package de.dennisguse.opentracks.sensors;

import static org.junit.Assert.assertEquals;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_DISABLED;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_ENABLED;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_NONE;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_SIGNAL_BAD;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_SIGNAL_FIX;
import static de.dennisguse.opentracks.sensors.GpsStatusValue.GPS_SIGNAL_LOST;

import android.content.Context;
import android.location.Location;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;

import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;

import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;

import de.dennisguse.opentracks.data.models.Distance;
import de.dennisguse.opentracks.data.models.Position;

@RunWith(AndroidJUnit4.class)
public class GpsStatusTest {

    private final Context context = ApplicationProvider.getApplicationContext();

    @BeforeClass
    public static void preSetUp() {
        // Prepare looper for Android's message queue
        if (Looper.myLooper() == null) Looper.prepare();
    }

    private final static Location badFix = new Location("gps");
    private final static Location ok = new Location("gps");

    static {

        badFix.setAccuracy(50);

        ok.setAccuracy(10);
    }

    @Test
    public void testStartDisabledEnabledStop() {
        ArrayList<GpsStatusValue> statusList = new ArrayList<>();

        // given
        GpsStatusManager subject = new GpsStatusManager(context, statusList::add, new Handler());

        // when / then
        subject.start();
        assertEquals(List.of(GPS_ENABLED), statusList);

        subject.onGpsDisabled();
        assertEquals(List.of(GPS_ENABLED, GPS_DISABLED), statusList);

        subject.onGpsEnabled();
        assertEquals(List.of(GPS_ENABLED, GPS_DISABLED, GPS_ENABLED), statusList);

        subject.stop();
        assertEquals(List.of(GPS_ENABLED, GPS_DISABLED, GPS_ENABLED, GPS_NONE), statusList);
    }

    @Test
    public void testStartBadfixOk() {
        ArrayList<GpsStatusValue> statusList = new ArrayList<>();

        // given
        GpsStatusManager subject = new GpsStatusManager(context, statusList::add, new Handler());
        subject.onRecordingDistanceChanged(Distance.of(10));

        // when / then
        subject.start();
        subject.onNewTrackPoint(Position.of(badFix, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_BAD), statusList);

        subject.onNewTrackPoint(Position.of(ok, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_BAD, GPS_SIGNAL_FIX), statusList);

        subject.onNewTrackPoint(Position.of(ok, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_BAD, GPS_SIGNAL_FIX), statusList);

        subject.onNewTrackPoint(Position.of(badFix, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_BAD, GPS_SIGNAL_FIX, GPS_SIGNAL_BAD), statusList);
    }

    @Test
    public void testStartSignalLost() {
        ArrayList<GpsStatusValue> statusList = new ArrayList<>();

        // given
        GpsStatusManager subject = new GpsStatusManager(context, statusList::add, new Handler());
        subject.onRecordingDistanceChanged(Distance.of(10));
        subject.onMinSamplingIntervalChanged(GpsStatusManager.SIGNAL_LOST_THRESHOLD.multipliedBy(-1));

        // when / then
        subject.start();
        subject.onNewTrackPoint(Position.of(ok, Instant.now().minusMillis(1000)));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX), statusList);

        subject.determineGpsStatusByTime(Instant.now());
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX, GPS_SIGNAL_LOST), statusList);

        subject.onNewTrackPoint(Position.of(ok, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX, GPS_SIGNAL_LOST, GPS_SIGNAL_FIX), statusList);
    }

    @Test
    public void testStartSignalLostByTimer() throws InterruptedException {
        ArrayList<GpsStatusValue> statusList = new ArrayList<>();

        final HandlerThread handlerThread = new HandlerThread("solution!");
        handlerThread.start();

        // given
        GpsStatusManager subject = new GpsStatusManager(context, statusList::add, new Handler(handlerThread.getLooper()));
        subject.onRecordingDistanceChanged(Distance.of(10));
        subject.onMinSamplingIntervalChanged(GpsStatusManager.SIGNAL_LOST_THRESHOLD.multipliedBy(-1).plus(Duration.ofMillis(10)));

        // when / then
        subject.start();
        Thread.sleep(100);
        assertEquals(List.of(GPS_ENABLED), statusList);

        subject.onNewTrackPoint(Position.of(ok, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX), statusList);

        Thread.sleep(100);
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX, GPS_SIGNAL_LOST), statusList);

        subject.onNewTrackPoint(Position.of(badFix, Instant.now()));
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX, GPS_SIGNAL_LOST, GPS_SIGNAL_BAD), statusList);

        Thread.sleep(100);
        assertEquals(List.of(GPS_ENABLED, GPS_SIGNAL_FIX, GPS_SIGNAL_LOST, GPS_SIGNAL_BAD, GPS_SIGNAL_LOST), statusList);
    }
}