/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Network Auth module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QABSTRACTOAUTH_H
#define QABSTRACTOAUTH_H

#ifndef QT_NO_HTTP

#include <QtNetworkAuth/qoauthglobal.h>

#include <QtCore/qurl.h>
#include <QtCore/qobject.h>
#include <QtCore/qstring.h>
#include <QtCore/qvariant.h>

#include <functional>

QT_BEGIN_NAMESPACE

class QString;
class QByteArray;
class QNetworkReply;
class QNetworkRequest;
class QNetworkAccessManager;
class QAbstractOAuthReplyHandler;

class QAbstractOAuthPrivate;
class Q_OAUTH_EXPORT  QAbstractOAuth : public QObject
{
    Q_OBJECT

    Q_ENUMS(Status)
    Q_ENUMS(Stage)
    Q_ENUMS(Error)
    Q_PROPERTY(Status status  READ status NOTIFY statusChanged)
    Q_PROPERTY(QVariantMap extraTokens READ extraTokens NOTIFY extraTokensChanged)
    Q_PROPERTY(QUrl authorizationUrl
               READ authorizationUrl
               WRITE setAuthorizationUrl
               NOTIFY authorizationUrlChanged)
    Q_PROPERTY(QAbstractOAuth::ContentType contentType
               READ contentType
               WRITE setContentType
               NOTIFY contentTypeChanged)

public:
    enum class Status {
        NotAuthenticated,
        TemporaryCredentialsReceived,
        Granted,
        RefreshingToken
    };

    enum class Stage {
        RequestingTemporaryCredentials,
        RequestingAuthorization,
        RequestingAccessToken,
        RefreshingAccessToken
    };

    enum class Error {
        NoError,
        NetworkError,
        ServerError,

        OAuthTokenNotFoundError,
        OAuthTokenSecretNotFoundError,
        OAuthCallbackNotVerified
    };

    enum class ContentType {
        WwwFormUrlEncoded,
        Json
    };

    typedef std::function<void(Stage, QVariantMap*)> ModifyParametersFunction;

    virtual ~QAbstractOAuth();

    virtual QString clientIdentifier() const = 0;
    virtual void setClientIdentifier(const QString &clientIdentifier) = 0;

    virtual QString token() const = 0;
    virtual void setToken(const QString &token) = 0;

    QNetworkAccessManager *networkAccessManager() const;
    void setNetworkAccessManager(QNetworkAccessManager *networkAccessManager);

    Status status() const;

    QUrl authorizationUrl() const;
    void setAuthorizationUrl(const QUrl &url);

    QVariantMap extraTokens() const;

    QAbstractOAuthReplyHandler *replyHandler() const;
    void setReplyHandler(QAbstractOAuthReplyHandler *handler);

    Q_INVOKABLE virtual QNetworkReply *head(const QUrl &url,
                                            const QVariantMap &parameters = QVariantMap()) = 0;
    Q_INVOKABLE virtual QNetworkReply *get(const QUrl &url,
                                           const QVariantMap &parameters = QVariantMap()) = 0;
    Q_INVOKABLE virtual QNetworkReply *post(const QUrl &url,
                                            const QVariantMap &parameters = QVariantMap()) = 0;
    Q_INVOKABLE virtual QNetworkReply *deleteResource(
            const QUrl &url, const QVariantMap &parameters = QVariantMap()) = 0;

    ModifyParametersFunction modifyParametersFunction() const;
    void setModifyParametersFunction(const ModifyParametersFunction &modifyParametersFunction);

    ContentType contentType() const;
    void setContentType(ContentType contentType);

public Q_SLOTS:
    virtual void grant() = 0;

Q_SIGNALS:
    void clientIdentifierChanged(const QString &clientIdentifier);
    void tokenChanged(const QString &token);
    void statusChanged(Status status);
    void authorizationUrlChanged(const QUrl &url);
    void extraTokensChanged(const QVariantMap &tokens);
    void contentTypeChanged(ContentType contentType);

    void requestFailed(const Error error);
    void authorizeWithBrowser(const QUrl &url);
    void granted();
    void finished(QNetworkReply *reply);
    void replyDataReceived(const QByteArray &data);

protected:
    explicit QAbstractOAuth(QAbstractOAuthPrivate &, QObject *parent = nullptr);

    void setStatus(Status status);

    QString callback() const;

    virtual void resourceOwnerAuthorization(const QUrl &url, const QVariantMap &parameters);
    static QByteArray generateRandomString(quint8 length);

private:
    Q_DISABLE_COPY(QAbstractOAuth)
    Q_DECLARE_PRIVATE(QAbstractOAuth)
};

QT_END_NAMESPACE

#endif // QT_NO_HTTP

#endif // QABSTRACTOAUTH_H