/* -*- 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/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <utility>
#include <vcl/svapp.hxx>
#include <cppuhelper/implbase.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/uno/XComponentContext.hpp>
#include <com/sun/star/awt/XRequestCallback.hpp>

/// anonymous implementation namespace
namespace {

class AsyncCallback:
    public ::cppu::WeakImplHelper<
        css::lang::XServiceInfo,
        css::awt::XRequestCallback>
{
public:
    AsyncCallback() {}
    AsyncCallback(const AsyncCallback&) = delete;
    AsyncCallback& operator=(const AsyncCallback&) = delete;

    // css::lang::XServiceInfo:
    virtual OUString SAL_CALL getImplementationName() override;
    virtual sal_Bool SAL_CALL supportsService(const OUString & ServiceName) override;
    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;

    // css::awt::XRequestCallback:
    virtual void SAL_CALL addCallback(const css::uno::Reference< css::awt::XCallback > & xCallback, const css::uno::Any & aData) override;

private:

    struct CallbackData
    {
        CallbackData( css::uno::Reference< css::awt::XCallback > _xCallback, css::uno::Any aAny ) :
            xCallback(std::move( _xCallback )), aData(std::move( aAny )) {}

        css::uno::Reference< css::awt::XCallback > xCallback;
        css::uno::Any                              aData;
    };

    DECL_STATIC_LINK( AsyncCallback, Notify_Impl, void*, void );

    virtual ~AsyncCallback() override {}
};

// com.sun.star.uno.XServiceInfo:
OUString SAL_CALL AsyncCallback::getImplementationName()
{
    return u"com.sun.star.awt.comp.AsyncCallback"_ustr;
}

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

css::uno::Sequence< OUString > SAL_CALL AsyncCallback::getSupportedServiceNames()
{
    return { u"com.sun.star.awt.AsyncCallback"_ustr };
}

// css::awt::XRequestCallback:
void SAL_CALL AsyncCallback::addCallback(const css::uno::Reference< css::awt::XCallback > & xCallback, const css::uno::Any & aData)
{
    if ( Application::IsInMain() )
    {
        // NOTE: We don't need SolarMutexGuard here as Application::PostUserEvent is thread-safe
        CallbackData* pCallbackData = new CallbackData( xCallback, aData );
        Application::PostUserEvent( LINK( this, AsyncCallback, Notify_Impl ), pCallbackData );
    }
}

// private asynchronous link to call reference to the callback object
IMPL_STATIC_LINK( AsyncCallback, Notify_Impl, void*, p, void )
{
    CallbackData* pCallbackData = static_cast<CallbackData*>(p);
    try
    {
        // Asynchronous execution
        // Check pointer and reference before!
        if ( pCallbackData && pCallbackData->xCallback.is() )
            pCallbackData->xCallback->notify( pCallbackData->aData );
    }
    catch ( css::uno::Exception& )
    {
    }

    delete pCallbackData;
}

} // closing anonymous implementation namespace

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
com_sun_star_awt_comp_AsyncCallback_get_implementation(
    css::uno::XComponentContext *,
    css::uno::Sequence<css::uno::Any> const &)
{
    return cppu::acquire(new AsyncCallback());
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */