<?php

Class sms_gw_api {

  // WebServices parameters
  private $ws_url = null;
  private $ws_ssl_verify = true;

  private $ws_connect_timeout = 5;
  private $ws_timeout = 10;

  function sms_gw_api($ws_url, $ws_ssl_verify = true, $ws_connect_timeout = 5, $ws_timeout = 10){
    $this -> ws_url = $ws_url;
    $this -> ws_ssl_verify = $ws_ssl_verify;
    $this -> ws_connect_timeout = $ws_connect_timeout;
    $this -> ws_timeout = $ws_timeout;
  }

  /*
   * REST Request
   */

  private function _ws_call($method, $url, $data = false, $json = true) {
    if (is_null($this -> ws_url)) return;

    $curl = curl_init();

    switch ($method) {
      case "POST":
        curl_setopt($curl, CURLOPT_POST, 1);

        if ($data)
          curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        break;
      case "PUT":
        curl_setopt($curl, CURLOPT_PUT, 1);
        break;
      default:
        $method='GET';
        if ($data)
          $url = sprintf("%s?%s", $url, http_build_query($data));
    }

    if ($this -> ws_ssl_verify) {
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, TRUE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
    }
    else {
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1);
    }

    // Set timeouts
    curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $this -> ws_connect_timeout);
    curl_setopt($curl, CURLOPT_TIMEOUT, $this -> ws_timeout);

    $complete_url=$this -> ws_url.'/'.$url;
    curl_setopt($curl, CURLOPT_URL, $complete_url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    logging("DEBUG", "sms_gw_api : Call URL $complete_url");

    $result = curl_exec($curl);

    if(curl_errno($curl)) {
        logging("ERROR", "sms_gw_api : Error during $method request to ".$complete_url." : ".curl_error($curl));
        curl_close($curl);
        return False;
    }

    curl_close($curl);

	logging("DEBUG","sms_gw_api : Return => '$result'");
	
	if (!$json)
		return $result;

    try {
      $data = json_decode($result,true);
      logging("DEBUG","sms_gw_api : Decoded data :".print_r($data,1));
      return $data;
    }
    catch (Exception $e) {
      logging("ERROR","sms_gw_api : Error parsing $method request JSON result on ".$complete_url." : ".$e);
      return False;
    }
  }

  /**
   * send sms
   * @param string number
   * @param string text
   * @return struct sms gw return struct
   */
  function send_sms($number, $text){
    return self :: _ws_call(
      'GET',
      "",
      array(
        'number' => $number,
        'text' => $text,
      )
    );
  }

  /**
   * check gateway is alive
   * @return boolean sms gw status
   */
  function check_gateway(){
    $return=self :: _ws_call(
      'GET',
      "",
      array(),
      false
    );
    return ($return !== false && preg_match('/My SMS Gateway/', $return));
  }

}