/*  Copyright (C) 2025 José Rebelo

    This file is part of Gadgetbridge.

    Gadgetbridge is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Gadgetbridge is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>. */
package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.fetch;

import android.widget.Toast;

import androidx.annotation.StringRes;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.GregorianCalendar;
import java.util.List;

import nodomain.freeyourgadget.gadgetbridge.GBApplication;
import nodomain.freeyourgadget.gadgetbridge.R;
import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
import nodomain.freeyourgadget.gadgetbridge.devices.GenericHrvValueSampleProvider;
import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiCoordinator;
import nodomain.freeyourgadget.gadgetbridge.entities.DaoSession;
import nodomain.freeyourgadget.gadgetbridge.entities.GenericHrvValueSample;
import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiFetcher;
import nodomain.freeyourgadget.gadgetbridge.util.GB;

/**
 * An operation that fetches HRV data.
 */
public class FetchHrvOperation extends AbstractRepeatingFetchOperation {
    private static final Logger LOG = LoggerFactory.getLogger(FetchHrvOperation.class);

    public FetchHrvOperation(final HuamiFetcher fetcher) {
        super(fetcher, HuamiFetchDataType.HRV);
    }

    @StringRes
    @Override
    public int taskDescription() {
        return R.string.busy_task_fetch_hrv_data;
    }

    @Override
    protected boolean handleActivityData(final GregorianCalendar timestamp, final byte[] bytes) {
        if (bytes.length % 6 != 0) {
            LOG.error("Unexpected length for hrv data {}, not divisible by 6", bytes.length);
            return false;
        }

        final ByteBuffer buf = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);

        final List<GenericHrvValueSample> samples = new ArrayList<>();

        while (buf.hasRemaining()) {
            final long timestampSeconds = buf.getInt();
            final byte unk1 = buf.get();
            final int hrv = buf.get() & 0xff;

            timestamp.setTimeInMillis(timestampSeconds * 1000L);

            LOG.trace("HRV at {}: {} unk1={}", timestamp.getTime(), hrv, unk1);

            final GenericHrvValueSample sample = new GenericHrvValueSample();
            sample.setTimestamp(timestamp.getTimeInMillis());
            sample.setValue(hrv);
            samples.add(sample);
        }

        return persistSamples(samples);
    }

    protected boolean persistSamples(final List<GenericHrvValueSample> samples) {
        try (DBHandler handler = GBApplication.acquireDB()) {
            final DaoSession session = handler.getDaoSession();

            final HuamiCoordinator coordinator = (HuamiCoordinator) getDevice().getDeviceCoordinator();
            final GenericHrvValueSampleProvider sampleProvider = coordinator.getHrvValueSampleProvider(getDevice(), session);

            sampleProvider.persistSamples(samples, getContext());
        } catch (final Exception e) {
            GB.toast(getContext(), "Error saving hrv samples", Toast.LENGTH_LONG, GB.ERROR, e);
            return false;
        }

        return true;
    }

    @Override
    protected String getLastSyncTimeKey() {
        return "lastHrvTimeMillis";
    }
}
