/**
 * Created by WebStorm.
 * User: martin
 * Date: 15/04/2020
 * Time: 11:55

 */

const cheerio = require('cheerio');

const axios = require('axios');
const fecha = require('fecha');

const fs = require('fs');

const dbmanager = require('../lib/dbmanager');

const filterReject = require('../lib/filter_reject');
const filterAccept = require('../lib/filter_md_jobs');

class IndeedScraper {

  constructor() {
    this.url = '';
    this.items = [];
    this.currentPage = null;
    this.host = 'www.indeed.co.uk';

    // this.setStartUrl('https://www.indeed.co.uk/jobs?as_and=&as_phr=&as_any=javascript+node&as_not=&as_ttl=&as_cmp=&jt=contract&st=&as_src=&salary=&radius=25&l=london&fromage=1&limit=50&sort=date&psf=advsrch&from=advancedsearch');
  }

  setStartUrl(newUrl) {
    this.url = newUrl;
  }

  loadPage(page) {
    this.currentPage = page;
  }

  async getPage() {
    console.log('>> getPage: fetching', this.url);
    const now = fecha.format(new Date(), 'YYYY-MM-DD--hhmmss');
    const filename = `indeed-${now}.html`;
    const response = await axios.get(this.url).catch((err) => {
      console.error(err);
    });

    console.log(response.status);

    if (response.status === 200) {
      console.log(response);

      /* try{
               fs.writeFileSync(`../test/data/indeed/${filename}`, response.data);
             }
             catch(err) {
               console.error(err);
             }*/
      const $ = cheerio.load(response.data);
      this.loadPage($);
    }
  }

  async addToDB() {
    for(const item of this.items) {
      console.log(item);

      dbmanager.insertOne(item)
        .then((data) => {
          console.log(data);
        })
        .catch((err) => {
          console.error(err.message || 'Some error occurred while querying the database.');
        });
    }
  }

  async filterAdverts() {
    console.log('>> FilterAdverts');
    console.log(`Currently ${this.items.length} items...`);

    this.items = this.items.filter(filterReject);

    console.log(`After reject ${this.items.length} items...`);

    this.items = this.items.filter(filterAccept);

    console.log(`After accept ${this.items.length} items...`);
  }

  // Site specific parts below here

  async breakPage() {
    const $ = this.currentPage;
    const ads = [];

    const sections = $('div.row.result');

    await sections.each(async (index, item) => {
      // console.log($(item).html());
      const ad = await this.extractDetails(item);
      ads.push(ad);
      // console.log('<<<<<<<<<>>>>>>>>>');
    });

    this.items = [...this.items, ...ads];
  }

  async extractDetails(part) {
    const newObj = {};
    const $part = cheerio.load(part);
    const now = ~~(new Date().getTime() / 1000.0);

    newObj.title = $part('.jobtitle')
      .text()
      .trim();
    newObj.site = 'indeed';
    newObj.url = `https://${ this.host }${$part('.jobtitle').attr('href')}`;
    newObj.id = $part('h2.title a').attr('id').trim();
    newObj.summary = $part('.summary').text().trim();

    newObj.company = $part('.company').text().trim() || null;

    newObj.location = $part('.location').text().trim();

    newObj.postDate = $part('.date').text().trim();

    newObj.salary = $part('.salary.no-wrap').text().trim();

    newObj.isEasyApply = $part('.iaLabel').text().trim() === 'Easily apply';
    newObj.timestamp = now;

    // console.log(newObj);
    return newObj;
  }

  async checkNext() {
    const $ = this.currentPage;
    let next = $('.pagination > *:last-child').attr('href') || '';
    if (next !== '')
      next = `https://${ this.host }${next}`;

    console.log(next);
  }

  async processSite() {
    console.log('Processing...');

    let nextPage;
    let previousPage = '';
    // do {
    previousPage = this.url;
    await this.getPage();

    await this.breakPage();

    await this.checkNext();

    nextPage = await this.checkNext();

    //  if (nextPage === previousPage) nextPage = '';

    //  this.setStartUrl(nextPage);
    // }while (nextPage !== '');

    await this.filterAdverts();

    await this.addToDB();
  }

  async go() {
    this.setStartUrl('https://www.indeed.co.uk/jobs?as_and=&as_phr=&as_any=javascript+node&as_not=&as_ttl=&as_cmp=&jt=contract&st=&as_src=&salary=&radius=25&l=london&fromage=1&limit=50&sort=date&psf=advsrch&from=advancedsearch');
    // this.setStartUrl('https://www.indeed.co.uk/jobs?as_and=&as_phr=&as_any=javascript+node&as_not=&as_ttl=&as_cmp=&jt=contract&st=&as_src=&salary=&radius=25&l=london&fromage=7&limit=10&sort=date&psf=advsrch&from=advancedsearch');

    await this.processSite();
  }

}

const ind = new IndeedScraper();

ind.go();

module.exports = IndeedScraper;