<?php
include 'datavalues.php';

class DataLayer
{
    private $host = DB_HOST;
    private $user = DB_USER;
    private $pass = DB_PASS;
    private $dbname = DB_NAME;

    private $dbh;
    private $error;

    private $stmt;

    public function __construct()
    {
        $dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
        $options = array(
                            PDO::ATTR_PERSISTENT => true,
                            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
                        );

        try
        {
                $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
        }
        catch (PDOException $e)
        {
            $this->error = $e->getMessage();
        }
    }

    public function query($query)
    {

            $this->stmt = $this->dbh->prepare($query);


    }

    public function bind($param, $value, $type = null)
    {
        if (is_null($type))
        {
            switch (true)
            {
                case is_int($value):
                    $type = PDO::PARAM_INT;
                    break;
                case is_bool($value):
                    $type = PDO::PARAM_BOOL;
                    break;
                case is_null($value):
                    $type = PDO::PARAM_NULL;
                    break;
                default:
                    $type = PDO::PARAM_STR;
            }
        }

        $this->stmt->bindValue($param, $value, $type);
    }

    public function execute()
    {
        return $this->stmt->execute();
    }

    public function resultset()
    {
        $this->execute();
        return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
    }

    public function single()
    {
        $this->execute();
        return $this->stmt->fetch(PDO::FETCH_ASSOC);
    }

    public function rowCount()
    {
        return $this->stmt->rowCount();
    }

    public function lastInsertId()
    {
        return $this->dbh->lastInsertId();
    }
}