<?php

if (class_exists('mysqli')) {
    return;
}

class mysqli_result_facade {
    protected $result;
    protected $fields = array();

    public function __construct($result) {
        $this->result = $result;
    }

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

    public function fetch_fields() {
        if (count($this->fields)) {
            return $this->fields;
        }

        $i = 0;
        while ($i < mysql_num_fields($result)) {
            $this->fields[]= mysql_fetch_field($result, $i);
        }
        return $this->fields;
    }

    public function free() {
        mysql_free_result($this->result);
    }

    public function __get($name) {
        if ($name == 'num_rows') {
            return $this->num_rows();
        }
    }

    private function num_rows() {
        return mysql_num_rows($this->result);
    }
}

class mysqli {
    protected $connect;
    protected $results;

    protected function freeAllResults() {
        foreach ($this->results as $r) {
            $r->free();
        }
        $this->results = array();
    }

    protected function doQuery($stmt, $preserve = false) {
        if (!$preserve) {
            $this->freeAllResults();
        }

        error_log($stmt);

        $result = mysql_query($stmt, $this->connect);

        error_log(mysql_error($this->connect));

        if ($result !== TRUE && $result !== FALSE) {
            $result = new mysqli_result_facade($result);
        }

        $this->results[] = $result;
    }

    public function __construct($host = "localhost", $user = "root", $pass = "", $port = 3306) {
        $this->connect = mysql_connect($host, $user, $pass, $port);
        $this->results = array();
    }

    public function select_db($db) {
        return mysql_select_db($db, $this->connect);
    }

    public function multi_query($statements) {
        // transform escaped ; to token
        $statements = explode(';', str_replace('\;', '__ESCAPED_SEMI__', $statements));
        foreach ($statements as $stmt) {
            $this->doQuery(str_replace('__ESCAPED_SEMI__', '\;', $stmt), true);
        }
        return true;
    }

    public function query($statement) {
        $this->doQuery($statement);
        return (isset($this->results[0])) ? $this->results[0] : FALSE;
    }

    public function store_result() {
        return $this->results[0];
    }

    public function next_result() {
        array_shift($this->results);
    }

    public function close() {
        mysql_close($this->connect);
    }

    private function affected_rows() {
        return mysql_affected_rows($this->connect);
    }

    private function warning_count() {
        $result = $this->query('SHOW COUNT(*) WARNINGS');
        $row = $result->fetch_assoc();
        return $row['count'];
    }

    public function __get($name) {
        if ($name == 'affected_rows') {
            return $this->affected_rows();
        }
        if ($name == 'warning_count') {
            return $this->warning_count();
        }
    }

}


function mysqli_connect_errno() {

}

function mysqli_connect_error() {

}