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<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;


/**
 * DateTime.
 */
class DateTime extends \DateTime implements \JsonSerializable
{
	use Nette\SmartObject;

	/** minute in seconds */
	public const MINUTE = 60;

	/** hour in seconds */
	public const HOUR = 60 * self::MINUTE;

	/** day in seconds */
	public const DAY = 24 * self::HOUR;

	/** week in seconds */
	public const WEEK = 7 * self::DAY;

	/** average month in seconds */
	public const MONTH = 2629800;

	/** average year in seconds */
	public const YEAR = 31557600;


	/**
	 * Creates a DateTime object from a string, UNIX timestamp, or other DateTimeInterface object.
	 * @param  string|int|\DateTimeInterface  $time
	 * @return static
	 * @throws \Exception if the date and time are not valid.
	 */
	public static function from($time)
	{
		if ($time instanceof \DateTimeInterface) {
			return new static($time->format('Y-m-d H:i:s.u'), $time->getTimezone());

		} elseif (is_numeric($time)) {
			if ($time <= self::YEAR) {
				$time += time();
			}

			return (new static('@' . $time))->setTimezone(new \DateTimeZone(date_default_timezone_get()));

		} else { // textual or null
			return new static((string) $time);
		}
	}


	/**
	 * Creates DateTime object.
	 * @return static
	 * @throws Nette\InvalidArgumentException if the date and time are not valid.
	 */
	public static function fromParts(
		int $year,
		int $month,
		int $day,
		int $hour = 0,
		int $minute = 0,
		float $second = 0.0
	) {
		$s = sprintf('%04d-%02d-%02d %02d:%02d:%02.5F', $year, $month, $day, $hour, $minute, $second);
		if (
			!checkdate($month, $day, $year)
			|| $hour < 0
			|| $hour > 23
			|| $minute < 0
			|| $minute > 59
			|| $second < 0
			|| $second >= 60
		) {
			throw new Nette\InvalidArgumentException("Invalid date '$s'");
		}

		return new static($s);
	}


	/**
	 * Returns new DateTime object formatted according to the specified format.
	 * @param  string  $format  The format the $time parameter should be in
	 * @param  string  $time
	 * @param  string|\DateTimeZone  $timezone (default timezone is used if null is passed)
	 * @return static|false
	 */
	#[\ReturnTypeWillChange]
	public static function createFromFormat($format, $time, $timezone = null)
	{
		if ($timezone === null) {
			$timezone = new \DateTimeZone(date_default_timezone_get());

		} elseif (is_string($timezone)) {
			$timezone = new \DateTimeZone($timezone);

		} elseif (!$timezone instanceof \DateTimeZone) {
			throw new Nette\InvalidArgumentException('Invalid timezone given');
		}

		$date = parent::createFromFormat($format, $time, $timezone);
		return $date ? static::from($date) : false;
	}


	/**
	 * Returns JSON representation in ISO 8601 (used by JavaScript).
	 */
	public function jsonSerialize(): string
	{
		return $this->format('c');
	}


	/**
	 * Returns the date and time in the format 'Y-m-d H:i:s'.
	 */
	public function __toString(): string
	{
		return $this->format('Y-m-d H:i:s');
	}


	/**
	 * Creates a copy with a modified time.
	 * @return static
	 */
	public function modifyClone(string $modify = '')
	{
		$dolly = clone $this;
		return $modify ? $dolly->modify($modify) : $dolly;
	}
}