#!/usr/bin/php -q
<?php

/*
 *
 * life.led
 * 2006.04.13 Zachary.Johnson
 * Updated 2009.01.15
 * http://zachstronaut.com/
 *
 */

$myself = $argv[0];

$ledArgs = explode( ' ', $argv[1] );

$h = intval( $ledArgs[0] );
$v = intval( $ledArgs[1] );
$delay = intval( $ledArgs[2] );

if ( $h < 4 || $h > 32 )
{
    $h = 16;
}

if ( $v < 4 || $v > 32 )
{
    $v = 16;
}

if ( $delay < 50 )
{
    $delay = 150;
}

$bits = str_pad( $ledArgs[3], $h * $v, '0' );

$mode = $ledArgs[4];

// top row is our button, color it in
for ( $i = 0; $i < $h; $i++ )
{ 
    $bits{$i} = '1';
}

$clicked = -1;

if ( $argv[2] )
{
    $clicked = intval( substr( $argv[2], 2 ) );

    // Was our top row clicked?
    if ( $clicked >= 0 && $clicked < $h )
    {
        if ( $mode != 'game' )
        {
            $mode = 'game';
        }
        else
        {
            $mode = '';
        }
    }
}

// game running mode
if ( $mode == 'game' )
{
    $newbits = $bits;
    
    $bits = str_pad( substr( $bits, $h ), $h * $v, '0', STR_PAD_LEFT );
    
    for ( $i = 0; $i < $h * $v; $i++ )
    { 
        if ( $bits{$i} == '1' )
        {
            $n = neighbors( $i, $bits, $h, $v );
            
            if ( $n < 2 )
            {
                $newbits{$i} = '0';
            }
            if ( $n > 3 )
            {
                $newbits{$i} = '0';
            }
        }
        else if ( $bits{$i} == '0' )
        {
            $n = neighbors( $i, $bits, $h, $v );
            if ( $n == 3 )
            {
                $newbits{$i} = '1';
            }
        }
    }
    
    ?>
    <ul>
        <!-- Horizontal # of LEDs -->
        <li><?= $h ?></li>
        <!-- Vertical # of LEDs -->
        <li><?= $v ?></li>
        <!-- LED states bit field -->
        <li><?= $newbits ?></li>
        <!-- Next URL to load -->
        <li>script:<?= $myself ?> <?= $h ?> <?= $v ?> <?= $delay ?> <?= $newbits ?> game</li>
        <!-- Time until refresh in milliseconds, 0 means do not refresh -->
        <li><?= $delay ?></li>
        <!-- URL to load if an LED is clicked -->
        <li>script:<?= $myself ?> <?= $h ?> <?= $v ?> <?= $delay ?> <?= $newbits ?> game</li>
        <!-- URL to open in browser window -->
        <li></li>
    </ul>
    <?php
}

// setup / draw mode
else
{
    if ( $clicked >= $h && $clicked < $h * $v )
    {
        if ( $bits{$clicked} == '0' )
        {
            $bits{$clicked} = '1';
        }
        else
        {
            $bits{$clicked} = '0';
        }
    }
    
    ?>
    <ul>
        <!-- Horizontal # of LEDs -->
        <li><?= $h ?></li>
        <!-- Vertical # of LEDs -->
        <li><?= $v ?></li>
        <!-- LED states bit field -->
        <li><?= $bits ?></li>
        <!-- Next URL to load -->
        <li></li>
        <!-- Time until refresh in milliseconds, 0 means do not refresh -->
        <li>0</li>
        <!-- URL to load if an LED is clicked -->
        <li>script:<?= $myself ?> <?= $h ?> <?= $v ?> <?= $delay ?> <?= $bits ?></li>
        <!-- URL to open in browser window -->
        <li></li>
    </ul>
    <?php
}

function neighbors( $i, $bits, $h, $v )
{    
    $count = 0;
    
    $checkMe = array();
    $checkMe[] = $i - $h;
    $checkMe[] = $i - $h + 1;
    $checkMe[] = $i + 1;
    $checkMe[] = $i + $h + 1;
    $checkMe[] = $i + $h;
    $checkMe[] = $i + $h - 1;
    $checkMe[] = $i - 1;
    $checkMe[] = $i - $h - 1;
    
    foreach ( $checkMe as $k )
    {
        if ( $bits{$k} == '1' )
        {
            $count++;
        }
    }
    
    return $count;
}

/*
function n( $i )
{
    global $h;
    
    return $i - $h;
}

function ne( $i )
{
    global $h;
    
    return $i - $h + 1;
}

function e( $i )
{
    return $i + 1;
}

function se( $i )
{
    global $h;
    
    return $i + $h + 1;
}

function s( $i )
{
    global $h;
    
    return $i + $h;
}

function sw( $i )
{
    global $h;
    
    return $i + $h - 1;
}

function w( $i )
{
    return $i - 1;
}

function nw( $i )
{
    global $h;
    
    return $i - $h - 1;
}
*/

?>