/* -*- 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 <salusereventlist.hxx>

#include <salwtype.hxx>

#include <algorithm>

#include <cstdlib>

#include <exception>

#include <typeinfo>

#include <com/sun/star/uno/Exception.hpp>

#include <tools/debug.hxx>

#include <comphelper/diagnose_ex.hxx>

#include <sal/log.hxx>

#include <sal/types.h>

#include <svdata.hxx>

SalUserEventList::SalUserEventList()

    : m_bAllUserEventProcessedSignaled( true )

    , m_aProcessingThread(0)

{

}

SalUserEventList::~SalUserEventList()

{

}

void SalUserEventList::insertFrame( SalFrame* pFrame )

{

    auto aPair = m_aFrames.insert( pFrame );

    assert( aPair.second ); (void) aPair;

}

void SalUserEventList::eraseFrame( SalFrame* pFrame )

{

    auto it = m_aFrames.find( pFrame );

    assert( it != m_aFrames.end() );

    if ( it != m_aFrames.end() )

        m_aFrames.erase( it );

}

bool SalUserEventList::DispatchUserEvents( bool bHandleAllCurrentEvents )

{

    bool bWasEvent = false;

    oslThreadIdentifier aCurId = osl::Thread::getCurrentIdentifier();

    DBG_TESTSOLARMUTEX();

    std::unique_lock aResettableListGuard(m_aUserEventsMutex);

    if (!m_aUserEvents.empty())

    {

        if (bHandleAllCurrentEvents)

        {

            if (m_aProcessingUserEvents.empty())

                m_aProcessingUserEvents.swap(m_aUserEvents);

            else

                m_aProcessingUserEvents.splice(m_aProcessingUserEvents.end(), m_aUserEvents);

        }

        else if (m_aProcessingUserEvents.empty())

        {

            m_aProcessingUserEvents.push_back( m_aUserEvents.front() );

            m_aUserEvents.pop_front();

        }

    }

    if (HasUserEvents_NoLock())

    {

        bWasEvent = true;

        m_aProcessingThread = aCurId;

        SalUserEvent aEvent( nullptr, nullptr, SalEvent::NONE );

        do {

            if (m_aProcessingUserEvents.empty() || aCurId != m_aProcessingThread)

                break;

            aEvent = m_aProcessingUserEvents.front();

            m_aProcessingUserEvents.pop_front();

            // remember to reset the guard before break or continue the loop

            aResettableListGuard.unlock();

            if ( !isFrameAlive( aEvent.m_pFrame ) )

            {

                if ( aEvent.m_nEvent == SalEvent::UserEvent )

                    delete static_cast< ImplSVEvent* >( aEvent.m_pData );

                aResettableListGuard.lock();

                continue;

            }

            /*

            * Current policy is that scheduler tasks aren't allowed to throw an exception.

            * Because otherwise the exception is caught somewhere totally unrelated.

            * TODO Ideally we could capture a proper backtrace and feed this into breakpad,

            *   which is do-able, but requires writing some assembly.

            * See also Scheduler::CallbackTaskScheduling

            */

#ifdef IOS

            ProcessEvent( aEvent );

#else

            // the noexcept here means that (a) we abort and (b) debuggers will

            // likely trigger at the throw site instead of here, making the debugging

            // experience better when something goes wrong.

            auto process = [&aEvent, this] () noexcept { ProcessEvent(aEvent); };

            process();

#endif

            aResettableListGuard.lock();

            if (!bHandleAllCurrentEvents)

                break;

        }

        while( true );

    }

    if ( !m_bAllUserEventProcessedSignaled && !HasUserEvents_NoLock() )

    {

        m_bAllUserEventProcessedSignaled = true;

        TriggerAllUserEventsProcessed();

    }

    return bWasEvent;

}

void SalUserEventList::RemoveEvent( SalFrame* pFrame, void* pData, SalEvent nEvent )

{

    SalUserEvent aEvent( pFrame, pData, nEvent );

    std::unique_lock aGuard( m_aUserEventsMutex );

    auto it = std::find( m_aUserEvents.begin(), m_aUserEvents.end(), aEvent );

    if ( it != m_aUserEvents.end() )

    {

        m_aUserEvents.erase( it );

    }

    else

    {

        it = std::find( m_aProcessingUserEvents.begin(), m_aProcessingUserEvents.end(), aEvent );

        if ( it != m_aProcessingUserEvents.end() )

        {

            m_aProcessingUserEvents.erase( it );

        }

    }

    if ( !m_bAllUserEventProcessedSignaled && !HasUserEvents_NoLock() )

    {

        m_bAllUserEventProcessedSignaled = true;

        TriggerAllUserEventsProcessed();

    }

}

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