/*  Copyright (C) 2023-2024 Frank Ertl

    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.withingssteelhr.communication.conversation;

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

import java.util.ArrayList;
import java.util.List;

import nodomain.freeyourgadget.gadgetbridge.GBApplication;
import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
import nodomain.freeyourgadget.gadgetbridge.database.DBHelper;
import nodomain.freeyourgadget.gadgetbridge.devices.withingssteelhr.WithingsSteelHRSampleProvider;
import nodomain.freeyourgadget.gadgetbridge.entities.WithingsSteelHRActivitySample;
import nodomain.freeyourgadget.gadgetbridge.model.ActivityKind;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.WithingsSteelHRDeviceSupport;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.activity.ActivityEntry;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.activity.WithingsActivityType;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.WorkoutType;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleCalories;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleCalories2;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleDuration;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleMovement;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleSleep;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivitySampleTime;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.ActivityHeartrate;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.WithingsStructure;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.datastructures.WithingsStructureType;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.message.Message;
import nodomain.freeyourgadget.gadgetbridge.service.devices.withingssteelhr.communication.message.WithingsMessageType;
import nodomain.freeyourgadget.gadgetbridge.util.GB;

public class ActivitySampleHandler extends AbstractResponseHandler {

    private static final Logger logger = LoggerFactory.getLogger(ActivitySampleHandler.class);
    private ActivityEntry activityEntry;
    private List<ActivityEntry> activityEntries = new ArrayList<>();
    private List<ActivityEntry> heartrateEntries = new ArrayList<>();

    public ActivitySampleHandler(WithingsSteelHRDeviceSupport support) {
        super(support);
    }

    @Override
    public void handleResponse(Message response) {
        List<WithingsStructure> data = response.getDataStructures();
        if (data != null) {
            handleActivityData(data, response.getType());
        }
    }

    public void onSyncFinished() {
        mergeHeartrateSamplesIntoActivitySammples();
        saveData();
    }

    private void handleActivityData(List<WithingsStructure> dataList, short activityType) {
        for (WithingsStructure data : dataList) {
            switch (data.getType()) {
                case WithingsStructureType.ACTIVITY_SAMPLE_TIME:
                    handleTimestamp(data, activityType);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_DURATION:
                    handleDuration(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_MOVEMENT:
                    handleMovement(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_CALORIES:
                    handleCalories1(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_CALORIES_2:
                    handleCalories2(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_SLEEP:
                    handleSleep(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_WALK:
                    handleWalk(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_RUN:
                    handleRun(data);
                    break;
                case WithingsStructureType.ACTIVITY_SAMPLE_SWIM:
                    handleSwim(data);
                    break;
                case WithingsStructureType.ACTIVITY_HR:
                    handleHeartrate(data);
                    break;
                case WithingsStructureType.WORKOUT_TYPE:
                    handleWorkoutType(data);
                    break;
                default:
                    logger.info("Received yet unhandled activity data of type '{}' with data '{}'.", data.getType(), GB.hexdump(data.getRawData()));
            }
        }

        if (activityEntry != null) {
            addToList(activityEntry);
        }

    }

    private void handleTimestamp(WithingsStructure data, short activityType) {
        if (activityEntry != null) {
            addToList(activityEntry);
        }

        activityEntry = new ActivityEntry();
        activityEntry.setIsHeartrate(activityType == WithingsMessageType.GET_HEARTRATE_SAMPLES);
        activityEntry.setTimestamp((int) (((ActivitySampleTime) data).getDate().getTime() / 1000));
    }

    private void handleWorkoutType(WithingsStructure data) {
        WithingsActivityType activityType = WithingsActivityType.fromCode(((WorkoutType) data).getActivityType());
        activityEntry.setRawKind(activityType.toActivityKind().getCode());
    }

    private void handleDuration(WithingsStructure data) {
        activityEntry.setDuration(((ActivitySampleDuration) data).getDuration());
    }

    private void handleHeartrate(WithingsStructure data) {
        activityEntry.setIsHeartrate(((ActivityHeartrate) data).getHeartrate());
    }

    private void handleMovement(WithingsStructure data) {
        activityEntry.setRawKind(ActivityKind.UNKNOWN.getCode());
        activityEntry.setSteps(((ActivitySampleMovement) data).getSteps());
        activityEntry.setDistance(((ActivitySampleMovement) data).getDistance());
    }

    private void handleWalk(WithingsStructure data) {
        activityEntry.setRawKind(ActivityKind.WALKING.getCode());
    }

    private void handleRun(WithingsStructure data) {
        activityEntry.setRawKind(ActivityKind.RUNNING.getCode());
    }

    private void handleSwim(WithingsStructure data) {
        activityEntry.setRawKind(ActivityKind.SWIMMING.getCode());
    }

    private void handleSleep(WithingsStructure data) {
        ActivityKind sleepType;
        switch (((ActivitySampleSleep) data).getSleepType()) {
            case 0:
                sleepType = ActivityKind.LIGHT_SLEEP;
                activityEntry.setRawIntensity(10);
                break;
            case 2:
                sleepType = ActivityKind.DEEP_SLEEP;
                activityEntry.setRawIntensity(70);
                break;
            case 3:
                sleepType = ActivityKind.REM_SLEEP;
                activityEntry.setRawIntensity(80);
                break;
            default:
                sleepType = ActivityKind.LIGHT_SLEEP;
                activityEntry.setRawIntensity(50);
        }

        activityEntry.setRawKind(sleepType.getCode());
    }

    private void handleCalories1(WithingsStructure data) {
        activityEntry.setRawIntensity(((ActivitySampleCalories) data).getMet());
        activityEntry.setCalories(((ActivitySampleCalories) data).getCalories());
    }

    private void handleCalories2(WithingsStructure data) {
        activityEntry.setRawIntensity(((ActivitySampleCalories2) data).getMet());
        activityEntry.setCalories(((ActivitySampleCalories2) data).getCalories());

    }

    private void addToList(ActivityEntry activityEntry) {
        if (activityEntry.isHeartrate()) {
            heartrateEntries.add(activityEntry);
        } else {
            activityEntries.add(activityEntry);
        }
    }

    private void saveData() {
        List<WithingsSteelHRActivitySample> activitySamples = new ArrayList<>();
        for (ActivityEntry activityEntry : activityEntries) {
            convertToSampleAndAddToList(activitySamples, activityEntry);
        }
        for (ActivityEntry activityEntry : heartrateEntries) {
            convertToSampleAndAddToList(activitySamples, activityEntry);
        }

        writeToDB(activitySamples);
    }

    private void writeToDB(List<WithingsSteelHRActivitySample> activitySamples) {
        try (DBHandler dbHandler = GBApplication.acquireDB()) {
            Long userId = DBHelper.getUser(dbHandler.getDaoSession()).getId();
            Long deviceId = DBHelper.getDevice(device, dbHandler.getDaoSession()).getId();
            WithingsSteelHRSampleProvider provider = new WithingsSteelHRSampleProvider(device, dbHandler.getDaoSession());
            for (WithingsSteelHRActivitySample sample : activitySamples) {
                sample.setDeviceId(deviceId);
                sample.setUserId(userId);
            }
            provider.addGBActivitySamples(activitySamples.toArray(new WithingsSteelHRActivitySample[0]));
        } catch (Exception ex) {
            logger.warn("Error saving activity data: " + ex.getLocalizedMessage());
        }
    }

    private void mergeHeartrateSamplesIntoActivitySammples() {
        for (ActivityEntry heartrateEntry : heartrateEntries) {
            for (ActivityEntry activityEntry : activityEntries) {
                if (doActivitiesOverlap(heartrateEntry, activityEntry)) {
                    updateHeartrateEntry(heartrateEntry, activityEntry);
                }
            }
        }
    }

    private boolean doActivitiesOverlap(ActivityEntry heartrateEntry, ActivityEntry activityEntry) {
        return activityEntry.getTimestamp() <= heartrateEntry.getTimestamp()
                && (activityEntry.getTimestamp() + activityEntry.getDuration()) >= heartrateEntry.getTimestamp();
    }

    private void updateHeartrateEntry(ActivityEntry heartRateEntry, ActivityEntry activityEntry) {
        heartRateEntry.setRawKind(activityEntry.getRawKind());
        heartRateEntry.setRawIntensity(activityEntry.getRawIntensity());
        heartRateEntry.setDuration(activityEntry.getDuration() - (heartRateEntry.getTimestamp() - activityEntry.getTimestamp()));
        // If timestamps are exactly the same and only then, the heartrate entry would overwrite the activity entry in the DB, so we set more values.
        // If we would do so everytime, steps and so on would be multiplicated.
        if (heartRateEntry.getTimestamp() == activityEntry.getTimestamp()) {
            heartRateEntry.setSteps(activityEntry.getSteps());
            heartRateEntry.setDistance(activityEntry.getDistance());
            heartRateEntry.setCalories(activityEntry.getCalories());
        }
    }

    private void convertToSampleAndAddToList(List<WithingsSteelHRActivitySample> activitySamples, ActivityEntry activityEntry) {
        WithingsSteelHRActivitySample sample = new WithingsSteelHRActivitySample();
        sample.setTimestamp(activityEntry.getTimestamp());
        sample.setDuration(activityEntry.getDuration());
        sample.setHeartRate(activityEntry.getHeartrate());
        sample.setSteps(activityEntry.getSteps());
        sample.setRawKind(activityEntry.getRawKind());
        sample.setCalories(activityEntry.getCalories());
        sample.setDistance(activityEntry.getDistance());
        sample.setRawIntensity(activityEntry.getRawIntensity());
        activitySamples.add(sample);
    }
}