<?php

session_name ('freepost');
session_start ();

class Session {
    public static function is_valid ()
    {
        return isset ($_SESSION) && !is_null ($_SESSION) && !empty ($_SESSION);
    }
    
    public static function get_user ()
    {
        if (self::is_valid ())
            return $_SESSION['user'];
        else
            return NULL;
    }
    
    public static function get_username ()
    {
        if (self::is_valid ())
            return $_SESSION['user']['name'];
        else
            return '';
    }
    
    public static function get_userid ()
    {
        if (self::is_valid ())
            return $_SESSION['user']['id'];
        else
            return '';
    }
    
    /**
     * Set user information to the session
     * 
     * @param user Associative array of user properties
     */
    public static function set ($user)
    {
        $_SESSION = array (
            'user' => array (
                'id'         => $user['id'],
                'hash_id'    => $user['hashId'],
                'email'      => $user['email'],
                'registered' => $user['registered'],
                'name'       => $user['username'],
                'about'      => $user['about']));
    }
    
    /**
     * Set user information to the session.
     * This is like "set ($user)", but instead of $user we are given
     * a single property.
     */
    public static function set_property ($property, $value)
    {
        $_SESSION['user'][$property] = $value;
    }
    
    public static function delete ()
    {
        unset ($_SESSION);
        session_destroy ();
        
        $_SESSION = NULL;
    }
}