src/app/clusters/unit-localization-server/UnitLocalizationCluster.h

/*
 *
 *    Copyright (c) 2025 Project CHIP Authors
 *    All rights reserved.
 *
 *    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 <app/server-cluster/DefaultServerCluster.h>
#include <app/server-cluster/OptionalAttributeSet.h>
#include <clusters/UnitLocalization/Metadata.h>

#include <app-common/zap-generated/cluster-enums.h>
#include <app-common/zap-generated/ids/Attributes.h>
#include <app-common/zap-generated/ids/Clusters.h>
#include <app/AttributeAccessInterface.h>
#include <app/data-model/List.h>
#include <cstdint>
#include <lib/core/CHIPError.h>

namespace chip {
namespace app {
namespace Clusters {
namespace UnitLocalization {

inline constexpr uint8_t kMinSupportedLocalizationUnits = 2;
inline constexpr uint8_t kMaxSupportedLocalizationUnits = 3;

class UnitLocalizationCluster : public DefaultServerCluster
{
public:
    UnitLocalizationCluster(EndpointId endpointId, const BitFlags<UnitLocalization::Feature> features) :
        DefaultServerCluster({ endpointId, UnitLocalization::Id }), mFeatures(features)
    {}

    // ServerClusterInterface
    CHIP_ERROR Startup(ServerClusterContext & context) override;
    DataModel::ActionReturnStatus ReadAttribute(const DataModel::ReadAttributeRequest & request,
                                                AttributeValueEncoder & encoder) override;
    DataModel::ActionReturnStatus WriteAttribute(const DataModel::WriteAttributeRequest & request,
                                                 AttributeValueDecoder & decoder) override;
    CHIP_ERROR Attributes(const ConcreteClusterPath & path, ReadOnlyBufferBuilder<DataModel::AttributeEntry> & builder) override;

    CHIP_ERROR SetSupportedTemperatureUnits(DataModel::List<TempUnitEnum> & units);
    const DataModel::List<TempUnitEnum> & GetSupportedTemperatureUnits(void) { return mSupportedTemperatureUnits; }
    TempUnitEnum GetTemperatureUnit(void) { return mTemperatureUnit; }
    CHIP_ERROR SetTemperatureUnit(TempUnitEnum unit);

private:
    DataModel::List<TempUnitEnum> mSupportedTemperatureUnits{ DataModel::List<TempUnitEnum>(mUnitsBuffer) };
    TempUnitEnum mUnitsBuffer[kMaxSupportedLocalizationUnits] = { TempUnitEnum::kFahrenheit, TempUnitEnum::kCelsius,
                                                                  TempUnitEnum::kKelvin };
    TempUnitEnum mTemperatureUnit                             = TempUnitEnum::kCelsius;
    const BitFlags<UnitLocalization::Feature> mFeatures;
};

} // namespace UnitLocalization
} // namespace Clusters
} // namespace app
} // namespace chip