<?php
class News_model extends DB_Model
{

	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct();
		$this->dbTable = 'campus.tbl_news';
		$this->pk = 'news_id';
	}

    /**
     * Get all News ordered by date. (most actual on top)
     * @param null $limit   Amount of news.
     * @return array
     */
    public function getAll($limit = null)
    {
        return $this->loadWhere('
            text IS NOT NULL
            AND datum <= NOW() AND (datum_bis IS NULL OR datum_bis >= now()::date)
            ORDER BY datum DESC
            LIMIT '. $this->escape($limit)
        );
    }

    /**
     * @param string            $sprache
     * @param string            $studiengang_kz
     * @param integer | null    $semester
     * @param string            $fachbereich_kurzbz
     * @param boolean           $sichtbar
     * @param integer           $maxalter
     * @param integer           $maxnews
     * @param boolean           $all
     * @param boolean           $mischen
     * 
     * TODO(chris): this is not a good function -> the params are all over the place
     * 
     * @return stdObj
     */
    public function getNewsWithContent($sprache, $studiengang_kz, $semester, $fachbereich_kurzbz = null, $sichtbar = true, $maxalter = 0, $maxnews = 0, $all = false, $mischen = true)
    {
        $studiengang_kz = trim($studiengang_kz);
        $fachbereich_kurzbz = trim($fachbereich_kurzbz);

        $where = [];
        $params = [];
        if (trim($maxalter) != '0')
        {
            $where[] = "(now()-datum) < interval ? days";
            $params[] = $maxalter;
        }
        if (!$all)
        {
            $where[] = "datum <= now()";
            $where[] = "(datum_bis >= now()::date OR datum_bis IS NULL)";
        }
        if ($fachbereich_kurzbz != '*')
        {
            if ($fachbereich_kurzbz == '')
            {
                $where[] = "fachbereich_kurzbz IS NULL";
            }
            else
            {
                $where[] = "fachbereich_kurzbz = ?";
                $params[] = $fachbereich_kurzbz;
            }
        }
        if ($studiengang_kz == '0')
        {
            $where[] = "studiengang_kz = ?";
            $params[] = $studiengang_kz;
            if ($semester === NULL)
                $where[] = "semester IS NULL";
            elseif ($semester === 0)
                $where[] = "semester = 0";
        }
        elseif ($studiengang_kz != '')
        {
            $add = $mischen === true ? " OR (studiengang_kz = 0 AND semester IS NULL)" : "";
            $where[] = "((studiengang_kz = ? AND semester = ?) OR (studiengang_kz = ? AND semester = 0) OR (studiengang_kz = 0 AND semester = ?)" . $add . ")";
            $params[] = $studiengang_kz;
            $params[] = $semester;
            $params[] = $studiengang_kz;
            $params[] = $semester;
        }
        $this->addJoin('campus.tbl_contentsprache cs', 'content_id');
        
        $where[] = "cs.sichtbar = " . ($sichtbar ? "true" : "false");
        
        $where[] = "cs.sprache = (CASE WHEN EXISTS(SELECT 1 FROM campus.tbl_contentsprache cs2 WHERE cs2.content_id=" . $this->dbTable . ".content_id AND sprache=?) THEN ? ELSE ? END)";
        $params[] = $sprache;
        $params[] = $sprache;
        $params[] = DEFAULT_LANGUAGE;
        
        $where[] = "cs.version = (SELECT MAX(version) FROM campus.tbl_contentsprache cs3 WHERE cs3.content_id=" . $this->dbTable . ".content_id AND cs3.sprache = (CASE WHEN EXISTS(SELECT 1 FROM campus.tbl_contentsprache cs2 WHERE cs2.content_id=" . $this->dbTable . ".content_id AND sprache=?) THEN ? ELSE ? END))";
        $params[] = $sprache;
        $params[] = $sprache;
        $params[] = DEFAULT_LANGUAGE;

        $where = implode(" AND ", $where);

        $this->addOrder('datum', 'DESC');
        if ($maxnews)
            $this->addLimit($maxnews);


        $this->db->where($where, NULL, FALSE);

        $sql = $this->db->get_compiled_select($this->dbTable);

        return $this->execQuery($sql, $params);
    }

}