<?php
/**
 * Part of Linksys WRT3G tools
 *
 * PHP version 5
 *
 * @category Tools
 * @package  linksys-wrt3g-tools
 * @author   Christian Weiske <cweiske@cweiske.de>
 * @license  AGPL v3
 * @link     http://cweiske.de/linksys-wrt3g-tools.htm
 */
require_once 'HTTP/Request2.php';
require_once 'Wrt3g/Config.php';
require_once 'Wrt3g/HtmlParser.php';
require_once 'Wrt3g/RequestObserver.php';

/**
 * Main class to interact with the router.
 *
 * @category Tools
 * @package  linksys-wrt3g-tools
 * @author   Christian Weiske <cweiske@cweiske.de>
 * @license  AGPL v3
 * @link     http://cweiske.de/linksys-wrt3g-tools.htm
 */
class Wrt3g
{
    /**
     * Logging verbosity
     * 0 - no debug logging
     * 1 - show important details (connected URLs)
     * 2 - show internal details
     * 3 - show HTTP requests and responses
     *
     * @var integer
     */
    public $verbosity = 0;

    /**
     * Class to send HTTP Requests with.
     * Needs to be compatible with HTTP_Request2
     *
     * @var string
     */
    public $requestClass = 'HTTP_Request2';

    /**
     * Configuration object
     *
     * @var Wrt3g_Config
     */
    public $config;


    /**
     * Loads the configuration from file and cmdline options
     *
     * @param array $options Command line options array
     *
     * @return void
     *
     * @see Wrt3g_Config
     */
    public function loadConfig($options = array())
    {
        $this->config = new Wrt3g_Config($this);
        $this->config->load($options);
    }


    /**
     * Returns the base URL to use for requests that require authentification.
     * Includes username, password and host.
     *
     * @return string URL without trailing slash after the host
     */
    protected function getAuthBaseUrl()
    {
        return 'http://'
            . $this->config->user
            . ':' . $this->config->password
            . '@' . $this->config->host;
    }


    /**
     * Returns the base URL to use for requests that do
     * not require authentification.
     *
     * @return string URL without trailing slash after the host
     */
    protected function getAnonBaseUrl()
    {
        return 'http://' . $this->config->host;
    }


    /**
     * Creates a new HTTP_Request2 object, attaches an observer
     * if necessary and returns it.
     *
     * @return HTTP_Request2
     */
    protected function createRequest()
    {
        $r = new $this->requestClass();
        if ($this->verbosity >= 3) {
            //register observer
            $r->attach(new Wrt3g_RequestObserver($this));
        }
        return $r;
    }


    /**
     * Reboots the router.
     *
     * @return HTTP_Request2_Response
     *
     * @throws Exception When the router can't be reached, or unauthorized
     */
    public function reboot()
    {
        $url = $this->getAuthBaseUrl() . '/apply.cgi';
        $this->log('Connecting to ' . $url);

        $r = $this->createRequest();
        $r->setMethod(HTTP_Request2::METHOD_POST);
        $r->setUrl($url);
        $r->addPostParameter('action', 'Reboot');
        $r->addPostParameter('submit_button', 'Diagnostics');
        $r->addPostParameter('wait_time', 1);

        $resp = $r->send();
        $this->checkResponseStatus($resp);
        return $resp;
    }//public function reboot()


    /**
     * Retrieves status information about the router
     *
     * @return array Array with several key-value pairs
     *               connection => connecting, disconnected, connected
     *
     * @throws Exception When the router can't be reached, or unauthorized
     */
    public function getConnectionStatus()
    {
        $arRetval = array();

        $strUrlBase = $this->getAuthBaseUrl();
        $parser = new Wrt3g_HtmlParser();

        /**
         * Connection status
         */
        $r = $this->createRequest();
        $r->setMethod(HTTP_Request2::METHOD_GET);
        $r->setUrl($strUrlBase . '/index_wstatus2.asp');
        $this->log('Connecting to ' . $strUrlBase . '/index_wstatus2.asp', 1);
        $resp = $r->send();
        $this->checkResponseStatus($resp);
        $arRetval = $parser->index_wstatus2($resp->getBody());

        /**
        * GPRS/UMTS Status
        */
        $r->setUrl($strUrlBase . '/index_wstatus1.asp');
        $this->log('Connecting to ' . $strUrlBase . '/index_wstatus1.asp', 1);
        $resp = $r->send();
        $this->checkResponseStatus($resp);
        $body = $resp->getBody();
        $arRetval = array_merge($arRetval, $parser->index_wstatus1($body));

        return $arRetval;
    }//public function getConnectionStatus()


    /**
     * Loads "Status_NoAuth.asp" page and parses the body.
     *
     * @return array Associative array with connection status.
     *
     * @throws Exception When something goes wrong, i.e. router not
     *                   reachable
     */
    protected function loadStatus_NoAuth()
    {
        $strUrlBase = $this->getAnonBaseUrl();

        $url = $strUrlBase . '/Status_NoAuth.asp';
        $this->log('Connecting to ' . $url, 1);

        $r = $this->createRequest();
        $r->setMethod(HTTP_Request2::METHOD_GET);
        $r->setUrl($url);
        $resp = $r->send();
        $this->checkResponseStatus($resp);

        $parser = new Wrt3g_HtmlParser();

        return $parser->status_noauth(
            $resp->getBody()
        );
    }


    /**
     * Checks the HTTP response code and throws an exception if it
     * is not in the 200 range.
     *
     * @param HTTP_Request2_Response $resp HTTP response object
     *
     * @return void
     *
     * @throws Exception When the status is not 200-299
     */
    protected function checkResponseStatus(HTTP_Request2_Response $resp)
    {
        $nStatus = $resp->getStatus();
        $this->log($nStatus . ' ' . $resp->getReasonPhrase(), 1);
        if (intval($nStatus / 100) == 2) {
            //2xx status is fine
            return;
        }

        throw new Exception(
            'HTTP Error: ' . $nStatus . ' ' . $resp->getReasonPhrase()
        );
    }


    /**
     * Retrieves pc card/SIM status information
     *
     * @return array Array with several key-value pairs
     *               connection => connecting, disconnected, connected
     *
     * @throws Exception When the router can't be reached
     */
    public function getCardStatus()
    {
        $arRetval = $this->loadStatus_NoAuth();

        return array_intersect_key(
            $arRetval,
            array(
                'card model'    => 0,
                'card revision' => 0,
                'card firmware' => 0,
                'IMSI'          => 0
            )
        );
    }


    /**
     * Retrieves all status information one can get.
     *
     * @return array Array with several key-value pairs
     *               connection => connecting, disconnected, connected
     *
     * @throws Exception When the router can't be reached
     */
    public function getFullStatus()
    {
        return $this->loadStatus_NoAuth();
    }


    /**
     * Log a message to stdout.
     *
     * @param string|object $msg   Message to display. May even be a response
     *                             object
     * @param integer       $level Log level, see $verbosity
     *
     * @return void
     */
    public function log($msg, $level = 1)
    {
        if ($this->verbosity >= $level) {
            echo $msg . "\n";
        }
    }
}
?>