/* Copyright (C) 2017
 * swift project Community / Contributors
 *
 * This file is part of swift Project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
 * including this file, may be copied, modified, propagated, or distributed except according to the terms
 * contained in the LICENSE file.
 */

//! \file

#ifndef BLACKGUI_COMPONENTS_DOWNLOADCOMPONENT_H
#define BLACKGUI_COMPONENTS_DOWNLOADCOMPONENT_H

#include "blackgui/blackguiexport.h"
#include "blackgui/overlaymessagesframe.h"
#include "blackgui/loadindicator.h"
#include "blackmisc/network/remotefilelist.h"

#include <QNetworkReply>
#include <QFileDialog>
#include <QWizard>
#include <QScopedPointer>
#include <QFlags>

namespace Ui { class CDownloadComponent; }
namespace BlackGui
{
    namespace Components
    {
        /**
         * Download a file
         */
        class BLACKGUI_EXPORT CDownloadComponent :
            public COverlayMessagesFrame,
            public CLoadIndicatorEnabled
        {
            Q_OBJECT

        public:
            //! How to run
            enum ModeFlag
            {
                JustDownload,       //!< download, that's it
                StartAfterDownload, //!< download, then install
                ShutdownSwift,      //!< for installers, stop swift before running
                SwiftInstaller = StartAfterDownload | ShutdownSwift
            };
            Q_DECLARE_FLAGS(Mode, ModeFlag)

            //! Default constructor
            explicit CDownloadComponent(QWidget *parent = nullptr);

            //! Dtor
            virtual ~CDownloadComponent();

            //! Set file to be downloaded
            bool setDownloadFile(const BlackMisc::Network::CRemoteFile &remoteFile);

            //! Set files to be downloaded
            bool setDownloadFiles(const BlackMisc::Network::CRemoteFileList &remoteFiles);

            //! Set donwload directory
            bool setDownloadDirectory(const QString &path);

            //! Trigger downloading of the file
            bool triggerDownloadingOfFiles(int delayMs = -1);

            //! Downloads in progress
            bool isDownloading() const;

            //! Have all downloads completed?
            bool haveAllDownloadsCompleted() const;

            //! Get the mode
            Mode getMode() const;

            //! Set the mode
            void setMode(Mode mode);

            //! Clear all values
            void clear();

            //! Cancel ongoing downloads
            void cancelOngoingDownloads();

        signals:
            //! All downloads have been completed
            void allDownloadsCompleted();

        private:
            static constexpr int OverlayMsgTimeoutMs = 5000; //!< how long overlay is displayed
            QScopedPointer<Ui::CDownloadComponent> ui;
            const QFileDialog::Options m_fileDialogOptions { QFileDialog::ShowDirsOnly | QFileDialog::ReadOnly | QFileDialog::DontResolveSymlinks };
            BlackMisc::Network::CRemoteFile m_fileInProgress;  //!< file currently downloading
            BlackMisc::Network::CRemoteFileList m_remoteFiles; //!< files for download
            BlackMisc::Network::CRemoteFileList m_waitingForDownload; //!< files currently waiting for download
            QNetworkReply *m_reply = nullptr;

            //! Select download directory
            void selectDownloadDirectory();

            //! Trigger the download of the next file
            bool triggerDownloadingOfNextFile();

            //! Trigger downloading of the file
            bool triggerDownloadingOfFile(const BlackMisc::Network::CRemoteFile &remoteFile);

            //! Downloaded file
            void downloadedFile(const BlackMisc::CStatusMessage &status);

            //! Last file was downloaded
            void lastFileDownloaded();

            //! Start download
            void startDownloadedExecutable();

            //! Is the download dir existing?
            bool existsDownloadDir() const;

            //! Show download dir
            void openDownloadDir();

            //! Reset the download directory
            void resetDownloadDir();

            //! Show started file download
            void showStartedFileMessage(const BlackMisc::Network::CRemoteFile &rf);

            //! Show completed file download
            void showCompletedFileMessage(const BlackMisc::Network::CRemoteFile &rf);

            //! Download progress
            void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);

            //! File info
            void showFileInfo();
        };
    } // ns
} // ns

Q_DECLARE_METATYPE(BlackGui::Components::CDownloadComponent::Mode)
Q_DECLARE_METATYPE(BlackGui::Components::CDownloadComponent::ModeFlag)
Q_DECLARE_OPERATORS_FOR_FLAGS(BlackGui::Components::CDownloadComponent::Mode)

#endif // guard