<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\DBAL\Driver\IBMDB2;

use \Doctrine\DBAL\Driver\Statement;

class DB2Statement implements \IteratorAggregate, Statement
{
    /**
     * @var resource
     */
    private $_stmt = null;

    /**
     * @var array
     */
    private $_bindParam = array();

    /**
     * @var integer
     */
    private $_defaultFetchMode = \PDO::FETCH_BOTH;

    /**
     * DB2_BINARY, DB2_CHAR, DB2_DOUBLE, or DB2_LONG
     *
     * @var array
     */
    static private $_typeMap = array(
        \PDO::PARAM_INT => DB2_LONG,
        \PDO::PARAM_STR => DB2_CHAR,
    );

    /**
     * @param resource $stmt
     */
    public function __construct($stmt)
    {
        $this->_stmt = $stmt;
    }

    /**
     * {@inheritdoc}
     */
    public function bindValue($param, $value, $type = null)
    {
        return $this->bindParam($param, $value, $type);
    }

    /**
     * {@inheritdoc}
     */
    public function bindParam($column, &$variable, $type = null, $length = null)
    {
        $this->_bindParam[$column] =& $variable;

        if ($type && isset(self::$_typeMap[$type])) {
            $type = self::$_typeMap[$type];
        } else {
            $type = DB2_CHAR;
        }

        if (!db2_bind_param($this->_stmt, $column, "variable", DB2_PARAM_IN, $type)) {
            throw new DB2Exception(db2_stmt_errormsg());
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function closeCursor()
    {
        if ( ! $this->_stmt) {
            return false;
        }

        $this->_bindParam = array();
        db2_free_result($this->_stmt);
        $ret = db2_free_stmt($this->_stmt);
        $this->_stmt = false;

        return $ret;
    }

    /**
     * {@inheritdoc}
     */
    public function columnCount()
    {
        if ( ! $this->_stmt) {
            return false;
        }

        return db2_num_fields($this->_stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function errorCode()
    {
        return db2_stmt_error();
    }

    /**
     * {@inheritdoc}
     */
    public function errorInfo()
    {
        return array(
            0 => db2_stmt_errormsg(),
            1 => db2_stmt_error(),
        );
    }

    /**
     * {@inheritdoc}
     */
    public function execute($params = null)
    {
        if ( ! $this->_stmt) {
            return false;
        }

        /*$retval = true;
        if ($params !== null) {
            $retval = @db2_execute($this->_stmt, $params);
        } else {
            $retval = @db2_execute($this->_stmt);
        }*/
        if ($params === null) {
            ksort($this->_bindParam);
            $params = array_values($this->_bindParam);
        }
        $retval = @db2_execute($this->_stmt, $params);

        if ($retval === false) {
            throw new DB2Exception(db2_stmt_errormsg());
        }

        return $retval;
    }

    /**
     * {@inheritdoc}
     */
    public function setFetchMode($fetchMode, $arg2 = null, $arg3 = null)
    {
        $this->_defaultFetchMode = $fetchMode;

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        $data = $this->fetchAll();

        return new \ArrayIterator($data);
    }

    /**
     * {@inheritdoc}
     */
    public function fetch($fetchMode = null)
    {
        $fetchMode = $fetchMode ?: $this->_defaultFetchMode;
        switch ($fetchMode) {
            case \PDO::FETCH_BOTH:
                return db2_fetch_both($this->_stmt);
            case \PDO::FETCH_ASSOC:
                return db2_fetch_assoc($this->_stmt);
            case \PDO::FETCH_NUM:
                return db2_fetch_array($this->_stmt);
            default:
                throw new DB2Exception("Given Fetch-Style " . $fetchMode . " is not supported.");
        }
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAll($fetchMode = null)
    {
        $rows = array();
        while ($row = $this->fetch($fetchMode)) {
            $rows[] = $row;
        }

        return $rows;
    }

    /**
     * {@inheritdoc}
     */
    public function fetchColumn($columnIndex = 0)
    {
        $row = $this->fetch(\PDO::FETCH_NUM);
        if ($row && isset($row[$columnIndex])) {
            return $row[$columnIndex];
        }

        return false;
    }

    /**
     * {@inheritdoc}
     */
    public function rowCount()
    {
        return (@db2_num_rows($this->_stmt))?:0;
    }
}
