// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include <QtCore/qmimedata.h>

#include "qutimimeconverter.h"
#include "qmacmimeregistry_p.h"
#include "qguiapplication.h"
#include "private/qcore_mac_p.h"

QT_BEGIN_NAMESPACE

using namespace Qt::StringLiterals;

namespace QMacMimeRegistry {

typedef QList<QUtiMimeConverter*> MimeList;
Q_GLOBAL_STATIC(MimeList, globalMimeList)
Q_GLOBAL_STATIC(QStringList, globalDraggedTypesList)

// implemented in qutimimeconverter.mm
void registerBuiltInTypes();

void registerDraggedTypes(const QStringList &types)
{
    (*globalDraggedTypesList()) += types;
}

const QStringList& enabledDraggedTypes()
{
    return (*globalDraggedTypesList());
}

/*****************************************************************************
  QDnD debug facilities
 *****************************************************************************/
//#define DEBUG_MIME_MAPS

/*!
  \class QMacMimeRegistry
  \internal
  \ingroup draganddrop
*/

/*!
  \internal

  This is an internal function.
*/
void initializeMimeTypes()
{
    if (globalMimeList()->isEmpty())
        registerBuiltInTypes();
}

/*!
  \internal
*/
void destroyMimeTypes()
{
    MimeList *mimes = globalMimeList();
    while (!mimes->isEmpty())
        delete mimes->takeFirst();
}

/*
  Returns a MIME type of for scope \a scope for \a uti, or \nullptr if none exists.
*/
QString flavorToMime(QUtiMimeConverter::HandlerScope scope, const QString &uti)
{
    const MimeList &mimes = *globalMimeList();
    for (const auto &mime : mimes) {
        const bool relevantScope = mime->scope() & scope;
#ifdef DEBUG_MIME_MAPS
        qDebug("QMacMimeRegistry::flavorToMime: attempting (%d) for uti %s [%s]",
               relevantScope, qPrintable(uti), qPrintable((*it)->mimeForUti(uti)));
#endif
        if (relevantScope) {
            const QString mimeType = mime->mimeForUti(uti);
            if (!mimeType.isNull())
                return mimeType;
        }
    }
    return QString();
}

void registerMimeConverter(QUtiMimeConverter *macMime)
{
    // globalMimeList is in decreasing priority order. Recently added
    // converters take prioity over previously added converters: prepend
    // to the list.
    globalMimeList()->prepend(macMime);
}

void unregisterMimeConverter(QUtiMimeConverter *macMime)
{
    if (!QGuiApplication::closingDown())
        globalMimeList()->removeAll(macMime);
}


/*
  Returns a list of all currently defined QUtiMimeConverter objects for scope \a scope.
*/
QList<QUtiMimeConverter *> all(QUtiMimeConverter::HandlerScope scope)
{
    MimeList ret;
    const MimeList &mimes = *globalMimeList();
    for (const auto &mime : mimes) {
        if (mime->scope() & scope)
            ret.append(mime);
    }
    return ret;
}

} // namespace QMacMimeRegistry

QT_END_NAMESPACE