<?php

namespace app\services\openid;

use app\models\CmsRoles;
use app\models\UserAdminGlobal;
use app\models\UserPartner;
use app\models\UserSession;
use app\services\Auth;

class OpenIdService
{

    private $client_id;
    private $client_secret;
    private $redirect_uri;
    private $metadata_url;
    private $locale_from_portal;

    public function __construct()
    {
        $this->locale_from_portal = !empty($_GET['lg']) ? '?lg=' . $_GET['lg'] : '' ;
        $this->redirect_uri = \Yii::$app->params['cms'] . '/partner-register-login/'.$this->locale_from_portal;
        $this->metadata_url = \Yii::$app->params['id_server'] . '/realms/nasledstvo.bg/.well-known/openid-configuration';
        $this->client_id = \Yii::$app->params['id_server_client_id'];
        $this->client_secret = \Yii::$app->params['id_server_client_secret'];
    }

    public function authenticationServerCheckout($isAdmin = false)
    {
        if ($isAdmin) {
            $this->redirect_uri = \Yii::$app->params['cms'] . '/admin-register-login/'.$this->locale_from_portal;
        }
        $metadata = $this->http($this->metadata_url);
        if (!isset($_GET['code'])) {
            $_SESSION['state'] = bin2hex(random_bytes(5));
            $_SESSION['code_verifier'] = bin2hex(random_bytes(50));
            $code_challenge = $this->base64_urlencode(hash('sha256', $_SESSION['code_verifier'], true));
            $authorize_url = $metadata->authorization_endpoint . '?' . http_build_query([
                    'response_type' => 'code',
                    'client_id' => $this->client_id,
                    'redirect_uri' => $this->redirect_uri,
                    'state' => $_SESSION['state'],
                    'scope' => 'openid profile',
                    'code_challenge' => $code_challenge,
                    'code_challenge_method' => 'S256',
                ]);
            header("Location: $authorize_url");
            exit;
        } else {

            if ($_SESSION['state'] != $_GET['state']) {
                die('Authorization server returned an invalid state parameter');
            }

            if (isset($_GET['error'])) {
                die('Authorization server returned an error: ' . htmlspecialchars($_GET['error']));
            }

            $response = $this->http($metadata->token_endpoint, [
                'grant_type' => 'authorization_code',
                'code' => $_GET['code'],
                'redirect_uri' => $this->redirect_uri,
                'client_id' => $this->client_id,
                'client_secret' => $this->client_secret,
                'code_verifier' => $_SESSION['code_verifier'],
            ]);

            if (!isset($response->access_token)) {
                die('Error fetching access token');
            }

            $userinfo = $this->http($metadata->userinfo_endpoint, [
                'access_token' => $response->access_token,
            ]);

            if (!empty($userinfo->groups_user) && in_array('public_user', $userinfo->groups_user)) {
                header('Location: ' . \Yii::$app->params['portal'] . '/bg/user/wrong-user/');
                exit;
            }
            if(!empty($_GET['lg'])) {
                setcookie('cookie_lg', $_GET['lg'], time() + (86400 * 30), "/");
            } else {
                if (!empty($userinfo->locale)) {
                    if ($userinfo->locale == 'bg' || $userinfo->locale == 'en') {
                        setcookie('cookie_lg', $userinfo->locale, time() + (86400 * 30), "/");
                    }
                } else {
                    setcookie('cookie_lg', 'bg', time() + (86400 * 30), "/");
                }
            }
            //echo json_encode($userinfo);
           // exit;


            if (empty($userinfo->sub))
                die('sub is empty');

            //echo json_encode($response);
            //exit;

            if (!empty($userinfo->sub)) {

                if (!empty($userinfo->realm_access)) {
                    if (!empty($userinfo->realm_access->roles)) {
                        if (in_array('cms-partner-admin', $userinfo->realm_access->roles)) {
                            //exit;
                            if (empty($userinfo->partner_id))
                                die('missing parameter: partner_id');
                            $_SESSION['id_token_hint'] = $response->id_token;
                            //Login as partner user
                            UserSession::log('partner-admin', 2, $userinfo->sub);
                            UserPartner::prepareRegisterUser($userinfo, 1);
                        } else if (in_array('cms-partner-editor', $userinfo->realm_access->roles)) {
                            //exit;
                            if (empty($userinfo->partner_id))
                                die('missing parameter: partner_id');
                            $_SESSION['id_token_hint'] = $response->id_token;
                            //Login as partner user
                            UserSession::log('partner-editor', 2, $userinfo->sub);
                            UserPartner::prepareRegisterUser($userinfo, 2);
                        } else if (in_array('cms-super-admin', $userinfo->realm_access->roles)) {

                            $_SESSION['id_token_hint'] = $response->id_token;
                            //Login as global administrator
                            UserSession::log('admin', 2, $userinfo->sub);
                            UserAdminGlobal::prepareRegisterUser($userinfo);
                        } else {
                            require_once __DIR__ . '/access_denied_page.php';
                            exit;
                        }
                    }
                }
            }
            echo 'Error: Some parameters are missing';
            exit;
        }
    }


    private function http($url, $params = false)
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        if ($params)
            curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
        return json_decode(curl_exec($ch));
    }

    private function base64_urlencode($string)
    {
        return rtrim(strtr(base64_encode($string), '+/', '-_'), '=');
    }
}