price-bot/index.js

const cheerio = require("cheerio");
const cron = require("node-cron");
const axios = require("axios");
const { chromium } = require("playwright");
const fs = require("fs");

const discordWebhook =
  "https://discord.com/api/webhooks/1439286509390921749/t2Hb8XloF6zhDRYD1yh_QlkHHa9eHUyXvd9TxZRHwqR_b_OxxbnwDgsm4em8TwA9NQIa";

const priceSelectors = {
  miodowamydlarnia: ".projector_prices__price",
  greentouch: ".main-price",
  amazon: "#corePrice_feature_div .a-price .a-offscreen",
  soxo: "#projector_price_value span",
  empik: '[data-ta-section="priceMainContainer"] [data-ta="price"]',
  notino: "#pd-price",
};

const excludePage = ["allegro", "homla.com.pl", "home-you.com"];

function sendMessage(message) {
  axios.post(discordWebhook, {
    content: message,
  });
}

async function compareAndSave(productsPrice) {
  const productsPriceJson =
    fs.readFileSync("productsPrice.json", "utf8") || "[]";
  const oldProductsPrice = JSON.parse(productsPriceJson);

  const diffProducts = [];

  for (const product of productsPrice) {
    const oldProduct = oldProductsPrice.find(
      (oldProduct) => oldProduct.link === product.link
    );

    if (oldProduct && oldProduct.price !== product.price) {
      diffProducts.push({
        name: product.name,
        newPrice: product.price,
        oldPrice: oldProduct.price,
        link: product.link,
      });
    }
  }

  for (const product of diffProducts) {
    sendMessage(
      `Zmiana ceny **${product.name}**:\nCena: ${product.oldPrice} -> ${product.newPrice}\nLink: ${product.link}`
    );
  }

  if (diffProducts.length === 0) {
    sendMessage("Brak zmian w cenach");
  }

  fs.writeFileSync(
    "productsPrice.json",
    JSON.stringify(productsPrice, null, 2)
  );
}

async function getProducts() {
  const products = await axios
    .get(
      "https://db.maciaszek.ovh/api/collections/gifts_items/records?fields=title,link"
    )
    .then((response) => response.data.items);

  return products
    .filter((product) => product.link !== "")
    .filter(
      (product) => !excludePage.some((page) => product.link.includes(page))
    );
}

async function init() {
  const productsWithLinks = await getProducts();
  const productsWithBrowser = [];
  const productsPrice = [];
  const selectors = Object.keys(priceSelectors);

  console.log("Zaczynam sprawdzać ceny");
  for (const product of productsWithLinks) {
    if (product.link === "") continue;

    try {
      const { data } = await axios.get(product.link, {
        headers: {
          "User-Agent":
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36",
        },
      });

      const $ = cheerio.load(data);
      const selector = selectors.find((selector) =>
        product.link.includes(selector)
      );
      const price = $(priceSelectors[selector]).text();
      productsPrice.push({
        name: product.title,
        price: price,
        link: product.link,
      });
    } catch {
      productsWithBrowser.push(product);
    }
  }

  if (productsWithBrowser.length > 0) {
    const browser = await chromium.launch();
    const context = await browser.newContext({
      userAgent:
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36",
    });
    const page = await context.newPage();

    for (const product of productsWithBrowser) {
      await page.goto(product.link);
      const selector = selectors.find((selector) =>
        product.link.includes(selector)
      );
      const element = await page.$(priceSelectors[selector]);

      if (!element) continue;

      const price = await element.textContent();
      productsPrice.push({
        name: product.title,
        price: price,
        link: product.link,
      });
    }

    await browser.close();
  }

  await compareAndSave(productsPrice);

  console.log("Done! Check productsPrice.json");
}

sendMessage("Zaczynam monitoring cen");
const task = cron.schedule("* */3 * * *", async () => {
  await init();
});

task.execute();