<?php
/**
 * m_login.class.php
 * Created by Komma Mediadesign.
 * Author: mike
 * Date: 3/20/13
 */

class Login_Model extends Model
{
    public function __construct()
    {
        parent::__construct();
    }

    /*
     * This method runs the login form
     * 1. Checks if a user is found.
     * 2. Checks if the password is correct.
     * 3. Creates a login session.
     */
    public function validate()
    {
        $user = $_POST['user'];
        $pass = $_POST['pass'];

        if( ! empty($user) && ! empty($pass))
        {
            /*
             * Set data to get from the database
             */
            $fields = array('id','user','hash');
            $data = array_fill_keys($fields,'');

            /*
             * Get data from the database
             */
            $this->Db->setData($data);
            $this->Db->setTableName('kms_admin');
            $this->Db->addRule('user',$user);
            $this->Db->setScope(0,1);
            $result = $this->Db->select();

            /*
             * Check if user found
             */
            if(count($result) > 0)
            {
                /*
                 * Create hash from the entered password, and compare with the one in the database
                 * If they match its a valid login.
                 */
                $newHash = crypt($pass, $result['hash']);

                if($newHash == $result['hash'])
                {
                    $adminString = $result['id'].'_'.md5($result['hash']);
                    Session::set('admin_string',$adminString);
                    Session::set('admin_user',$user);
                    Session::set('login_time',time());
                    return true;
                }
                else
                {
                    $this->errors[] = 'User / Pass incorrect';
                }
            }
            else
            {
                $this->errors[] = 'User / Pass incorrect';
            }
        }
        else
        {
            $this->errors[] = 'Fill both fields';
        }
        return false;
    }

    public function isLoggedIn()
    {
        /*
         * Check if the string is set
         */
        if(Session::get('admin_string'))
        {
            /*
             * Check if login time hasn't expired
             */
            if(time() < (Session::get('login_time') + 3600)){
                Session::set('login_time',time());
                /*
                 * Set data to get from the database
                 */
                $fields = array('id','hash');
                $data = array_fill_keys($fields,'');

                /*
                 * Get data from the database
                 */
                $this->Db->setData($data);
                $this->Db->setTableName('kms_admin');
                $result = $this->Db->select();
                $result = $this->Db->twoDimensional($result);
                foreach($result as $row)
                {
                    $adminString = $row['id'].'_'.md5($row['hash']);
                    if($adminString == Session::get('admin_string'))
                    {
                        return true;
                    }
                }
            }
            else
            {
                $this->logOut();
            }
        }
        return false;
    }

    public function logOut()
    {
        Session::destroy('admin_string');
        Session::destroy('admin_user');
        Session::destroy('login_time');
    }
}