/* -*- 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 "RecentlyUsedMasterPages.hxx"

#include "MasterPageContainerProviders.hxx"

#include <MasterPageObserver.hxx>

#include "MasterPageDescriptor.hxx"

#include <tools/ConfigurationAccess.hxx>

#include <algorithm>

#include <memory>

#include <vector>

#include <com/sun/star/container/XNameAccess.hpp>

#include <com/sun/star/container/XNameContainer.hpp>

#include <com/sun/star/lang/XSingleServiceFactory.hpp>

#include <osl/doublecheckedlocking.h>

#include <osl/getglobalmutex.hxx>

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

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

namespace {

OUString GetPathToImpressConfigurationRoot()

{

    return u"/org.openoffice.Office.Impress/"_ustr;

}

OUString GetPathToSetNode()

{

    return u"MultiPaneGUI/ToolPanel/RecentlyUsedMasterPages"_ustr;

}

} // end of anonymous namespace

namespace sd::sidebar {

RecentlyUsedMasterPages* RecentlyUsedMasterPages::mpInstance = nullptr;

RecentlyUsedMasterPages&  RecentlyUsedMasterPages::Instance()

{

    if (mpInstance == nullptr)

    {

        ::osl::GetGlobalMutex aMutexFunctor;

        ::osl::MutexGuard aGuard (aMutexFunctor());

        if (mpInstance == nullptr)

        {

            RecentlyUsedMasterPages* pInstance = new RecentlyUsedMasterPages();

            pInstance->LateInit();

            SdGlobalResourceContainer::Instance().AddResource (

                ::std::unique_ptr<SdGlobalResource>(pInstance));

            OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();

            mpInstance = pInstance;

        }

    }

    else {

        OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();

    }

    return *mpInstance;

}

constexpr size_t gnMaxListSize(8);

RecentlyUsedMasterPages::RecentlyUsedMasterPages()

    : mpContainer(std::make_shared<MasterPageContainer>())

{

}

void RecentlyUsedMasterPages::ImplDestroy()

{

    Link<MasterPageContainerChangeEvent&,void> aLink (LINK(this,RecentlyUsedMasterPages,MasterPageContainerChangeListener));

    mpContainer->RemoveChangeListener(aLink);

    MasterPageObserver::Instance().RemoveEventListener(

        LINK(this,RecentlyUsedMasterPages,MasterPageChangeListener));

}

RecentlyUsedMasterPages::~RecentlyUsedMasterPages()

{

    suppress_fun_call_w_exception(ImplDestroy());

}

void RecentlyUsedMasterPages::LateInit()

{

    Link<MasterPageContainerChangeEvent&,void> aLink (LINK(this,RecentlyUsedMasterPages,MasterPageContainerChangeListener));

    mpContainer->AddChangeListener(aLink);

    LoadPersistentValues ();

    MasterPageObserver::Instance().AddEventListener(

        LINK(this,RecentlyUsedMasterPages,MasterPageChangeListener));

}

void RecentlyUsedMasterPages::LoadPersistentValues()

{

    try

    {

        sdtools::ConfigurationAccess aConfiguration (

            GetPathToImpressConfigurationRoot(),

            sdtools::ConfigurationAccess::READ_ONLY);

        Reference<container::XNameAccess> xSet (

            aConfiguration.GetConfigurationNode(GetPathToSetNode()),

            UNO_QUERY);

        if ( ! xSet.is())

            return;

        static constexpr OUStringLiteral sURLMemberName(u"URL");

        static constexpr OUStringLiteral sNameMemberName(u"Name");

        OUString sURL;

        OUString sName;

        // Read the names and URLs of the master pages.

        const Sequence<OUString> aKeys (xSet->getElementNames());

        mvMasterPages.clear();

        mvMasterPages.reserve(aKeys.getLength());

        for (const auto& rKey : aKeys)

        {

            Reference<container::XNameAccess> xSetItem (

                xSet->getByName(rKey), UNO_QUERY);

            if (xSetItem.is())

            {

                Any aURL (xSetItem->getByName(sURLMemberName));

                Any aName (xSetItem->getByName(sNameMemberName));

                aURL >>= sURL;

                aName >>= sName;

                SharedMasterPageDescriptor pDescriptor = std::make_shared<MasterPageDescriptor>(

                    MasterPageContainer::TEMPLATE,

                    -1,

                    sURL,

                    OUString(),

                    sName,

                    false,

                    std::make_shared<TemplatePageObjectProvider>(sURL),

                    std::make_shared<TemplatePreviewProvider>(sURL));

                // For user supplied templates we use a different

                // preview provider: The preview in the document shows

                // not only shapes on the master page but also shapes on

                // the foreground.  This is misleading and therefore

                // these previews are discarded and created directly

                // from the page objects.

                if (pDescriptor->GetURLClassification() == MasterPageDescriptor::URLCLASS_USER)

                    pDescriptor->mpPreviewProvider = std::make_shared<PagePreviewProvider>();

                MasterPageContainer::Token aToken (mpContainer->PutMasterPage(pDescriptor));

                mvMasterPages.emplace_back(aToken,sURL,sName);

            }

        }

        ResolveList();

    }

    catch (Exception&)

    {

        // Ignore exception.

    }

}

void RecentlyUsedMasterPages::SavePersistentValues()

{

    try

    {

        sdtools::ConfigurationAccess aConfiguration (

            GetPathToImpressConfigurationRoot(),

            sdtools::ConfigurationAccess::READ_WRITE);

        Reference<container::XNameContainer> xSet (

            aConfiguration.GetConfigurationNode(GetPathToSetNode()),

            UNO_QUERY);

        if ( ! xSet.is())

            return;

        // Clear the set.

        const Sequence<OUString> aKeys (xSet->getElementNames());

        for (const auto& rKey : aKeys)

            xSet->removeByName (rKey);

        // Fill it with the URLs of this object.

        static constexpr OUStringLiteral sURLMemberName(u"URL");

        static constexpr OUStringLiteral sNameMemberName(u"Name");

        Any aValue;

        Reference<lang::XSingleServiceFactory> xChildFactory (

            xSet, UNO_QUERY);

        if ( ! xChildFactory.is())

            return;

        sal_Int32 nIndex(0);

        for (const auto& rDescriptor : mvMasterPages)

        {

            // Create new child.

            OUString sKey = "index_" + OUString::number(nIndex);

            Reference<container::XNameReplace> xChild(

                xChildFactory->createInstance(), UNO_QUERY);

            if (xChild.is())

            {

                xSet->insertByName (sKey, Any(xChild));

                aValue <<= rDescriptor.msURL;

                xChild->replaceByName (sURLMemberName, aValue);

                aValue <<= rDescriptor.msName;

                xChild->replaceByName (sNameMemberName, aValue);

            }

            ++nIndex;

        }

        // Write the data back to disk.

        aConfiguration.CommitChanges();

    }

    catch (Exception&)

    {

        // Ignore exception.

    }

}

void RecentlyUsedMasterPages::AddEventListener (const Link<LinkParamNone*,void>& rEventListener)

{

    if (::std::find (

        maListeners.begin(),

        maListeners.end(),

        rEventListener) == maListeners.end())

    {

        maListeners.push_back (rEventListener);

    }

}

void RecentlyUsedMasterPages::RemoveEventListener (const Link<LinkParamNone*,void>& rEventListener)

{

    auto aIter = ::std::find (

        maListeners.begin(),

        maListeners.end(),

        rEventListener);

    if (aIter != maListeners.end())

        maListeners.erase(aIter);

}

int RecentlyUsedMasterPages::GetMasterPageCount() const

{

    return mvMasterPages.size();

}

MasterPageContainer::Token RecentlyUsedMasterPages::GetTokenForIndex (sal_uInt32 nIndex) const

{

    if(nIndex<mvMasterPages.size())

        return mvMasterPages[nIndex].maToken;

    else

        return MasterPageContainer::NIL_TOKEN;

}

void RecentlyUsedMasterPages::SendEvent()

{

    for (const auto& aLink : maListeners)

    {

        aLink.Call(nullptr);

    }

}

IMPL_LINK(RecentlyUsedMasterPages, MasterPageChangeListener,

    MasterPageObserverEvent&, rEvent, void)

{

    switch (rEvent.meType)

    {

        case MasterPageObserverEvent::ET_MASTER_PAGE_ADDED:

        case MasterPageObserverEvent::ET_MASTER_PAGE_EXISTS:

            AddMasterPage(

                mpContainer->GetTokenForStyleName(rEvent.mrMasterPageName));

            break;

        case MasterPageObserverEvent::ET_MASTER_PAGE_REMOVED:

            // Do not change the list of recently master pages (the deleted

            // page was recently used) but tell the listeners.  They may want

            // to update their lists.

            SendEvent();

            break;

    }

}

IMPL_LINK(RecentlyUsedMasterPages, MasterPageContainerChangeListener,

    MasterPageContainerChangeEvent&, rEvent, void)

{

    switch (rEvent.meEventType)

    {

        case MasterPageContainerChangeEvent::EventType::CHILD_ADDED:

        case MasterPageContainerChangeEvent::EventType::CHILD_REMOVED:

        case MasterPageContainerChangeEvent::EventType::INDEX_CHANGED:

            ResolveList();

            break;

        default:

            // Ignored.

            break;

    }

}

void RecentlyUsedMasterPages::AddMasterPage (

    MasterPageContainer::Token aToken)

{

    // For the page to be inserted the token has to be valid and the page

    // has to have a valid URL.  This excludes master pages that do not come

    // from template files.

    if (aToken == MasterPageContainer::NIL_TOKEN

        || mpContainer->GetURLForToken(aToken).isEmpty())

        return;

    MasterPageList::iterator aIterator (

        ::std::find_if(mvMasterPages.begin(),mvMasterPages.end(),

            Descriptor::TokenComparator(aToken)));

    if (aIterator != mvMasterPages.end())

    {

        // When an entry for the given token already exists then remove

        // it now and insert it later at the head of the list.

        mvMasterPages.erase (aIterator);

    }

    mvMasterPages.insert(mvMasterPages.begin(),

        Descriptor(

            aToken,

            mpContainer->GetURLForToken(aToken),

            mpContainer->GetStyleNameForToken(aToken)));

    // Shorten list to maximal size.

    while (mvMasterPages.size() > gnMaxListSize)

    {

        mvMasterPages.pop_back ();

    }

    SavePersistentValues ();

    SendEvent();

}

void RecentlyUsedMasterPages::ResolveList()

{

    bool bNotify (false);

    for (auto& rDescriptor : mvMasterPages)

    {

        if (rDescriptor.maToken == MasterPageContainer::NIL_TOKEN)

        {

            MasterPageContainer::Token aToken (mpContainer->GetTokenForURL(rDescriptor.msURL));

            rDescriptor.maToken = aToken;

            if (aToken != MasterPageContainer::NIL_TOKEN)

                bNotify = true;

        }

        else

        {

            if ( ! mpContainer->HasToken(rDescriptor.maToken))

            {

                rDescriptor.maToken = MasterPageContainer::NIL_TOKEN;

                bNotify = true;

            }

        }

    }

    if (bNotify)

        SendEvent();

}

} // end of namespace sd::sidebar

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