<?php
/**
 * CSS.inc.css 
 * code by strangecode :: www.strangecode.com :: this document contains copyrighted information
 *
 * Dynamically outputs cached CSS data.
 *
 * @author  Quinn Comendant <quinn@strangecode.com>
 * @version 1.0
 */
class CSS {

    // Include these style sheets.
    var $_css_files = array();
    
    // Cache style sheets?
    var $_params = array(
        'cache_css' => true,
        'character_set' => 'ISO-8859-1',
    );
    
    /**
     * Constructor.
     */
    function __construct()
    {
        $this->_params['character_set'] = isset($CFG->character_set) ? $CFG->character_set : $this->_params['character_set'];
    }

    /**
     * Set (or overwrite existing) parameters by passing an array of new parameters.
     *
     * @access public
     *
     * @param  array    $params     Array of parameters (key => val pairs).
     */
    function setParam($params=null)
    {
        if (isset($params) && is_array($params)) {
            // Merge new parameters with old overriding only those passed.
            $this->_params = array_merge($this->_params, $params);
        } else {
            logMsg(sprintf('Supplied argument is not an array: %s', $params), LOG_WARNING, __FILE__, __LINE__);
        }
    }

    /**
     * Return the value of a parameter.
     *
     * @access  public
     *
     * @param   string  $param      The key of the parameter to return.
     *
     * @return  mixed               Parameter value.
     */
    function getParam($param)
    {
        return $this->_params[$param];
    }
    
    /**
     * Add a file-path to the array of files to include as CSS.
     *
     * @access  public
     *
     * @param   string  Full path to css file.
     *
     * @return  bool    True on success, false on failure.
     */
    function setFile($file)
    {
        if (file_exists($file)) {
            $this->_css_files[] = $file;
            return true;
        } else {
            logMsg(sprintf('CSS file non-existant: %s', $file), LOG_WARNING, __FILE__, __LINE__);
            return false;
        }
    }

    /**
     * Output headers for CSS.
     *
     * @access  public
     *
     * @return  bool    False if no files have been set.
     */
    function headers()
    {
        if (empty($this->_css_files)) {
        	logMsg(sprintf('CSS::headers called without specifiying any files.', null), LOG_NOTICE, __FILE__, __LINE__);
        	return false;
        }
        
        // Get time of latest modified file.
        $files_mtime = array_map('filemtime', array_merge($this->_css_files, array(__FILE__)));
        sort($files_mtime, SORT_NUMERIC);
        $mtime = array_pop($files_mtime);
        
        if ($this->_params['cache_css']) {
            header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $mtime) . ' GMT');
            header('Cache-Control: public, max-age=86400');
        } else {
            header('Expires: -1');
            header('Pragma: no-cache');
            header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
        }
        header('Content-Type: text/css; charset=' . $this->_params['character_set']);
    }
    
    /**
     * Include CSS files specified by setFile().
     *
     * @access  public
     *
     * @return  bool    False if no files have been set.
     */
    function output()
    {
        if (empty($this->_css_files)) {
        	logMsg(sprintf('CSS::output called without specifiying any files.', null), LOG_NOTICE, __FILE__, __LINE__);
        	return false;
        }
        
        foreach ($this->_css_files as $file) {
            include $file;
        }
    }
}
?>