package com.mapbox.mapboxsdk.maps;

import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.UiThread;

import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.constants.MapboxConstants;
import com.mapbox.mapboxsdk.constants.MyBearingTracking;
import com.mapbox.mapboxsdk.constants.MyLocationTracking;
import com.mapbox.mapboxsdk.maps.widgets.MyLocationView;
import com.mapbox.services.android.telemetry.location.LocationEngine;
import com.mapbox.services.android.telemetry.location.LocationEngineListener;
import com.mapbox.services.android.telemetry.permissions.PermissionsManager;

import timber.log.Timber;

/**
 * Settings for the user location and bearing tracking of a MapboxMap.
 *
 * @deprecated use location layer plugin from
 * https://github.com/mapbox/mapbox-plugins-android/tree/master/plugins/locationlayer instead.
 */
@Deprecated
public final class TrackingSettings {

  private final MyLocationView myLocationView;
  private final UiSettings uiSettings;
  private final FocalPointChangeListener focalPointChangedListener;
  private final CameraZoomInvalidator zoomInvalidator;
  private LocationEngine locationSource;
  private LocationEngineListener myLocationListener;
  private boolean locationChangeAnimationEnabled = true;
  private boolean isCustomLocationSource;

  private boolean myLocationEnabled;
  private boolean dismissLocationTrackingOnGesture = true;
  private boolean dismissBearingTrackingOnGesture = true;

  private MapboxMap.OnMyLocationTrackingModeChangeListener onMyLocationTrackingModeChangeListener;
  private MapboxMap.OnMyBearingTrackingModeChangeListener onMyBearingTrackingModeChangeListener;

  TrackingSettings(@NonNull MyLocationView myLocationView, UiSettings uiSettings,
                   FocalPointChangeListener focalPointChangedListener, CameraZoomInvalidator zoomInvalidator) {
    this.myLocationView = myLocationView;
    this.focalPointChangedListener = focalPointChangedListener;
    this.uiSettings = uiSettings;
    this.zoomInvalidator = zoomInvalidator;
  }

  void initialise(MapboxMapOptions options) {
    locationSource = Mapbox.getLocationSource();
    setMyLocationEnabled(options.getLocationEnabled());
  }

  void onSaveInstanceState(Bundle outState) {
    outState.putInt(MapboxConstants.STATE_MY_LOCATION_TRACKING_MODE, getMyLocationTrackingMode());
    outState.putInt(MapboxConstants.STATE_MY_BEARING_TRACKING_MODE, getMyBearingTrackingMode());
    outState.putBoolean(MapboxConstants.STATE_MY_LOCATION_TRACKING_DISMISS, isDismissLocationTrackingOnGesture());
    outState.putBoolean(MapboxConstants.STATE_MY_BEARING_TRACKING_DISMISS, isDismissBearingTrackingOnGesture());
    outState.putBoolean(MapboxConstants.STATE_MY_LOCATION_ENABLED, isMyLocationEnabled());
    outState.putBoolean(MapboxConstants.STATE_LOCATION_CHANGE_ANIMATION_ENABLED, isLocationChangeAnimationEnabled());
    outState.putBoolean(MapboxConstants.STATE_USING_CUSTOM_LOCATION_SOURCE, isCustomLocationSource());
  }

  void onRestoreInstanceState(Bundle savedInstanceState) {
    try {
      setMyLocationEnabled(
        savedInstanceState.getBoolean(MapboxConstants.STATE_MY_LOCATION_ENABLED),
        savedInstanceState.getBoolean(MapboxConstants.STATE_USING_CUSTOM_LOCATION_SOURCE)
      );
    } catch (SecurityException ignore) {
      // User did not accept location permissions
    }
    // noinspection ResourceType
    setMyLocationTrackingMode(savedInstanceState.getInt(
      MapboxConstants.STATE_MY_LOCATION_TRACKING_MODE, MyLocationTracking.TRACKING_NONE));
    // noinspection ResourceType
    setMyBearingTrackingMode(savedInstanceState.getInt(
      MapboxConstants.STATE_MY_BEARING_TRACKING_MODE, MyBearingTracking.NONE));
    setDismissLocationTrackingOnGesture(savedInstanceState.getBoolean(
      MapboxConstants.STATE_MY_LOCATION_TRACKING_DISMISS, true));
    setDismissBearingTrackingOnGesture(savedInstanceState.getBoolean(
      MapboxConstants.STATE_MY_BEARING_TRACKING_DISMISS, true));
    setLocationChangeAnimationEnabled(savedInstanceState.getBoolean(
      MapboxConstants.STATE_LOCATION_CHANGE_ANIMATION_ENABLED, true));
  }

  /**
   * <p>
   * Set the current my location tracking mode.
   * </p>
   * <p>
   * Will enable my location if not active.
   * </p>
   * See {@link MyLocationTracking} for different values.
   *
   * @param myLocationTrackingMode The location tracking mode to be used.
   * @throws SecurityException if no suitable permission is present
   * @see MyLocationTracking
   */
  @UiThread
  public void setMyLocationTrackingMode(@MyLocationTracking.Mode int myLocationTrackingMode) {
    myLocationView.setLocationChangeAnimationEnabled(isLocationChangeAnimationEnabled());
    myLocationView.setMyLocationTrackingMode(myLocationTrackingMode);

    if (myLocationTrackingMode == MyLocationTracking.TRACKING_FOLLOW) {
      zoomInvalidator.zoomTo(2.0);
      focalPointChangedListener.onFocalPointChanged(myLocationView.getCenter());
    } else {
      focalPointChangedListener.onFocalPointChanged(null);
    }

    if (onMyLocationTrackingModeChangeListener != null) {
      onMyLocationTrackingModeChangeListener.onMyLocationTrackingModeChange(myLocationTrackingMode);
    }
  }

  /**
   * Returns the current user location tracking mode.
   *
   * @return The current user location tracking mode.
   * One of the values from {@link MyLocationTracking.Mode}.
   * @see MyLocationTracking.Mode
   */
  @UiThread
  @MyLocationTracking.Mode
  public int getMyLocationTrackingMode() {
    return myLocationView.getMyLocationTrackingMode();
  }

  /**
   * <p>
   * Set the current my bearing tracking mode.
   * </p>
   * Shows the direction the user is heading.
   * <p>
   * When location tracking is disabled the direction of {@link MyLocationView} is rotated. When
   * location tracking is enabled the {@link MapView} is rotated based on the bearing value.
   * </p>
   * See {@link MyBearingTracking} for different values.
   *
   * @param myBearingTrackingMode The bearing tracking mode to be used.
   * @throws SecurityException if no suitable permission is present
   * @see MyBearingTracking
   */
  @UiThread
  public void setMyBearingTrackingMode(@MyBearingTracking.Mode int myBearingTrackingMode) {
    myLocationView.setMyBearingTrackingMode(myBearingTrackingMode);
    if (onMyBearingTrackingModeChangeListener != null) {
      onMyBearingTrackingModeChangeListener.onMyBearingTrackingModeChange(myBearingTrackingMode);
    }
  }

  /**
   * Returns the current user bearing tracking mode.
   * See {@link MyBearingTracking} for possible return values.
   *
   * @return the current user bearing tracking mode.
   * @see MyBearingTracking
   */
  @UiThread
  @MyBearingTracking.Mode
  public int getMyBearingTrackingMode() {
    return myLocationView.getMyBearingTrackingMode();
  }

  /**
   * Returns if all tracking modes will be dismissed when a gesture occurs.
   *
   * @return True to indicate that location and bearing tracking will be dismissed.
   */
  public boolean isAllDismissTrackingOnGesture() {
    return dismissLocationTrackingOnGesture && dismissBearingTrackingOnGesture;
  }

  /**
   * Set the dismissal of the tracking modes if a gesture occurs.
   *
   * @param dismissTrackingOnGesture True to dismiss all the tracking modes.
   */
  public void setDismissAllTrackingOnGesture(boolean dismissTrackingOnGesture) {
    dismissLocationTrackingOnGesture = dismissTrackingOnGesture;
    dismissBearingTrackingOnGesture = dismissTrackingOnGesture;
  }

  /**
   * Set the dismissal of the tracking modes if a gesture occurs.
   *
   * @param dismissLocationTrackingOnGesture True to dismiss the location tracking mode.
   */
  public void setDismissLocationTrackingOnGesture(boolean dismissLocationTrackingOnGesture) {
    this.dismissLocationTrackingOnGesture = dismissLocationTrackingOnGesture;
  }

  /**
   * Returns if the location tracking will be disabled when a gesture occurs
   *
   * @return True if location tracking will be disabled.
   */
  public boolean isDismissLocationTrackingOnGesture() {
    return dismissLocationTrackingOnGesture;
  }

  /**
   * Set the dismissal of the bearing tracking modes if a gesture occurs.
   *
   * @param dismissBearingTrackingOnGesture True to dimsiss the bearinf tracking mode
   */
  public void setDismissBearingTrackingOnGesture(boolean dismissBearingTrackingOnGesture) {
    this.dismissBearingTrackingOnGesture = dismissBearingTrackingOnGesture;
  }

  /**
   * Returns if bearing will disabled when a gesture occurs
   *
   * @return True if bearing tracking will be disabled
   */
  public boolean isDismissBearingTrackingOnGesture() {
    return dismissBearingTrackingOnGesture;
  }

  /**
   * Returns if location tracking is disabled
   *
   * @return True if location tracking is disabled.
   */
  public boolean isLocationTrackingDisabled() {
    return myLocationView.getMyLocationTrackingMode() == MyLocationTracking.TRACKING_NONE;
  }

  /**
   * Returns if bearing tracking disabled
   *
   * @return True if bearing tracking is disabled.
   */
  public boolean isBearingTrackingDisabled() {
    return myLocationView.getMyBearingTrackingMode() == MyBearingTracking.NONE;
  }

  /**
   * Returns if rotate gesture are currently enabled.
   *
   * @return True if rotate gestures are currently enabled.
   */
  public boolean isRotateGestureCurrentlyEnabled() {
    // rotate gestures are recognised if:
    //    The user settings are enabled AND;
    //    EITHER bearing tracking is dismissed on gesture OR there is no bearing tracking
    return uiSettings.isRotateGesturesEnabled()
      && (dismissBearingTrackingOnGesture
      || myLocationView.getMyBearingTrackingMode() == MyBearingTracking.NONE
      || myLocationView.getMyLocationTrackingMode() == MyLocationTracking.TRACKING_NONE);
  }

  /**
   * Returns if scroll gesture are currently enabled.
   *
   * @return True if scroll gestures are currently enabled.
   */
  public boolean isScrollGestureCurrentlyEnabled() {
    return uiSettings.isScrollGesturesEnabled()
      && (dismissLocationTrackingOnGesture
      || myLocationView.getMyLocationTrackingMode() == MyLocationTracking.TRACKING_NONE);
  }

  /**
   * Returns whether location change animation is applied for {@link MyLocationTracking#TRACKING_FOLLOW}.
   *
   * @return True if animation is applied, false otherwise.
   */
  public boolean isLocationChangeAnimationEnabled() {
    return locationChangeAnimationEnabled;
  }

  /**
   * Set whether location change animation should be applied for {@link MyLocationTracking#TRACKING_FOLLOW}.
   *
   * @param locationChangeAnimationEnabled True if animation should be applied, false otherwise.
   */
  public void setLocationChangeAnimationEnabled(boolean locationChangeAnimationEnabled) {
    this.locationChangeAnimationEnabled = locationChangeAnimationEnabled;

    myLocationView.setLocationChangeAnimationEnabled(locationChangeAnimationEnabled);
  }

  /**
   * Reset the tracking modes as necessary. Location tracking is reset if the map center is changed and not from
   * location, bearing tracking if there is a rotation.
   *
   * @param translate      true if translation
   * @param rotate         true if rotation
   * @param isFromLocation true if from location
   */
  void resetTrackingModesIfRequired(boolean translate, boolean rotate, boolean isFromLocation) {
    // if tracking is on, and we should dismiss tracking with gestures, and this is a scroll action, turn tracking off
    if (translate && !isLocationTrackingDisabled() && isDismissLocationTrackingOnGesture() && !isFromLocation) {
      setMyLocationTrackingMode(MyLocationTracking.TRACKING_NONE);
    }

    // reset bearing tracking only on rotate
    if (rotate && !isBearingTrackingDisabled() && isDismissBearingTrackingOnGesture()) {
      setMyBearingTrackingMode(MyBearingTracking.NONE);
    }
  }

  /**
   * Reset the tracking modes as necessary. Animated camera position changes can reset the underlying tracking modes.
   *
   * @param currentCameraPosition the current camera position
   * @param targetCameraPosition  the changed camera position
   * @param isFromLocation        true if from location
   */
  void resetTrackingModesIfRequired(CameraPosition currentCameraPosition, CameraPosition targetCameraPosition,
                                    boolean isFromLocation) {
    if (currentCameraPosition.target != null) {
      resetTrackingModesIfRequired(!currentCameraPosition.target.equals(targetCameraPosition.target), false,
        isFromLocation);
    }
  }

  Location getMyLocation() {
    return myLocationView.getLocation();
  }

  void setOnMyLocationChangeListener(@Nullable final MapboxMap.OnMyLocationChangeListener listener) {
    if (listener != null) {
      myLocationListener = new LocationEngineListener() {
        @Override
        public void onConnected() {
          // Nothing
        }

        @Override
        public void onLocationChanged(Location location) {
          if (listener != null) {
            listener.onMyLocationChange(location);
          }
        }
      };
      locationSource.addLocationEngineListener(myLocationListener);
    } else {
      locationSource.removeLocationEngineListener(myLocationListener);
      myLocationListener = null;
    }
  }

  public boolean isCustomLocationSource() {
    return isCustomLocationSource;
  }

  void setOnMyLocationTrackingModeChangeListener(MapboxMap.OnMyLocationTrackingModeChangeListener listener) {
    this.onMyLocationTrackingModeChangeListener = listener;
  }

  void setOnMyBearingTrackingModeChangeListener(MapboxMap.OnMyBearingTrackingModeChangeListener listener) {
    this.onMyBearingTrackingModeChangeListener = listener;
  }

  MyLocationView getMyLocationView() {
    return myLocationView;
  }


  boolean isMyLocationEnabled() {
    return myLocationEnabled;
  }

  void setMyLocationEnabled(boolean locationEnabled) {
    setMyLocationEnabled(locationEnabled, isCustomLocationSource());
  }

  private void setMyLocationEnabled(boolean locationEnabled, boolean isCustomLocationSource) {
    if (!PermissionsManager.areLocationPermissionsGranted(myLocationView.getContext())) {
      Timber.e("Could not activate user location tracking: "
        + "user did not accept the permission or permissions were not requested.");
      return;
    }
    myLocationEnabled = locationEnabled;
    this.isCustomLocationSource = isCustomLocationSource;
    myLocationView.setEnabled(locationEnabled, isCustomLocationSource);
  }

  void setLocationSource(LocationEngine locationSource) {
    if (this.locationSource != null && this.locationSource.equals(locationSource)) {
      // this source is already active
      return;
    }

    this.isCustomLocationSource = locationSource != null;
    if (locationSource == null) {
      locationSource = Mapbox.getLocationSource();
    }
    this.locationSource = locationSource;
    myLocationView.setLocationSource(locationSource);
  }

  void update() {
    if (!myLocationView.isEnabled()) {
      return;
    }
    myLocationView.update();
  }

  void onStart() {
    myLocationView.onStart();
  }

  void onStop() {
    myLocationView.onStop();
  }

  interface CameraZoomInvalidator {
    void zoomTo(double zoomLevel);
  }
}