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<?php
/**
 * Autocompiles a less-file to a css-file using phpless.
 *
 * Uses a cache-file before compiling. Uses gzip. Caches the resulting css-file by using a HTTP-
 * header with Last-Modified.
 * Read more on lessphp: http://leafo.net/lessphp/
 * Read more on less: http://lesscss.org/
 *
 * @author Mikael Roos mos@dbwebb.se
 * @example http://dbwebb.se/kod-exempel/lessphp/
 * @link https://github.com/mosbth/stylephp
 *
 */

/**
 * Add config-file if available
 * 
 */
$configFile = defined('STYLE_CONFIG') ? constant('STYLE_CONFIG') : __DIR__.'/style_config.php';

$config = require $configFile;

include $config['path_lessphp'];



/**
 * Check settins before proceeding
 */
if (!isset($config['style_file'])) {
    preg_match('#^[a-z0-9A-Z-_]+$#', $config['style_file']) 
        or die('Filename for style_file contains invalid characters.');    
}



/**
 * Compile less to css. Creates a cache-file of the last compiled less-file.
 *
 * This code is originally from the manual of lessphp.
 *
 * @param string $inputFile  the filename of the less-file.
 * @param string $outputFile the filename of the css-file to be created.
 * @param array  $config     with configuration details.
 *
 * @return void
 */
function autoCompileLess($inputFile, $outputFile, $config) 
{
    $cacheFile = $inputFile.".cache";

    if (file_exists($cacheFile)) {
       $cache = unserialize(file_get_contents($cacheFile));
    } else {
        $cache = $inputFile;
    }

    $less = new lessc;

    // Add custom less functions
    if (isset($config['functions'])) {
        foreach ($config['functions'] as $key => $val) {
            $less->registerFunction($key, $val);
        }    
    }

    // Add import dirs
    if (isset($config['imports'])) {
        foreach($config['imports'] as $val) {
            $less->addImportDir($val);
        }    
    }

    // Set output formatter
    if (isset($config['formatter'])) {
        $less->setFormatter($config['formatter']);
    }

    // Preserve comments
    if (isset($config['comments'])) {
        $less->setPreserveComments($config['comments']);
    }

    // Compile a new cache
    $newCache = $less->cachedCompile($cache);
    if (!is_array($cache) || $newCache["updated"] > $cache["updated"]) {
        file_put_contents($cacheFile, serialize($newCache));
        file_put_contents($outputFile, $newCache['compiled']);
    }
}



//
// Compile and output the resulting css-file, use caching whenever suitable.
//
$less = $config['style_file'] . '.less';
$css  = $config['style_file'] . '.css';
$changed = autoCompileLess($less, $css, $config);
$time = filemtime($css);
$gmdate = gmdate("D, d M Y H:i:s", $time);



//
// Write it out and leave a response, use gzip if available
//
ob_start("ob_gzhandler") or ob_start();
header('Last-Modified: ' . $gmdate . " GMT"); 
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $time){  
    header("HTTP/1.0 304 Not Modified");  
} else {  
    header('Content-type: text/css');
    readfile($css);  
}