/* Copyright (C) 2015
 * 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. 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.
 */

#include "blackgui/components/dbairlineicaoselectorbase.h"
#include "blackgui/guiapplication.h"
#include "blackcore/webdataservices.h"
#include "blackmisc/aviation/airlineicaocodelist.h"
#include "blackmisc/db/datastoreutility.h"
#include "blackmisc/compare.h"
#include "blackmisc/variant.h"

#include <QCompleter>
#include <QDragEnterEvent>
#include <QDragLeaveEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QMetaType>
#include <QPalette>
#include <QtGlobal>
#include <QPointer>

using namespace BlackGui;
using namespace BlackCore;
using namespace BlackMisc;
using namespace BlackMisc::Db;
using namespace BlackMisc::Network;
using namespace BlackMisc::Aviation;
using namespace BlackMisc::Network;

namespace BlackGui
{
    namespace Components
    {
        CDbAirlineIcaoSelectorBase::CDbAirlineIcaoSelectorBase(QWidget *parent) : QFrame(parent)
        {
            this->setAcceptDrops(true);
            this->setAcceptedMetaTypeIds({qMetaTypeId<CAirlineIcaoCode>(), qMetaTypeId<CAirlineIcaoCodeList>()});

            connect(sGui->getWebDataServices(), &CWebDataServices::dataRead, this, &CDbAirlineIcaoSelectorBase::onCodesRead, Qt::QueuedConnection);

            // when we already have data, init completers. This can not be done directly in the
            // constructor due to virtual functions
            const int c = sGui->getWebDataServices()->getAirlineIcaoCodesCount();
            if (c > 0)
            {
                QPointer<CDbAirlineIcaoSelectorBase> myself(this);
                QTimer::singleShot(500, [ = ]()
                {
                    if (!sGui || sGui->isShuttingDown()) { return; }
                    if (!myself) { return; }
                    this->onCodesRead(CEntityFlags::AirlineIcaoEntity, CEntityFlags::ReadFinished, c);
                });
            }
        }

        CDbAirlineIcaoSelectorBase::~CDbAirlineIcaoSelectorBase()
        { }

        bool CDbAirlineIcaoSelectorBase::setAirlineIcao(const CAirlineIcaoCode &icao)
        {
            if (icao == m_currentIcao) { return false; }
            if (icao.isLoadedFromDb())
            {
                m_currentIcao = icao;
            }
            else
            {
                m_currentIcao = sGui->getWebDataServices()->smartAirlineIcaoSelector(icao);
            }
            emit changedAirlineIcao(m_currentIcao);
            return true;
        }

        bool CDbAirlineIcaoSelectorBase::setAirlineIcao(int key)
        {
            CAirlineIcaoCode icao(sGui->getWebDataServices()->getAirlineIcaoCodeForDbKey(key));
            if (!icao.hasCompleteData()) { return false; }
            this->setAirlineIcao(icao);
            return true;
        }

        bool CDbAirlineIcaoSelectorBase::isSet() const
        {
            const CAirlineIcaoCode icao(this->getAirlineIcao());
            return icao.isLoadedFromDb() || icao.hasCompleteData();
        }

        void CDbAirlineIcaoSelectorBase::dragEnterEvent(QDragEnterEvent *event)
        {
            if (!event || !acceptDrop(event->mimeData())) { return; }
            this->setBackgroundRole(QPalette::Highlight);
            event->acceptProposedAction();
        }

        void CDbAirlineIcaoSelectorBase::dragMoveEvent(QDragMoveEvent *event)
        {
            if (!event || !acceptDrop(event->mimeData())) { return; }
            event->acceptProposedAction();
        }

        void CDbAirlineIcaoSelectorBase::dragLeaveEvent(QDragLeaveEvent *event)
        {
            if (!event) { return; }
            event->accept();
        }

        void CDbAirlineIcaoSelectorBase::dropEvent(QDropEvent *event)
        {
            if (!event || !acceptDrop(event->mimeData())) { return; }
            const CVariant valueVariant(toCVariant(event->mimeData()));
            if (valueVariant.isValid())
            {
                if (valueVariant.canConvert<CAirlineIcaoCode>())
                {
                    const CAirlineIcaoCode icao(valueVariant.value<CAirlineIcaoCode>());
                    if (!icao.hasValidDbKey()) { return; }
                    this->setAirlineIcao(icao);
                }
                else if (valueVariant.canConvert<CAirlineIcaoCodeList>())
                {
                    const CAirlineIcaoCodeList icaos(valueVariant.value<CAirlineIcaoCodeList>());
                    if (icaos.isEmpty()) { return; }
                    this->setAirlineIcao(icaos.front());
                }
            }
        }

        void CDbAirlineIcaoSelectorBase::onCodesRead(CEntityFlags::Entity entity, CEntityFlags::ReadState readState, int count)
        {
            if (!sGui) { return; }
            if (entity.testFlag(CEntityFlags::AirlineIcaoEntity) && CEntityFlags::isFinishedReadState(readState))
            {
                if (count > 0)
                {
                    QCompleter *c = this->createCompleter();
                    Q_ASSERT_X(c, Q_FUNC_INFO, "missing converter");
                    connect(c, qOverload<const QString &>(&QCompleter::activated), this, &CDbAirlineIcaoSelectorBase::onCompleterActivated);
                    m_completer.reset(c); // deletes any old completer
                }
                else
                {
                    m_completer.reset(nullptr);
                }
            }
        }

        void CDbAirlineIcaoSelectorBase::onCompleterActivated(const QString &icaoString)
        {
            const int dbKey = CDatastoreUtility::extractIntegerKey(icaoString);
            if (dbKey < 0) { return; }
            this->setAirlineIcao(dbKey);
        }
    }// class
} // ns