<?php

namespace Carbon\Traits;

/**
 * Trait Timestamp.
 */
trait Timestamp
{
	/**
	 * Create a Carbon instance from a timestamp and set the timezone (use default one if not specified).
	 *
	 * Timestamp input can be given as int, float or a string containing one or more numbers.
	 *
	 * @param float|int|string          $timestamp
	 * @param \DateTimeZone|string|null $tz
	 *
	 * @return static
	 */
	public static function createFromTimestamp($timestamp, $tz = null)
	{
		return static::createFromTimestampUTC($timestamp)->setTimezone($tz);
	}


	/**
	 * Create a Carbon instance from an timestamp keeping the timezone to UTC.
	 *
	 * Timestamp input can be given as int, float or a string containing one or more numbers.
	 *
	 * @param float|int|string $timestamp
	 *
	 * @return static
	 */
	public static function createFromTimestampUTC($timestamp)
	{
		[$integer, $decimal] = self::getIntegerAndDecimalParts($timestamp);
		$delta = floor($decimal / static::MICROSECONDS_PER_SECOND);
		$integer += $delta;
		$decimal -= $delta * static::MICROSECONDS_PER_SECOND;
		$decimal = str_pad((string) $decimal, 6, '0', STR_PAD_LEFT);

		return static::rawCreateFromFormat('U u', "$integer $decimal");
	}


	/**
	 * Create a Carbon instance from a timestamp in milliseconds.
	 *
	 * Timestamp input can be given as int, float or a string containing one or more numbers.
	 *
	 * @param float|int|string $timestamp
	 *
	 * @return static
	 */
	public static function createFromTimestampMsUTC($timestamp)
	{
		[$milliseconds, $microseconds] = self::getIntegerAndDecimalParts($timestamp, 3);
		$sign = $milliseconds < 0 || ($milliseconds === 0.0 && $microseconds < 0) ? -1 : 1;
		$milliseconds = abs($milliseconds);
		$microseconds = $sign * abs($microseconds) + static::MICROSECONDS_PER_MILLISECOND * ($milliseconds % static::MILLISECONDS_PER_SECOND);
		$seconds = $sign * floor($milliseconds / static::MILLISECONDS_PER_SECOND);
		$delta = floor($microseconds / static::MICROSECONDS_PER_SECOND);
		$seconds += $delta;
		$microseconds -= $delta * static::MICROSECONDS_PER_SECOND;
		$microseconds = str_pad($microseconds, 6, '0', STR_PAD_LEFT);

		return static::rawCreateFromFormat('U u', "$seconds $microseconds");
	}


	/**
	 * Create a Carbon instance from a timestamp in milliseconds.
	 *
	 * Timestamp input can be given as int, float or a string containing one or more numbers.
	 *
	 * @param float|int|string          $timestamp
	 * @param \DateTimeZone|string|null $tz
	 *
	 * @return static
	 */
	public static function createFromTimestampMs($timestamp, $tz = null)
	{
		return static::createFromTimestampMsUTC($timestamp)
		    ->setTimezone($tz);
	}


	/**
	 * Set the instance's timestamp.
	 *
	 * Timestamp input can be given as int, float or a string containing one or more numbers.
	 *
	 * @param float|int|string $unixTimestamp
	 *
	 * @return static
	 */
	public function timestamp($unixTimestamp)
	{
		return $this->setTimestamp($unixTimestamp);
	}


	/**
	 * Returns a timestamp rounded with the given precision (6 by default).
	 *
	 * @example getPreciseTimestamp()   1532087464437474 (microsecond maximum precision)
	 * @example getPreciseTimestamp(6)  1532087464437474
	 * @example getPreciseTimestamp(5)  153208746443747  (1/100000 second precision)
	 * @example getPreciseTimestamp(4)  15320874644375   (1/10000 second precision)
	 * @example getPreciseTimestamp(3)  1532087464437    (millisecond precision)
	 * @example getPreciseTimestamp(2)  153208746444     (1/100 second precision)
	 * @example getPreciseTimestamp(1)  15320874644      (1/10 second precision)
	 * @example getPreciseTimestamp(0)  1532087464       (second precision)
	 * @example getPreciseTimestamp(-1) 153208746        (10 second precision)
	 * @example getPreciseTimestamp(-2) 15320875         (100 second precision)
	 *
	 * @param int $precision
	 *
	 * @return float
	 */
	public function getPreciseTimestamp($precision = 6)
	{
		return round(((float) $this->rawFormat('Uu')) / pow(10, 6 - $precision));
	}


	/**
	 * Returns the milliseconds timestamps used amongst other by Date javascript objects.
	 *
	 * @return float
	 */
	public function valueOf()
	{
		return $this->getPreciseTimestamp(3);
	}


	/**
	 * Returns the timestamp with millisecond precision.
	 *
	 * @return int
	 */
	public function getTimestampMs()
	{
		return (int) $this->getPreciseTimestamp(3);
	}


	/**
	 * @alias getTimestamp
	 *
	 * Returns the UNIX timestamp for the current date.
	 *
	 * @return int
	 */
	public function unix()
	{
		return $this->getTimestamp();
	}


	/**
	 * Return an array with integer part digits and decimals digits split from one or more positive numbers
	 * (such as timestamps) as string with the given number of decimals (6 by default).
	 *
	 * By splitting integer and decimal, this method obtain a better precision than
	 * number_format when the input is a string.
	 *
	 * @param float|int|string $numbers  one or more numbers
	 * @param int              $decimals number of decimals precision (6 by default)
	 *
	 * @return array 0-index is integer part, 1-index is decimal part digits
	 */
	private static function getIntegerAndDecimalParts($numbers, $decimals = 6)
	{
		if (\is_int($numbers) || \is_float($numbers)) {
		    $numbers = number_format($numbers, $decimals, '.', '');
		}

		$sign = str_starts_with($numbers, '-') ? -1 : 1;
		$integer = 0;
		$decimal = 0;

		foreach (preg_split('`[^\d.]+`', $numbers) as $chunk) {
		    [$integerPart, $decimalPart] = explode('.', "$chunk.");

		    $integer += (int) $integerPart;
		    $decimal += (float) ("0.$decimalPart");
		}

		$overflow = floor($decimal);
		$integer += $overflow;
		$decimal -= $overflow;

		return [$sign * $integer, $decimal === 0.0 ? 0.0 : $sign * round($decimal * pow(10, $decimals))];
	}
}
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