/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    Licensed 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
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#pragma once

#include <credentials/GroupDataProvider.h>
#include <messaging/ExchangeMgr.h>
#include <messaging/ReliableMessageProtocolConfig.h>
#include <protocols/secure_channel/CASESession.h>

namespace chip {

class CASEClient;

struct CASEClientInitParams
{
    SessionManager * sessionManager                                    = nullptr;
    SessionResumptionStorage * sessionResumptionStorage                = nullptr;
    Credentials::CertificateValidityPolicy * certificateValidityPolicy = nullptr;
    Messaging::ExchangeManager * exchangeMgr                           = nullptr;
    FabricTable * fabricTable                                          = nullptr;
    Credentials::GroupDataProvider * groupDataProvider                 = nullptr;

    // mrpLocalConfig should not generally be set to anything other than
    // NullOptional.  Doing that can lead to different parts of the system
    // claiming different MRP parameters for the same node.
    Optional<ReliableMessageProtocolConfig> mrpLocalConfig = NullOptional;

    // The minimum backoff interval for LIT devices. This is used to calculate the sigma1
    // retransmission timeout for LIT devices, ensuring it's at least `minimumLITBackoffInterval`.
    // Specifically, the timeout is `max(LIT activeRetransTimeout,
    // minimumLITBackoffInterval)`. This prevents issues with MRP retransmission in Thread
    // networks when activeRetransTimeout is too small.
    // Note: Setting this parameter to a nonzero value is not spec-compliant.
    Optional<uint32_t> minimumLITBackoffInterval = NullOptional;

    CHIP_ERROR Validate() const
    {
        // sessionResumptionStorage can be nullptr when resumption is disabled.
        // certificateValidityPolicy is optional, too.
        VerifyOrReturnError(sessionManager != nullptr, CHIP_ERROR_INCORRECT_STATE);
        VerifyOrReturnError(exchangeMgr != nullptr, CHIP_ERROR_INCORRECT_STATE);
        VerifyOrReturnError(fabricTable != nullptr, CHIP_ERROR_INCORRECT_STATE);
        VerifyOrReturnError(groupDataProvider != nullptr, CHIP_ERROR_INCORRECT_STATE);

        return CHIP_NO_ERROR;
    }
};

class DLL_EXPORT CASEClient
{
public:
    void SetRemoteMRPIntervals(const ReliableMessageProtocolConfig & remoteMRPConfig);

    const ReliableMessageProtocolConfig & GetRemoteMRPIntervals();

    CHIP_ERROR EstablishSession(const CASEClientInitParams & params, const ScopedNodeId & peer,
                                const Transport::PeerAddress & peerAddress, const ReliableMessageProtocolConfig & remoteMRPConfig,
                                SessionEstablishmentDelegate * delegate);

private:
    CASESession mCASESession;
};

} // namespace chip