/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2015-06-21
 * Description : a kipi plugin to export images to Google-Drive web service
 *
 * Copyright (C) 2015 by Shourya Singh Gupta <shouryasgupta at gmail dot com>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * ============================================================ */

#ifndef AUTHORIZE_H
#define AUTHORIZE_H

// Qt includes

#include <QList>
#include <QString>
#include <QObject>
#include <QStringList>
#include <QDialog>
#include <QNetworkReply>
#include <QNetworkAccessManager>

namespace KIPIGoogleServicesPlugin
{

class Authorize : public QObject
{
    Q_OBJECT

public:

    Authorize(QWidget* const parent, const QString& scope);
    ~Authorize();

Q_SIGNALS:

    void signalBusy(bool val);
    void signalAccessTokenFailed(int errCode, const QString& errMsg);
    void signalAccessTokenObtained();
    void signalTextBoxEmpty();
    void signalRefreshTokenObtained(const QString& msg);

private Q_SLOTS:

    void slotAuthFinished(QNetworkReply* reply);
    void slotAccept();
    void slotReject();

public:

    void doOAuth();
    void getAccessToken();
    void getAccessTokenFromRefreshToken(const QString& msg);
    bool authenticated();

    QString     getValue(const QString&, const QString&);
    QStringList getParams(const QString&, const QStringList&, const QString&);
    QString     getToken(const QString&, const QString&, const QString&);
    int         getTokenEnd(const QString&, int);

private:

    void parseResponseAccessToken(const QByteArray& data);
    void parseResponseRefreshToken(const QByteArray& data);

private:

    enum Auth_State
    {
        GD_ACCESSTOKEN=0,
        GD_REFRESHTOKEN
    };

protected:

    QWidget*               m_parent;

    QString                m_scope;
    QString                m_redirect_uri;
    QString                m_response_type;
    QString                m_client_id;
    QString                m_client_secret;
    QString                m_access_token;
    QString                m_refresh_token;
    QString                m_code;

    QString                m_token_uri;

    QString                m_bearer_access_token;
    QByteArray             m_buffer;

    QNetworkReply*         m_reply;

    Auth_State             m_Authstate;
    int                    m_continuePos;

private:

    QDialog*               m_window;

    QNetworkAccessManager* m_netMngr;
};

} // namespace KIPIGoogleServicesPlugin

#endif /* AUTHORIZE_H */
