const Scraper = require('../helpers/scraper');
const cheerio = require('cheerio');
const path = require('path');
const jsonfile = require('jsonfile');
const url = require('url');
const logger = require('log4js').getLogger('CY');

logger.level = process.env.LOGGER_LEVEL || 'warn';

// load env variables from file

class CYScrape extends Scraper {

  constructor() {
    super();
    this.setID('CY');

    this.addToBlockFilters(['recaptcha']);

    this.on('done', () => {
      this._done();
    });

    this.run = this._debounce(async () => {
      await this.__run();
    }, 5000);

    if (process.env.NODE_ENV === 'production')
      this._checkLock().then((l) => {
        if(l)
          this.run();
      });
  }

  /**
   * 
   * @param selector
   * @returns {Promise<void>}
   */
  async grabLink(selector) {
    const clickableLinks = await this.page.$$(selector);

    await this.page._client.send('Page.setDownloadBehavior', { 'behavior': 'allow', 'downloadPath': this.path });

    if (clickableLinks.length > 0)
      for (const item of clickableLinks) {
        const href = await this.page.evaluate(el => el.href, item);
        await this._randomWait(this.page, 3, 5);
        await this.page.goto(href, { 'waitUntil': 'networkidle2' }).catch((err) => {
          // log this error but Puppeteer isn't supposed to support this sort of download....
          // mute the ERR_ABORTED error which happens everytime but alert for everything else.

          if (!err.message.includes('net::ERR_ABORTED') )
            logger.error('grabLink', err);
        });
      }
  }

  /**
   *
   * @param id
   * @returns {Promise<void>}
   */
  async downloadEmoney(id) {
    const selector = ['#generic_article > div > div.row > div > div > ul > li:nth-child(1) > a', '#generic_article > div > div.row > div > div > ul > li:nth-child(2) > b > b > a'];

    await this.grabLink(selector[id]);
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async downloadExcel() {
    const selector = '#workshops > div > div.workshop-article-container > div > div > div > h3 > a';

    await this.grabLink(selector);
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async handlePaymentInstitutions() {
    await this._randomWait(this.page, 3, 5);

    const filename = 'licensing-and-supervision-of-payment-institutions';

    await this._makeScreenshotV2(this.page, `${this.path}/${filename}_main`, null);
    await this._randomWait(this.page, 3, 5);

    await this.downloadExcel();
    await this._randomWait(this.page, 3, 5);

    await this.page.goto(this.eMoneyUrl, { 'waitUntil': 'networkidle2' });
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async handleElectronicMoneyInstitutions() {
    await this._randomWait(this.page, 3, 5);

    const filename = 'licensing-and-supervision-of-electronic-money-institutions';

    await this._makeScreenshotV2(this.page, `${this.path}/${filename}_main`, null);
    await this._randomWait(this.page, 3, 5);

    await this.downloadEmoney(0);
    await this._randomWait(this.page, 3, 5);

    await this.downloadEmoney(1);
    await this._randomWait(this.page, 3, 5);
    this.emit('startProcessingCreditServices');
  }

  /**
   *
   * @param body
   * @returns {Promise<{}|Array>}
   */
  async extractLocalCreditInstitutions(body) {
    try{
      const matchHeading = /LOCAL AUTHORISED CREDIT INSTITUTIONS/;
      const sanity = /(\d+\.\s)(.+)/;
      const $ = cheerio.load(body, {
        'normalizeWhitespace': true
      });

      let nextItem;

      $('p').each(function(i, elem) {
        const lineText = $(this).text();

        const isHeading = matchHeading.test(lineText);
        if (isHeading)
          nextItem = $(this).next();
      });

      if (typeof nextItem !== 'undefined' && nextItem !== null) {
        const splitText = $(nextItem).text().split('\n');

        const output = [];

        splitText.forEach((item) => {
          const newItem = this._cleanUp(item);

          if ( newItem !== '')
            output.push( sanity.exec(newItem)[2]);
        });

        return output;
      }

      return {};
    }
    catch( err) {
      logger.error(err);
    }
  }

  /**
   *
   * @param body
   * @returns {Promise<void>}
   */
  async extractForeignCreditInstitutions(body) {
    try{
      const matchHeading = /FOREIGN AUTHORISED CREDIT INSTITUTIONS AND BRANCHES OF FOREIGN CREDIT INSTITUTIONS FROM EU MEMBER STATES OPERATING/;

      const sanity = /(\w+\.\s+)(.+)/;

      const $ = cheerio.load(body, {
        'normalizeWhitespace': true
      });

      const output = {};

      let nextItem;

      $('p').each(function(i, elem) {
        const lineText = $(this).text();
        const isHeading = matchHeading.test(lineText);
        if (isHeading)
          nextItem = $(this).next();
      });

      // Rolling this out for ease as it could be changed by hand
      let nextElm;

      let firstHeadOrig, firstHead;

      if (typeof nextItem !== 'undefined' && nextItem !== null) {
        firstHeadOrig = this._cleanUp($(nextItem).text());
        firstHead = sanity.exec(firstHeadOrig)[2];
        output[firstHead] = {};

        nextElm = $(nextItem).next();

        const secondHeadOrig = this._cleanUp($(nextElm).text());
        const secondHead = sanity.exec(secondHeadOrig)[2];

        nextElm = $(nextElm).next();

        const li = $(nextElm).find('li');

        const arrayA = [];
        $(li).each(function (i, elem) {
          const lineText = $(this).text();

          arrayA.push(lineText);
        });

        output[firstHead][secondHead] = arrayA;
        nextElm = $(nextElm).next();
      }

      if (typeof nextElm !== 'undefined' && nextElm !== null) {
        const secondHeadOrig = this._cleanUp($(nextElm).text());
        const secondHead = sanity.exec(secondHeadOrig)[2];

        nextElm = $(nextElm).next();

        const li = $(nextElm).find('li');

        const arrayA = [];
        $(li).each(function (i, elem) {
          const lineText = $(this).text();

          arrayA.push(lineText);
        });

        output[firstHead][secondHead] = arrayA;
        nextElm = $(nextElm).next();
      }

      if (typeof nextElm !== 'undefined' && nextElm !== null) {
        firstHeadOrig = this._cleanUp($(nextElm).text());
        firstHead = sanity.exec(firstHeadOrig)[2];
        output[firstHead] = {};

        nextElm = $(nextElm).next();

        const secondHeadOrig = this._cleanUp($(nextElm).text());
        const secondHead = sanity.exec(secondHeadOrig)[2];

        nextElm = $(nextElm).next();

        const li = $(nextElm).find('li');

        const arrayA = [];
        $(li).each(function (i, elem) {
          const lineText = $(this).text();
          arrayA.push(lineText);
        });

        output[firstHead][secondHead] = arrayA;
        nextElm = $(nextElm).next();
      }

      if (typeof nextElm !== 'undefined' && nextElm !== null) {
        const secondHeadOrig = this._cleanUp($(nextElm).text());
        const secondHead = sanity.exec(secondHeadOrig)[2];

        nextElm = $(nextElm).next();

        const li = $(nextElm).find('li');

        const arrayA = [];
        $(li).each(function (i, elem) {
          const lineText = $(this).text();
          arrayA.push(lineText);
        });

        output[firstHead][secondHead] = arrayA;
      }

      return output;
    }
    catch(err) {
      logger.error(err);
    }
  }

  /**
   *
   * @returns {Promise<{local: Promise<*|void>}>}
   */
  async processCreditInstitute() {
    logger.info('Credit institutes');
    try{
      await this._makeScreenshotV2(this.page, `${this.path}/creditInstitutes`, null);

      const body = await this.page.content();

      await this._dumpFile(`${this.path}/creditInstitutes.html`, body);
      const $ = cheerio.load(body);

      const content = $('.generic_page-intro');

      const local = await this.extractLocalCreditInstitutions(content.html());
      const creditInstitutes = await this.extractForeignCreditInstitutions(content.html());

      await jsonfile.writeFile(`${this.path}/creditInstitutes.json`, { local, creditInstitutes });

      this.emit('done');
      
      return { local, creditInstitutes };
    }
    catch(err) {
      logger.error(err);
    }
  }

  /**
   *
   * @param filePath
   * @returns {Promise<void>}
   */
  async savePDF(filePath) {
    logger.info('Saving the pdf:', filePath);

    await this._randomWait(this.page, 5, 7);
    await this.page.pdf({ 'path': filePath, 'format': 'A4' });
    // this.emit('startProcessingCreditServices');
    logger.debug('!! i SHOULD EMIT SOMETHING HERE !!');
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async processNewPage() {
    // give the page a few seconds to settle
    const checkPDF = /(.pdf)/g;

    await this._randomWait(this.page, 3, 5);

    const pageUrl = url.parse(await this.page.url());

    if (pageUrl.href === 'chrome-error://chromewebdata/') {
      logger.warn('Directed to: chrome-error://chromewebdata/');
      this.emit('recover');

      return;
    }

    let currentPath = pageUrl.pathname;
    let pdfFile;

    if (checkPDF.test(currentPath)) {
      const splitPath = currentPath.split('/');

      pdfFile = splitPath.pop();
      currentPath = splitPath.join('/');
    }

    switch (currentPath) {

      case '/en/licensing-supervision/payment-institutions/licensing-and-supervision-of-payment-institutions':
        await this.handlePaymentInstitutions();
        break;
      case '/en/licensing-supervision/electronic-money-institutions/licensing-and-supervision-of-electronic-money-institutions':
        await this.handleElectronicMoneyInstitutions();
        break;
      case '/images/media/redirectfile/Electronic%20Money%20Institutions':
        logger.warn('We should only arrive here when in Non-headless mode');
        await this.savePDF(pdfFile);
        break;
      case '/en/licensing-supervision/banks/register-of-credit-institutions-operating-in-cyprus':

        await this.processCreditInstitute();
        break;
      default:

        await this._uploadError();
        throw new Error(`Unknown page: ${pageUrl.href}`);
        break;

    }
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async attachEvents() {
    logger.info('Attaching events');
    this.on('startProcessingCreditServices', async function() {
      await this._goto(this.credit);
    });
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async start() {
    try {
      super._start();
      this.creditServices = {
        'items': 0,
        'links': [],
        'step': 0,
        'visited': false,
        'done' : false,
        'searchDone' : false
      };

      this.startPage = 'https://www.centralbank.cy/en/licensing-supervision/payment-institutions/licensing-and-supervision-of-payment-institutions';
      this.eMoneyUrl = 'https://www.centralbank.cy/en/licensing-supervision/electronic-money-institutions/licensing-and-supervision-of-electronic-money-institutions';
      this.credit = 'https://www.centralbank.cy/en/licensing-supervision/banks/register-of-credit-institutions-operating-in-cyprus';

      this.path = path.resolve(`${__dirname }/../artefacts/CY/CBOC`);
      await this._createDirectory(this.path);

      await this._doNonRepudiation().catch((err) => {
        logger.warn(err);
      });

      await this._initBrowser(true);
      await this._createBrowserPage();

      this.page.on('domcontentloaded', this._throttle(async () => {
        this.processNewPage().catch((err) => {
          logger.error('processNewPage fail', err);
        });
      }, 2500));

      if (this.eventNames().length === 2)
        await this.attachEvents();

      await this.page.tracing.start({ 'path': `${this.path}/trace.json`, 'screenshots': true });

      await this.page.setViewport({ 'width': 1200, 'height': 800 });
      await this._goto(this.startPage);

      await this._randomWait(this.page, 3, 5);
    }
    catch (e) {
      throw new Error(e);
    }
  }

  /**
   *
   * @returns {Promise<void>}
   */
  async __run() {
    logger.info('Scraping Cyprus...');

    await this.start();
  }
}

module.exports = CYScrape;