src/app/clusters/concentration-measurement-server/ConcentrationMeasurementCluster.h

/*
 *
 *    Copyright (c) 2026 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 "concentration-measurement-cluster-objects.h"
#include <app/data-model-provider/ActionReturnStatus.h>
#include <app/data-model/Nullable.h>
#include <app/server-cluster/DefaultServerCluster.h>
#include <app/server-cluster/OptionalAttributeSet.h>
#include <lib/support/BitFlags.h>
#include <optional>

namespace chip {
namespace app {
namespace Clusters {
namespace ConcentrationMeasurement {

/**
 * Single implementation for all 10 aliased Concentration Measurement clusters.
 * The cluster owns all attribute storage. Push readings via Set*().
 */
class ConcentrationMeasurementCluster : public DefaultServerCluster
{
public:
    struct Config
    {
        ClusterId clusterId;
        BitFlags<Feature> features;
        MeasurementMediumEnum medium;
        MeasurementUnitEnum unit;
        DataModel::Nullable<float> minMeasured = DataModel::MakeNullable(0.0f);
        DataModel::Nullable<float> maxMeasured = DataModel::Nullable<float>();
        std::optional<float> uncertainty;
    };

    using OptionalAttributeSet =
        app::OptionalAttributeSet<Attributes::MeasuredValue::Id, Attributes::MinMeasuredValue::Id, Attributes::MaxMeasuredValue::Id,
                                  Attributes::Uncertainty::Id, Attributes::MeasurementUnit::Id, Attributes::PeakMeasuredValue::Id,
                                  Attributes::PeakMeasuredValueWindow::Id, Attributes::AverageMeasuredValue::Id,
                                  Attributes::AverageMeasuredValueWindow::Id, Attributes::LevelValue::Id>;

    ConcentrationMeasurementCluster(EndpointId endpointId, const Config & config);

    CHIP_ERROR Attributes(const ConcreteClusterPath & path, ReadOnlyBufferBuilder<DataModel::AttributeEntry> & builder) override;

    DataModel::ActionReturnStatus ReadAttribute(const DataModel::ReadAttributeRequest & request,
                                                AttributeValueEncoder & encoder) override;

    // Push a new sensor reading. Validates range, stores, and notifies subscribers.
    // Returns CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE if the relevant feature flag was not set at construction.
    CHIP_ERROR SetMeasuredValue(DataModel::Nullable<float> value);
    CHIP_ERROR SetPeakMeasuredValue(DataModel::Nullable<float> value);
    CHIP_ERROR SetPeakMeasuredValueWindow(uint32_t value);
    CHIP_ERROR SetAverageMeasuredValue(DataModel::Nullable<float> value);
    CHIP_ERROR SetAverageMeasuredValueWindow(uint32_t value);
    CHIP_ERROR SetLevelValue(LevelValueEnum value);

private:
    static constexpr uint32_t kWindowMaxSeconds = 604800;

    CHIP_ERROR SetNullableFloatValue(DataModel::Nullable<float> value, Feature requiredFeature,
                                     DataModel::Nullable<float> & storage, AttributeId attr);
    CHIP_ERROR SetWindowValue(uint32_t value, Feature requiredFeature, uint32_t & storage, AttributeId attr);

    const BitFlags<Feature> mFeatures;
    const OptionalAttributeSet mOptionalAttributeSet;

    MeasurementMediumEnum mMedium;
    MeasurementUnitEnum mUnit;
    DataModel::Nullable<float> mMinMeasuredValue;
    DataModel::Nullable<float> mMaxMeasuredValue;
    std::optional<float> mUncertainty;
    DataModel::Nullable<float> mMeasuredValue;
    DataModel::Nullable<float> mPeakMeasuredValue;
    uint32_t mPeakMeasuredValueWindow = 0;
    DataModel::Nullable<float> mAverageMeasuredValue;
    uint32_t mAverageMeasuredValueWindow = 0;
    LevelValueEnum mLevelValue           = LevelValueEnum::kUnknown;
};

} // namespace ConcentrationMeasurement
} // namespace Clusters
} // namespace app
} // namespace chip