<?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\SQLAnywhere;

use IteratorAggregate;
use PDO;
use Doctrine\DBAL\Driver\Statement;

/**
 * SAP SQL Anywhere implementation of the Statement interface.
 *
 * @author Steve Müller <st.mueller@dzh-online.de>
 * @link   www.doctrine-project.org
 * @since  2.5
 */
class SQLAnywhereStatement implements IteratorAggregate, Statement
{
    /**
     * @var resource The connection resource.
     */
    private $conn;

    /**
     * @var string Name of the default class to instantiate when fetch mode is \PDO::FETCH_CLASS.
     */
    private $defaultFetchClass = '\stdClass';

    /**
     * @var string Constructor arguments for the default class to instantiate when fetch mode is \PDO::FETCH_CLASS.
     */
    private $defaultFetchClassCtorArgs = array();

    /**
     * @var int Default fetch mode to use.
     */
    private $defaultFetchMode = PDO::FETCH_BOTH;

    /**
     * @var resource The result set resource to fetch.
     */
    private $result;

    /**
     * @var resource The prepared SQL statement to execute.
     */
    private $stmt;

    /**
     * Constructor.
     *
     * Prepares given statement for given connection.
     *
     * @param resource $conn The connection resource to use.
     * @param string   $sql  The SQL statement to prepare.
     *
     * @throws SQLAnywhereException
     */
    public function __construct($conn, $sql)
    {
        if ( ! is_resource($conn) || get_resource_type($conn) !== 'SQLAnywhere connection') {
            throw new SQLAnywhereException('Invalid SQL Anywhere connection resource: ' . $conn);
        }

        $this->conn = $conn;
        $this->stmt = sasql_prepare($conn, $sql);

        if ( ! is_resource($this->stmt) || get_resource_type($this->stmt) !== 'SQLAnywhere statement') {
            throw SQLAnywhereException::fromSQLAnywhereError($conn);
        }
    }

    /**
     * {@inheritdoc}
     *
     * @throws SQLAnywhereException
     */
    public function bindParam($column, &$variable, $type = null, $length = null)
    {
        switch ($type) {
            case PDO::PARAM_INT:
            case PDO::PARAM_BOOL:
                $type = 'i';
                break;
            case PDO::PARAM_LOB:
                $type = 'b';
                break;
            case PDO::PARAM_NULL:
            case PDO::PARAM_STR:
                $type = 's';
                break;
            default:
                throw new SQLAnywhereException('Unknown type: ' . $type);
        }

        if ( ! sasql_stmt_bind_param_ex($this->stmt, $column - 1, $variable, $type, $variable === null)) {
            throw SQLAnywhereException::fromSQLAnywhereError($this->conn, $this->stmt);
        }

        return true;
    }

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

    /**
     * {@inheritdoc}
     *
     * @throws SQLAnywhereException
     */
    public function closeCursor()
    {
        if (!sasql_stmt_reset($this->stmt)) {
            throw SQLAnywhereException::fromSQLAnywhereError($this->conn, $this->stmt);
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function columnCount()
    {
        return sasql_stmt_field_count($this->stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function errorCode()
    {
        return sasql_stmt_errno($this->stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function errorInfo()
    {
        return sasql_stmt_error($this->stmt);
    }

    /**
     * {@inheritdoc}
     *
     * @throws SQLAnywhereException
     */
    public function execute($params = null)
    {
        if (is_array($params)) {
            $hasZeroIndex = array_key_exists(0, $params);

            foreach ($params as $key => $val) {
                $key = ($hasZeroIndex && is_numeric($key)) ? $key + 1 : $key;

                $this->bindValue($key, $val);
            }
        }

        if ( ! sasql_stmt_execute($this->stmt)) {
            throw SQLAnywhereException::fromSQLAnywhereError($this->conn, $this->stmt);
        }

        $this->result = sasql_stmt_result_metadata($this->stmt);

        return true;
    }

    /**
     * {@inheritdoc}
     *
     * @throws SQLAnywhereException
     */
    public function fetch($fetchMode = null)
    {
        if ( ! is_resource($this->result) || get_resource_type($this->result) !== 'SQLAnywhere result') {
            return false;
        }

        $fetchMode = $fetchMode ?: $this->defaultFetchMode;

        switch ($fetchMode) {
            case PDO::FETCH_ASSOC:
                return sasql_fetch_assoc($this->result);
            case PDO::FETCH_BOTH:
                return sasql_fetch_array($this->result, SASQL_BOTH);
            case PDO::FETCH_CLASS:
                $className = $this->defaultFetchClass;
                $ctorArgs  = $this->defaultFetchClassCtorArgs;

                if (func_num_args() >= 2) {
                    $args      = func_get_args();
                    $className = $args[1];
                    $ctorArgs  = isset($args[2]) ? $args[2] : array();
                }

                $result = sasql_fetch_object($this->result);

                if ($result instanceof \stdClass) {
                    $result = $this->castObject($result, $className, $ctorArgs);
                }

                return $result;
            case PDO::FETCH_NUM:
                return sasql_fetch_row($this->result);
            case PDO::FETCH_OBJ:
                return sasql_fetch_object($this->result);
            default:
                throw new SQLAnywhereException('Fetch mode is not supported: ' . $fetchMode);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function fetchAll($fetchMode = null)
    {
        $rows = array();

        switch ($fetchMode) {
            case PDO::FETCH_CLASS:
                while ($row = call_user_func_array(array($this, 'fetch'), func_get_args())) {
                    $rows[] = $row;
                }
                break;
            case PDO::FETCH_COLUMN:
                while ($row = $this->fetchColumn()) {
                    $rows[] = $row;
                }
                break;
            default:
                while ($row = $this->fetch($fetchMode)) {
                    $rows[] = $row;
                }
        }

        return $rows;
    }

    /**
     * {@inheritdoc}
     */
    public function fetchColumn($columnIndex = 0)
    {
        $row = $this->fetch(PDO::FETCH_NUM);

        if (false === $row) {
            return false;
        }

        return isset($row[$columnIndex]) ? $row[$columnIndex] : null;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return new \ArrayIterator($this->fetchAll());
    }

    /**
     * {@inheritdoc}
     */
    public function rowCount()
    {
        return sasql_stmt_affected_rows($this->stmt);
    }

    /**
     * {@inheritdoc}
     */
    public function setFetchMode($fetchMode, $arg2 = null, $arg3 = null)
    {
        $this->defaultFetchMode          = $fetchMode;
        $this->defaultFetchClass         = $arg2 ? $arg2 : $this->defaultFetchClass;
        $this->defaultFetchClassCtorArgs = $arg3 ? (array) $arg3 : $this->defaultFetchClassCtorArgs;
    }

    /**
     * Casts a stdClass object to the given class name mapping its' properties.
     *
     * @param \stdClass     $sourceObject     Object to cast from.
     * @param string|object $destinationClass Name of the class or class instance to cast to.
     * @param array         $ctorArgs         Arguments to use for constructing the destination class instance.
     *
     * @return object
     *
     * @throws SQLAnywhereException
     */
    private function castObject(\stdClass $sourceObject, $destinationClass, array $ctorArgs = array())
    {
        if ( ! is_string($destinationClass)) {
            if ( ! is_object($destinationClass)) {
                throw new SQLAnywhereException(sprintf(
                    'Destination class has to be of type string or object, %s given.', gettype($destinationClass)
                ));
            }
        } else {
            $destinationClass = new \ReflectionClass($destinationClass);
            $destinationClass = $destinationClass->newInstanceArgs($ctorArgs);
        }

        $sourceReflection           = new \ReflectionObject($sourceObject);
        $destinationClassReflection = new \ReflectionObject($destinationClass);

        foreach ($sourceReflection->getProperties() as $sourceProperty) {
            $sourceProperty->setAccessible(true);

            $name  = $sourceProperty->getName();
            $value = $sourceProperty->getValue($sourceObject);

            if ($destinationClassReflection->hasProperty($name)) {
                $destinationProperty = $destinationClassReflection->getProperty($name);

                $destinationProperty->setAccessible(true);
                $destinationProperty->setValue($destinationClass, $value);
            } else {
                $destinationClass->$name = $value;
            }
        }

        return $destinationClass;
    }
}
