const chromeArgs = [
    '--font-render-hinting=none', // Improves font-rendering quality and spacing
    '--no-sandbox',
    '--disable-setuid-sandbox',
    '--disable-gpu',
    '--disable-dev-shm-usage',
    '--disable-accelerated-2d-canvas',
    '--disable-animations',
    '--disable-background-timer-throttling',
    '--disable-restore-session-state',
    '--disable-web-security', // Only if necessary, be cautious with security implications
    '--single-process', // Be cautious as this can affect stability in some environments
  ];

//Page router vercel function config
export const config = {
  maxDuration: 150,// seconds. You'll need a paid plan to increase the duration above 10s as it's likely not enough time to complete the task. 
};

//App router vercel function config
//export const maxDuration = 150; 

import chromium from '@sparticuz/chromium';
import puppeteer, { Browser } from 'puppeteer';

let browser: Browser;
const isLocal = process.env.NODE_ENV === 'development';


const generatePDF = async ({ url }: { url: string }) => {

  // Chromium only ships with Open Sans font by default
  // You can load additional fonts using the `font` method
  // Load a font from a local file

  // await chromium.font("/var/task/fonts/NotoColorEmoji.ttf");

  // or

  // await chromium.font(
  //   "https://raw.githack.com/googlei18n/noto-emoji/master/fonts/NotoColorEmoji.ttf"
  // );


  chromium.setHeadlessMode = true;
  chromium.setGraphicsMode = false;

  const chromeArgs = [
    '--font-render-hinting=none', // Improves font-rendering quality and spacing
    '--no-sandbox',
    '--disable-setuid-sandbox',
    '--disable-gpu',
    '--disable-dev-shm-usage',
    '--disable-accelerated-2d-canvas',
    '--disable-animations',
    '--disable-background-timer-throttling',
    '--disable-restore-session-state',
    '--disable-web-security', // Only if necessary, be cautious with security implications
    '--single-process', // Be cautious as this can affect stability in some environments
  ];


  try {
    if (!browser?.connected) {
      browser = await puppeteer.launch({
        ...(isLocal
          ? { channel: 'chrome' }
          : {
            args: chromeArgs,
            executablePath: await chromium.executablePath(),
            ignoreHTTPSErrors: true,
            headless: true,
          }),
      });
    }
  } catch (error) {
    throw new Error('Failed to start browser');
  }


  const page = await browser.newPage();

  await page.emulateMediaType('print')

  const response = await page.goto(url, { waitUntil: 'networkidle0', timeout: 30000 });

  if (!response || !response.ok()) {
    throw new Error('Failed to load the page for PDF generation');
  }

  const pdf = await page.pdf({
    format: 'a4',
    omitBackground: true, // Omit background colors and images
    printBackground: true, // Include background graphics
  });


  const pages = await browser.pages();
  for (const openPage of pages) {
    await openPage.close(); // Close all open pages to avoid resource leaks
  }


  if (isLocal) {
    await browser.close(); // Close the browser if running locally
  }

  return pdf;
};