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const EventEmitter = require('events')
const self = new EventEmitter()
self._nodes = {
prevButton: document.querySelectorAll('#week-selector button')[0],
nextButton: document.querySelectorAll('#week-selector button')[1],
currentWeekText: document.querySelector('#week-selector .current')
}
self._weekOffset = 0
// 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.
self.getCurrentWeek = function (target) {
const dayNr = (target.getDay() + 6) % 7
target.setDate(target.getDate() - dayNr + 3)
const firstThursday = target.valueOf()
target.setMonth(0, 1)
if (target.getDay() !== 4) {
target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7)
}
return 1 + Math.ceil((firstThursday - target) / 604800000)
}
self.getSelectedWeek = function () {
const now = new Date()
const targetDate = new Date(now.getTime() + self._weekOffset * 604800 * 1000)
return self.getCurrentWeek(targetDate)
}
self.updateCurrentWeek = function () {
const selectedWeekNumber = self.getSelectedWeek()
self._nodes.currentWeekText.textContent = `Week ${selectedWeekNumber}`
if (self.getCurrentWeek(new Date()) !== selectedWeekNumber) {
self._nodes.currentWeekText.classList.add('changed')
} else {
self._nodes.currentWeekText.classList.remove('changed')
}
self.emit('weekChanged', selectedWeekNumber)
}
self._handlePrevButtonClick = function () {
self._weekOffset -= 1
self.updateCurrentWeek()
}
self._handleNextButtonClick = function () {
self._weekOffset += 1
self.updateCurrentWeek()
}
self._nodes.prevButton.addEventListener('click', self._handlePrevButtonClick)
self._nodes.nextButton.addEventListener('click', self._handleNextButtonClick)
module.exports = self
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