/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
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** 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
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** 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 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include "packageuploader.h"

#include <utils/qtcassert.h>
#include <ssh/sftpchannel.h>
#include <ssh/sshconnection.h>

using namespace QSsh;

namespace RemoteLinux {
namespace Internal {

PackageUploader::PackageUploader(QObject *parent) :
    QObject(parent), m_state(Inactive), m_connection(0)
{
}

PackageUploader::~PackageUploader()
{
}

void PackageUploader::uploadPackage(SshConnection *connection,
    const QString &localFilePath, const QString &remoteFilePath)
{
    QTC_ASSERT(m_state == Inactive, return);

    setState(InitializingSftp);
    emit progress(tr("Preparing SFTP connection..."));

    m_localFilePath = localFilePath;
    m_remoteFilePath = remoteFilePath;
    m_connection = connection;
    connect(m_connection, &SshConnection::error,
            this, &PackageUploader::handleConnectionFailure);
    m_uploader = m_connection->createSftpChannel();
    connect(m_uploader.data(), &SftpChannel::initialized,
            this, &PackageUploader::handleSftpChannelInitialized);
    connect(m_uploader.data(), &SftpChannel::channelError,
            this, &PackageUploader::handleSftpChannelError);
    connect(m_uploader.data(), &SftpChannel::finished,
            this, &PackageUploader::handleSftpJobFinished);
    m_uploader->initialize();
}

void PackageUploader::cancelUpload()
{
    QTC_ASSERT(m_state == InitializingSftp || m_state == Uploading, return);

    cleanup();
}

void PackageUploader::handleConnectionFailure()
{
    if (m_state == Inactive)
        return;

    const QString errorMsg = m_connection->errorString();
    setState(Inactive);
    emit uploadFinished(tr("Connection failed: %1").arg(errorMsg));
}

void PackageUploader::handleSftpChannelError(const QString &errorMsg)
{
    QTC_ASSERT(m_state == InitializingSftp || m_state == Inactive, return);

    if (m_state == Inactive)
        return;

    setState(Inactive);
    emit uploadFinished(tr("SFTP error: %1").arg(errorMsg));
}

void PackageUploader::handleSftpChannelInitialized()
{
    QTC_ASSERT(m_state == InitializingSftp || m_state == Inactive, return);

    if (m_state == Inactive)
        return;

    const SftpJobId job = m_uploader->uploadFile(m_localFilePath,
        m_remoteFilePath, SftpOverwriteExisting);
    if (job == SftpInvalidJob) {
        setState(Inactive);
        emit uploadFinished(tr("Package upload failed: Could not open file."));
    } else {
        emit progress(tr("Starting upload..."));
        setState(Uploading);
    }
}

void PackageUploader::handleSftpJobFinished(SftpJobId, const QString &errorMsg)
{
    QTC_ASSERT(m_state == Uploading || m_state == Inactive, return);

    if (m_state == Inactive)
        return;

    if (!errorMsg.isEmpty())
        emit uploadFinished(tr("Failed to upload package: %2").arg(errorMsg));
    else
        emit uploadFinished();
    cleanup();
}

void PackageUploader::cleanup()
{
    m_uploader->closeChannel();
    setState(Inactive);
}

void PackageUploader::setState(State newState)
{
    if (m_state == newState)
        return;
    if (newState == Inactive) {
        if (m_uploader) {
            disconnect(m_uploader.data(), 0, this, 0);
            m_uploader.clear();
        }
        if (m_connection) {
            disconnect(m_connection, 0, this, 0);
            m_connection = 0;
        }
    }
    m_state = newState;
}

} // namespace Internal
} // namespace RemoteLinux