/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  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
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file includes definitions for responding to Energy Scan Requests.
 */

#ifndef ENERGY_SCAN_SERVER_HPP_
#define ENERGY_SCAN_SERVER_HPP_

#include <openthread-core-config.h>
#include <openthread-types.h>
#include <coap/coap_client.hpp>
#include <coap/coap_server.hpp>
#include <common/timer.hpp>
#include <net/ip6_address.hpp>
#include <net/udp6.hpp>

namespace Thread {

class MeshForwarder;
class ThreadLastTransactionTimeTlv;
class ThreadMeshLocalEidTlv;
class ThreadNetif;
class ThreadTargetTlv;

/**
 * This class implements handling Energy Scan Requests.
 *
 */
class EnergyScanServer
{
public:
    /**
     * This constructor initializes the object.
     *
     */
    EnergyScanServer(ThreadNetif &aThreadNetif);

private:
    enum
    {
        kScanDelay   = 1000,  ///< SCAN_DELAY (milliseconds)
        kReportDelay = 500,   ///< Delay before sending a report (milliseconds)
    };

    static void HandleRequest(void *aContext, otCoapHeader *aHeader, otMessage aMessage,
                              const otMessageInfo *aMessageInfo);
    void HandleRequest(Coap::Header &aHeader, Message &aMessage, const Ip6::MessageInfo &aMessageInfo);

    static void HandleScanResult(void *aContext, otEnergyScanResult *aResult);
    void HandleScanResult(otEnergyScanResult *aResult);

    static void HandleTimer(void *aContext);
    void HandleTimer(void);

    static void HandleNetifStateChanged(uint32_t aFlags, void *aContext);
    void HandleNetifStateChanged(uint32_t aFlags);

    ThreadError SendReport(void);
    ThreadError SendResponse(const Coap::Header &aRequestHeader, const Ip6::MessageInfo &aRequestMessageInfo);

    Ip6::Address mCommissioner;
    uint32_t mChannelMask;
    uint32_t mChannelMaskCurrent;
    uint16_t mPeriod;
    uint16_t mScanDuration;
    uint8_t mCount;
    bool mActive;

    int8_t mScanResults[OPENTHREAD_CONFIG_MAX_ENERGY_RESULTS];
    uint8_t mScanResultsLength;

    Timer mTimer;

    Ip6::NetifCallback mNetifCallback;

    Coap::Resource mEnergyScan;
    Coap::Server &mCoapServer;
    Coap::Client &mCoapClient;

    ThreadNetif &mNetif;
};

/**
 * @}
 */

}  // namespace Thread

#endif  // ENERGY_SCAN_SERVER_HPP_
