const cheerio = require("cheerio");
const cron = require("node-cron");
const axios = require("axios");
const fs = require("fs");

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

// new version works with ceneo.pl only
const productsIds = ["182928416", "95706396", "90180325"];

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

async function compareAndSave(productsPrice) {
  if (!fs.existsSync("productsPrice.json")) {
    fs.writeFileSync("productsPrice.json", "[]");
  }

  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.name === product.name
    );

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

  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 init() {
  const products = [];

  for (const productId of productsIds) {
    const response = await axios.get(`https://www.ceneo.pl/${productId}`);
    const $ = cheerio.load(response.data);

    const items = $(".product-offer__container").first();
    for (const item of items) {
      let name = $(item).data("productname");
      let price = $(item).data("price");
      let link = `https://www.ceneo.pl/${$(item).data("click-url")}`;
      const shop = $(item).data("shopurl") || "ceneo.pl";

      if (!name || !price) {
        name = $(item).find(".short-name__txt").text();
        price = $(item).find(".price").text();
        link = `https://www.ceneo.pl/${productId}`;
      }

      if (!name || !price || !link) {
        continue;
      }

      products.push({ name, price, link, shop });
    }
  }

  await compareAndSave(products);
  console.log("Sprawdzone! Aktualne ceny zapisane w productsPrice.json");
}

sendMessage("Zaczynam monitoring cen");
const task = cron.schedule("0 6,9,12,14,16,18,21 * * *", init, {
  timezone: "Europe/Warsaw",
});

task.execute();