<?php

	class User extends BaseClass
	{
		
		public static $_IsChecked = false;
		private static $_userId = 0;
		private static $_user = null;

		////////////////
		// Properties //
		////////////////
		
		public $Id;
		public $Name;
		public $Email;
		public $Password;
		public $ActivationHash;
		public $Active;
		public $IsAdmin;
		
		public static $_primaryKey = array("Id");
		
		
		////////////////////
		// Public Methods //
		////////////////////
		public function __construct()
		{
			//set the primary key(s)
			//$this->_primaryKey[] = "Id";
			
			parent::__construct();
		}
		
		public static function Select($id)
		{
			return parent::Select($id);
		}

        /**
         * @return User[]
         */
        public static function SelectAll()
        {
            return parent::SelectAll();
        }
		
		public static function SelectByEmail($email)
		{
			return reset(parent::SelectObjects("SELECT * 
										 		FROM User 
										 		WHERE Email = '".(parent::_db()->escape($email))."'"));
		}

        public static function CheckLogin()
        {
            Session::CleanSessions();

            if(User::$_IsChecked == true)
                return User::$_userId > 0;

            //check session
            if(isset($_SESSION['sessionhash']))
            {
                //create session object
                $session = Session::SelectByHash($_SESSION['sessionhash']);

                if($session == null)
                {
                    //reset session
                    $_SESSION['sessionhash'] = '';
                    User::$_IsChecked = true;
                    return false;
                }
                else
                {
                    //refresh session
                    $_SESSION['sessionhash'] = $session->Hash;
                    $session->Refresh();
                    User::$_userId = $session->UserId;
                    User::$_user = User::Select(User::$_userId);
                    User::$_IsChecked = true;
                    return true;
                }

            }

        }

        /**
         * Get the user info of the loggedin user
         * @static
         * @return User
         * @throws Exception when not checked if there is a user logged in with CheckLogin()
         */
        public static function GetUserInfo()
        {
            if (!User::$_IsChecked || User::$_user == null)
                throw new Exception("Fatal Error: Unvalidated user info request");

            return User::$_user;
        }
		
		public static function GetSessionHash()
		{
			if(User::$_IsChecked)
				return $_SESSION["sessionhash"];
			return null;
		}
		
		public function Insert()
		{
			return parent::Insert($this);
		}
		
		public function Update()
		{
			parent::Update($this);
		}
		
		public function Delete()
		{
			parent::Delete();
		}
		
		public function Login()
		{
			$sessionHash = sha1(microtime().SALT);
			
			//create database session
			$session = new Session();
			$session->Hash = $sessionHash;
			$session->UserId = $this->Id;
			$session->IP = $_SERVER["REMOTE_ADDR"];
			$session->Time = time();
			$session->Insert();
			
			//create session with ID
			$_SESSION["sessionhash"] = $sessionHash;
		}
	}

?>