<?php
class CommonDescriptionService {
    var $db;
    var $tablename;

    function &getInstance(&$db) {
        static $instance;
        if (!isset($instance))
            $instance =& new CommonDescriptionService($db);
        return $instance;
    }

    function CommonDescriptionService(&$db) {
        $this->db =& $db;
        $this->tablename = $GLOBALS['tableprefix'] .'commondescription';
    }

    function addTagDescription($tag, $desc, $uId, $time) {
	// Check if no modification
	$lastDesc = $this->getLastTagDescription($tag);
	if($lastDesc['cdDescription'] == $desc) {
	    return true;
	}

	// If modification
	$datetime = gmdate('Y-m-d H:i:s', $time);
	$values = array('tag'=>$tag, 'cdDescription'=>$desc, 'uId'=>$uId, 'cdDatetime'=>$datetime);
	$sql = 'INSERT INTO '. $this->getTableName() .' '. $this->db->sql_build_array('INSERT', $values);

	if (!($dbresult =& $this->db->sql_query($sql))) {
	    $this->db->sql_transaction('rollback');
	    message_die(GENERAL_ERROR, 'Could not add tag description', '', __LINE__, __FILE__, $sql, $this->db);
	    return false;
	}

	return true;
    }

    function getLastTagDescription($tag) {
	$query = "SELECT *";
	$query.= " FROM `". $this->getTableName() ."`";
	$query.= " WHERE tag='".$tag."'";
	$query.= " ORDER BY cdDatetime DESC";

        if (!($dbresult = & $this->db->sql_query_limit($query, 1, 0))) {
            message_die(GENERAL_ERROR, 'Could not get tag description', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        if ($row =& $this->db->sql_fetchrow($dbresult)) {
            return $row;
        } else {
            return false;
        }
    }

    function getAllTagsDescription($tag) {
	$query = "SELECT *";
	$query.= " FROM `". $this->getTableName() ."`";
	$query.= " WHERE tag='".$tag."'";
	$query.= " ORDER BY cdDatetime DESC";

        if (!($dbresult = & $this->db->sql_query($query))) {
            message_die(GENERAL_ERROR, 'Could not get tag descriptions', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        return $this->db->sql_fetchrowset($dbresult);

    }

    function getDescriptionById($cdId) {
	$query = "SELECT *";
	$query.= " FROM `". $this->getTableName() ."`";
	$query.= " WHERE cdId='".$cdId."'";

        if (!($dbresult = & $this->db->sql_query($query))) {
            message_die(GENERAL_ERROR, 'Could not get tag descriptions', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        if ($row =& $this->db->sql_fetchrow($dbresult)) {
            return $row;
        } else {
            return false;
        }

    }

    function addBookmarkDescription($bHash, $title, $desc, $uId, $time) {
	// Check if no modification
	$lastDesc = $this->getLastBookmarkDescription($bHash);
	if($lastDesc['cdTitle'] == $title && $lastDesc['cdDescription'] == $desc) {
	    return true;
	}

	// If modification
	$datetime = gmdate('Y-m-d H:i:s', $time);
	$values = array('bHash'=>$bHash, 'cdTitle'=>$title, 'cdDescription'=>$desc, 'uId'=>$uId, 'cdDatetime'=>$datetime);
	$sql = 'INSERT INTO '. $this->getTableName() .' '. $this->db->sql_build_array('INSERT', $values);

	if (!($dbresult =& $this->db->sql_query($sql))) {
	    $this->db->sql_transaction('rollback');
	    message_die(GENERAL_ERROR, 'Could not add bookmark description', '', __LINE__, __FILE__, $sql, $this->db);
	    return false;
	}
	return true;
    }

    function getLastBookmarkDescription($bHash) {
	$query = "SELECT *";
	$query.= " FROM `". $this->getTableName() ."`";
	$query.= " WHERE bHash='".$bHash."'";
	$query.= " ORDER BY cdDatetime DESC";

        if (!($dbresult = & $this->db->sql_query_limit($query, 1, 0))) {
            message_die(GENERAL_ERROR, 'Could not get bookmark description', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        if ($row =& $this->db->sql_fetchrow($dbresult)) {
            return $row;
        } else {
            return false;
        }
    }

    function getAllBookmarksDescription($bHash) {
	$query = "SELECT *";
	$query.= " FROM `". $this->getTableName() ."`";
	$query.= " WHERE bHash='".$bHash."'";
	$query.= " ORDER BY cdDatetime DESC";

        if (!($dbresult = & $this->db->sql_query($query))) {
            message_die(GENERAL_ERROR, 'Could not get bookmark descriptions', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        return $this->db->sql_fetchrowset($dbresult);

    }


    function deleteAll() {
	$query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
	$this->db->sql_query($query);
    }

    // Properties
    function getTableName()       { return $this->tablename; }
    function setTableName($value) { $this->tablename = $value; }
}
?>
