dcupachatbot/lib/controllers/getTimetableNext.js

DCU Personal Assistant chat bot for CA400 project

'use strict';

var request = require('request');
var cheerio = require('cheerio');
var HashMap = require('hashmap');

var getTimetableNext = function getTimetableNext(courseID, year, semester, callback) {

    if(semester == 1)
        var urlOption = 'https://www101.dcu.ie/timetables/feed.php?prog=' + courseID + '&per=' + year + '&week1=1&week2=19&hour=1-20&template=student';
    else
        var urlOption = 'https://www101.dcu.ie/timetables/feed.php?prog=' + courseID + '&per=' + year + '&week1=20&week2=31&hour=1-20&template=student';

    var options = {
        url: urlOption,
        strictSSL: false
    }

    request(options, function (error, response, html) {
        if (!error && response.statusCode == 200) {

            var date = new Date();
            var daysOfWeek = ['Sun','Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
            var today = 'Thu'; //daysOfWeek[date.getDay()];
            var hourNow = date.getHours();
            var map = new HashMap();
            var $ = cheerio.load(html);
            $("td[align='center']").each(function(i, element)
            {
                var day = $(this).parent().parent().parent().parent().parent().children().eq(0).text();
                var timeSlotConflict = false;
                if(!day)
                {
                    day = $(this).parent().parent().parent().parent().parent().prev().children().eq(0).text();
                    timeSlotConflict = true;
                }

                if(day == today)
                {
                    var module = $(this).text();
                    module = module.replace(/\s+/g, " ");

                    var lecturer = $(this).prev().text();
                    lecturer = lecturer.replace(/\s+/g, " ");

                    var location = $(this).parent().parent().parent().prev().find('tbody').children("[align='left']").eq(0).text();
                    location = location.replace(/\s+/g, " ");

                    var code = $(this).parent().parent().parent().next().find('tbody').find('tr').eq(0).text();
                    code = code.replace(/\s+/g, " ");

                    var weeks = $(this).parent().parent().parent().next().find('tbody').find('tr').eq(1).text();
                    weeks = weeks.replace(/\s+/g, " ");

                    var count = 0;
                    var timeSlot = $(this).parent().parent().parent().parent();
                    var timeSlotCheck = $(this).parent().children().eq(0).text();

                    var check = true;
                    while(check)
                    {
                        var columnLength = $(timeSlot).attr('colspan');
                        if(!columnLength)
                        {
                            count++;                       
                        }
                        else
                        {
                            columnLength = parseInt(columnLength,10);
                            count += columnLength;
                            if(columnLength == 4 && count == 4 && !timeSlotConflict)
                                count -= 2;
                        }
                        timeSlot = $(timeSlot).prev();
                        var checker1 = $(timeSlot).attr('rowspan');
                        var checker2 = $(timeSlot).attr('style');
                        if(checker1 && checker2 && checker2 == 'border-bottom:3px solid #000000;')
                            check = false;
                        if(timeSlotConflict == true && checker2 != 'undefined')
                            check = false;
                    }
                    count -= 1;
                    var startTime = $(this).parent().parent().parent().parent().parent().parent().children().eq(0).children().eq(count).text();
                    startTime = startTime.replace(/\s+/g, " ");

                    var reply = ' ' + module + '\n' + ' ' + startTime + '\n' + ' ' + lecturer + '\n' + location + '\n' + code ;
                    var classTime = parseInt(startTime,10);
                    if(hourNow < classTime)
                    {
                      classTime = classTime - hourNow;
                      map.set(classTime, reply);
                    }
                }
            });
            var min = 1000;
            map.forEach(function(value, key) {
              if(key < min)
                min = key;
            });
            map.forEach(function(value, key) {
              if(key == min)
                callback(error, value);
            });

        } else {
            // There was an error
            callback(error);
        }
    });
};

module.exports = getTimetableNext;