppeteer.Page>} New page
 */
module.exports.preparePage = async function (browser) {
  // Create new page in the browser argument
  const page = await browser.newPage();

  // Block image download
  await page.setRequestInterception(true);
  page.on('request', (request) => {
    if (request.resourceType() === 'image') request.abort();
    else if (request.resourceType === 'font') request.abort();
    // else if (request.resourceType() == 'stylesheet') request.abort();
    // else if(request.resourceType == 'media') request.abort();
    else request.continue();
  });

  // Set custom user-agent
  const userAgent =
    'Mozilla/5.0 (X11; Linux x86_64)' +
    'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.39 Safari/537.36';
  await page.setUserAgent(userAgent);

  return page;
};