import { hooks } from '../utils/hooks'; import { createDate, createUTCDate } from './date-from-array'; import { daysInYear } from '../units/year'; import { weekOfYear, weeksInYear, dayOfYearFromWeeks } from '../units/week-calendar-utils'; import { YEAR, MONTH, DATE, HOUR, MINUTE, SECOND, MILLISECOND } from '../units/constants'; import { createLocal } from './local'; import defaults from '../utils/defaults'; import getParsingFlags from './parsing-flags';

function currentDateArray(config) {

// hooks is actually the exported moment object
var nowValue = new Date(hooks.now());
if (config._useUTC) {
    return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()];
}
return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];

}

// convert an array to a date. // the array should mirror the parameters below // note: all values past the year are optional and will default to the lowest possible value. // [year, month, day , hour, minute, second, millisecond] export function configFromArray (config) {

var i, date, input = [], currentDate, yearToUse;

if (config._d) {
    return;
}

currentDate = currentDateArray(config);

//compute day of the year from weeks and weekdays
if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
    dayOfYearFromWeekInfo(config);
}

//if the day of the year is set, figure out what it is
if (config._dayOfYear != null) {
    yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

    if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
        getParsingFlags(config)._overflowDayOfYear = true;
    }

    date = createUTCDate(yearToUse, 0, config._dayOfYear);
    config._a[MONTH] = date.getUTCMonth();
    config._a[DATE] = date.getUTCDate();
}

// Default to current date.
// * if no year, month, day of month are given, default to today
// * if day of month is given, default month and year
// * if month is given, default only year
// * if year is given, don't default anything
for (i = 0; i < 3 && config._a[i] == null; ++i) {
    config._a[i] = input[i] = currentDate[i];
}

// Zero out whatever was not defaulted, including time
for (; i < 7; i++) {
    config._a[i] = input[i] = (config._a[i] == null) ? (i === 2 ? 1 : 0) : config._a[i];
}

// Check for 24:00:00.000
if (config._a[HOUR] === 24 &&
        config._a[MINUTE] === 0 &&
        config._a[SECOND] === 0 &&
        config._a[MILLISECOND] === 0) {
    config._nextDay = true;
    config._a[HOUR] = 0;
}

config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input);
// Apply timezone offset from input. The actual utcOffset can be changed
// with parseZone.
if (config._tzm != null) {
    config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
}

if (config._nextDay) {
    config._a[HOUR] = 24;
}

}

function dayOfYearFromWeekInfo(config) {

var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow;

w = config._w;
if (w.GG != null || w.W != null || w.E != null) {
    dow = 1;
    doy = 4;

    // TODO: We need to take the current isoWeekYear, but that depends on
    // how we interpret now (local, utc, fixed offset). So create
    // a now version of current config (take local/utc/offset flags, and
    // create now).
    weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year);
    week = defaults(w.W, 1);
    weekday = defaults(w.E, 1);
    if (weekday < 1 || weekday > 7) {
        weekdayOverflow = true;
    }
} else {
    dow = config._locale._week.dow;
    doy = config._locale._week.doy;

    var curWeek = weekOfYear(createLocal(), dow, doy);

    weekYear = defaults(w.gg, config._a[YEAR], curWeek.year);

    // Default to current week.
    week = defaults(w.w, curWeek.week);

    if (w.d != null) {
        // weekday -- low day numbers are considered next week
        weekday = w.d;
        if (weekday < 0 || weekday > 6) {
            weekdayOverflow = true;
        }
    } else if (w.e != null) {
        // local weekday -- counting starts from begining of week
        weekday = w.e + dow;
        if (w.e < 0 || w.e > 6) {
            weekdayOverflow = true;
        }
    } else {
        // default to begining of week
        weekday = dow;
    }
}
if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
    getParsingFlags(config)._overflowWeeks = true;
} else if (weekdayOverflow != null) {
    getParsingFlags(config)._overflowWeekday = true;
} else {
    temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
    config._a[YEAR] = temp.year;
    config._dayOfYear = temp.dayOfYear;
}

}