<?php

namespace TeamTNT\TNTSearch\Connectors;

use PDO;

class OracleDBConnector extends Connector implements ConnectorInterface {

    /**
     * The PDO connection options.
     *
     * @var array
     */
    protected $options = array(
            PDO::ATTR_CASE => PDO::CASE_NATURAL,
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL,
            PDO::ATTR_STRINGIFY_FETCHES => false,
    );

    /**
     * Establish a database connection.
     *
     * @param  array  $config
     * @return PDO
     */
    public function connect(array $config)
    {
        $options = $this->getOptions($config);

        return $this->createConnection($this->getDsn($config), $config, $options);
    }

    /**
     * Create a DSN string from a configuration.
     *
     * @param  array   $config
     * @return string
     */
    protected function getDsn(array $config)
    {
        extract($config);

        // First we will create the basic DSN setup as well as the port if it is in
        // in the configuration options. This will give us the basic DSN we will
        // need to establish the PDO connections and return them back for use.

        if (in_array('oci', $this->getAvailableDrivers()))
        {
            return "oci:dbname={$dbtns};charset=utf8";
        }
    }

    /**
     * Get the available PDO drivers.
     *
     * @return array
     */
    protected function getAvailableDrivers()
    {
        return PDO::getAvailableDrivers();
    }

}
