const fetch = require('node-fetch');
const cheerio = require('cheerio');
const { allRERequest, findPointInsideBoundingBox } = require('../url');
const { getRealEstateTypeEnum } = require('../enums');
const { getRegion, getMunicipality } = require('../codes')
const Promise = require("bluebird");

module.exports = class OlxCrawler {
    //TODO figure best way to handle paging
    constructor(fromPage = 0, toPage = 10, maxResults = 1000) {
        this.fromPage = fromPage;
        this.toPage = toPage;
        this.maxResults = maxResults;
    }

    async indexSingle(url, email) {
        try {
            const res = await fetch(url);
            const body = await res.text();
            const $ = cheerio.load(body);

            //TODO figure out what to do with username
            const username = $('#lg > div.desno2.profil > div:nth-child(2) > div.vrsta1.vrsta_desno > a > div.username > span').text();

            // if (IGNORED_USERNAMES.includes((username || '').toLowerCase())) {
            //     return null;
            // }

            //TODO remove properties that are not needed, and add some if they are missing
            const title = $('#naslovartikla').text();
            const realEstateType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(3) > div > span:nth-child(3) > a > span').text();

            const price = $('#pc > p:nth-child(2)').text();
            const size = $('#dodatnapolja1 > div:nth-child(1) > div.df2').text();
            const rooms = $('#dodatnapolja1 > div:nth-child(2) > div.df2').text();
            const address = $('#dodatnapolja1 > div:nth-child(5) > div.df2').text();
            const gardenSize = $('#dodatnapolja1 > div:nth-child(6) > div.df2').text();
            const location = $('#artikal_glavni_div > div.artikal_lijevo > div.op.pop.mobile-lokacija').attr('data-content');

            const adType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(2) > div.df2').text();
            const time = $('time').attr('datetime');
            const olxId = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(4) > div.df2').text();

            const descriptions = $('.artikal_detaljniopis_tekst');
            // const floor = $('#dodatnapolja1').find(':contains(Sprat)').last().nextAll().text();
            const latLngRe = /LatLng\(([0-9]+\.[0-9]+)\,\s+([0-9]+\.[0-9]+)\)/g;
            const imgRe = /href":("[^"]*")/g;
            const matches = latLngRe.exec(body);
            let lng = '',
                lat = '';


            const parseRooms = (rooms) => parseInt([...rooms].filter(c => !isNaN(c)).filter(c => c.trim()).join())
            const parsePrice = (price) => parseFloat(price.replace(".", ""))


            // TODO we dont save images ??

            // const images = [];
            // const imgMatches = body.match(imgRe);

            // for (let i = 0; imgMatches && i < imgMatches.length; i++) {
            //     let img = imgMatches[i].replace("href\":", "")
            //     img = img.replace("\"", "");
            //     img = img.replace("\"", "");
            //     images.push(img);
            // }

            // const uploadPromises = images.map(img => {
            //     const imgFixed = eval(`'${img}'`);
            //     return cloudinary.uploader.upload(eval(`'${img}'`));
            // });

            // const uploadResults = await Promise.all(uploadPromises);
            // const cloudinaryImages = uploadResults.map(ur => ur.url);

            if (matches && matches.length >= 3) {
                lat = matches[1];
                lng = matches[2];
            }

            const parsedPrice = parsePrice(price);

            const locationArray = location.split(",");
            const region = locationArray[0];
            const municipality = locationArray[1];

            const data = {
                realEstateType: this.getCategoryId(realEstateType),
                email : email,
                olxId: olxId,
                // category: category,
                url,
                title,
                price: isNaN(parsedPrice) ? price : parsedPrice,
                size: parseFloat(size),
                gardenSize: parseFloat(gardenSize),
                address,
                region,
                municipality,
                // adType: AD_TYPE_SALE,
                time,
                shortDescription: descriptions.first().text(),
                longDescription: descriptions.last().text(),
                lat,
                lng,
                loc: [parseFloat(lat), parseFloat(lng)],
                // images: cloudinaryImages
            };

            return data;
        } catch (e) {
            console.error('Exception caught: ' + e.message);
        }

        return null;
    }

    async indexPage(olxUrl, maxResults = 1000) {
        try {
            // console.log('Starting to index page: ' + pageNr);
            // const url = `http://www.olx.ba/pretraga?vrsta=samoprodaja&sort_order=desc&kategorija=23&sort_po=datum&kanton=9&stranica=${pageNr}`;

            const res = await fetch(olxUrl.url);
            const body = await res.text();
            const $ = cheerio.load(body);
            const hrefs = [];
            const results = [];

            $('#rezultatipretrage').find('.listitem').each((i, elem) => {
                const href = $(elem).find('a').first().attr('href');
                hrefs.push(href);
            });

            let actualNoOfResults = (hrefs.length <= maxResults) ? hrefs.length : maxResults;

            for (let i = 0; i < hrefs.length; i++) {
                console.log(`indexing: ${hrefs[i]}`);

                const singleData = await this.indexSingle(hrefs[i], olxUrl.email);

                if (singleData) {
                    results.push(singleData);
                }
                // await this.sleep(500);
            }

            return results;
        } catch (e) {
            console.error('Exception caught:' + e);
        }
    }

    getCategoryId (category) {
        if (category === 'Stanovi') {
          return 'stan';
        } else if (category === 'Vikendice') {
          return 'vikendica';
        } else if (category === 'Kuće') {
          return 'kuca';
        }
      }

    async indexPages(urls, start, end, maxResults = 1000) {
        // let results = {};
        // for (let i = start; i <= end; i++) {
        //     let result = await this.indexPage(i, maxResults);
        //     Object.assign(results, result)
        //     await this.sleep(5000);
        // }
        // return results;

        let results = [];
        for (let url of urls) {
            let result = await this.indexPage(url, maxResults);
            // Object.assign(results, result)
            results.push(result);
            // await this.sleep(5000);
        }
        return results;
    }

    async crawl() {

        const filteredResults = [];
        const realestateRequests = await allRERequest()
        const urls = this.createRequestUrls(realestateRequests);
        let results = await this.indexPages(urls, this.fromPage, this.toPage, this.maxResults);

        for (const result of results) {
            for (const re1 of result) {
                if (re1.lat !== undefined && re1.lat !== null && re1.lat !== "") {
                    const pointInsideBoundingBox = await findPointInsideBoundingBox([re1.lng, re1.lat]);

                    if (pointInsideBoundingBox[0].length !== 0) {
                        filteredResults.push(re1);
                    }
                }
            }
        }

        console.log(filteredResults);
        return filteredResults;
    }

    createRequestUrls(realestateRequests) {
        const urls = []

        for (const request of realestateRequests) {
            const realsestateType = "kategorija=" + getRealEstateTypeEnum(request.realEstateType).olxCategory;
            const region = "kanton=" + getRegion(request.region).olxid;
            const municipality = "grad%5B%5D=" + getMunicipality(request.region, request.municipality).olxid;
            const sizeMin = "kvadrata_min=" + request.sizeMin;
            const sizeMax = "kvadrata_max=" + request.sizeMax;
            const priceMin = "od=" + request.priceMin;
            const priceMax = "do=" + request.priceMax;

            const olxUrl = {
                url: "https://www.olx.ba/pretraga?" + realsestateType + "&id=2&stanje=0&vrstapregleda=tabela&sort_order=desc&" + region + "&" + municipality + "&" + priceMin + "&" + priceMax + "&vrsta=samoprodaja&" + sizeMin + "&" + sizeMax,
                email: request.email
            }
            console.log(olxUrl.url);
            urls.push(olxUrl);
        }

        return urls;
    }
};