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<?php
/**
 * Legacy interface for database classes
 *
 * This PDO connection must support the legacy database methods to
 * facilitate the complete migration to PDO and the new methods it brings.
 * It does not (and should not) introduce any new methods
 *
 * @copyright   http://www.impresscms.org/ The ImpressCMS Project
 * @license     http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License (GPL)
 *
 * @category    ICMS
 * @package     Database
 */

/**
 * Create and interact with a database connection using PDO
 *
 * @copyright http://www.impresscms.org/ The ImpressCMS Project
 * @category ICMS
 * @package Database
 * @subpackage PDO
 */
class icms_db_legacy_PdoDatabase extends icms_db_legacy_Database implements icms_db_legacy_IDatabase {

    /**
     * The PDO connection that performs operations behind the scenes
     *
     * @var icms_db_IConnection
     */
    protected $pdo;

    /**
     * Legacy database connection var - to be replaced by $pdo
     *
     * @var resource
     */
    public $conn;
    
    /**
     * Row count of the most recent statement
     *
     * @var int
     */
    protected $rowCount = 0;

    public function __construct($connection, $allowWebChanges = FALSE) {
        parent::__construct($connection, $allowWebChanges);
        $this->pdo = $connection;
        $this->conn = & $this->pdo; // only for legacy support
    }

    public function connect($selectdb = TRUE) {
        return TRUE;
    }

    public function close() {
        $this->pdo = NULL;
        return TRUE;
    }

    public function quoteString($string) {
        return $this->pdo->quote($string);
    }

    public function quote($string) {
        return $this->pdo->quote($string);
    }

    public function escape($string) {
        return $this->pdo->escape($string);
    }

    public function error() {
        $error = $this->pdo->errorInfo();
        return $error [2];
    }

    public function errno() {
        $error = $this->pdo->errorInfo ();
        return $error [1];
    }

    public function genId($sequence) {
        return 0; // will use auto_increment
    }

    public function query($sql, $limit = 0, $start = 0) {
        if (! $this->allowWebChanges && strtolower(substr(trim($sql), 0, 6)) != 'select') {
            trigger_error(_CORE_DB_NOTALLOWEDINGET, E_USER_WARNING);
            return FALSE;
        }
        return $this->queryF($sql, $limit, $start);
    }

    public function queryF($sql, $limit = 0, $start = 0) {
        $result = FALSE;
        /* Use Protector's db layer protection against possible SQLi
         * This needs to be done for legacy queries, since PDO only offers
         * SQLi protection when you use bindParam and bindValue, and then
         * use prepare() and execute() on the statement
         */
        if (FALSE === icms_db_legacy_mysql_Utility::checkSQL($sql)) {
            return $result;
        }
        
        if (!empty($limit)) {
            $start = !empty($start) ? (int) $start . ',' : '';
            $sql .= ' LIMIT ' . $start . (int) $limit;
        }
        try {
            $result = $this->pdo->query($sql);
            if ($result) { // added by claudia, ImpressCMS.org
                $this->rowCount = $result->rowCount();
            } else { // added by claudia, ImpressCMS.org
                $this->rowCount = FALSE; // added by claudia, ImpressCMS.org
            } // added by claudia, ImpressCMS.org
        } catch (Exception $e) {
        }
        return $result;
    }

    public function getInsertId() {
        return $this->pdo->lastInsertId();
    }

    public function getAffectedRows() {
        return $this->rowCount;
    }

    public function getFieldName($result, $offset) {
        if ($result) {
            $column = $result->getColumnMeta($offset);
            return $column['name'];
        } else {
            return FALSE;
        }
    }

    public function getFieldType($result, $offset) {
        if ($result) {
            $column = $result->getColumnMeta($offset);
            return $column['mysql:decl_type'];
        } else {
            return FALSE;
        }
    }

    public function getFieldsNum($result) {
        if ($result) {
            return $result->columnCount();
        } else {
            return FALSE;
        }
    }

    public function fetchRow($result) {
        if ($result) {
            return $result->fetch(PDO::FETCH_NUM);
        } else {
            return FALSE;
        }
    }

    public function fetchArray($result) {
        if ($result) {
            return $result->fetch(PDO::FETCH_ASSOC);
        } else {
            return FALSE;
        }
    }

    public function fetchBoth($result) {
        if ($result) {
            return $result->fetch(PDO::FETCH_BOTH);
        } else {
            return FALSE;
        }
    }

    public function getRowsNum($result) {
        if ($result) {
            return $result->rowCount();
        } else {
            return FALSE;
        }
    }

    public function freeRecordSet($result) {
        if ($result) {
            $result->closeCursor();
            return TRUE;
        } else {
            return FALSE;
        }
    }
    
    // Inseridas por Claudia fevereiro/2012, ImpressCMS.org
    
    /**
     * Executa uma sql e retorna o nro.
     * de linhas afetadas por update ou delete
     * Executes a sql and returns the number of rows affected by update or delete
     *
     * This is not a legacy method and should only be implemented in the new PDO class
     *
     * @todo this can be removed without breaking legacy db functionality
     *
     * @param string $sql
     * @return int - nro. de linhas afetadas ou false // number of rows affected, or FALSE
     */
    function exec($sql) {
        /*
         $row = $this->pdo->exec($sql);
        if ($row === FALSE) {
        $errorinfo = $this->pdo->errorInfo();
        icms_Event::trigger('icms_db_IConnection', 'execute', $this, array('sql' => $sql, 'errorno' => $errorinfo[1], 'error' => $errorinfo[2]));
        return FALSE;
        } else {
        icms_Event::trigger('icms_db_IConnection', 'execute', $this, array('sql' => $sql));
        return $row;
        }
        */  }
    
    /**
     * Fetch a result row as an object
     *
     * This is not a legacy method and should only be implemented in the new PDO class
     *
     * @todo this can be removed without breaking legacy db functionality
     *
     * @param resource $result
     * @param string $class
     *          O nome de classe para instanciar, definir as propriedades e retornar. Se n�o for especificado, um objeto stdClass � retornado.
     *          The name of the class to instantiate, set the properties and return. If none is specified, a stdClass object returned.
     * @param array $params
     *          Um array opcional de par�metros para passar para o construtor do objeto class_name .
     *          An optional array of parameters to pass to the constructor for class_name objects.
     * @return object Inserida por Claudia // added by Claudia (ImpressCMS)
     */
    function fetchObject($result, $class = 'stdClass', $params = array()) {
        /*
         if ($result) {
        return $result->fetchObject($class, $params);
        } else {
        return FALSE;
        }
        */
    }
    
    /**
     * perform queries from SQL dump file in a batch
     *
     * @param string $file
     *          file path to an SQL dump file
     *
     * @return bool FALSE if failed reading SQL file or TRUE if the file has been read and queries executed
     */
    public function queryFromFile($file) {
        if (FALSE !== ($fp = fopen($file, 'r'))) {
            
            $sql_queries = trim(fread($fp, filesize($file)));
            icms_db_legacy_mysql_Utility::splitSqlFile($pieces, $sql_queries);
            foreach ($pieces as $query) {
                // [0] contains the prefixed query
                // [4] contains unprefixed table name
                $prefixed_query = icms_db_mysql_Utility::prefixQuery(trim($query), $this->prefix());
                if ($prefixed_query != FALSE) {
                    $this->query($prefixed_query[0]);
                }
            }
            return TRUE;
        }
        return FALSE;
    }

    function getConnection() {
        return $this->pdo;
    }
    
    /**
     * Retrieve the MySQL server version information
     *
     * @param obj $connection
     *          MySQL database connection link
     * @return mixed
     */
    public function getServerVersion($connection = NULL) {
        if (NULL === $connection)
            $connection = $this->pdo;
        return $connection->getAttribute(PDO::ATTR_SERVER_VERSION);
    }
}