<?php require_once 'vendor/autoload.php';

class FirestoreDB {

  protected $database;
  protected $usermame;
  protected $password;

  protected $connection = null;

  /**
   * @param $database database path
   * @param $username username
   * @param $password password
   */
  public function __construct (string $database = '', string $username = '', string $password = '') {
    if (preg_match('/[^a-z_\-0-9]/i', $database)) {
      throw new InvalidArgumentException('$database (' . $database . ') has invalid character, allowed: a-z A-Z 0-9');
    }

    if (preg_match('/[^a-z_\-0-9]/i', $username)) {
      throw new InvalidArgumentException('$username (' . $username . ') has invalid character, allowed: a-z A-Z 0-9');
    }

    if (preg_match('/[^a-z_\-0-9]/i', $password)) {
      throw new InvalidArgumentException('$password (' . $password . ') has invalid character, allowed: a-z A-Z 0-9');
    }
  }

  /**
   * connect database
   *
   * @throws RuntimeException if cannot connect to database
   */
  public function connect () : void {
    try {
      $this->connection = ibase_connect (
        $this->database,
        $this->username,
        $this->password
      );
    } catch (Exception $e) {
      throw new RuntimeException('cannot connect to database: ' . $e->getMessage());
    }
  }


  /**
   * disconnect database
   */
  public function disconnect () : void {
    ibase_close($this->connection);
  }


  /**
   * check if connection is open and connected
   *
   * @return bool - if database is connected
   */
  public function is_connected () : bool {
    return ($this->connection === null) ? false : true;
  }
}