/*
 *  Copyright (c) 2017, 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
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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 contains definitions for a simple CLI CoAP server and client.
 */

#ifndef OT_CLI_CLI_COAP_HPP_
#define OT_CLI_CLI_COAP_HPP_

#include "openthread-core-config.h"

#if OPENTHREAD_CONFIG_COAP_API_ENABLE

#include <openthread/coap.h>

#include "cli/cli_utils.hpp"

namespace ot {
namespace Cli {

/**
 * Implements the CLI CoAP server and client.
 */
class Coap : private Utils
{
public:
    /**
     * Constructor
     *
     * @param[in]  aInstance            The OpenThread Instance.
     * @param[in]  aOutputImplementer   An `OutputImplementer`.
     */
    Coap(otInstance *aInstance, OutputImplementer &aOutputImplementer);

    /**
     * Processes a CLI sub-command.
     *
     * @param[in]  aArgs     An array of command line arguments.
     *
     * @retval OT_ERROR_NONE              Successfully executed the CLI command.
     * @retval OT_ERROR_PENDING           The CLI command was successfully started but final result is pending.
     * @retval OT_ERROR_INVALID_COMMAND   Invalid or unknown CLI command.
     * @retval OT_ERROR_INVALID_ARGS      Invalid arguments.
     * @retval ...                        Error during execution of the CLI command.
     */
    otError Process(Arg aArgs[]);

private:
    static constexpr uint16_t kMaxUriLength  = 32;
    static constexpr uint16_t kMaxBufferSize = 16;

    using Command = CommandEntry<Coap>;

#if OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
    enum BlockType : uint8_t
    {
        kBlockType1,
        kBlockType2,
    };
#endif

    template <CommandId kCommandId> otError Process(Arg aArgs[]);

#if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
    otError CancelResourceSubscription(bool aSendCancelMessage);
    void    CancelSubscriber(void);
#endif

    void PrintPayload(otMessage *aMessage);

#if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
    otError ProcessRequest(Arg aArgs[], otCoapCode aCoapCode, bool aCoapObserve = false);
#else
    otError ProcessRequest(Arg aArgs[], otCoapCode aCoapCode);
#endif

    static void HandleRequest(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
    void        HandleRequest(otMessage *aMessage, const otMessageInfo *aMessageInfo);

#if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
    // Maximum number of non-confirmable (NON) notifications that are sent, before sending a confirmable notification
    // for validating that the client is still there and still interested. The value (5) matches libcoap's
    // implementation. The mechanism satisfies RFC 7641 requirements for interspersing confirmable (CON) notifications
    // among non-confirmable (NON) notifications to validate the client.
    static constexpr uint8_t kMaxNonNotificationsBeforeValidation = 5;
    static void              HandleNotificationAck(void                *aContext,
                                                   otMessage           *aMessage,
                                                   const otMessageInfo *aMessageInfo,
                                                   otError              aError);
    void HandleNotificationAck(otMessage *aMessage, const otMessageInfo *aMessageInfo, otError aError);
#endif

    static void HandleResponse(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo, otError aError);
    void        HandleResponse(otMessage *aMessage, const otMessageInfo *aMessageInfo, otError aError);

#if OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE

    static otError BlockwiseReceiveHook(void          *aContext,
                                        const uint8_t *aBlock,
                                        uint32_t       aPosition,
                                        uint16_t       aBlockLength,
                                        bool           aMore,
                                        uint32_t       aTotalLength);
    otError        BlockwiseReceiveHook(const uint8_t *aBlock,
                                        uint32_t       aPosition,
                                        uint16_t       aBlockLength,
                                        bool           aMore,
                                        uint32_t       aTotalLength);
    static otError BlockwiseTransmitHook(void     *aContext,
                                         uint8_t  *aBlock,
                                         uint32_t  aPosition,
                                         uint16_t *aBlockLength,
                                         bool     *aMore);
    otError        BlockwiseTransmitHook(uint8_t *aBlock, uint32_t aPosition, uint16_t *aBlockLength, bool *aMore);
#endif

    const otCoapTxParameters *GetRequestTxParameters(void) const
    {
        return mUseDefaultRequestTxParameters ? nullptr : &mRequestTxParameters;
    }

    const otCoapTxParameters *GetResponseTxParameters(void) const
    {
        return mUseDefaultResponseTxParameters ? nullptr : &mResponseTxParameters;
    }

    bool mUseDefaultRequestTxParameters;
    bool mUseDefaultResponseTxParameters;

    otCoapTxParameters mRequestTxParameters;
    otCoapTxParameters mResponseTxParameters;

#if OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
    otCoapBlockwiseResource mResource;
#else
    otCoapResource mResource;
#endif
#if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
    otIp6Address mRequestAddr;
    otSockAddr   mSubscriberSock;
    char         mRequestUri[kMaxUriLength];
    otCoapToken  mRequestToken;
    otCoapToken  mSubscriberToken;
#endif
    char mUriPath[kMaxUriLength];
    char mResourceContent[kMaxBufferSize];
#if OPENTHREAD_CONFIG_COAP_OBSERVE_API_ENABLE
    uint32_t mObserveSerial;
    bool     mSubscriberConfirmableNotifications;
    bool     mValidateObserveClient;
    uint8_t  mNotificationSeriesCount;
#endif
#if OPENTHREAD_CONFIG_COAP_BLOCKWISE_TRANSFER_ENABLE
    uint32_t mBlockCount;
#endif
};

} // namespace Cli
} // namespace ot

#endif // OPENTHREAD_CONFIG_COAP_API_ENABLE

#endif // OT_CLI_CLI_COAP_HPP_
