/*
  Copyright (c) 2014-2017 Montel Laurent <montel@kde.org>

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License, version 2, as
  published by the Free Software Foundation.

  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.

  You should have received a copy of the GNU General Public License along
  with this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "verifyopaquebodypartmemento.h"
#include "mimetreeparser_debug.h"

#include <QGpgME/VerifyOpaqueJob>
#include <QGpgME/KeyListJob>

#include <gpgme++/keylistresult.h>

#include <qstringlist.h>

#include <cassert>

using namespace QGpgME;
using namespace GpgME;
using namespace MimeTreeParser;

VerifyOpaqueBodyPartMemento::VerifyOpaqueBodyPartMemento(VerifyOpaqueJob *job,
        KeyListJob   *klj,
        const QByteArray &signature)
    : CryptoBodyPartMemento(),
      m_signature(signature),
      m_job(job),
      m_keylistjob(klj)
{
    assert(m_job);
}

VerifyOpaqueBodyPartMemento::~VerifyOpaqueBodyPartMemento()
{
    if (m_job) {
        m_job->slotCancel();
    }
    if (m_keylistjob) {
        m_keylistjob->slotCancel();
    }
}

bool VerifyOpaqueBodyPartMemento::start()
{
    assert(m_job);
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento started";
#endif
    if (const Error err = m_job->start(m_signature)) {
        m_vr = VerificationResult(err);
#ifdef DEBUG_SIGNATURE
        qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento stopped with error";
#endif
        return false;
    }
    connect(m_job, SIGNAL(result(GpgME::VerificationResult,QByteArray)),
            this, SLOT(slotResult(GpgME::VerificationResult,QByteArray)));
    setRunning(true);
    return true;
}

void VerifyOpaqueBodyPartMemento::exec()
{
    assert(m_job);
    setRunning(true);
    QByteArray plainText;
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento execed";
#endif
    saveResult(m_job->exec(m_signature, plainText), plainText);
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento after execed";
#endif
    m_job->deleteLater(); // exec'ed jobs don't delete themselves
    m_job = nullptr;
    if (canStartKeyListJob()) {
        std::vector<GpgME::Key> keys;
        m_keylistjob->exec(keyListPattern(), /*secretOnly=*/false, keys);
        if (!keys.empty()) {
            m_key = keys.back();
        }
    }
    if (m_keylistjob) {
        m_keylistjob->deleteLater();    // exec'ed jobs don't delete themselves
    }
    m_keylistjob = nullptr;
    setRunning(false);
}

bool VerifyOpaqueBodyPartMemento::canStartKeyListJob() const
{
    if (!m_keylistjob) {
        return false;
    }
    const char *const fpr = m_vr.signature(0).fingerprint();
    return fpr && *fpr;
}

QStringList VerifyOpaqueBodyPartMemento::keyListPattern() const
{
    assert(canStartKeyListJob());
    return QStringList(QString::fromLatin1(m_vr.signature(0).fingerprint()));
}

void VerifyOpaqueBodyPartMemento::saveResult(const VerificationResult &vr,
        const QByteArray &plainText)
{
    assert(m_job);
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento::saveResult called";
#endif
    m_vr = vr;
    m_plainText = plainText;
    setAuditLog(m_job->auditLogError(), m_job->auditLogAsHtml());
}

void VerifyOpaqueBodyPartMemento::slotResult(const VerificationResult &vr,
        const QByteArray &plainText)
{
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento::slotResult called";
#endif
    saveResult(vr, plainText);
    m_job = nullptr;
    if (canStartKeyListJob() && startKeyListJob()) {
#ifdef DEBUG_SIGNATURE
        qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento: canStartKeyListJob && startKeyListJob";
#endif
        return;
    }
    if (m_keylistjob) {
        m_keylistjob->deleteLater();
    }
    m_keylistjob = nullptr;
    setRunning(false);
    notify();
}

bool VerifyOpaqueBodyPartMemento::startKeyListJob()
{
    assert(canStartKeyListJob());
    if (const GpgME::Error err = m_keylistjob->start(keyListPattern())) {
        return false;
    }
    connect(m_keylistjob, SIGNAL(done()), this, SLOT(slotKeyListJobDone()));
    connect(m_keylistjob, SIGNAL(nextKey(GpgME::Key)),
            this, SLOT(slotNextKey(GpgME::Key)));
    return true;
}

void VerifyOpaqueBodyPartMemento::slotNextKey(const GpgME::Key &key)
{
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento::slotNextKey called";
#endif
    m_key = key;
}

void VerifyOpaqueBodyPartMemento::slotKeyListJobDone()
{
#ifdef DEBUG_SIGNATURE
    qCDebug(MIMETREEPARSER_LOG) << "tokoe: VerifyOpaqueBodyPartMemento::slotKeyListJobDone called";
#endif
    m_keylistjob = nullptr;
    setRunning(false);
    notify();
}