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const Promise = require('bluebird');
const cheerio = require('cheerio');
const iconv = require('iconv-lite');
const debounce = require('promise-debounce');
const _ = require('lodash');
const request = Promise.promisify(require('request'));
const getUrlOfUser = require('./getURLOfUser');
let meetingpointData;
let lastUpdate;
function scrapeUsers(html) {
const page = cheerio.load(html);
const script = page('script').eq(1).text();
const regexs = [/var classes = \[(.+)\];/, /var teachers = \[(.+)\];/, /var rooms = \[(.+)\];/, /var students = \[(.+)\];/];
const items = regexs.map(regex => script.match(regex)[1].split(',').map(item => item.replace(/"/g, '')));
const classes = items[0].map((item, index) => ({
type: 'c',
value: item,
index,
}));
const teachers = items[1].map((item, index) => ({
type: 't',
value: item,
index,
}));
const rooms = items[2].map((item, index) => ({
type: 'r',
value: item,
index,
}));
const students = items[3].map((item, index) => ({
type: 's',
value: item,
index,
}));
return _.flatten([classes, teachers, rooms, students]);
}
function scrapeWeeks(html) {
const page = cheerio.load(html);
const weekSelector = page('select[name="week"]');
const weeks = _.map(weekSelector.children(), option => ({
id: cheerio(option).attr('value'),
text: cheerio(option).text(),
}));
return weeks;
}
function scrapeAltText(html) {
const page = cheerio.load(html);
return page('center > font').eq(2).text().trim();
}
function combineUsers(usersArrays) {
return _.uniqBy(_.flatten(usersArrays), user => `${user.type}/${user.value}`);
}
function getAlts(users) {
const requests = users.map(user =>
request(getUrlOfUser('dag', user.type, user.index, 7), { timeout: 8000, encoding: null }));
return Promise.all(requests).then(teacherResponses =>
teacherResponses.map((teacherResponse, index) => {
const teacherResponseBody = iconv.decode(teacherResponse.body, 'iso-8859-1');
const teacherName = scrapeAltText(teacherResponseBody);
return {
...users[index],
alt: teacherName,
};
}));
}
function getScheduleData() {
const navbarRequests = [
request('http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/frames/navbar.htm', { timeout: 5000 }),
request('http://www.meetingpointmco.nl/Roosters-AL/doc/basisroosters/frames/navbar.htm', { timeout: 5000 }),
];
return Promise.all(navbarRequests)
.then(([dailyScheduleResponse, basisScheduleResponse]) => {
const users = scrapeUsers(dailyScheduleResponse.body);
const dailyScheduleWeeks = scrapeWeeks(dailyScheduleResponse.body);
const basisScheduleWeeks = scrapeWeeks(basisScheduleResponse.body);
const teachers = users.filter(user => user.type === 't');
return getAlts(teachers)
.then(teachersWithAlts => ({
users: combineUsers([teachersWithAlts, users]),
dailyScheduleWeeks,
basisScheduleWeeks,
}))
.catch(() => ({
// Just return the user data without the alts if getAlts fails, since
// the alts are non-essential.
users,
dailyScheduleWeeks,
basisScheduleWeeks,
}));
});
}
function getScheduleDataCacheWrapper() {
if (meetingpointData == null || new Date() - lastUpdate > 30 * 60 * 1000) { // 30 minutes
return getScheduleData().then((meetingpointData_) => {
lastUpdate = new Date();
meetingpointData = meetingpointData_;
return meetingpointData;
});
}
return Promise.resolve(meetingpointData);
}
module.exports = debounce(getScheduleDataCacheWrapper);
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