<?php namespace Majestic\Model;
/**
 * @copyright NetMonsters <team@netmonsters.ru>
 * @link http://netmonsters.ru
 * @package Majestic
 * @subpackage db
 * @since 2010-02-19
 */

/**
 * @property MySQLiDriver $driver
 * @property \MySQLi_Result $result
 */
class MySQLiStatement extends DbStatement
{

    protected $map = null;

    public function bindParam($param, &$value)
    {
        if ($this->map === null) {
            $this->mapPlaceholders();
        }
        if (is_array($this->map) && count($this->map) > 0) {
            if (!is_string($param) && !is_int($param)) {
                throw new \Majestic\Exception\GeneralException('Placeholder must be an integer or string');
            }
            if (is_object($value) && ! ($value instanceof DbExpr)) {
                throw new \Majestic\Exception\GeneralException('Objects excepts DbExpr not allowed.');
            }
            if (isset($this->map[$param])) {
                $this->params[$param] = &$value;
                return true;
            }
        }
        return false;
    }
    protected function mapPlaceholders()
    {
        $matches = array();
        if(preg_match_all('/(\?|:[A-z][A-z0-9_]*+)/u', $this->request, $matches, PREG_OFFSET_CAPTURE)) {
            $noname = 0;
            foreach ($matches[0] as $id=>$match) {
                $match[2] = $matches[1][$id][0];
                $name = ($match[2][0] === ':') ? ltrim($match[2], ':') : $noname++;
                $this->map[$name]['placeholder'] = $match[0];
                $this->map[$name]['offset'][]    = $match[1];
            }
        }
    }

    protected function assemble()
    {
        if (empty($this->map)) {
            return $this->request;
        }

        $query = $this->request;
        $placeholders = array();
        foreach($this->map as $name => $place) {
            $value = $this->driver->quote($this->params[$name]);
            foreach ($place['offset'] as $offset) {
                $placeholders[$offset] = array('placeholder' => $place['placeholder'], 'value' => $value);
            }
        }

        ksort($placeholders);

        $increment = 0;
        foreach($placeholders as $current_offset => $placeholder) {
            $offset = $current_offset + $increment;
            $length = mb_strlen($placeholder['placeholder']);
            $query = mb_substr($query, 0, $offset) . $placeholder['value'] . mb_substr($query, $offset + $length);
            $increment = (($increment - $length) + mb_strlen($placeholder['value']));
        }
        return $query;
    }

    /**
     * Fetches single row
     *
     * @param mixed $style
     * @return mixed
     * @throws \Majestic\Exception\GeneralException
     */
    public function fetch($style = Db::FETCH_OBJ)
    {
        if (!$this->result) {
            return false;
        }

        switch ($style) {
            case Db::FETCH_OBJ:
                $row = $this->result->fetch_object();
            break;
            case Db::FETCH_NUM:
                $row = $this->result->fetch_array(MYSQLI_NUM);
            break;
            case Db::FETCH_ASSOC:
                $row = $this->result->fetch_assoc();
            break;
            case Db::FETCH_BOTH:
                $row = $this->result->fetch_array(MYSQLI_BOTH);
            break;
            default:
                throw new \Majestic\Exception\GeneralException('Invalid fetch mode "' . $style . '" specified');
        }
        return $row;
    }

    /**
     * @param string $class
     * @return object
     */
    public function fetchObject($class = 'stdClass')
    {
        return $this->result->fetch_object($class);
    }

    /**
     * @return array
     */
    public function fetchPairs()
    {
        $data = array();
        while ($row = $this->fetch(Db::FETCH_NUM)) {
            $data[$row[0]] = $row[1];
        }
        return $data;
    }

    public function close()
    {
        if ($this->result !== null) {
            $this->result->close();
            $this->result = null;
        }
    }

    public function affectedRows()
    {
        return $this->driver->getConnection()->affected_rows;
    }

    public function numRows()
    {
        if ($this->result) {
            return $this->result->num_rows;
        }
        return false;
    }

    public function getMysqliResult()
    {
        return $this->result;
    }

    protected function driverExecute($request)
    {
        /**
         * @var \MySQLi
         */
        $mysqli = $this->driver->getConnection();
        if (\Majestic\Config::get('PROFILER_DETAILS')) {
            $profiler = \Majestic\Util\Profiler\Profiler::getInstance()->profilerCommand('MySQL', $request);
            $result = $mysqli->query($request);
            $profiler->end();
        } else {
            $result = $mysqli->query($request);
        }
        if ($result === false) {
            $message = $mysqli->error . "\nQuery: \"" . $request . '"';
            throw new \Majestic\Exception\GeneralException($message, $mysqli->errno);
        }
        if ($result instanceof \MySQLi_Result) {
            $this->result = $result;
        }
        return true;
    }
}