const request = require('request');
const cheerio = require('cheerio');
const STRING = require('string');
const logger = require('log4js').getLogger('history');

module.exports = {
  'getTechHistory': function() {
    let url;
    let d;
    let day;
    let month;
    const monthNames = [
      'January',
      'February',
      'March',
      'April',
      'May',
      'June',
      'July',
      'August',
      'September',
      'October',
      'November',
      'December'
    ];

    d = new Date();

    month = monthNames[d.getMonth()];

    day = d.getDate();

    url = ['http://www.computerhistory.org/tdih/', month, '/', day].join('');
    logger.debug(url);
    
    return new Promise(function(resolve, reject) {
      'use strict';

      request(url, function(err, resp, body) {
        if (err) 
          //  Logger.error(err);
          return reject(err);
        // Throw err;

        const $ = cheerio.load(body);
        const tdihbody = $('#tdihbody .tdihevent');
        const output = [];

        tdihbody.find('p').each(function(div) {
          const s = $(this).text();
          output.push(STRING(s).collapseWhitespace().s);
        });

        return resolve(output);
      }, function(error, response, body) {
        if (response.statusCode !== 200) {
          logger.error(response.statusCode);
          logger.error(body);
          
          return reject(error);
        }
      });
    });
  }, 'getHistory': function() {
    let url;
    const d = new Date();
    let day;
    let month;
    const monthNames = [
      'january',
      'february',
      'march',
      'april',
      'may',
      'june',
      'july',
      'august',
      'september',
      'october',
      'november',
      'december'
    ];

    month = monthNames[d.getMonth()];

    day = d.getDate();

    url = [
      'http://www.bbc.co.uk/scotland/history/onthisday/', month, '/',
      day
    ].join('');

    logger.debug(url);

    return new Promise(function(resolve, reject) {
      request(url, function(err, resp, body) {
        if (err) 
          //  Logger.error(err);
          return reject(err);
        // Throw err;

        const $ = cheerio.load(body);

        const nbody = $('DIV#bbcPageContent').first();
        const output = [];

        nbody.find('.story > p').each(function(div) {
          const s = $(this).text();
          if (s.indexOf('Today\'s recipe:') == -1) 
            output.push(s);
        });

        return resolve(output);
      }, function(error, response, body) {
        if (response.statusCode !== 200) {
          logger.error(response.statusCode);
          logger.error(body);
          
          return reject(error);
        }
      });
    });
  },
  'updateHistory': function() {
    'use strict';
    let output = [];

    return new Promise(function(resolve, reject) {
      module.exports.getHistory()
        .then((d) => {
          output = d;

          module.exports.getTechHistory()
            .then((d) => {
              output = output.concat(d);

              return resolve(output);
            })
            .catch((e) => {
              logger.error(e);
              
              return reject(e);
            });
        })
        .catch((e) => {
          logger.error(e);
          
          return reject(e);
        });
    });
  }
};