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+import dateUtil from 'element-ui/src/utils/date';
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+import { t } from 'element-ui/src/locale';
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+
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+const weeks = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];
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+const months = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
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+const getI18nSettings = () => {
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+ return {
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+ dayNamesShort: weeks.map(week => t(`el.datepicker.weeks.${week}`)),
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+ dayNames: weeks.map(week => t(`el.datepicker.weeks.${week}`)),
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+ monthNamesShort: months.map(month => t(`el.datepicker.months.${month}`)),
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+ monthNames: months.map((month, index) => t(`el.datepicker.month${index + 1}`)),
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+ amPm: ['am', 'pm']
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+ };
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+};
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+
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+const newArray = function (start, end) {
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+ let result = [];
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+ for (let i = start; i <= end; i++) {
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+ result.push(i);
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+ }
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+ return result;
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+};
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+
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+export const toDate = function (date) {
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+ return isDate(date) ? new Date(date) : null;
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+};
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+
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+export const isDate = function (date) {
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+ if (date === null || date === undefined) return false;
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+ if (isNaN(new Date(date).getTime())) return false;
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+ if (Array.isArray(date)) return false; // deal with `new Date([ new Date() ]) -> new Date()`
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+ return true;
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+};
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+
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+export const isDateObject = function (val) {
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+ return val instanceof Date;
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+};
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+
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+export const formatDate = function (date, format) {
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+ date = toDate(date);
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+ if (!date) return '';
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+ return dateUtil.format(date, format || 'yyyy-MM-dd', getI18nSettings());
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+};
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+
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+export const parseDate = function (string, format) {
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+ return dateUtil.parse(string, format || 'yyyy-MM-dd', getI18nSettings());
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+};
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+
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+export const getDayCountOfMonth = function (year, month) {
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+ if (month === 3 || month === 5 || month === 8 || month === 10) {
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+ return 30;
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+ }
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+
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+ if (month === 1) {
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+ if (year % 4 === 0 && year % 100 !== 0 || year % 400 === 0) {
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+ return 29;
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+ } else {
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+ return 28;
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+ }
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+ }
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+
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+ return 31;
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+};
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+
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+export const getDayCountOfYear = function (year) {
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+ const isLeapYear = year % 400 === 0 || (year % 100 !== 0 && year % 4 === 0);
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+ return isLeapYear ? 366 : 365;
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+};
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+
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+export const getFirstDayOfMonth = function (date) {
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+ const temp = new Date(date.getTime());
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+ temp.setDate(1);
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+ return temp.getDay();
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+};
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+
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+// see: https://stackoverflow.com/questions/3674539/incrementing-a-date-in-javascript
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+// {prev, next} Date should work for Daylight Saving Time
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+// Adding 24 * 60 * 60 * 1000 does not work in the above scenario
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+export const prevDate = function (date, amount = 1) {
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+ return new Date(date.getFullYear(), date.getMonth(), date.getDate() - amount);
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+};
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+
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+export const nextDate = function (date, amount = 1) {
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+ return new Date(date.getFullYear(), date.getMonth(), date.getDate() + amount);
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+};
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+
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+export const getStartDateOfMonth = function (year, month) {
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+ const result = new Date(year, month, 1);
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+ const day = result.getDay();
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+
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+ if (day === 0) {
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+ return prevDate(result, 7);
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+ } else {
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+ return prevDate(result, day);
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+ }
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+};
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+
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+export const getWeekNumber = function (src) {
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+ if (!isDate(src)) return null;
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+ const date = new Date(src.getTime());
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+ date.setHours(0, 0, 0, 0);
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+ // Thursday in current week decides the year.
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+ date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
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+ // January 4 is always in week 1.
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+ const week1 = new Date(date.getFullYear(), 0, 4);
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+ // Adjust to Thursday in week 1 and count number of weeks from date to week 1.
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+ // Rounding should be fine for Daylight Saving Time. Its shift should never be more than 12 hours.
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+ return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
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+};
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+
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+export const getRangeHours = function (ranges) {
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+ const hours = [];
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+ let disabledHours = [];
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+
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+ (ranges || []).forEach(range => {
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+ const value = range.map(date => date.getHours());
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+
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+ disabledHours = disabledHours.concat(newArray(value[0], value[1]));
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+ });
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+
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+ if (disabledHours.length) {
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+ for (let i = 0; i < 24; i++) {
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+ hours[i] = disabledHours.indexOf(i) === -1;
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+ }
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+ } else {
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+ for (let i = 0; i < 24; i++) {
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+ hours[i] = false;
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+ }
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+ }
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+
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+ return hours;
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+};
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+
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+export const range = function (n) {
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+ // see https://stackoverflow.com/questions/3746725/create-a-javascript-array-containing-1-n
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+ return Array.apply(null, { length: n }).map((_, n) => n);
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+};
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+
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+export const modifyDate = function (date, y, m, d) {
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+ return new Date(y, m, d, date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds());
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+};
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+
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+export const modifyTime = function (date, h, m, s) {
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+ return new Date(date.getFullYear(), date.getMonth(), date.getDate(), h, m, s, date.getMilliseconds());
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+};
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+
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+export const modifyWithTimeString = (date, time) => {
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+ if (date == null || !time) {
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+ return date;
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+ }
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+ time = parseDate(time, 'HH:mm:ss');
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+ return modifyTime(date, time.getHours(), time.getMinutes(), time.getSeconds());
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+};
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+
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+export const clearTime = function (date) {
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+ return new Date(date.getFullYear(), date.getMonth(), date.getDate());
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+};
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+
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+export const clearMilliseconds = function (date) {
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+ return new Date(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), 0);
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+};
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+
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+export const limitTimeRange = function (date, ranges, format = 'HH:mm:ss') {
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+ // TODO: refactory a more elegant solution
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+ if (ranges.length === 0) return date;
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+ const normalizeDate = date => dateUtil.parse(dateUtil.format(date, format), format);
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+ const ndate = normalizeDate(date);
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+ const nranges = ranges.map(range => range.map(normalizeDate));
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+ if (nranges.some(nrange => ndate >= nrange[0] && ndate <= nrange[1])) return date;
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+
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+ let minDate = nranges[0][0];
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+ let maxDate = nranges[0][0];
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+
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+ nranges.forEach(nrange => {
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+ minDate = new Date(Math.min(nrange[0], minDate));
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+ maxDate = new Date(Math.max(nrange[1], minDate));
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+ });
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+
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+ const ret = ndate < minDate ? minDate : maxDate;
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+ // preserve Year/Month/Date
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+ return modifyDate(
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+ ret,
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+ date.getFullYear(),
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+ date.getMonth(),
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+ date.getDate()
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+ );
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+};
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+
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+export const timeWithinRange = function (date, selectableRange, format) {
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+ const limitedDate = limitTimeRange(date, selectableRange, format);
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+ return limitedDate.getTime() === date.getTime();
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+};
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+
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+export const changeYearMonthAndClampDate = function (date, year, month) {
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+ // clamp date to the number of days in `year`, `month`
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+ // eg: (2010-1-31, 2010, 2) => 2010-2-28
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+ const monthDate = Math.min(date.getDate(), getDayCountOfMonth(year, month));
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+ return modifyDate(date, year, month, monthDate);
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+};
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+
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+export const prevMonth = function (date) {
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+ const year = date.getFullYear();
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+ const month = date.getMonth();
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+ return month === 0
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+ ? changeYearMonthAndClampDate(date, year - 1, 11)
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+ : changeYearMonthAndClampDate(date, year, month - 1);
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+};
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+
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+export const nextMonth = function (date) {
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+ const year = date.getFullYear();
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+ const month = date.getMonth();
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+ return month === 11
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+ ? changeYearMonthAndClampDate(date, year + 1, 0)
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+ : changeYearMonthAndClampDate(date, year, month + 1);
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+};
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+
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+export const prevYear = function (date, amount = 1) {
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+ const year = date.getFullYear();
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+ const month = date.getMonth();
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+ return changeYearMonthAndClampDate(date, year - amount, month);
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+};
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+
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+export const nextYear = function (date, amount = 1) {
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+ const year = date.getFullYear();
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+ const month = date.getMonth();
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+ return changeYearMonthAndClampDate(date, year + amount, month);
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+};
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+
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+export const extractDateFormat = function (format) {
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+ return format
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+ .replace(/\W?m{1,2}|\W?ZZ/g, '')
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+ .replace(/\W?h{1,2}|\W?s{1,3}|\W?a/gi, '')
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+ .trim();
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+};
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+
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+export const extractTimeFormat = function (format) {
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+ return format
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+ .replace(/\W?D{1,2}|\W?Do|\W?d{1,4}|\W?M{1,4}|\W?y{2,4}/g, '')
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+ .trim();
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+};
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