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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flídr (https://github.com/mvccore/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/4.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Auth;

class User extends Virtual\User {

    /** @var bool */
    protected $autoInit = FALSE;

    /** @var \MvcCore\Session */
    protected static $session = NULL;

    /**
     * Try to get user model instance from 
     * any place by session username record 
     * if there is any or return null.
     * @return \MvcCore\Ext\Auth\User|null
     */
    public static function GetUserBySession () {
        $result = NULL;
        $session = static::getSession();
        if (!isset($session->uname)) return $result;
        $cfg = \MvcCore\Config::GetSystem();
        $allCredentials = $cfg->credentials;
        foreach ($allCredentials as & $credentials) {
            if ($credentials->username === $session->uname) {
                $result = new static();
                $result->setUp(array(
                    'UserName'  => $credentials->username,
                    'FullName'  => $credentials->fullname,
                ));
                break;
            }
        }
        return $result;
    }

    /**
     * Get user instance if the username exists and hashed password is the same
     * @param string $username
     * @param string $password 
     * @return \MvcCore\Ext\Auth\User|null
     */
    public static function Authenticate ($uniqueUserName = '', $password = '') {
        $result = NULL;
        $hashedPassword = static::GetPasswordHash($password);
        $cfg = \MvcCore\Config::GetSystem();
        $allCredentials = $cfg->credentials;
        foreach ($allCredentials as & $credentials) {
            if ($credentials->username === $uniqueUserName) {
                if ($credentials->password === $hashedPassword) {
                    $result = new static();
                    $result->setUp(array(
                        'UserName'  => $credentials->username,
                        'FullName'  => $credentials->fullname,
                    ));
                }
                break;
            }
        }
        return $result;
    }

    /**
     * Set up unique user name in session namespace
     * @param \MvcCore\Ext\Auth\User $user
     * @return void
     */
    public static function StoreInSession ($user = NULL) {
        static::GetSession()->uname = $user->UserName;
    }

    /**
     * Clear unique user name from session
     * @return void
     */
    public static function ClearFromSession () {
        static::GetSession()->Destroy();
    }

    /**
     * Get session to get/set/clear username,
     * is session is not started - start the session.
     * @return \MvcCore\Session
     */
    protected static function & getSession () {
        if (is_null(static::$session)) {
            \MvcCore::SessionStart(); // start session if not started or do nothing if session has been started already
            static::$session = \MvcCore\Session::GetNamespace(__CLASS__);
            static::$session->SetExpirationSeconds(
                \MvcCore\Ext\Auth::GetInstance()->GetConfig()->expirationSeconds
            );
        }
        return static::$session;
    }
}