const leftPad = require('left-pad') // copied from http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/untisscripts.js, // were using the same code as they do to be sure that we always get the same // week number. function getWeek () { // Create a copy of this date object var target = new Date() // ISO week date weeks start on monday // so correct the day number var dayNr = (target.getDay() + 6) % 7 // ISO 8601 states that week 1 is the week // with the first thursday of that year. // Set the target date to the thursday in the target week target.setDate(target.getDate() - dayNr + 3) // Store the millisecond value of the target date var firstThursday = target.valueOf() // Set the target to the first thursday of the year // First set the target to january first target.setMonth(0, 1) // Not a thursday? Correct the date to the next thursday if (target.getDay() !== 4) { target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7) } // The weeknumber is the number of weeks between the // first thursday of the year and the thursday in the target week return 1 + Math.ceil((firstThursday - target) / 604800000) // 604800000 = 7 * 24 * 3600 * 1000 } function getURLOfUsers (weekOffset, type, id) { return `http://${window.location.host}/meetingpointProxy/Roosters-AL%2Fdoc%2Fdagroosters%2F` + `${getWeek() + weekOffset}%2F${type}%2F${type}${leftPad(id, 5, '0')}.htm` } module.exports = getURLOfUsers module.exports.CLASS = 'c' module.exports.TEACHERS = 't' module.exports.ROOMS = 'r' module.exports.STUDENTS = 's'