<?php

/**
 * W3TC Mobile detection
 */

/**
 * Class W3_Mobile
 */
class W3_Mobile
{
    /**
     * Mobile groups
     * @var array
     */
    var $groups = array();
    
    /**
     * PHP5-style constructor
     */
    function __construct()
    {
        require_once W3TC_LIB_W3_DIR . '/Config.php';
        $config = & W3_Config::instance();
        
        $this->groups = $config->get_array('mobile.rgroups');
    }
    
    /**
     * PHP4-style constructor
     */
    function W3_Mobile()
    {
        $this->__construct();
    }
    
    /**
     * Returns object instance
     *
     * @return W3_Mobile
     */
    function &instance()
    {
        static $instances = array();
        
        if (!isset($instances[0])) {
            $class = __CLASS__;
            $instances[0] = & new $class();
        }
        
        return $instances[0];
    }
    
    /**
     * Detects mobile group
     * 
     * @return string
     */
    function get_group()
    {
        static $mobile_group = null;
        
        if ($mobile_group === null) {
            foreach ($this->groups as $group => $config) {
                if (isset($config['enabled']) && $config['enabled'] && isset($config['agents'])) {
                    foreach ((array) $config['agents'] as $agent) {
                        if ($agent && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('~' . $agent . '~i', $_SERVER['HTTP_USER_AGENT'])) {
                            $mobile_group = $group;
                            
                            return $mobile_group;
                        }
                    }
                }
            }
            
            $mobile_group = false;
        }
        
        return $mobile_group;
    }
    
    /**
     * Returns temaplte
     * 
     * @return string
     */
    function get_template()
    {
        $theme = $this->get_theme();
        
        if ($theme) {
            list($template, ) = explode('/', $theme);
            
            return $template;
        }
        
        return false;
    }
    
    /**
     * Returns stylesheet
     * 
     * @return string
     */
    function get_stylesheet()
    {
        $theme = $this->get_theme();
        
        if ($theme) {
            list(, $stylesheet) = explode('/', $theme);
            
            return $stylesheet;
        }
        
        return false;
    }
    
    /**
     * Returns redirect
     * 
     * @return string
     */
    function get_redirect()
    {
        $group = $this->get_group();
        
        if (isset($this->groups[$group]['redirect'])) {
            return $this->groups[$group]['redirect'];
        }
        
        return false;
    }
    
    /**
     * Returns theme
     * 
     * @return string
     */
    function get_theme()
    {
        $group = $this->get_group();
        
        if (isset($this->groups[$group]['theme'])) {
            return $this->groups[$group]['theme'];
        }
        
        return false;
    }
    
    /**
     * Return array of themes
     * 
     * @return array
     */
    function get_themes()
    {
        $themes = array();
        $wp_themes = get_themes();
        
        foreach ($wp_themes as $wp_theme) {
            $theme_key = sprintf('%s/%s', $wp_theme['Template'], $wp_theme['Stylesheet']);
            $themes[$theme_key] = $wp_theme['Name'];
        }
        
        return $themes;
    }
}