<?php

/*
 * R O U T E R  S C R I P T
 * messages are ideally submitted to this smsc and are
 * consequently routed via configured routing rules
 * contained in routing.ini
 *
 * NOTE: Country codes represented as detailed in ISO 8601
 */

require_once('/var/www/sms.solami.co.ke/Utilities/Url-lib.php');

/*
 * Some rudimentary configs
 */
$msisdn_regexes = './routing_configs/country_msisdn_regexes.ini';
$routing_path = './routing_configs/routing.ini';
$kannel_configs = './routing_configs/kannel_configs.ini';

/*
 * Main
 */
 print submit_message_to_kannel();

/*
 * Fetch routing configs
 */
function get_routing_configs ($country="ke") {
    global $routing_path;
    $routes = parse_ini_file($routing_path, true);
    print "SPECIFIC => [" . $country . "] " . print_r($routes[$country], true);
    return $routes["$country"];
}

/*
 * Get msisdn filter regex
 */
function get_sanitize_regex ($key) {
    global $msisdn_regexes;
    $regexes = parse_ini_file($msisdn_regexes);
    return $regexes[$key];
}

/*
 * Clean up the mobile number
 */
function sanitize_msisdn ($number) {
    $sanitize_regex = get_sanitize_regex('ke');
    return preg_replace($sanitize_regex,"254$1", $number);
}

/*
 * Pick a route that matches repeatedly and return all
 * routes that match in an array
 */
function select_route ($msisdn, $country=null) {
    $hits = [];
    $msisdn = sanitize_msisdn($msisdn);
    $routes = get_routing_configs($country);
    print "ROUTES => " . print_r($routes, true);
    array_walk($routes,
        function ($route, $regex, $number)
              use (&$hits)
                {
                   if (preg_match(
                       '/^' . $regex . '/',
                       $number
                  )) {
                       $hits[] = $route;
                   }
         },
         $msisdn
        );

    /* SET ROUTE */
    if (count($hits) == 0)
    $route = 'INFOBIP';
    else
    $route = $hits[0];

    return $route;
}

/*
 * http://localhost/solami/api/route_msg.php?dest=%p&message=%a&source=%P&udh=%u&msgID=%I&box=%n&coding=%C&user=%n&METADATA=%D
 * ----------------------------------------------------------------------------------------------------------------------------------
 * from=22677
 * to=254708146140
 * text=Hi+click+http%3A%2F%2Fmuziq.co.ke%2Fb%2Fcca9f0+to+get+Handu+Hau+by+Charles+Njoroge.+Bonyeza+*699*20%23+For+Your+Slice+of+Gospel
 * priority=0
 * smsc=safaricom
 * username=safaricom
 * password=safaricom-pass
 * dlr-mask=
 * dlr-url=http%3A%2F%2F172.31.186.204%3A9000%2Fapi%2Fdlr%3Ftype%3D%25d%26time%3D%25t%26usr%3D%25n%26message%3D%25b%26kannel_id%3D%25F%26MSISDN%3D%25p%26dlrvalue%3D%25A%26message_id%3D176127627
 * http://ke-pr-gw2:13013/cgi-bin/sendsms
 * ----------------------------------------------------------------------------------------------------------------------------------
 */

/*
 * Upack data from the get params into data
 * then return that data array
 */
function get_data () {
    global $kannel_configs;
    $gateway_configs = parse_ini_file($kannel_configs);
    $data = [
        'source' => $_GET['source'],
        'msisdn' => $_GET['dest'],
        'message' => urlencode($_GET['message']),
        'smsc' => select_route($_GET['dest']),
        'metadata' => $_GET['METADATA'],
        ];
    $data = array_merge($gateway_configs, $data);
    print print_r($data, true);
    return $data;
}

/*
 * Construct kannel URL
 */
 function construct_kannel_link ( $data ) {
     /* Base URL */
     $format_string .= "http://localhost:%d/cgi-bin/sendsms?";

     /* Auth */
     $format_string .= "username=%s&password=%s&";

     /* Message Params */
     $format_string .= "from=%s&to=%d&text=%s&";

     /* ! !  R O U T I N G  ! !  */
     $format_string .= "smsc=%s&";

     /* Metadata */
     $format_string .= "meta-data=%s";

     return vsprintf($format_string, $data);
 }

/*
 * Call kannel URL
 */
function submit_message_to_kannel () {
    $url = construct_kannel_link(get_data());
    $link = new Url($url);
    $link->callUrl();
    return $link;
}