torob

torob.js

const axios = require("axios");
require("dotenv").config();
const { toToman } = require("./helpers");

class TorobProduct {
    /**
     * @type {[Object]}
     */
    #url;

    /**
     * @type {[Object]}
     */
    #offers;

    /**
     * @type {Object}
     * @property {Number} lowPrice
     * @property {Number} highPrice
     * @property {Number} offersCount
     */
    #offersInfo;

    /**
     * @param {String} url
     */
    constructor(url) {
        this.#validateUrl(url);
        this.#url = url;
    }

    /**
     * @param {String} url
     */
    #validateUrl(url) {
        if (!url) throw new Error("Url is required to create torob product");
        if (url.includes("http://"))
            throw new Error(`Please use "https" in your url`);
        if (!url.startsWith("https://torob.com/p/"))
            throw new Error(
                "Url is not valid / should be start with  https://torob.com/p/"
            );
    }

    async init() {
        const product = await this.#loadProduct();
        const productOffers = product.offers;
        this.#offers = this.#generateOffers(productOffers.offers);
        this.#offersInfo = this.#generateOffersInfo(productOffers);
        return this;
    }

    /**
     * @returns {Promise<Object>}
     */
    async #loadProduct() {
        if (this.#offers)
            throw new Error("Product is already loaded and initialized");
        let pageHtml = "";
        try {
            // const { data } = await axios.get({
            //     url: this.#url,
            //     method: "get",
            //     maxBodyLength: Infinity,
            //     headers: {
            //         authority: "torob.com",
            //         accept:
            //             "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
            //         "accept-language": "en-US,en;q=0.9,fa;q=0.8",
            //         "cache-control": "max-age=0",
            //         cookie:
            //             "is_torob_user_logged_in=False; send_amplitude_events_v3=False; search_session=jklwnxmpdhtsbmnqyktkpvbysvcrmuif; returning_user=true; _gcl_au=1.1.1967373111.1682147733; _gid=GA1.2.340567467.1682147734; _clck=c34r4s|1|faz|0; _ym_uid=1682147734564296583; _ym_d=1682147734; _ym_isad=2; _ga=GA1.1.1872906749.1682147734; _ga_CF4KGKM3PG=GS1.1.1682147733.1.1.1682147736.0.0.0; _ym_visorc=b",
            //         "sec-ch-ua":
            //             '"Chromium";v="112", "Google Chrome";v="112", "Not:A-Brand";v="99"',
            //         "sec-ch-ua-mobile": "?0",
            //         "sec-ch-ua-platform": '"Windows"',
            //         "sec-fetch-dest": "document",
            //         "sec-fetch-mode": "navigate",
            //         "sec-fetch-site": "same-origin",
            //         "sec-fetch-user": "?1",
            //         "upgrade-insecure-requests": "1",
            //         "user-agent":
            //             "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36",
            //     },
            // });
            // use fetch insted 
            const data = await (await fetch(this.#url)).text()
            if (data) pageHtml = data;
        } catch (error) {
            // if (error.response.status === 404) {
            if (error?.response?.data?.includes("صفحه یافت نشد")) {
                throw new Error(`Product with url ${this.#url} not found`);
            }
            if (error.code == "ENOTFOUND") {
                throw new Error(
                    `May be you have a problem with your internet connection or site is offline`
                );
            }
            throw error;
        }
        const productJson = this.#selectJsonFromHtml(pageHtml);
        return JSON.parse(productJson);
    }

    /**
     *
     * @param {String} html
     * @returns Product json
     */
    #selectJsonFromHtml(html) {
        const startStr = '<script type="application/ld+json">';
        const endStr = '</script><script type="application/ld+json">';
        const startIndex = html.indexOf(startStr) + startStr.length;
        const endIndex = html.indexOf(endStr);
        const selectedText = html.substring(startIndex, endIndex);
        return selectedText;
    }

    /**
     *
     * @param {Array} offers
     * @returns {Array}
     */
    #generateOffers(offers) {
        return offers.map((offer) => {
            return {
                name: offer.name,
                price: toToman(offer.price),
                isAdv: this.#isAdv(offer),
                shopRank: this.#getShopRank(offer),
                name: offer.name,
            };
        });
    }

    /**
     * @param {[Object]} offer
     * @returns {[Object]}
     */
    #generateOffersInfo(productOffers) {
        const offersInfo = { ...productOffers };
        return {
            lowPrice: toToman(offersInfo.lowPrice),
            highPrice: toToman(offersInfo.highPrice),
            shopsCount: this.offers().length,
        };
    }

  /**
   * low price in toman
   * @returns {Number}
   */
    lowPrice() {
        return this.#offersInfo.lowPrice;
    }

  /**
   * high price in toman
   * @returns {Number}
   */
    highPrice() {
        return this.#offersInfo.lowPrice;
    }

    /**
     * @returns {Number}
     */
    offerCount() {
        return this.#offers.length;
    }

    /**
     * @returns {Number}
     */
    avragePrice() {
        const prices = this.#offers.map((offer) => offer.price);
        let sum = prices.reduce((acc, val) => acc + parseInt(val), 0);
        let avg = sum / prices.length;
        return Math.floor(avg);
    }

    /**
     * @returns {[Object]}
     */
    offers() {
        return this.#offers;
    }

    /**
     * @returns {[Object]}
     */
    offersWitoutAdv() {
        return this.#offers.filter((offer) => offer.isAdv === false);
    }

    /**
     * @param {Object} offer
     * @returns {Boolean}
     */
    #isAdv(offer) {
        return offer.url.includes("is_adv=True");
    }

    /**
     * @param {Object} offer
     * @returns {Number | null}
     */
    #getShopRank(offer) {
        return offer.url.match(/shop_rank=(\d+)/)?.[1] ?? null;
    }
}

// async function main() {
//     const torobProduct = await new TorobProduct(
//         "https://torob.com/p/b0b6b7b3-d1d9-4cfb-b0d8-8cc0a95b02f3/%DA%AF%D9%88%D8%B4%DB%8C-%D8%B3%D8%A7%D9%85%D8%B3%D9%88%D9%86%DA%AF-a23-%D8%AD%D8%A7%D9%81%D8%B8%D9%87-128-%D8%B1%D9%85-4-%DA%AF%DB%8C%DA%AF%D8%A7%D8%A8%D8%A7%DB%8C%D8%AA/"
//     ).init();
//     console.log(torobProduct.init());
// }
// main();

module.exports = TorobProduct;