/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 */

#include <com/sun/star/awt/MouseButton.hpp>
#include <com/sun/star/datatransfer/DataFlavor.hpp>
#include <com/sun/star/datatransfer/dnd/DNDConstants.hpp>
#include <cppuhelper/supportsservice.hxx>
#include <sal/log.hxx>

#include <QtCore/QMimeData>
#include <QtCore/QUrl>

#include <Qt5DragAndDrop.hxx>
#include <Qt5Frame.hxx>
#include <Qt5Widget.hxx>

using namespace com::sun::star;
using namespace com::sun::star::uno;
using namespace com::sun::star::lang;

Qt5DnDTransferable::Qt5DnDTransferable(const QMimeData* pMimeData)
    : Qt5Transferable(QClipboard::Clipboard)
    , m_pMimeData(pMimeData)
{
}

css::uno::Any Qt5DnDTransferable::getTransferData(const css::datatransfer::DataFlavor&)
{
    uno::Any aAny;
    assert(m_pMimeData);

    // FIXME: not sure if we should support more mimetypes here
    // (how to carry out external DnD with anything else than [file] URL?)
    if (m_pMimeData->hasUrls())
    {
        QList<QUrl> urlList = m_pMimeData->urls();

        if (urlList.size() > 0)
        {
            std::string aStr;

            // transfer data is list of URLs
            for (int i = 0; i < urlList.size(); ++i)
            {
                QString url = urlList.at(i).path();
                aStr += url.toStdString();
                // separated by newline if more than 1
                if (i < urlList.size() - 1)
                    aStr += "\n";
            }

            Sequence<sal_Int8> aSeq(reinterpret_cast<const sal_Int8*>(aStr.c_str()), aStr.length());
            aAny <<= aSeq;
        }
    }
    return aAny;
}

std::vector<css::datatransfer::DataFlavor> Qt5DnDTransferable::getTransferDataFlavorsAsVector()
{
    std::vector<css::datatransfer::DataFlavor> aVector;
    css::datatransfer::DataFlavor aFlavor;

    if (m_pMimeData)
    {
        for (QString& rMimeType : m_pMimeData->formats())
        {
            // filter out non-MIME types such as TARGETS, MULTIPLE, TIMESTAMP
            if (rMimeType.indexOf('/') == -1)
                continue;

            if (rMimeType.startsWith("text/plain"))
            {
                aFlavor.MimeType = "text/plain;charset=utf-16";
                aFlavor.DataType = cppu::UnoType<OUString>::get();
                aVector.push_back(aFlavor);
            }
            else
            {
                aFlavor.MimeType = toOUString(rMimeType);
                aFlavor.DataType = cppu::UnoType<Sequence<sal_Int8>>::get();
                aVector.push_back(aFlavor);
            }
        }
    }

    return aVector;
}

Qt5DragSource::~Qt5DragSource()
{
    //if (m_pFrame)
    //    m_pFrame->deregisterDragSource(this);
}

void Qt5DragSource::deinitialize() { m_pFrame = nullptr; }

sal_Bool Qt5DragSource::isDragImageSupported() { return true; }

sal_Int32 Qt5DragSource::getDefaultCursor(sal_Int8) { return 0; }

void Qt5DragSource::initialize(const css::uno::Sequence<css::uno::Any>& rArguments)
{
    if (rArguments.getLength() < 2)
    {
        throw RuntimeException("DragSource::initialize: Cannot install window event handler",
                               static_cast<OWeakObject*>(this));
    }

    sal_IntPtr nFrame = 0;
    rArguments.getConstArray()[1] >>= nFrame;

    if (!nFrame)
    {
        throw RuntimeException("DragSource::initialize: missing SalFrame",
                               static_cast<OWeakObject*>(this));
    }

    m_pFrame = reinterpret_cast<Qt5Frame*>(nFrame);
    m_pFrame->registerDragSource(this);
}

void Qt5DragSource::startDrag(
    const datatransfer::dnd::DragGestureEvent& /*rEvent*/, sal_Int8 sourceActions,
    sal_Int32 /*cursor*/, sal_Int32 /*image*/,
    const css::uno::Reference<css::datatransfer::XTransferable>& rTrans,
    const css::uno::Reference<css::datatransfer::dnd::XDragSourceListener>& rListener)
{
    m_xListener = rListener;
    m_xTrans = rTrans;

    if (m_pFrame)
    {
        Qt5Widget* qw = static_cast<Qt5Widget*>(m_pFrame->GetQWidget());
        m_ActiveDragSource = this;
        qw->startDrag(sourceActions);
    }
    else
        dragFailed();
}

void Qt5DragSource::dragFailed()
{
    if (m_xListener.is())
    {
        datatransfer::dnd::DragSourceDropEvent aEv;
        aEv.DropAction = datatransfer::dnd::DNDConstants::ACTION_NONE;
        aEv.DropSuccess = false;
        auto xListener = m_xListener;
        m_xListener.clear();
        xListener->dragDropEnd(aEv);
    }
}

void Qt5DragSource::fire_dragEnd(sal_Int8 nAction)
{
    if (m_xListener.is())
    {
        datatransfer::dnd::DragSourceDropEvent aEv;
        aEv.DropAction = nAction;
        aEv.DropSuccess = true; // FIXME: what if drop didn't work out?
        auto xListener = m_xListener;
        m_xListener.clear();
        xListener->dragDropEnd(aEv);
    }
    m_ActiveDragSource = nullptr;
}

OUString SAL_CALL Qt5DragSource::getImplementationName()
{
    return OUString("com.sun.star.datatransfer.dnd.VclQt5DragSource");
}

sal_Bool SAL_CALL Qt5DragSource::supportsService(OUString const& ServiceName)
{
    return cppu::supportsService(this, ServiceName);
}

css::uno::Sequence<OUString> SAL_CALL Qt5DragSource::getSupportedServiceNames()
{
    Sequence<OUString> aRet{ "com.sun.star.datatransfer.dnd.Qt5DragSource" };
    return aRet;
}

Qt5DropTarget::Qt5DropTarget()
    : WeakComponentImplHelper(m_aMutex)
    , m_pFrame(nullptr)
    , m_bActive(false)
    , m_nDefaultActions(0)
{
}

OUString SAL_CALL Qt5DropTarget::getImplementationName()
{
    return OUString("com.sun.star.datatransfer.dnd.VclQt5DropTarget");
}

sal_Bool SAL_CALL Qt5DropTarget::supportsService(OUString const& ServiceName)
{
    return cppu::supportsService(this, ServiceName);
}

css::uno::Sequence<OUString> SAL_CALL Qt5DropTarget::getSupportedServiceNames()
{
    Sequence<OUString> aRet{ "com.sun.star.datatransfer.dnd.Qt5DropTarget" };
    return aRet;
}

Qt5DropTarget::~Qt5DropTarget()
{
    //if (m_pFrame)
    //m_pFrame->deregisterDropTarget(this);
}

void Qt5DropTarget::deinitialize()
{
    m_pFrame = nullptr;
    m_bActive = false;
}

void Qt5DropTarget::initialize(const Sequence<Any>& rArguments)
{
    if (rArguments.getLength() < 2)
    {
        throw RuntimeException("DropTarget::initialize: Cannot install window event handler",
                               static_cast<OWeakObject*>(this));
    }

    sal_IntPtr nFrame = 0;
    rArguments.getConstArray()[1] >>= nFrame;

    if (!nFrame)
    {
        throw RuntimeException("DropTarget::initialize: missing SalFrame",
                               static_cast<OWeakObject*>(this));
    }

    mnDragAction = datatransfer::dnd::DNDConstants::ACTION_NONE;
    mnDropAction = datatransfer::dnd::DNDConstants::ACTION_NONE;

    m_pFrame = reinterpret_cast<Qt5Frame*>(nFrame);
    m_pFrame->registerDropTarget(this);
    m_bActive = true;
}

void Qt5DropTarget::addDropTargetListener(
    const Reference<css::datatransfer::dnd::XDropTargetListener>& xListener)
{
    ::osl::Guard<::osl::Mutex> aGuard(m_aMutex);

    m_aListeners.push_back(xListener);
}

void Qt5DropTarget::removeDropTargetListener(
    const Reference<css::datatransfer::dnd::XDropTargetListener>& xListener)
{
    ::osl::Guard<::osl::Mutex> aGuard(m_aMutex);

    m_aListeners.erase(std::remove(m_aListeners.begin(), m_aListeners.end(), xListener),
                       m_aListeners.end());
}

sal_Bool Qt5DropTarget::isActive() { return m_bActive; }

void Qt5DropTarget::setActive(sal_Bool bActive) { m_bActive = bActive; }

sal_Int8 Qt5DropTarget::getDefaultActions() { return m_nDefaultActions; }

void Qt5DropTarget::setDefaultActions(sal_Int8 nDefaultActions)
{
    m_nDefaultActions = nDefaultActions;
}

void Qt5DropTarget::fire_dragEnter(const css::datatransfer::dnd::DropTargetDragEnterEvent& dtde)
{
    osl::ClearableGuard<::osl::Mutex> aGuard(m_aMutex);
    std::vector<css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>> aListeners(
        m_aListeners);
    aGuard.clear();

    for (auto const& listener : aListeners)
    {
        listener->dragEnter(dtde);
    }
}

void Qt5DropTarget::fire_dragOver(const css::datatransfer::dnd::DropTargetDragEnterEvent& dtde)
{
    osl::ClearableGuard<::osl::Mutex> aGuard(m_aMutex);
    std::vector<css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>> aListeners(
        m_aListeners);
    aGuard.clear();

    for (auto const& listener : aListeners)
    {
        listener->dragOver(dtde);
    }
}

void Qt5DropTarget::fire_drop(const css::datatransfer::dnd::DropTargetDropEvent& dtde)
{
    osl::ClearableGuard<osl::Mutex> aGuard(m_aMutex);
    std::vector<css::uno::Reference<css::datatransfer::dnd::XDropTargetListener>> aListeners(
        m_aListeners);
    aGuard.clear();

    for (auto const& listener : aListeners)
    {
        listener->drop(dtde);
    }
}

void Qt5DropTarget::acceptDrag(sal_Int8 dragOperation)
{
    mnDragAction = dragOperation;
    return;
}

void Qt5DropTarget::rejectDrag()
{
    mnDragAction = 0;
    return;
}

void Qt5DropTarget::acceptDrop(sal_Int8 dropOperation)
{
    mnDropAction = dropOperation;
    return;
}

void Qt5DropTarget::rejectDrop()
{
    mnDropAction = 0;
    return;
}

void Qt5DropTarget::dropComplete(sal_Bool /*success*/) { return; }

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