const puppeteer = require("puppeteer");
const opn = require("opn");
const nodemailer = require("nodemailer");

const timeout = 5000;
const waitForTimeout = 1000;

const cartLink =
  "https://store.nvidia.com/store/nvidia/en_US/buy/productID.5438481700/clearCart.yes/nextPage.QuickBuyCartPage";

const emailUsername = process.env.EMAIL_USERNAME;
const emailPassword = process.env.EMAIL_PASSWORD;

const transporter = nodemailer.createTransport({
  service: "gmail",
  auth: {
    user: emailUsername,
    pass: emailPassword,
  },
});

const mailOptions = {
  from: emailUsername,
  to: emailUsername,
  subject: "NVIDIA - BUY NOW",
  text: cartLink,
};

async function buy() {
  const links = [
    "https://www.nvidia.com/en-us/geforce/buy/",
    "https://www.nvidia.com/en-us/shop/geforce/?page=1&limit=9&locale=en-us&search=3080",
    "https://www.bestbuy.com/site/nvidia-geforce-rtx-3080-10gb-gddr6x-pci-express-4-0-graphics-card-titanium-and-black/6429440.p?skuId=6429440",
  ];
  for (const link of links) {
    await goto(link);
  }

  setTimeout(buy, timeout);
}

async function goto(link) {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  await page.setUserAgent(
    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
  );

  page.setViewport({
    width: 1920,
    height: 1080,
  });

  await page.goto(link);
  await page.waitFor(waitForTimeout);

  const dom = await page.evaluate(() => {
    return {
      body: document.body.innerText,
    };
  });

  console.log(dom);

  if (dom.body.toLowerCase().includes("out of stock") || dom.body.toLowerCase().includes("sold out")) {
    console.log("still out of stock, will try again.");
  } else {
    console.log("*** IN STOCK, BUY NOW ***");
    await page.screenshot({ path: `nvidia-${Date.now()}.png` });
    opn(cartLink);
    if (emailUsername && emailPassword) {
      transporter.sendMail(mailOptions, function (error, info) {
        if (error) {
          console.log(error);
        } else {
          console.log("email sent: " + info.response);
        }
      });
    }
  }

  await browser.close();
}

try {
  buy();
} catch (error) {
  buy();
}