<?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;

use PDO;
use Doctrine\DBAL\Types\Type;
use Doctrine\DBAL\Driver\Statement as DriverStatement;

/**
 * A thin wrapper around a Doctrine\DBAL\Driver\Statement that adds support
 * for logging, DBAL mapping types, etc.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
class Statement implements \IteratorAggregate, DriverStatement
{

    /**
     * The SQL statement.
     *
     * @var string
     */
    protected $sql;

    /**
     * The bound parameters.
     *
     * @var array
     */
    protected $params = array();

    /**
     * The parameter types.
     *
     * @var array
     */
    protected $types = array();

    /**
     * The underlying driver statement.
     *
     * @var \Doctrine\DBAL\Driver\Statement
     */
    protected $stmt;

    /**
     * The underlying database platform.
     *
     * @var \Doctrine\DBAL\Platforms\AbstractPlatform
     */
    protected $platform;

    /**
     * The connection this statement is bound to and executed on.
     *
     * @var \Doctrine\DBAL\Connection
     */
    protected $conn;

    /**
     * Creates a new <tt>Statement</tt> for the given SQL and <tt>Connection</tt>.
     *
     * @param string $sql
     *            The SQL of the statement.
     * @param \Doctrine\DBAL\Connection $conn
     *            The connection on which the statement should be executed.
     */
    public function __construct($sql, Connection $conn)
    {
        $this->sql = $sql;
        $this->stmt = $conn->getWrappedConnection()->prepare($sql);
        $this->conn = $conn;
        $this->platform = $conn->getDatabasePlatform();
    }

    /**
     * Binds a parameter value to the statement.
     *
     * The value can optionally be bound with a PDO binding type or a DBAL mapping type.
     * If bound with a DBAL mapping type, the binding type is derived from the mapping
     * type and the value undergoes the conversion routines of the mapping type before
     * being bound.
     *
     * @param string $name
     *            The name or position of the parameter.
     * @param mixed $value
     *            The value of the parameter.
     * @param mixed $type
     *            Either a PDO binding type or a DBAL mapping type name or instance.
     *            
     * @return boolean TRUE on success, FALSE on failure.
     */
    public function bindValue($name, $value, $type = null)
    {
        $this->params[$name] = $value;
        $this->types[$name] = $type;
        if ($type !== null) {
            if (is_string($type)) {
                $type = Type::getType($type);
            }
            if ($type instanceof Type) {
                $value = $type->convertToDatabaseValue($value, $this->platform);
                $bindingType = $type->getBindingType();
            } else {
                $bindingType = $type; // PDO::PARAM_* constants
            }
            
            return $this->stmt->bindValue($name, $value, $bindingType);
        } else {
            return $this->stmt->bindValue($name, $value);
        }
    }

    /**
     * Binds a parameter to a value by reference.
     *
     * Binding a parameter by reference does not support DBAL mapping types.
     *
     * @param string $name
     *            The name or position of the parameter.
     * @param mixed $var
     *            The reference to the variable to bind.
     * @param integer $type
     *            The PDO binding type.
     * @param integer|null $length
     *            Must be specified when using an OUT bind
     *            so that PHP allocates enough memory to hold the returned value.
     *            
     * @return boolean TRUE on success, FALSE on failure.
     */
    public function bindParam($name, &$var, $type = PDO::PARAM_STR, $length = null)
    {
        $this->params[$name] = $var;
        $this->types[$name] = $type;
        
        return $this->stmt->bindParam($name, $var, $type, $length);
    }

    /**
     * Executes the statement with the currently bound parameters.
     *
     * @param array|null $params
     *
     * @return boolean TRUE on success, FALSE on failure.
     *        
     * @throws \Doctrine\DBAL\DBALException
     */
    public function execute($params = null)
    {
        if (is_array($params)) {
            $this->params = $params;
        }
        
        $logger = $this->conn->getConfiguration()->getSQLLogger();
        if ($logger) {
            $logger->startQuery($this->sql, $this->params, $this->types);
        }
        
        try {
            $stmt = $this->stmt->execute($params);
        } catch (\Exception $ex) {
            if ($logger) {
                $logger->stopQuery();
            }
            throw DBALException::driverExceptionDuringQuery($this->conn->getDriver(), $ex, $this->sql, $this->conn->resolveParams($this->params, $this->types));
        }
        
        if ($logger) {
            $logger->stopQuery();
        }
        $this->params = array();
        $this->types = array();
        
        return $stmt;
    }

    /**
     * Closes the cursor, freeing the database resources used by this statement.
     *
     * @return boolean TRUE on success, FALSE on failure.
     */
    public function closeCursor()
    {
        return $this->stmt->closeCursor();
    }

    /**
     * Returns the number of columns in the result set.
     *
     * @return integer
     */
    public function columnCount()
    {
        return $this->stmt->columnCount();
    }

    /**
     * Fetches the SQLSTATE associated with the last operation on the statement.
     *
     * @return string
     */
    public function errorCode()
    {
        return $this->stmt->errorCode();
    }

    /**
     * Fetches extended error information associated with the last operation on the statement.
     *
     * @return array
     */
    public function errorInfo()
    {
        return $this->stmt->errorInfo();
    }

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

    /**
     * Required by interface IteratorAggregate.
     *
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return $this->stmt;
    }

    /**
     * Fetches the next row from a result set.
     *
     * @param integer|null $fetchMode
     *
     * @return mixed The return value of this function on success depends on the fetch type.
     *         In all cases, FALSE is returned on failure.
     */
    public function fetch($fetchMode = null)
    {
        return $this->stmt->fetch($fetchMode);
    }

    /**
     * Returns an array containing all of the result set rows.
     *
     * @param integer|null $fetchMode
     * @param mixed $fetchArgument
     *
     * @return array An array containing all of the remaining rows in the result set.
     */
    public function fetchAll($fetchMode = null, $fetchArgument = 0)
    {
        if ($fetchArgument !== 0) {
            return $this->stmt->fetchAll($fetchMode, $fetchArgument);
        }
        
        return $this->stmt->fetchAll($fetchMode);
    }

    /**
     * Returns a single column from the next row of a result set.
     *
     * @param integer $columnIndex
     *
     * @return mixed A single column from the next row of a result set or FALSE if there are no more rows.
     */
    public function fetchColumn($columnIndex = 0)
    {
        return $this->stmt->fetchColumn($columnIndex);
    }

    /**
     * Returns the number of rows affected by the last execution of this statement.
     *
     * @return integer The number of affected rows.
     */
    public function rowCount()
    {
        return $this->stmt->rowCount();
    }

    /**
     * Gets the wrapped driver statement.
     *
     * @return \Doctrine\DBAL\Driver\Statement
     */
    public function getWrappedStatement()
    {
        return $this->stmt;
    }
}
