<?php

/**
 * @file
 * TeamSpeak 3 PHP Framework
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * @package   TeamSpeak3
 * @author    Sven 'ScP' Paulsen
 * @copyright Copyright (c) Planet TeamSpeak. All rights reserved.
 */

/**
 * @class TeamSpeak3_Helper_Profiler_Timer
 * @brief Helper class providing profiler timers.
 */
class TeamSpeak3_Helper_Profiler_Timer
{
  /**
   * Indicates wether the timer is running or not.
   *
   * @var boolean
   */
  protected $running = FALSE;

  /**
   * Stores the timestamp when the timer was last started.
   *
   * @var integer
   */
  protected $started = 0;

  /**
   * Stores the timer name.
   *
   * @var string
   */
  protected $name = null;

  /**
   * Stores various information about the server environment.
   *
   * @var array
   */
  protected $data = array();

  /**
   * The TeamSpeak3_Helper_Profiler_Timer constructor.
   *
   * @param  string $name
   * @return TeamSpeak3_Helper_Profiler_Timer
   */
  public function __construct($name)
  {
    $this->name = (string) $name;

    $this->data["runtime"] = 0;
    $this->data["realmem"] = 0;
    $this->data["emalloc"] = 0;

    $this->start();
  }

  /**
   * Starts the timer.
   *
   * @return void
   */
  public function start()
  {
    if($this->isRunning()) return;

    $this->data["realmem_start"] = memory_get_usage(TRUE);
    $this->data["emalloc_start"] = memory_get_usage();

    $this->started = microtime(TRUE);
    $this->running = TRUE;
  }

  /**
   * Stops the timer.
   *
   * @return void
   */
  public function stop()
  {
    if(!$this->isRunning()) return;

    $this->data["runtime"] += microtime(TRUE) - $this->started;
    $this->data["realmem"] += memory_get_usage(TRUE) - $this->data["realmem_start"];
    $this->data["emalloc"] += memory_get_usage() - $this->data["emalloc_start"];

    $this->started = 0;
    $this->running = FALSE;
  }

  /**
   * Return the timer runtime.
   *
   * @return mixed
   */
  public function getRuntime()
  {
    if($this->isRunning())
    {
      $this->stop();
      $this->start();
    }

    return $this->data["runtime"];
  }

  /**
   * Returns the amount of memory allocated to PHP in bytes.
   *
   * @param  boolean $realmem
   * @return integer
   */
  public function getMemUsage($realmem = FALSE)
  {
    if($this->isRunning())
    {
      $this->stop();
      $this->start();
    }

    return ($realmem !== FALSE) ? $this->data["realmem"] : $this->data["emalloc"];
  }

  /**
   * Returns TRUE if the timer is running.
   *
   * @return boolean
   */
  public function isRunning()
  {
    return $this->running;
  }
}
