/****************************************************************************
 **
 ** BSD 3-Clause License.  See LICENSE for full text.
 ** Copyright (c) 2021 Open Mobile Platform LLC.
 ** All rights reserved.
 **
 ****************************************************************************/

 #include <oauth2.h>
 #include <redirectlistener.h>

 #include <QtCore/QByteArray>
 #include <QtCore/QString>

 #include <QtNetwork/QNetworkAccessManager>
 #include <QtNetwork/QNetworkRequest>
 #include <QtNetwork/QNetworkReply>

 #include <QtGui/QGuiApplication>
 #include <QtGui/QDesktopServices>

 #include <QtDebug>

 using namespace Amber::Web::Authorization;

 int Q_DECL_EXPORT main(int argc, char *argv[])
 {
     QGuiApplication app(argc, argv);

     QNetworkAccessManager qnam;
     OAuth2 oauth2;
     RedirectListener listener;

     QObject::connect(&listener, &RedirectListener::failed,
                      &app, [&app, &listener]() {
         qWarning() << "Listener failed to listen!";
         app.quit();
     });

     QObject::connect(&oauth2, &OAuth2::errorChanged,
                      &app, [&app, &oauth2]() {
         qWarning() << "Error! " << oauth2.error().code() << ":" << oauth2.error().message();
         app.quit();
     });

     QObject::connect(&listener, &RedirectListener::uriChanged,
                      &app, [&app, &listener, &oauth2]() {
         qDebug() << "Listening for redirects on uri:" << listener.uri();
         oauth2.setRedirectUri(listener.uri());
         QDesktopServices::openUrl(oauth2.generateAuthorizationUrl());
     });

     QObject::connect(&listener, &RedirectListener::receivedRedirect,
                      &app, [&app, &listener, &oauth2](const QString &redirectUri) {
         const QVariantMap data = oauth2.parseRedirectUri(redirectUri);
         if (!data.value("code").toString().isEmpty()) {
             qDebug() << "Received auth code, about to request access token";
             oauth2.setCustomParameters(QVariantMap());
             oauth2.requestAccessToken(data.value("code").toString(),
                                       data.value("state").toString());
         } else {
             qWarning() << "Unable to parse authorization code from redirect: " << redirectUri;
             app.quit();
         }
     });

     QObject::connect(&oauth2, &OAuth2::receivedAccessToken,
                      &app, [&app, &listener, &oauth2, &qnam](const QVariantMap &token) {
         qDebug() << "Received access token: " << token.value("access_token").toString();
         listener.stopListening();

         QUrl url(QStringLiteral("https://www.googleapis.com/oauth2/v2/userinfo"));
         QNetworkRequest request(url);
         request.setRawHeader(QString(QLatin1String("Authorization")).toUtf8(),
                              QString(QLatin1String("Bearer ") + token.value("access_token").toString()).toUtf8());
         QNetworkReply *reply = qnam.get(request);
         if (!reply) {
             qWarning() << "Failed to perform authenticated request";
             app.quit();
             return;
         }

         qDebug() << "Performing authenticated request";
         QObject::connect(reply, &QNetworkReply::finished,
                          &app, [&app, &listener, &oauth2, reply]() {
             reply->deleteLater();
             if (reply->error() != QNetworkReply::NoError) {
                 qWarning() << "Authenticated request error: " << reply->errorString()
                            << " : " << reply->readAll();
             } else {
                 qDebug() << reply->readAll();
             }
             app.quit();
         });
     });

     oauth2.setClientId(QString());      // enter your app's clientId here
     oauth2.setClientSecret(QString());  // enter your app's clientSecret here
     oauth2.setTokenEndpoint("https://accounts.google.com/o/oauth2/token");
     oauth2.setAuthorizationEndpoint("https://accounts.google.com/o/oauth2/auth");
     oauth2.setScope("https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile");
     oauth2.setState(oauth2.generateState());
     oauth2.setCodeVerifier(oauth2.generateCodeVerifier());

     listener.startListening();
     return app.exec();
 }