<?php
/**
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @since         3.0.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\I18n;

use Carbon\Carbon;
use IntlDateFormatter;
use JsonSerializable;
use RuntimeException;

/**
 * Extends the built-in DateTime class to provide handy methods and locale-aware
 * formatting helpers
 *
 */
class Time extends Carbon implements JsonSerializable
{

    /**
     * The format to use when formatting a time using `Cake\I18n\Time::i18nFormat()`
     * and `__toString`
     *
     * The format should be either the formatting constants from IntlDateFormatter as
     * described in (http://www.php.net/manual/en/class.intldateformatter.php) or a pattern
     * as specified in (http://www.icu-project.org/apiref/icu4c/classSimpleDateFormat.html#details)
     *
     * It is possible to provide an array of 2 constants. In this case, the first position
     * will be used for formatting the date part of the object and the second position
     * will be used to format the time part.
     *
     * @var string|array|int
     * @see \Cake\I18n\Time::i18nFormat()
     */
    protected static $_toStringFormat = [IntlDateFormatter::SHORT, IntlDateFormatter::SHORT];

    /**
     * The format to use when when converting this object to json
     *
     * The format should be either the formatting constants from IntlDateFormatter as
     * described in (http://www.php.net/manual/en/class.intldateformatter.php) or a pattern
     * as specified in (http://www.icu-project.org/apiref/icu4c/classSimpleDateFormat.html#details)
     *
     * It is possible to provide an array of 2 constants. In this case, the first position
     * will be used for formatting the date part of the object and the second position
     * will be used to format the time part.
     *
     * @var string|array|int
     * @see \Cake\I18n\Time::i18nFormat()
     */
    protected static $_jsonEncodeFormat = "yyyy-MM-dd'T'HH:mm:ssZ";

    /**
     * The format to use when formatting a time using `Cake\I18n\Time::nice()`
     *
     * The format should be either the formatting constants from IntlDateFormatter as
     * described in (http://www.php.net/manual/en/class.intldateformatter.php) or a pattern
     * as specified in (http://www.icu-project.org/apiref/icu4c/classSimpleDateFormat.html#details)
     *
     * It is possible to provide an array of 2 constants. In this case, the first position
     * will be used for formatting the date part of the object and the second position
     * will be used to format the time part.
     *
     * @var string|array|int
     * @see \Cake\I18n\Time::nice()
     */
    public static $niceFormat = [IntlDateFormatter::MEDIUM, IntlDateFormatter::SHORT];

    /**
     * The default locale to be used for displaying formatted date strings.
     *
     * @var string
     */
    public static $defaultLocale;

    /**
     * The format to use when formatting a time using `Cake\I18n\Time::timeAgoInWords()`
     * and the difference is more than `Cake\I18n\Time::$wordEnd`
     *
     * @var string
     * @see \Cake\I18n\Time::timeAgoInWords()
     */
    public static $wordFormat = [IntlDateFormatter::SHORT, -1];

    /**
     * The format to use when formatting a time using `Time::timeAgoInWords()`
     * and the difference is less than `Time::$wordEnd`
     *
     * @var array
     * @see \Cake\I18n\Time::timeAgoInWords()
     */
    public static $wordAccuracy = [
        'year' => "day",
        'month' => "day",
        'week' => "day",
        'day' => "hour",
        'hour' => "minute",
        'minute' => "minute",
        'second' => "second",
    ];

    /**
     * The end of relative time telling
     *
     * @var string
     * @see \Cake\I18n\Time::timeAgoInWords()
     */
    public static $wordEnd = '+1 month';

    /**
     * In-memory cache of date formatters
     *
     * @var array
     */
    protected static $_formatters = [];

    /**
     * {@inheritDoc}
     */
    public function __construct($time = null, $tz = null)
    {
        if ($time instanceof \DateTime) {
            $tz = $time->getTimeZone();
            $time = $time->format('Y-m-d H:i:s');
        }

        if (is_numeric($time)) {
            $time = '@' . $time;
        }

        parent::__construct($time, $tz);
    }

    /**
     * Returns a nicely formatted date string for this object.
     *
     * The format to be used is stored in the static property `Time::niceFormat`.
     *
     * @param string|\DateTimeZone|null $timezone Timezone string or DateTimeZone object
     * in which the date will be displayed. The timezone stored for this object will not
     * be changed.
     * @param string|null $locale The locale name in which the date should be displayed (e.g. pt-BR)
     * @return string Formatted date string
     */
    public function nice($timezone = null, $locale = null)
    {
        return $this->i18nFormat(static::$niceFormat, $timezone, $locale);
    }

    /**
     * Returns true if this object represents a date within the current week
     *
     * @return bool
     */
    public function isThisWeek()
    {
        return static::now($this->getTimezone())->format('W o') == $this->format('W o');
    }

    /**
     * Returns true if this object represents a date within the current month
     *
     * @return bool
     */
    public function isThisMonth()
    {
        return static::now($this->getTimezone())->format('m Y') == $this->format('m Y');
    }

    /**
     * Returns true if this object represents a date within the current year
     *
     * @return bool
     */
    public function isThisYear()
    {
        return static::now($this->getTimezone())->format('Y') == $this->format('Y');
    }

    /**
     * Returns the quarter
     *
     * @param bool $range Range.
     * @return mixed 1, 2, 3, or 4 quarter of year or array if $range true
     */
    public function toQuarter($range = false)
    {
        $quarter = ceil($this->format('m') / 3);
        if ($range === false) {
            return $quarter;
        }

        $year = $this->format('Y');
        switch ($quarter) {
            case 1:
                return [$year . '-01-01', $year . '-03-31'];
            case 2:
                return [$year . '-04-01', $year . '-06-30'];
            case 3:
                return [$year . '-07-01', $year . '-09-30'];
            case 4:
                return [$year . '-10-01', $year . '-12-31'];
        }
    }

    /**
     * Returns a UNIX timestamp.
     *
     * @return string UNIX timestamp
     */
    public function toUnixString()
    {
        return $this->format('U');
    }

    /**
     * Returns either a relative or a formatted absolute date depending
     * on the difference between the current time and this object.
     *
     * ### Options:
     *
     * - `from` => another Time object representing the "now" time
     * - `format` => a fall back format if the relative time is longer than the duration specified by end
     * - `accuracy` => Specifies how accurate the date should be described (array)
     *    - year =>   The format if years > 0   (default "day")
     *    - month =>  The format if months > 0  (default "day")
     *    - week =>   The format if weeks > 0   (default "day")
     *    - day =>    The format if weeks > 0   (default "hour")
     *    - hour =>   The format if hours > 0   (default "minute")
     *    - minute => The format if minutes > 0 (default "minute")
     *    - second => The format if seconds > 0 (default "second")
     * - `end` => The end of relative time telling
     * - `relativeString` => The printf compatible string when outputting relative time
     * - `absoluteString` => The printf compatible string when outputting absolute time
     * - `timezone` => The user timezone the timestamp should be formatted in.
     *
     * Relative dates look something like this:
     *
     * - 3 weeks, 4 days ago
     * - 15 seconds ago
     *
     * Default date formatting is d/M/YY e.g: on 18/2/09. Formatting is done internally using
     * `i18nFormat`, see the method for the valid formatting strings
     *
     * The returned string includes 'ago' or 'on' and assumes you'll properly add a word
     * like 'Posted ' before the function output.
     *
     * NOTE: If the difference is one week or more, the lowest level of accuracy is day
     *
     * @param array $options Array of options.
     * @return string Relative time string.
     */
    public function timeAgoInWords(array $options = [])
    {
        $time = $this;

        $timezone = null;
        $format = static::$wordFormat;
        $end = static::$wordEnd;
        $relativeString = __d('cake', '%s ago');
        $absoluteString = __d('cake', 'on %s');
        $accuracy = static::$wordAccuracy;
        $from = static::now();
        $opts = ['timezone', 'format', 'end', 'relativeString', 'absoluteString', 'from'];

        foreach ($opts as $option) {
            if (isset($options[$option])) {
                ${$option} = $options[$option];
                unset($options[$option]);
            }
        }

        if (isset($options['accuracy'])) {
            if (is_array($options['accuracy'])) {
                $accuracy = $options['accuracy'] + $accuracy;
            } else {
                foreach ($accuracy as $key => $level) {
                    $accuracy[$key] = $options['accuracy'];
                }
            }
        }

        if ($timezone) {
            $time = clone $this;
            $time->timezone($timezone);
        }

        $now = $from->format('U');
        $inSeconds = $time->format('U');
        $backwards = ($inSeconds > $now);

        $futureTime = $now;
        $pastTime = $inSeconds;
        if ($backwards) {
            $futureTime = $inSeconds;
            $pastTime = $now;
        }
        $diff = $futureTime - $pastTime;

        if (!$diff) {
            return __d('cake', 'just now', 'just now');
        }

        if ($diff > abs($now - (new static($end))->format('U'))) {
            return sprintf($absoluteString, $time->i18nFormat($format));
        }

        // If more than a week, then take into account the length of months
        if ($diff >= 604800) {
            list($future['H'], $future['i'], $future['s'], $future['d'], $future['m'], $future['Y']) = explode('/', date('H/i/s/d/m/Y', $futureTime));

            list($past['H'], $past['i'], $past['s'], $past['d'], $past['m'], $past['Y']) = explode('/', date('H/i/s/d/m/Y', $pastTime));
            $weeks = $days = $hours = $minutes = $seconds = 0;

            $years = $future['Y'] - $past['Y'];
            $months = $future['m'] + ((12 * $years) - $past['m']);

            if ($months >= 12) {
                $years = floor($months / 12);
                $months = $months - ($years * 12);
            }
            if ($future['m'] < $past['m'] && $future['Y'] - $past['Y'] === 1) {
                $years--;
            }

            if ($future['d'] >= $past['d']) {
                $days = $future['d'] - $past['d'];
            } else {
                $daysInPastMonth = date('t', $pastTime);
                $daysInFutureMonth = date('t', mktime(0, 0, 0, $future['m'] - 1, 1, $future['Y']));

                if (!$backwards) {
                    $days = ($daysInPastMonth - $past['d']) + $future['d'];
                } else {
                    $days = ($daysInFutureMonth - $past['d']) + $future['d'];
                }

                if ($future['m'] != $past['m']) {
                    $months--;
                }
            }

            if (!$months && $years >= 1 && $diff < ($years * 31536000)) {
                $months = 11;
                $years--;
            }

            if ($months >= 12) {
                $years = $years + 1;
                $months = $months - 12;
            }

            if ($days >= 7) {
                $weeks = floor($days / 7);
                $days = $days - ($weeks * 7);
            }
        } else {
            $years = $months = $weeks = 0;
            $days = floor($diff / 86400);

            $diff = $diff - ($days * 86400);

            $hours = floor($diff / 3600);
            $diff = $diff - ($hours * 3600);

            $minutes = floor($diff / 60);
            $diff = $diff - ($minutes * 60);
            $seconds = $diff;
        }

        $fWord = $accuracy['second'];
        if ($years > 0) {
            $fWord = $accuracy['year'];
        } elseif (abs($months) > 0) {
            $fWord = $accuracy['month'];
        } elseif (abs($weeks) > 0) {
            $fWord = $accuracy['week'];
        } elseif (abs($days) > 0) {
            $fWord = $accuracy['day'];
        } elseif (abs($hours) > 0) {
            $fWord = $accuracy['hour'];
        } elseif (abs($minutes) > 0) {
            $fWord = $accuracy['minute'];
        }

        $fNum = str_replace(['year', 'month', 'week', 'day', 'hour', 'minute', 'second'], [1, 2, 3, 4, 5, 6, 7], $fWord);

        $relativeDate = '';
        if ($fNum >= 1 && $years > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} year', '{0} years', $years, $years);
        }
        if ($fNum >= 2 && $months > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} month', '{0} months', $months, $months);
        }
        if ($fNum >= 3 && $weeks > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} week', '{0} weeks', $weeks, $weeks);
        }
        if ($fNum >= 4 && $days > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} day', '{0} days', $days, $days);
        }
        if ($fNum >= 5 && $hours > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} hour', '{0} hours', $hours, $hours);
        }
        if ($fNum >= 6 && $minutes > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} minute', '{0} minutes', $minutes, $minutes);
        }
        if ($fNum >= 7 && $seconds > 0) {
            $relativeDate .= ($relativeDate ? ', ' : '') . __dn('cake', '{0} second', '{0} seconds', $seconds, $seconds);
        }

        // When time has passed
        if (!$backwards && $relativeDate) {
            return sprintf($relativeString, $relativeDate);
        }
        if (!$backwards) {
            $aboutAgo = [
                'second' => __d('cake', 'about a second ago'),
                'minute' => __d('cake', 'about a minute ago'),
                'hour' => __d('cake', 'about an hour ago'),
                'day' => __d('cake', 'about a day ago'),
                'week' => __d('cake', 'about a week ago'),
                'year' => __d('cake', 'about a year ago')
            ];

            return $aboutAgo[$fWord];
        }

        // When time is to come
        if (!$relativeDate) {
            $aboutIn = [
                'second' => __d('cake', 'in about a second'),
                'minute' => __d('cake', 'in about a minute'),
                'hour' => __d('cake', 'in about an hour'),
                'day' => __d('cake', 'in about a day'),
                'week' => __d('cake', 'in about a week'),
                'year' => __d('cake', 'in about a year')
            ];

            return $aboutIn[$fWord];
        }

        return $relativeDate;
    }

    /**
     * Returns the difference between this date and the provided one in a human
     * readable format.
     *
     * See `Time::timeAgoInWords()` for a full list of options that can be passed
     * to this method.
     *
     * @param \Carbon\Carbon|null $other the date to diff with
     * @param array $options options accepted by timeAgoInWords
     * @return string
     * @see Time::timeAgoInWords()
     */
    public function diffForHumans(Carbon $other = null, array $options = [])
    {
        $options = ['from' => $other] + $options;
        return $this->timeAgoInWords($options);
    }

    /**
     * Returns true this instance happened within the specified interval
     *
     * @param string|int $timeInterval the numeric value with space then time type.
     *    Example of valid types: 6 hours, 2 days, 1 minute.
     * @return bool
     */
    public function wasWithinLast($timeInterval)
    {
        $tmp = str_replace(' ', '', $timeInterval);
        if (is_numeric($tmp)) {
            $timeInterval = $tmp . ' days';
        }

        $interval = new static('-' . $timeInterval);
        $now = new static();

        return $this >= $interval && $this <= $now;
    }

    /**
     * Returns true this instance will happen within the specified interval
     *
     * @param string|int $timeInterval the numeric value with space then time type.
     *    Example of valid types: 6 hours, 2 days, 1 minute.
     * @return bool
     */
    public function isWithinNext($timeInterval)
    {
        $tmp = str_replace(' ', '', $timeInterval);
        if (is_numeric($tmp)) {
            $timeInterval = $tmp . ' days';
        }

        $interval = new static('+' . $timeInterval);
        $now = new static();

        return $this <= $interval && $this >= $now;
    }

    /**
     * Returns a formatted string for this time object using the preferred format and
     * language for the specified locale.
     *
     * It is possible to specify the desired format for the string to be displayed.
     * You can either pass `IntlDateFormatter` constants as the first argument of this
     * function, or pass a full ICU date formatting string as specified in the following
     * resource: http://www.icu-project.org/apiref/icu4c/classSimpleDateFormat.html#details.
     *
     * ### Examples
     *
     * ```
     * $time = new Time('2014-04-20 22:10');
     * $time->i18nFormat(); // outputs '4/20/14, 10:10 PM' for the en-US locale
     * $time->i18nFormat(\IntlDateFormatter::FULL); // Use the full date and time format
     * $time->i18nFormat([\IntlDateFormatter::FULL, \IntlDateFormatter::SHORT]); // Use full date but short time format
     * $time->i18nFormat('yyyy-MM-dd HH:mm:ss'); // outputs '2014-04-20 22:10'
     * ```
     *
     * If you wish to control the default format to be used for this method, you can alter
     * the value of the static `Time::$defaultLocale` variable and set it to one of the
     * possible formats accepted by this function.
     *
     * You can read about the available IntlDateFormatter constants at
     * http://www.php.net/manual/en/class.intldateformatter.php
     *
     * If you need to display the date in a different timezone than the one being used for
     * this Time object without altering its internal state, you can pass a timezone
     * string or object as the second parameter.
     *
     * Finally, should you need to use a different locale for displaying this time object,
     * pass a locale string as the third parameter to this function.
     *
     * ### Examples
     *
     * ```
     * $time = new Time('2014-04-20 22:10');
     * $time->i18nFormat(null, null, 'de-DE');
     * $time->i18nFormat(\IntlDateFormatter::FULL, 'Europe/Berlin', 'de-DE');
     * ```
     *
     * You can control the default locale to be used by setting the static variable
     * `Time::$defaultLocale` to a  valid locale string. If empty, the default will be
     * taken from the `intl.default_locale` ini config.
     *
     * @param string|int|null $format Format string.
     * @param string|\DateTimeZone|null $timezone Timezone string or DateTimeZone object
     * in which the date will be displayed. The timezone stored for this object will not
     * be changed.
     * @param string|null $locale The locale name in which the date should be displayed (e.g. pt-BR)
     * @return string Formatted and translated date string
     */
    public function i18nFormat($format = null, $timezone = null, $locale = null)
    {
        $time = $this;

        if ($timezone) {
            $time = clone $this;
            $time->timezone($timezone);
        }

        $format = $format !== null ? $format : static::$_toStringFormat;
        $locale = $locale ?: static::$defaultLocale;
        return $this->_formatObject($time, $format, $locale);
    }

    /**
     * Returns a translated and localized date string.
     * Implements what IntlDateFormatter::formatObject() is in PHP 5.5+
     *
     * @param \DateTime $date Date.
     * @param string|int|array $format Format.
     * @param string $locale The locale name in which the date should be displayed.
     * @return string
     */
    protected function _formatObject($date, $format, $locale)
    {
        $pattern = $dateFormat = $timeFormat = $calendar = null;

        if (is_array($format)) {
            list($dateFormat, $timeFormat) = $format;
        } elseif (is_numeric($format)) {
            $dateFormat = $format;
        } else {
            $dateFormat = $timeFormat = IntlDateFormatter::FULL;
            $pattern = $format;
        }

        if (preg_match('/@calendar=(japanese|buddhist|chinese|persian|indian|islamic|hebrew|coptic|ethiopic)/', $locale)) {
            $calendar = \IntlDateFormatter::TRADITIONAL;
        } else {
            $calendar = \IntlDateFormatter::GREGORIAN;
        }

        $timezone = $date->getTimezone()->getName();
        $key = "{$locale}.{$dateFormat}.{$timeFormat}.{$timezone}.{$calendar}.{$pattern}";

        if (!isset(static::$_formatters[$key])) {
            if ($timezone === '+00:00') {
                $timezone = 'UTC';
            } elseif ($timezone[0] === '+' || $timezone[0] === '-') {
                $timezone = 'GMT' . $timezone;
            }
            static::$_formatters[$key] = datefmt_create(
                $locale,
                $dateFormat,
                $timeFormat,
                $timezone,
                $calendar,
                $pattern
            );
        }

        return static::$_formatters[$key]->format($date);
    }

    /**
     * {@inheritDoc}
     */
    public function __toString()
    {
        return $this->i18nFormat();
    }

    /**
     * Get list of timezone identifiers
     *
     * @param int|string $filter A regex to filter identifier
     *   Or one of DateTimeZone class constants
     * @param string $country A two-letter ISO 3166-1 compatible country code.
     *   This option is only used when $filter is set to DateTimeZone::PER_COUNTRY
     * @param bool|array $options If true (default value) groups the identifiers list by primary region.
     *   Otherwise, an array containing `group`, `abbr`, `before`, and `after`
     *   keys. Setting `group` and `abbr` to true will group results and append
     *   timezone abbreviation in the display value. Set `before` and `after`
     *   to customize the abbreviation wrapper.
     * @return array List of timezone identifiers
     * @since 2.2
     */
    public static function listTimezones($filter = null, $country = null, $options = [])
    {
        if (is_bool($options)) {
            $options = [
                'group' => $options,
            ];
        }
        $defaults = [
            'group' => true,
            'abbr' => false,
            'before' => ' - ',
            'after' => null,
        ];
        $options += $defaults;
        $group = $options['group'];

        $regex = null;
        if (is_string($filter)) {
            $regex = $filter;
            $filter = null;
        }
        if ($filter === null) {
            $filter = \DateTimeZone::ALL;
        }
        $identifiers = \DateTimeZone::listIdentifiers($filter, $country);

        if ($regex) {
            foreach ($identifiers as $key => $tz) {
                if (!preg_match($regex, $tz)) {
                    unset($identifiers[$key]);
                }
            }
        }

        if ($group) {
            $groupedIdentifiers = [];
            $now = time();
            $before = $options['before'];
            $after = $options['after'];
            foreach ($identifiers as $key => $tz) {
                $abbr = null;
                if ($options['abbr']) {
                    $dateTimeZone = new \DateTimeZone($tz);
                    $trans = $dateTimeZone->getTransitions($now, $now);
                    $abbr = isset($trans[0]['abbr']) ?
                        $before . $trans[0]['abbr'] . $after :
                        null;
                }
                $item = explode('/', $tz, 2);
                if (isset($item[1])) {
                    $groupedIdentifiers[$item[0]][$tz] = $item[1] . $abbr;
                } else {
                    $groupedIdentifiers[$item[0]] = [$tz => $item[0] . $abbr];
                }
            }
            return $groupedIdentifiers;
        }
        return array_combine($identifiers, $identifiers);
    }

    /**
     * Resets the format used to the default when converting an instance of this type to
     * a string
     *
     * @return void
     */
    public static function resetToStringFormat()
    {
        static::setToStringFormat([IntlDateFormatter::SHORT, IntlDateFormatter::SHORT]);
    }

    /**
     * Sets the default format used when type converting instances of this type to string
     *
     * @param string|array|int $format Format.
     * @return void
     */
    public static function setToStringFormat($format)
    {
        static::$_toStringFormat = $format;
    }

    /**
     * Sets the default format used when converting this object to json
     *
     * @param string|array|int $format Format.
     * @return void
     */
    public static function setJsonEncodeFormat($format)
    {
        static::$_jsonEncodeFormat = $format;
    }

    /**
     * Returns a new Time object after parsing the provided time string based on
     * the passed or configured date time format. This method is locale dependent,
     * Any string that is passed to this function will be interpreted as a locale
     * dependent string.
     *
     * When no $format is provided, the `toString` format will be used.
     *
     * If it was impossible to parse the provided time, null will be returned.
     *
     * Example:
     *
     * ```
     *  $time = Time::parseDateTime('10/13/2013 12:54am');
     *  $time = Time::parseDateTime('13 Oct, 2013 13:54', 'dd MMM, y H:mm');
     *  $time = Time::parseDateTime('10/10/2015', [IntlDateFormatter::SHORT, -1]);
     * ```
     *
     * @param string $time The time string to parse.
     * @param string|array $format Any format accepted by IntlDateFormatter.
     * @return static|null
     */
    public static function parseDateTime($time, $format = null)
    {
        $dateFormat = $format ?: static::$_toStringFormat;
        $timeFormat = $pattern = null;

        if (is_array($dateFormat)) {
            list($newDateFormat, $timeFormat) = $dateFormat;
            $dateFormat = $newDateFormat;
        } else {
            $pattern = $dateFormat;
            $dateFormat = null;
        }

        $formatter = datefmt_create(
            static::$defaultLocale,
            $dateFormat,
            $timeFormat,
            date_default_timezone_get(),
            null,
            $pattern
        );
        $time = $formatter->parse($time);
        if ($time) {
            $result = new static('@' . $time);
            $result->setTimezone(date_default_timezone_get());
            return $result;
        }
        return null;
    }

    /**
     * Returns a new Time object after parsing the provided $date string based on
     * the passed or configured date time format. This method is locale dependent,
     * Any string that is passed to this function will be interpreted as a locale
     * dependent string.
     *
     * When no $format is provided, the `wordFormat` format will be used.
     *
     * If it was impossible to parse the provided time, null will be returned.
     *
     * Example:
     *
     * ```
     *  $time = Time::parseDate('10/13/2013');
     *  $time = Time::parseDate('13 Oct, 2013', 'dd MMM, y');
     *  $time = Time::parseDate('13 Oct, 2013', IntlDateFormatter::SHORT);
     * ```
     *
     * @param string $date The date string to parse.
     * @param string|int $format Any format accepted by IntlDateFormatter.
     * @return static|null
     */
    public static function parseDate($date, $format = null)
    {
        if (is_int($format)) {
            $format = [$format, -1];
        }
        $format = $format ?: static::$wordFormat;
        return static::parseDateTime($date, $format);
    }

    /**
     * Returns a new Time object after parsing the provided $time string based on
     * the passed or configured date time format. This method is locale dependent,
     * Any string that is passed to this function will be interpreted as a locale
     * dependent string.
     *
     * When no $format is provided, the IntlDateFormatter::SHORT format will be used.
     *
     * If it was impossible to parse the provided time, null will be returned.
     *
     * Example:
     *
     * ```
     *  $time = Time::parseDate('11:23pm');
     * ```
     *
     * @param string $time The time string to parse.
     * @param string|int $format Any format accepted by IntlDateFormatter.
     * @return static|null
     */
    public static function parseTime($time, $format = null)
    {
        if (is_int($format)) {
            $format = [-1, $format];
        }
        $format = $format ?: [-1, IntlDateFormatter::SHORT];
        return static::parseDateTime($time, $format);
    }

    /**
     * Convenience method for getting the remaining time from a given time.
     *
     * @param DateTime $datetime The date to get the remaining time from.
     * @return DateInterval|bool The DateInterval object representing the difference between the two dates or FALSE on failure.
     */
    public static function fromNow($datetime)
    {
        $timeNow = new Time();
        return $timeNow->diff($datetime);
    }

    /**
     * Returns a string that should be serialized when converting this object to json
     *
     * @return string
     */
    public function jsonSerialize()
    {
        return $this->i18nFormat(static::$_jsonEncodeFormat);
    }

    /**
     * Returns the data that should be displayed when debugging this object
     *
     * @return array
     */
    public function __debugInfo()
    {
        return [
            'time' => $this->format(static::ISO8601),
            'timezone' => $this->getTimezone()->getName(),
            'fixedNowTime' => $this->hasTestNow() ? $this->getTestNow()->format(static::ISO8601) : false
        ];
    }
}
