/* -*- 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 <tools/SdGlobalResourceContainer.hxx>

#include <comphelper/processfactory.hxx>

#include <comphelper/unique_disposing_ptr.hxx>

#include <com/sun/star/frame/Desktop.hpp>

#include <sal/log.hxx>

#include <tools/debug.hxx>

#include <algorithm>

#include <memory>

#include <mutex>

#include <vector>

using namespace ::com::sun::star;

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

namespace sd {

class SdGlobalResourceContainerInstance

    : public comphelper::unique_disposing_solar_mutex_reset_ptr<SdGlobalResourceContainer>

{

public:

    SdGlobalResourceContainerInstance()

        : comphelper::unique_disposing_solar_mutex_reset_ptr<SdGlobalResourceContainer>(

            uno::Reference<lang::XComponent>(frame::Desktop::create(comphelper::getProcessComponentContext()), uno::UNO_QUERY_THROW),

            new SdGlobalResourceContainer, true)

    {

    }

};

namespace {

SdGlobalResourceContainerInstance& theSdGlobalResourceContainerInstance()

{

    static SdGlobalResourceContainerInstance SINGLETON;

    return SINGLETON;

}

} // namespace

//===== SdGlobalResourceContainer::Implementation =============================

class SdGlobalResourceContainer::Implementation

{

private:

    friend class SdGlobalResourceContainer;

    std::mutex maMutex;

    /** All instances of SdGlobalResource in this vector are owned by the

        container and will be destroyed when the container is destroyed.

    */

    std::vector<std::unique_ptr<SdGlobalResource>> maResources;

    typedef ::std::vector<std::shared_ptr<SdGlobalResource> > SharedResourceList;

    SharedResourceList maSharedResources;

    typedef ::std::vector<Reference<XInterface> > XInterfaceResourceList;

    XInterfaceResourceList maXInterfaceResources;

};

// static

SdGlobalResourceContainer& SdGlobalResourceContainer::Instance()

{

    SdGlobalResourceContainer *const pRet(theSdGlobalResourceContainerInstance().get());

    assert(pRet); // error if it has been deleted and is null

    return *pRet;

}

//===== SdGlobalResourceContainer =============================================

void SdGlobalResourceContainer::AddResource (

    ::std::unique_ptr<SdGlobalResource> pResource)

{

    std::unique_lock aGuard (mpImpl->maMutex);

    assert( std::none_of(

                mpImpl->maResources.begin(),

                mpImpl->maResources.end(),

                [&](const std::unique_ptr<SdGlobalResource>& p) { return p == pResource; })

            && "duplicate resource?");

    mpImpl->maResources.push_back(std::move(pResource));

}

void SdGlobalResourceContainer::AddResource (

    const std::shared_ptr<SdGlobalResource>& pResource)

{

    std::unique_lock aGuard (mpImpl->maMutex);

    Implementation::SharedResourceList::iterator iResource = ::std::find (

        mpImpl->maSharedResources.begin(),

        mpImpl->maSharedResources.end(),

        pResource);

    if (iResource == mpImpl->maSharedResources.end())

        mpImpl->maSharedResources.push_back(pResource);

    else

    {

        SAL_WARN ("sd.tools",

            "SdGlobalResourceContainer:AddResource(): Resource added twice.");

    }

}

void SdGlobalResourceContainer::AddResource (const Reference<XInterface>& rxResource)

{

    std::unique_lock aGuard (mpImpl->maMutex);

    Implementation::XInterfaceResourceList::iterator iResource = ::std::find (

        mpImpl->maXInterfaceResources.begin(),

        mpImpl->maXInterfaceResources.end(),

        rxResource);

    if (iResource == mpImpl->maXInterfaceResources.end())

        mpImpl->maXInterfaceResources.push_back(rxResource);

    else

    {

        SAL_WARN ("sd.tools",

            "SdGlobalResourceContainer:AddResource(): Resource added twice.");

    }

}

SdGlobalResourceContainer::SdGlobalResourceContainer()

    : mpImpl (new SdGlobalResourceContainer::Implementation)

{

}

SdGlobalResourceContainer::~SdGlobalResourceContainer()

{

    std::unique_lock aGuard (mpImpl->maMutex);

    // Release the resources in reversed order of their addition to the

    // container.  This is because a resource A added before resource B

    // may have been created due to a request of B.  Thus B depends on A and

    // should be destroyed first.

    for (auto iResource = mpImpl->maResources.rbegin();

         iResource != mpImpl->maResources.rend();

         ++iResource)

    {

        iResource->reset();

    }

    // The SharedResourceList has not to be released manually.  We just

    // assert resources that are still held by someone other than us.

    Implementation::SharedResourceList::reverse_iterator iSharedResource;

    for (iSharedResource = mpImpl->maSharedResources.rbegin();

         iSharedResource != mpImpl->maSharedResources.rend();

         ++iSharedResource)

    {

        if (iSharedResource->use_count() > 1)

        {

            SdGlobalResource* pResource = iSharedResource->get();

            SAL_INFO(

                "sd.tools", pResource << " " << iSharedResource->use_count());

            DBG_ASSERT(iSharedResource->use_count() == 1,

                "SdGlobalResource still held in ~SdGlobalResourceContainer");

        }

    }

    Implementation::XInterfaceResourceList::reverse_iterator iXInterfaceResource;

    for (iXInterfaceResource = mpImpl->maXInterfaceResources.rbegin();

         iXInterfaceResource != mpImpl->maXInterfaceResources.rend();

         ++iXInterfaceResource)

    {

        Reference<lang::XComponent> xComponent (*iXInterfaceResource, UNO_QUERY);

        *iXInterfaceResource = nullptr;

        if (xComponent.is())

            xComponent->dispose();

    }

}

} // end of namespace sd

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