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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* DateKeeper keeps track of the date states.
*
* @param {Object} date parts
* {
* {Number} year
* {Number} month
* {Number} date
* }
* {Object} options
* {
* {Number} firstDayOfWeek [optional]
* {Array<Number>} weekends [optional]
* {Number} calViewSize [optional]
* }
*/
function DateKeeper({ year, month, date }, { firstDayOfWeek = 0, weekends = [0], calViewSize = 42 }) {
this.state = {
firstDayOfWeek, weekends, calViewSize,
dateObj: new Date(0),
years: [],
months: [],
days: []
};
this.state.weekHeaders = this._getWeekHeaders(firstDayOfWeek);
this._update(year, month, date);
}
{
const DAYS_IN_A_WEEK = 7,
MONTHS_IN_A_YEAR = 12,
YEAR_VIEW_SIZE = 200,
YEAR_BUFFER_SIZE = 10;
DateKeeper.prototype = {
/**
* Set new date
* @param {Object} date parts
* {
* {Number} year [optional]
* {Number} month [optional]
* {Number} date [optional]
* }
*/
set({ year = this.state.year, month = this.state.month, date = this.state.date }) {
this._update(year, month, date);
},
/**
* Set date with value
* @param {Number} value: Date value
*/
setValue(value) {
const dateObj = new Date(value);
this._update(dateObj.getUTCFullYear(), dateObj.getUTCMonth(), dateObj.getUTCDate());
},
/**
* Set month. Makes sure the date is <= the last day of the month
* @param {Number} month
*/
setMonth(month) {
const lastDayOfMonth = this._newUTCDate(this.state.year, month + 1, 0).getUTCDate();
this._update(this.state.year, month, Math.min(this.state.date, lastDayOfMonth));
},
/**
* Set year. Makes sure the date is <= the last day of the month
* @param {Number} year
*/
setYear(year) {
const lastDayOfMonth = this._newUTCDate(year, this.state.month + 1, 0).getUTCDate();
this._update(year, this.state.month, Math.min(this.state.date, lastDayOfMonth));
},
/**
* Set month by offset. Makes sure the date is <= the last day of the month
* @param {Number} offset
*/
setMonthByOffset(offset) {
const lastDayOfMonth = this._newUTCDate(this.state.year, this.state.month + offset + 1, 0).getUTCDate();
this._update(this.state.year, this.state.month + offset, Math.min(this.state.date, lastDayOfMonth));
},
/**
* Update the states.
* @param {Number} year [description]
* @param {Number} month [description]
* @param {Number} date [description]
*/
_update(year, month, date) {
// Use setUTCFullYear so that year 99 doesn't get parsed as 1999
this.state.dateObj.setUTCFullYear(year, month, date);
this.state.year = this.state.dateObj.getUTCFullYear();
this.state.month = this.state.dateObj.getUTCMonth();
this.state.date = this.state.dateObj.getUTCDate();
},
/**
* Generate the array of months
* @return {Array<Object>}
* {
* {Number} value: Month in int
* {Boolean} enabled
* }
*/
getMonths() {
// TODO: add min/max and step support
let months = [];
for (let i = 0; i < MONTHS_IN_A_YEAR; i++) {
months.push({
value: i,
enabled: true
});
}
return months;
},
/**
* Generate the array of years
* @return {Array<Object>}
* {
* {Number} value: Year in int
* {Boolean} enabled
* }
*/
getYears() {
// TODO: add min/max and step support
let years = [];
const firstItem = this.state.years[0];
const lastItem = this.state.years[this.state.years.length - 1];
const currentYear = this.state.dateObj.getUTCFullYear();
// Generate new years array when the year is outside of the first &
// last item range. If not, return the cached result.
if (!firstItem || !lastItem ||
currentYear <= firstItem.value + YEAR_BUFFER_SIZE ||
currentYear >= lastItem.value - YEAR_BUFFER_SIZE) {
// The year is set in the middle with items on both directions
for (let i = -(YEAR_VIEW_SIZE / 2); i < YEAR_VIEW_SIZE / 2; i++) {
years.push({
value: currentYear + i,
enabled: true
});
}
this.state.years = years;
}
return this.state.years;
},
/**
* Get days for calendar
* @return {Array<Object>}
* {
* {Number} dateValue
* {Number} textContent
* {Array<String>} classNames
* }
*/
getDays() {
// TODO: add min/max and step support
let firstDayOfMonth = this._getFirstCalendarDate(this.state.dateObj, this.state.firstDayOfWeek);
let days = [];
let month = this.state.dateObj.getUTCMonth();
for (let i = 0; i < this.state.calViewSize; i++) {
let dateObj = this._newUTCDate(firstDayOfMonth.getUTCFullYear(), firstDayOfMonth.getUTCMonth(), firstDayOfMonth.getUTCDate() + i);
let classNames = [];
if (this.state.weekends.includes(dateObj.getUTCDay())) {
classNames.push("weekend");
}
if (month != dateObj.getUTCMonth()) {
classNames.push("outside");
}
days.push({
dateValue: dateObj.getTime(),
textContent: dateObj.getUTCDate(),
classNames
});
}
return days;
},
/**
* Get week headers for calendar
* @param {Number} firstDayOfWeek
* @return {Array<Object>}
* {
* {Number} textContent
* {Array<String>} classNames
* }
*/
_getWeekHeaders(firstDayOfWeek) {
let headers = [];
let day = firstDayOfWeek;
for (let i = 0; i < DAYS_IN_A_WEEK; i++) {
headers.push({
textContent: day % DAYS_IN_A_WEEK,
classNames: this.state.weekends.includes(day % DAYS_IN_A_WEEK) ? ["weekend"] : []
});
day++;
}
return headers;
},
/**
* Get the first day on a calendar month
* @param {Date} dateObj
* @param {Number} firstDayOfWeek
* @return {Date}
*/
_getFirstCalendarDate(dateObj, firstDayOfWeek) {
const daysOffset = 1 - DAYS_IN_A_WEEK;
let firstDayOfMonth = this._newUTCDate(dateObj.getUTCFullYear(), dateObj.getUTCMonth());
let dayOfWeek = firstDayOfMonth.getUTCDay();
return this._newUTCDate(
firstDayOfMonth.getUTCFullYear(),
firstDayOfMonth.getUTCMonth(),
// When first calendar date is the same as first day of the week, add
// another row on top of it.
firstDayOfWeek == dayOfWeek ? daysOffset : (firstDayOfWeek - dayOfWeek + daysOffset) % DAYS_IN_A_WEEK);
},
/**
* Helper function for creating UTC dates
* @param {...[Number]} parts
* @return {Date}
*/
_newUTCDate(...parts) {
return new Date(Date.UTC(...parts));
}
};
}
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