<?php

/********************************************************************************\
 * Copyright (C) Carl Taylor (cjtaylor@adepteo.com)                             *
 * Copyright (C) Torben Nehmer (torben@nehmer.net) for Code Cleanup             *
 *                                                                              *
 * 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 2               *
 * 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, write to the Free Software                  *
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.  *
 \********************************************************************************/

// / Enable multiple timers to aid profiling of performance over sections of code
class Profiler
{

    var $description;

    var $startTime;

    var $endTime;

    var $initTime;

    var $cur_timer;

    var $stack;

    var $trail;

    var $trace;

    var $count;

    var $running;

    /**
     * Initialise the timer.
     * with the current micro time
     */
    function Profiler($output_enabled = false, $trace_enabled = false)
    {
        $this->description = array();
        $this->startTime = array();
        $this->endTime = array();
        $this->initTime = 0;
        $this->cur_timer = "";
        $this->stack = array();
        $this->trail = "";
        $this->trace = "";
        $this->count = array();
        $this->running = array();
        $this->initTime = $this->getMicroTime();
        $this->output_enabled = $output_enabled;
        $this->trace_enabled = $trace_enabled;
        $this->startTimer('unprofiled');
    }
    
    // Public Methods
    
    /**
     * Start an individual timer
     * This will pause the running timer and place it on a stack.
     *
     * @param string $name
     *            name of the timer
     * @param
     *            string optional $desc description of the timer
     */
    function startTimer($name, $desc = "")
    {
        $this->trace .= "start   $name\n";
        $n = array_push($this->stack, $this->cur_timer);
        $this->__suspendTimer($this->stack[$n - 1]);
        $this->startTime[$name] = $this->getMicroTime();
        $this->cur_timer = $name;
        $this->description[$name] = $desc;
        if (! array_key_exists($name, $this->count))
            $this->count[$name] = 1;
        else
            $this->count[$name] ++;
    }

    /**
     * Stop an individual timer
     * Restart the timer that was running before this one
     *
     * @param string $name
     *            name of the timer
     */
    function stopTimer($name)
    {
        $this->trace .= "stop    $name\n";
        $this->endTime[$name] = $this->getMicroTime();
        if (! array_key_exists($name, $this->running))
            $this->running[$name] = $this->elapsedTime($name);
        else
            $this->running[$name] += $this->elapsedTime($name);
        $this->cur_timer = array_pop($this->stack);
        $this->__resumeTimer($this->cur_timer);
    }

    /**
     * measure the elapsed time of a timer without stoping the timer if
     * it is still running
     */
    function elapsedTime($name)
    {
        // This shouldn't happen, but it does once.
        if (! array_key_exists($name, $this->startTime))
            return 0;
        
        if (array_key_exists($name, $this->endTime)) {
            return ($this->endTime[$name] - $this->startTime[$name]);
        } else {
            $now = $this->getMicroTime();
            return ($now - $this->startTime[$name]);
        }
    }
    // end start_time
    
    /**
     * Measure the elapsed time since the profile class was initialised
     */
    function elapsedOverall()
    {
        $oaTime = $this->getMicroTime() - $this->initTime;
        return ($oaTime);
    }
    // end start_time
    
    /**
     * print out a log of all the timers that were registered
     */
    function printTimers($enabled = false)
    {
        if ($this->output_enabled || $enabled) {
            $TimedTotal = 0;
            $tot_perc = 0;
            ksort($this->description);
            print("<pre style='position: absolute; top: 580px; color: #FFFFFF;'>\n");
            $oaTime = $this->getMicroTime() - $this->initTime;
            echo "============================================================================\n";
            echo "                              PROFILER OUTPUT\n";
            echo "============================================================================\n";
            print("Calls                    Time  Routine\n");
            echo "-----------------------------------------------------------------------------\n";
            while (list ($key, $val) = each($this->description)) {
                $t = $this->elapsedTime($key);
                $total = $this->running[$key];
                $count = $this->count[$key];
                $TimedTotal += $total;
                $perc = ($total / $oaTime) * 100;
                $tot_perc += $perc;
                // $perc=sprintf("%3.2f", $perc );
                printf("%3d    %3.4f ms (%3.2f %%)  %s\n", $count, $total * 1000, $perc, $key);
            }
            
            echo "\n";
            
            $missed = $oaTime - $TimedTotal;
            $perc = ($missed / $oaTime) * 100;
            $tot_perc += $perc;
            // $perc=sprintf("%3.2f", $perc );
            printf("       %3.4f ms (%3.2f %%)  %s\n", $missed * 1000, $perc, "Missed");
            
            echo "============================================================================\n";
            
            printf("       %3.4f ms (%3.2f %%)  %s\n", $oaTime * 1000, $tot_perc, "OVERALL TIME");
            
            echo "============================================================================\n";
            
            print("</pre>");
        }
    }

    function printTrace($enabled = false)
    {
        if ($this->trace_enabled || $enabled) {
            print("<pre>");
            print("Trace\n$this->trace\n\n");
            print("</pre>");
        }
    }
    
    // / Internal Use Only Functions
    
    /**
     * Get the current time as accuratly as possible
     */
    function getMicroTime()
    {
        $tmp = explode(" ", microtime());
        $rt = $tmp[0] + $tmp[1];
        return $rt;
    }

    /**
     * resume an individual timer
     */
    function __resumeTimer($name)
    {
        $this->trace .= "resume  $name\n";
        $this->startTime[$name] = $this->getMicroTime();
    }

    /**
     * suspend an individual timer
     */
    function __suspendTimer($name)
    {
        $this->trace .= "suspend $name\n";
        $this->endTime[$name] = $this->getMicroTime();
        if (! array_key_exists($name, $this->running))
            $this->running[$name] = $this->elapsedTime($name);
        else
            $this->running[$name] += $this->elapsedTime($name);
    }
}

$prof = new Profiler(false, false);

function profiler_start($name)
{
    global $prof;
    $prof->startTimer($name);
}

function profiler_stop($name)
{
    global $prof;
    $prof->stopTimer($name);
}

?>