<?php

namespace app\controllers;

use Registry;
use UserManager;
use User;
use app\models\user\User_model;


/** class Auth
 * 
 * handles user's Authentication and Authorizarion
 * 
 */
class Auth {

    /** login
     * 
     * checks visitor's credentials;
     * if valid, authenticates user
     * 
     */
    public static function login()
    {
        $req = Registry::get('REQUEST');

        // get the record of the target user
        $record = User_model::checkUser('email', $req->POST['email']);
       
        // if no user exists, return false
        if ($record === false)     return false;
       
        // create a user object
        $user = (new User())
            ->setUserName($record['email'])
            ->setPassword($record['password'])
            ->setRoles(json_decode($record['roles']))
            ->setEnabled($record['active']);

        // let user manager to validate user credentials
        $userManager = new UserManager();
        
        if ($userManager->isPasswordValid($user, $req->POST['password'])) {
    
            // login OK, set Token in session
            $userManager->createUserToken($user);
    
        } else {
            return false;
        }
    }


    /** register
     * 
     * registers new user
     * 
     */
    public static function register()
    {
        $userManager = new UserManager();
        $req = Registry::get('REQUEST');

        // create a salted password hash
        $password = $userManager->cryptPassword($req->POST['password']);
        
        $user = (new User())
            ->setUserName($req->POST['username'])
            ->setPassword($password)
            ->setRoles(['ROLE_USER']);

        // TODO:
        // store user to database

        $userManager->createUserToken($user);
    }


    public static function logout()
    {
        $userManager = new UserManager();
        $userManager->logout();
    }


    /** isGranted( ROLE )
     * 
     * checks if the user is granted (some of) the specified role(s)
     * to access the source
     * 
     * NOTE:
     * if no roles are specified then user is granted
     * (because every user is granted the 'no-role')
     * 
     * @param $roles (array): array of roles to check (if any is granted)
     * 
     */
    public static function isGranted($roles = [])
    {
        // no role required ? user is granted access
        if ($roles == [])   return true;

        // else, UserManager knows if user isGranted
        $userManager = new UserManager();
        if ($userManager->isGranted($roles)) {
            return true;

        } else {
            return false;
        }
    }


    /** hasPermition( PERMIT )
     * 
     * checks if the user owns the specified permition
     * to access the source
     * 
     */
    public static function hasPermition($permit = [])
    {
        if ($permit == [])    return true;
    }


    /** isAuthenticated()
     * 
     * chechs if the user's roles and permitions
     * satisfy the specified requirements 
     * to access the source
     * 
     * @param $requirements (array of rules-array)
     * 
     * example:
     * [
     *    [
     *       role => ['editor','designer']
     *       permition => ['10', '12', '18']
     *    ],
     *    [
     *       role => ['admin' , 'developερ']
     *    ],
     *    [
     *       permition => [ 3 ]
     *    ]
     * ]
     * 
     * defines (and parses to) a requirements rule of:
     * [
     *    user should be editor or designer
     *    and have permition 10 or 12 or 18
     * ]
     * OR
     * [
     *    user should be an administratoe or developer
     * ]
     * OR
     * [
     *    user should have permition #3
     * ]
     *
     * 
     */
    public static function isAuthorized($requirements)
    {
        $authorized = false;
        foreach($requirements as $required) {
            if ( (self::isGranted($required['role'] ?? []))
            && (self::hasPermition($required['permition'] ?? [])) ) {
                $authorized = true;
            }
        }
        return $authorized;
    }


    public static function forgot_pass()
    {
    }


    public static function validate_otp()
    {
    }


}