<?php
  
  /**
   * This file is part of the Carbon package.
   *
   * (c) Brian Nesbitt <brian@nesbot.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  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))];
      }
  }