<?php

class AnnouncementRepository extends ModelRepository
{
  private static $_singletonInstance = null;

  public function __construct()
  {
    parent::__construct('Announcement');
  }

  /**
   * Returns an initiated AnnouncementRepository
   *
   * @return AnnouncementRepository
   */
  public static function getInstance()
  {
    if (self::$_singletonInstance === null)
    {
        self::$_singletonInstance = new AnnouncementRepository();
    }

    return self::$_singletonInstance;
  }


  /**
   * Get Announcement object by id
   *
   * @param  int $id
   * @return Announcement
   */
  public function getObjectById($id)
  {
    if (!isInt($id))
    {
        return new Announcement(0);
    }

    static $cache = array();
    $key = $id;
    if (!isset($cache[$key]))
    {
        $cache[$key] = $this->getObjectFromSql('select * from announcements where id = ? LIMIT 1', [$id]);
    }
    return $cache[$key];
  }


  /**
   * Get the most recent x Announcements
   *
   * @param  int $limit (default 1)
   * @return Announcement
   */
  public function getObjectListByLatestDate($limit = 1)
  {
    if (!isInt($limit))
    {
        return [new Announcement(0)];
    }
    $announcements = $this->getObjectListFromSql('select * from announcements where start_date < NOW() and (end_date is null OR end_date > NOW()) order by id desc limit ' . $limit, []);
    return count($announcements) > 0 ? $announcements : [new Announcement(0)];
  }


  /**
   * Returns an object based on the provided sql
   *
   * @param  string $sql
   * @param  array  $arg
   * @return StandardItem
   */
  public function getObjectFromSql($sql, $arg)
  {
    $pdo = PDOMysqlConnection::getInstance();

    $stmt = $pdo->prepareAndExec($sql, $arg);
    if ($record = $stmt->fetch(PDO::FETCH_ASSOC))
    {
        return $this->_getObjectFromRecord($record);
    }

    // No object found, return empty object
    return new Announcement(0);
  }


  /**
   * Returns an array of object based on the provided sql
   *
   * @param  string $sql
   * @param  array  $arg
   * @return array
   */
   public function getObjectListFromSql($sql, $arg, $index = null)
   {
       $pdo = PDOMysqlConnection::getInstance();

       $stmt = $pdo->prepareAndExec($sql, $arg);
       $records = $stmt->fetchAll(PDO::FETCH_ASSOC);
       if (is_array($records) && !empty($records)) {
           return $this->_getObjectListFromRecords($records, $index);
       }

       // No object found, return empty array
       return [];
   }
 }