/* -*- 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 <maildispatcher.hxx>

#include <imaildsplistener.hxx>

#include <algorithm>

#include <com/sun/star/mail/MailException.hpp>

#include <utility>

#include <osl/diagnose.h>

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

typedef std::vector< ::rtl::Reference<IMailDispatcherListener> > MailDispatcherListenerContainer_t;

namespace /* private */

{

    class MailDeliveryNotifier

    {

    public:

        MailDeliveryNotifier(uno::Reference<mail::XMailMessage> message) :

            message_(std::move(message))

        {}

        void operator() (::rtl::Reference<IMailDispatcherListener> const & listener) const

        { listener->mailDelivered(message_); }

    private:

        uno::Reference<mail::XMailMessage> message_;

    };

    class MailDeliveryErrorNotifier

    {

    public:

        MailDeliveryErrorNotifier(

            ::rtl::Reference<MailDispatcher> xMailDispatcher,

            uno::Reference<mail::XMailMessage> message,

            OUString error_message) :

            m_mail_dispatcher(std::move(xMailDispatcher)),

            m_message(std::move(message)),

            m_error_message(std::move(error_message))

        {}

        void operator() (::rtl::Reference<IMailDispatcherListener> const & listener) const

        { listener->mailDeliveryError(m_mail_dispatcher, m_message, m_error_message); }

    private:

        ::rtl::Reference<MailDispatcher> m_mail_dispatcher;

        uno::Reference<mail::XMailMessage> m_message;

        OUString m_error_message;

    };

} // namespace private

MailDispatcher::MailDispatcher(uno::Reference<mail::XSmtpService> mailserver) :

    m_xMailserver(std::move( mailserver )),

    m_bActive( false ),

    m_bShutdownRequested( false )

{

    m_aWakeupCondition.reset();

    m_aRunCondition.reset();

    if (!create())

        throw uno::RuntimeException();

    // wait until the mail dispatcher thread is really alive

    // and has acquired a reference to this instance of the

    // class

    m_aRunCondition.wait();

}

MailDispatcher::~MailDispatcher()

{

}

void MailDispatcher::enqueueMailMessage(uno::Reference<mail::XMailMessage> const & message)

{

    ::osl::MutexGuard thread_status_guard( m_aThreadStatusMutex );

    ::osl::MutexGuard message_container_guard( m_aMessageContainerMutex );

    OSL_PRECOND( !m_bShutdownRequested, "MailDispatcher thread is shutting down already" );

    m_aXMessageList.push_back( message );

    if ( m_bActive )

        m_aWakeupCondition.set();

}

uno::Reference<mail::XMailMessage> MailDispatcher::dequeueMailMessage()

{

    ::osl::MutexGuard guard( m_aMessageContainerMutex );

    uno::Reference<mail::XMailMessage> message;

    if ( !m_aXMessageList.empty() )

    {

        message = m_aXMessageList.front();

        m_aXMessageList.pop_front();

    }

    return message;

}

void MailDispatcher::start()

{

    OSL_PRECOND(!isStarted(), "MailDispatcher is already started!");

    ::osl::ClearableMutexGuard thread_status_guard( m_aThreadStatusMutex );

    OSL_PRECOND(!m_bShutdownRequested, "MailDispatcher thread is shutting down already");

    if ( !m_bShutdownRequested )

    {

        m_bActive = true;

        m_aWakeupCondition.set();

        thread_status_guard.clear();

    }

}

void MailDispatcher::stop()

{

    OSL_PRECOND(isStarted(), "MailDispatcher not started!");

    ::osl::ClearableMutexGuard thread_status_guard( m_aThreadStatusMutex );

    OSL_PRECOND(!m_bShutdownRequested, "MailDispatcher thread is shutting down already");

    if (!m_bShutdownRequested)

    {

        m_bActive = false;

        m_aWakeupCondition.reset();

        thread_status_guard.clear();

    }

}

void MailDispatcher::shutdown()

{

    ::osl::MutexGuard thread_status_guard( m_aThreadStatusMutex );

    OSL_PRECOND(!m_bShutdownRequested, "MailDispatcher thread is shutting down already");

    m_bShutdownRequested = true;

    m_aWakeupCondition.set();

}

void MailDispatcher::addListener(::rtl::Reference<IMailDispatcherListener> const & listener)

{

    OSL_PRECOND(!m_bShutdownRequested, "MailDispatcher thread is shutting down already");

    ::osl::MutexGuard guard( m_aListenerContainerMutex );

    m_aListenerVector.push_back( listener );

}

std::vector< ::rtl::Reference<IMailDispatcherListener> > MailDispatcher::cloneListener()

{

    ::osl::MutexGuard guard( m_aListenerContainerMutex );

    return m_aListenerVector;

}

void MailDispatcher::sendMailMessageNotifyListener(uno::Reference<mail::XMailMessage> const & message)

{

    try

    {

        m_xMailserver->sendMailMessage( message );

        MailDispatcherListenerContainer_t aClonedListenerVector(cloneListener());

        std::for_each( aClonedListenerVector.begin(), aClonedListenerVector.end(),

                       MailDeliveryNotifier(message) );

    }

    catch (const mail::MailException& ex)

    {

        MailDispatcherListenerContainer_t aClonedListenerVector(cloneListener());

        std::for_each( aClonedListenerVector.begin(), aClonedListenerVector.end(),

                       MailDeliveryErrorNotifier(this, message, ex.Message) );

    }

    catch (const uno::RuntimeException& ex)

    {

        MailDispatcherListenerContainer_t aClonedListenerVector(cloneListener());

        std::for_each( aClonedListenerVector.begin(), aClonedListenerVector.end(),

                       MailDeliveryErrorNotifier(this, message, ex.Message) );

    }

}

void MailDispatcher::run()

{

    osl_setThreadName("MailDispatcher");

    // acquire a self reference in order to avoid race

    // conditions. The last client of this class must

    // call shutdown before releasing his last reference

    // to this class in order to shutdown this thread

    // which will release his (the very last reference

    // to the class and so force their destruction

    m_xSelfReference = this;

    // signal that the mail dispatcher thread is now alive

    m_aRunCondition.set();

    for(;;)

    {

        m_aWakeupCondition.wait();

        ::osl::ClearableMutexGuard thread_status_guard( m_aThreadStatusMutex );

        if ( m_bShutdownRequested )

            break;

        ::osl::ClearableMutexGuard message_container_guard( m_aMessageContainerMutex );

        if ( !m_aXMessageList.empty() )

        {

            thread_status_guard.clear();

            uno::Reference<mail::XMailMessage> message = m_aXMessageList.front();

            m_aXMessageList.pop_front();

            message_container_guard.clear();

            sendMailMessageNotifyListener( message );

        }

        else // idle - put ourself to sleep

        {

            m_aWakeupCondition.reset();

            message_container_guard.clear();

            thread_status_guard.clear();

            MailDispatcherListenerContainer_t aListenerListcloned( cloneListener() );

            for( const auto & l : aListenerListcloned)

                l->idle();

        }

    }

}

void MailDispatcher::onTerminated()

{

    //keep the reference until the end of onTerminated() because of the call order in the

    //_threadFunc() from osl/thread.hxx

    m_xSelfReference = nullptr;

}

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