<?php
 
 namespace Telnyx;
 
 use \Symfony\Component\Process\Process;
 
 class TelnyxMock
 {
     protected static $process = null;
     protected static $port = -1;
 
     const PATH_SPEC = __DIR__ . '/openapi/spec3.json';
     const PATH_FIXTURES = __DIR__ . '/openapi/fixtures3.json';
 
     /**
      * Starts a telnyx-mock process with custom OpenAPI spec and fixtures files, if they exist.
      *
      * @return bool true if a telnyx-mock process was started, false otherwise.
      */
     public static function start()
     {
         if (!file_exists(self::PATH_SPEC)) {
             return false;
         }
 
         if (!is_null(static::$process) && static::$process->isRunning()) {
             echo "telnyx-mock already running on port " . static::$port . "\n";
             return true;
         }
 
         static::$port = static::findAvailablePort();
 
         echo "Starting telnyx-mock on port " . static::$port . "...\n";
 
         static::$process = new Process(join(' ', [
             'telnyx-mock',
             '-http-port',
             static::$port,
             '-spec',
             self::PATH_SPEC,
             '-fixtures',
             self::PATH_FIXTURES,
         ]));
         static::$process->start();
         sleep(1);
 
         if (static::$process->isRunning()) {
             echo "Started telnyx-mock, PID = " . static::$process->getPid() . "\n";
         } else {
             die("telnyx-mock terminated early, exit code = " . static::$process->wait());
         }
 
         return true;
     }
 
     /**
      * Stops the telnyx-mock process, if one was started. Otherwise do nothing.
      */
     public static function stop()
     {
         if (is_null(static::$process) || !static::$process->isRunning()) {
             return;
         }
 
         echo "Stopping telnyx-mock...\n";
         static::$process->stop(0, SIGTERM);
         static::$process->wait();
         static::$process = null;
         static::$port = -1;
         echo "Stopped telnyx-mock\n";
     }
 
     /**
      * Returns the port number used by the telnyx-mock process.
      *
      * @return int the port number used by telnyx-mock, or -1 if no telnyx-mock process was started
      */
     public static function getPort()
     {
         return static::$port;
     }
 
     /**
      * Finds a random available TCP port.
      *
      * @return int the port number
      */
     private static function findAvailablePort()
     {
         $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
         socket_bind($sock, "localhost", 0);
         $addr = null;
         $port = -1;
         socket_getsockname($sock, $addr, $port);
         socket_close($sock);
         return $port;
     }
 }