<?php

class PDO_DataAccess
{
    /**
     * Database connection link
     * @var \PDO
     */
    protected $link;

    /**
     * Connection data
     *
     * @var DbConfig
     */
    protected $db_conf;


    public function __construct(PDO $pdo = null, DbConfig $config = null)
    {
        if ($pdo !== null) {
            $this->link = $pdo;
        } elseif ($config !== null) {
            self::getConnection($config);
        } else {
            throw new Exception(__METHOD__ . '::Configure your connection, please!');
        }
    }

    private function getConnection(DbConfig $config)
    {
        $pdo_dns  = 'mysql:host=' . $config->getDbHost() . ';';
        $pdo_dns .= ($config->getDbPort() ? 'port=' . $config->getDbPort() . ';' : '');

        if ($config->getSocket()) {
            $pdo_dns = 'mysql:unix_socket='.$config->getSocket().';';
        }

        $pdo_dns .= 'dbname=' . $config->getDbName();


        $pdo_options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
        if ($config->isPersistent()) {
            $pdo_options[PDO::ATTR_PERSISTENT] = true;
        }

        $this->db_conf = $config;

        $this->link = new PDO($pdo_dns, $config->getDbUser(), $config->getDbPass(), $pdo_options);
    }
}

class DbConfig
{
    /**
     * @var string
     */
    private $db_host;

    /**
     * @var string
     */
    private $db_name;

    /**
     * @var string
     */
    private $db_user;

    /**
     * @var string
     */
    private $db_pass;

    /**
     * @var string
     */
    private $table_prefix;

    /**
     * @var integer
     */
    private $db_port;

    /**
     * @var string
     */
    private $socket;

    /**
     * @var boolean
     */
    private $persistent;



    public function __construct($host, $database, $user, $pass)
    {
        $this->db_port = null; // ini_get("mysqli.default_port")
        // $socket = ini_get("mysqli.default_socket");

        $this->setDbHost($host);
        $this->setDbName($database);
        $this->setDbUser($user);
        $this->setDbPass($pass);
    }

    public function getDbHost()
    {
        return $this->db_host;
    }

    /**
     * @param string $db_host
     * @return dbConfig
     */
    public function setDbHost($db_host)
    {
        $this->persistent = stripos($db_host, 'p:') === 0;
        $host = $this->persistent ? substr($db_host, 2) : $db_host;

        if (strpos($host, ':') !== false) {
            list($host, $port) = explode(':', $host);

            // PHP may not honor the port number if connecting to 'localhost'
            if ($port && is_numeric($port)) {
                if (!strcasecmp($host, 'localhost'))
                    // XXX: Looks like PHP gethostbyname() is IPv4 only
                    $host = gethostbyname($host);

                $this->setDbPort($port);
            } elseif ($port) {
                $this->setSocket($port);
            }
        }

        $this->db_host = $host;

        return $this;
    }

    public function getDbName()
    {
        return $this->db_name;
    }

    /**
     * @param string $db_name
     * @return dbConfig
     */
    public function setDbName($db_name)
    {
        $this->db_name = $db_name;

        return $this;
    }

    public function getDbUser()
    {
        return $this->db_user;
    }

    /**
     * @param string $db_user
     * @return dbConfig
     */
    public function setDbUser($db_user)
    {
        $this->db_user = $db_user;

        return $this;
    }

    public function getDbPass()
    {
        return $this->db_pass;
    }

    /**
     * @param string $db_pass
     * @return dbConfig
     */
    public function setDbPass($db_pass)
    {
        $this->db_pass = $db_pass;

        return $this;
    }

    public function getTablePrefix()
    {
        return $this->table_prefix;
    }

    /**
     * @param string $table_prefix
     * @return DbConfig
     */
    public function setTablePrefix($table_prefix)
    {
        $this->table_prefix = $table_prefix;

        return $this;
    }

    public function getDbPort()
    {
        return $this->db_port;
    }

    /**
     * @param int $db_port
     * @return DbConfig
     */
    public function setDbPort($db_port)
    {
        $this->db_port = (int) $db_port;

        return $this;
    }

    public function getSocket()
    {
        return $this->socket;
    }

    /**
     * @param string $socket
     * @return DbConfig
     */
    public function setSocket($socket)
    {
        $this->socket = $socket;

        return $this;
    }

    public function isPersistent()
    {
        return $this->persistent;
    }
}