/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
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 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file implements the Announce Begin Server.
 */

#define WPP_NAME "announce_begin_server.tmh"

#include <openthread/config.h>

#include "announce_begin_server.hpp"

#include <openthread/platform/radio.h>

#include "openthread-instance.h"
#include "coap/coap_header.hpp"
#include "common/code_utils.hpp"
#include "common/debug.hpp"
#include "common/logging.hpp"
#include "meshcop/meshcop_tlvs.hpp"
#include "thread/thread_netif.hpp"
#include "thread/thread_uri_paths.hpp"

using ot::Encoding::BigEndian::HostSwap32;

namespace ot {

AnnounceBeginServer::AnnounceBeginServer(ThreadNetif &aThreadNetif) :
    ThreadNetifLocator(aThreadNetif),
    mChannelMask(0),
    mPeriod(0),
    mCount(0),
    mChannel(0),
    mTimer(aThreadNetif.GetIp6().mTimerScheduler, &AnnounceBeginServer::HandleTimer, this),
    mAnnounceBegin(OT_URI_PATH_ANNOUNCE_BEGIN, &AnnounceBeginServer::HandleRequest, this)
{
    aThreadNetif.GetCoap().AddResource(mAnnounceBegin);
}

otError AnnounceBeginServer::SendAnnounce(uint32_t aChannelMask)
{
    return SendAnnounce(aChannelMask, kDefaultCount, kDefaultPeriod);
}

otError AnnounceBeginServer::SendAnnounce(uint32_t aChannelMask, uint8_t aCount, uint16_t aPeriod)
{
    otError error = OT_ERROR_NONE;

    mChannelMask = aChannelMask;
    mCount = aCount;
    mPeriod = aPeriod;
    mChannel = OT_RADIO_CHANNEL_MIN;

    while ((mChannelMask & (1 << mChannel)) == 0)
    {
        mChannel++;
        VerifyOrExit(mChannel <= OT_RADIO_CHANNEL_MAX, error = OT_ERROR_INVALID_ARGS);
    }

    mTimer.Start(mPeriod);

exit:
    return error;
}

void AnnounceBeginServer::HandleRequest(void *aContext, otCoapHeader *aHeader, otMessage *aMessage,
                                        const otMessageInfo *aMessageInfo)
{
    static_cast<AnnounceBeginServer *>(aContext)->HandleRequest(
        *static_cast<Coap::Header *>(aHeader), *static_cast<Message *>(aMessage),
        *static_cast<const Ip6::MessageInfo *>(aMessageInfo));
}
void AnnounceBeginServer::HandleRequest(Coap::Header &aHeader, Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
    MeshCoP::ChannelMask0Tlv channelMask;
    MeshCoP::CountTlv count;
    MeshCoP::PeriodTlv period;
    Ip6::MessageInfo responseInfo(aMessageInfo);

    VerifyOrExit(aHeader.GetCode() == OT_COAP_CODE_POST);

    SuccessOrExit(MeshCoP::Tlv::GetTlv(aMessage, MeshCoP::Tlv::kChannelMask, sizeof(channelMask), channelMask));
    VerifyOrExit(channelMask.IsValid());

    SuccessOrExit(MeshCoP::Tlv::GetTlv(aMessage, MeshCoP::Tlv::kCount, sizeof(count), count));
    VerifyOrExit(count.IsValid());

    SuccessOrExit(MeshCoP::Tlv::GetTlv(aMessage, MeshCoP::Tlv::kPeriod, sizeof(period), period));
    VerifyOrExit(period.IsValid());

    SendAnnounce(channelMask.GetMask(), count.GetCount(), period.GetPeriod());

    if (aHeader.IsConfirmable() && !aMessageInfo.GetSockAddr().IsMulticast())
    {
        SuccessOrExit(GetNetif().GetCoap().SendEmptyAck(aHeader, responseInfo));
        otLogInfoMeshCoP(GetInstance(), "sent announce begin response");
    }

exit:
    return;
}

void AnnounceBeginServer::HandleTimer(Timer &aTimer)
{
    GetOwner(aTimer).HandleTimer();
}

void AnnounceBeginServer::HandleTimer(void)
{
    GetNetif().GetMle().SendAnnounce(mChannel++, false);

    while (mCount > 0)
    {
        if (mChannelMask & (1 << mChannel))
        {
            mTimer.Start(mPeriod);
            break;
        }

        mChannel++;

        if (mChannel > OT_RADIO_CHANNEL_MAX)
        {
            mChannel = OT_RADIO_CHANNEL_MIN;
            mCount--;
        }
    }
}

AnnounceBeginServer &AnnounceBeginServer::GetOwner(const Context &aContext)
{
#if OPENTHREAD_ENABLE_MULTIPLE_INSTANCES
    AnnounceBeginServer &server = *static_cast<AnnounceBeginServer *>(aContext.GetContext());
#else
    AnnounceBeginServer &server = otGetThreadNetif().GetAnnounceBeginServer();
    OT_UNUSED_VARIABLE(aContext);
#endif
    return server;
}

}  // namespace ot