package com.mapbox.mapboxsdk.maps;

import android.graphics.PointF;
import android.graphics.RectF;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.util.LongSparseArray;

import com.mapbox.mapboxsdk.annotations.Annotation;
import com.mapbox.mapboxsdk.annotations.BaseMarkerOptions;
import com.mapbox.mapboxsdk.annotations.BaseMarkerViewOptions;
import com.mapbox.mapboxsdk.annotations.Icon;
import com.mapbox.mapboxsdk.annotations.Marker;
import com.mapbox.mapboxsdk.annotations.MarkerView;
import com.mapbox.mapboxsdk.annotations.MarkerViewManager;
import com.mapbox.mapboxsdk.annotations.Polygon;
import com.mapbox.mapboxsdk.annotations.PolygonOptions;
import com.mapbox.mapboxsdk.annotations.Polyline;
import com.mapbox.mapboxsdk.annotations.PolylineOptions;

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

/**
 * Responsible for managing and tracking state of Annotations linked to Map. All events related to
 * annotations that occur on {@link MapboxMap} are forwarded to this class.
 * <p>
 * Responsible for referencing {@link InfoWindowManager} and {@link MarkerViewManager}.
 * </p>
 * <p>
 * Exposes convenience methods to add/remove/update all subtypes of annotations found in
 * com.mapbox.mapboxsdk.annotations.
 * </p>
 */
class AnnotationManager {

  private final NativeMapView nativeMapView;
  private final MapView mapView;
  private final IconManager iconManager;
  private final InfoWindowManager infoWindowManager = new InfoWindowManager();
  private final MarkerViewManager markerViewManager;
  private final LongSparseArray<Annotation> annotations = new LongSparseArray<>();
  private final List<Marker> selectedMarkers = new ArrayList<>();

  private MapboxMap mapboxMap;
  private MapboxMap.OnMarkerClickListener onMarkerClickListener;

  AnnotationManager(NativeMapView view, MapView mapView, MarkerViewManager markerViewManager) {
    this.nativeMapView = view;
    this.mapView = mapView;
    this.iconManager = new IconManager(nativeMapView);
    this.markerViewManager = markerViewManager;
    if (view != null) {
      // null checking needed for unit tests
      nativeMapView.addOnMapChangedListener(markerViewManager);
    }
  }

  // TODO refactor MapboxMap out for Projection and Transform
  // Requires removing MapboxMap from Annotations by using Peer model from #6912
  AnnotationManager bind(MapboxMap mapboxMap) {
    this.mapboxMap = mapboxMap;
    this.markerViewManager.bind(mapboxMap);
    return this;
  }

  void update() {
    markerViewManager.update();
    infoWindowManager.update();
  }

  //
  // Annotations
  //

  Annotation getAnnotation(long id) {
    return annotations.get(id);
  }

  List<Annotation> getAnnotations() {
    List<Annotation> annotations = new ArrayList<>();
    for (int i = 0; i < this.annotations.size(); i++) {
      annotations.add(this.annotations.get(this.annotations.keyAt(i)));
    }
    return annotations;
  }

  void removeAnnotation(@NonNull Annotation annotation) {
    if (annotation instanceof Marker) {
      Marker marker = (Marker) annotation;
      marker.hideInfoWindow();
      if (marker instanceof MarkerView) {
        markerViewManager.removeMarkerView((MarkerView) marker);
      }
    }
    long id = annotation.getId();
    if (nativeMapView != null) {
      nativeMapView.removeAnnotation(id);
    }
    annotations.remove(id);
  }

  void removeAnnotation(long id) {
    if (nativeMapView != null) {
      nativeMapView.removeAnnotation(id);
    }
    annotations.remove(id);
  }

  void removeAnnotations(@NonNull List<? extends Annotation> annotationList) {
    int count = annotationList.size();
    long[] ids = new long[count];
    for (int i = 0; i < count; i++) {
      Annotation annotation = annotationList.get(i);
      if (annotation instanceof Marker) {
        Marker marker = (Marker) annotation;
        marker.hideInfoWindow();
        if (marker instanceof MarkerView) {
          markerViewManager.removeMarkerView((MarkerView) marker);
        }
      }
      ids[i] = annotationList.get(i).getId();
    }

    if (nativeMapView != null) {
      nativeMapView.removeAnnotations(ids);
    }

    for (long id : ids) {
      annotations.remove(id);
    }
  }

  void removeAnnotations() {
    Annotation annotation;
    int count = annotations.size();
    long[] ids = new long[count];
    for (int i = 0; i < count; i++) {
      ids[i] = annotations.keyAt(i);
      annotation = annotations.get(ids[i]);
      if (annotation instanceof Marker) {
        Marker marker = (Marker) annotation;
        marker.hideInfoWindow();
        if (marker instanceof MarkerView) {
          markerViewManager.removeMarkerView((MarkerView) marker);
        }
      }
    }

    if (nativeMapView != null) {
      nativeMapView.removeAnnotations(ids);
    }

    annotations.clear();
  }

  //
  // Markers
  //

  Marker addMarker(@NonNull BaseMarkerOptions markerOptions, @NonNull MapboxMap mapboxMap) {
    Marker marker = prepareMarker(markerOptions);
    long id = nativeMapView != null ? nativeMapView.addMarker(marker) : 0;
    marker.setMapboxMap(mapboxMap);
    marker.setId(id);
    annotations.put(id, marker);
    return marker;
  }

  List<Marker> addMarkers(@NonNull List<? extends BaseMarkerOptions> markerOptionsList, @NonNull MapboxMap mapboxMap) {
    int count = markerOptionsList.size();
    List<Marker> markers = new ArrayList<>(count);
    if (count > 0) {
      BaseMarkerOptions markerOptions;
      Marker marker;
      for (int i = 0; i < count; i++) {
        markerOptions = markerOptionsList.get(i);
        marker = prepareMarker(markerOptions);
        markers.add(marker);
      }

      if (markers.size() > 0) {
        long[] ids = null;
        if (nativeMapView != null) {
          ids = nativeMapView.addMarkers(markers);
        }

        long id = 0;
        Marker m;
        for (int i = 0; i < markers.size(); i++) {
          m = markers.get(i);
          m.setMapboxMap(mapboxMap);
          if (ids != null) {
            id = ids[i];
          } else {
            //unit test
            id++;
          }
          m.setId(id);
          annotations.put(id, m);
        }

      }
    }
    return markers;
  }

  private Marker prepareMarker(BaseMarkerOptions markerOptions) {
    Marker marker = markerOptions.getMarker();
    Icon icon = iconManager.loadIconForMarker(marker);
    marker.setTopOffsetPixels(iconManager.getTopOffsetPixelsForIcon(icon));
    return marker;
  }

  MarkerView addMarker(@NonNull BaseMarkerViewOptions markerOptions, @NonNull MapboxMap mapboxMap,
                       @Nullable MarkerViewManager.OnMarkerViewAddedListener onMarkerViewAddedListener) {
    final MarkerView marker = prepareViewMarker(markerOptions);

    // add marker to map
    marker.setMapboxMap(mapboxMap);
    long id = nativeMapView.addMarker(marker);
    marker.setId(id);
    annotations.put(id, marker);

    if (onMarkerViewAddedListener != null) {
      markerViewManager.addOnMarkerViewAddedListener(marker, onMarkerViewAddedListener);
    }
    markerViewManager.setEnabled(true);
    markerViewManager.setWaitingForRenderInvoke(true);
    return marker;
  }


  List<MarkerView> addMarkerViews(@NonNull List<? extends BaseMarkerViewOptions> markerViewOptions,
                                  @NonNull MapboxMap mapboxMap) {
    List<MarkerView> markers = new ArrayList<>();
    for (BaseMarkerViewOptions markerViewOption : markerViewOptions) {
      // if last marker
      if (markerViewOptions.indexOf(markerViewOption) == markerViewOptions.size() - 1) {
        // get notified when render occurs to invalidate and draw MarkerViews
        markerViewManager.setWaitingForRenderInvoke(true);
      }
      // add marker to map
      MarkerView marker = prepareViewMarker(markerViewOption);
      marker.setMapboxMap(mapboxMap);
      long id = nativeMapView.addMarker(marker);
      marker.setId(id);
      annotations.put(id, marker);
      markers.add(marker);
    }
    markerViewManager.setEnabled(true);
    markerViewManager.update();
    return markers;
  }

  private MarkerView prepareViewMarker(BaseMarkerViewOptions markerViewOptions) {
    MarkerView marker = markerViewOptions.getMarker();
    iconManager.loadIconForMarkerView(marker);
    return marker;
  }

  void updateMarker(@NonNull Marker updatedMarker, @NonNull MapboxMap mapboxMap) {
    if (updatedMarker == null) {
      return;
    }

    if (updatedMarker.getId() == -1) {
      return;
    }

    if (!(updatedMarker instanceof MarkerView)) {
      iconManager.ensureIconLoaded(updatedMarker, mapboxMap);
    }

    nativeMapView.updateMarker(updatedMarker);

    int index = annotations.indexOfKey(updatedMarker.getId());
    if (index > -1) {
      annotations.setValueAt(index, updatedMarker);
    }
  }

  List<Marker> getMarkers() {
    List<Marker> markers = new ArrayList<>();
    Annotation annotation;
    for (int i = 0; i < annotations.size(); i++) {
      annotation = annotations.get(annotations.keyAt(i));
      if (annotation instanceof Marker) {
        markers.add((Marker) annotation);
      }
    }
    return markers;
  }

  void setOnMarkerClickListener(@Nullable MapboxMap.OnMarkerClickListener listener) {
    onMarkerClickListener = listener;
  }

  void selectMarker(@NonNull Marker marker) {
    if (selectedMarkers.contains(marker)) {
      return;
    }

    // Need to deselect any currently selected annotation first
    if (!infoWindowManager.isAllowConcurrentMultipleOpenInfoWindows()) {
      deselectMarkers();
    }

    if (marker instanceof MarkerView) {
      markerViewManager.select((MarkerView) marker, false);
      markerViewManager.ensureInfoWindowOffset((MarkerView) marker);
    }

    if (infoWindowManager.isInfoWindowValidForMarker(marker) || infoWindowManager.getInfoWindowAdapter() != null) {
      infoWindowManager.add(marker.showInfoWindow(mapboxMap, mapView));
    }

    // only add to selected markers if user didn't handle the click event themselves #3176
    selectedMarkers.add(marker);
  }

  void deselectMarkers() {
    if (selectedMarkers.isEmpty()) {
      return;
    }

    for (Marker marker : selectedMarkers) {
      if (marker.isInfoWindowShown()) {
        marker.hideInfoWindow();
      }

      if (marker instanceof MarkerView) {
        markerViewManager.deselect((MarkerView) marker, false);
      }
    }

    // Removes all selected markers from the list
    selectedMarkers.clear();
  }

  void deselectMarker(@NonNull Marker marker) {
    if (!selectedMarkers.contains(marker)) {
      return;
    }

    if (marker.isInfoWindowShown()) {
      marker.hideInfoWindow();
    }

    if (marker instanceof MarkerView) {
      markerViewManager.deselect((MarkerView) marker, false);
    }

    selectedMarkers.remove(marker);
  }

  List<Marker> getSelectedMarkers() {
    return selectedMarkers;
  }

  List<Marker> getMarkersInRect(@NonNull RectF rectangle) {
    // convert Rectangle to be density depedent
    float pixelRatio = nativeMapView.getPixelRatio();
    RectF rect = new RectF(rectangle.left / pixelRatio,
      rectangle.top / pixelRatio,
      rectangle.right / pixelRatio,
      rectangle.bottom / pixelRatio);

    long[] ids = nativeMapView.queryPointAnnotations(rect);

    List<Long> idsList = new ArrayList<>(ids.length);
    for (long id : ids) {
      idsList.add(id);
    }

    List<Marker> annotations = new ArrayList<>(ids.length);
    List<Annotation> annotationList = getAnnotations();
    int count = annotationList.size();
    for (int i = 0; i < count; i++) {
      Annotation annotation = annotationList.get(i);
      if (annotation instanceof com.mapbox.mapboxsdk.annotations.Marker && idsList.contains(annotation.getId())) {
        annotations.add((com.mapbox.mapboxsdk.annotations.Marker) annotation);
      }
    }

    return new ArrayList<>(annotations);
  }

  List<MarkerView> getMarkerViewsInRect(@NonNull RectF rectangle) {
    float pixelRatio = nativeMapView.getPixelRatio();
    RectF rect = new RectF(rectangle.left / pixelRatio,
      rectangle.top / pixelRatio,
      rectangle.right / pixelRatio,
      rectangle.bottom / pixelRatio);

    long[] ids = nativeMapView.queryPointAnnotations(rect);

    List<Long> idsList = new ArrayList<>(ids.length);
    for (long id : ids) {
      idsList.add(id);
    }

    List<MarkerView> annotations = new ArrayList<>(ids.length);
    List<Annotation> annotationList = getAnnotations();
    int count = annotationList.size();
    for (int i = 0; i < count; i++) {
      Annotation annotation = annotationList.get(i);
      if (annotation instanceof MarkerView && idsList.contains(annotation.getId())) {
        annotations.add((MarkerView) annotation);
      }
    }

    return new ArrayList<>(annotations);
  }

  //
  // Polygons
  //

  Polygon addPolygon(@NonNull PolygonOptions polygonOptions, @NonNull MapboxMap mapboxMap) {
    Polygon polygon = polygonOptions.getPolygon();
    if (!polygon.getPoints().isEmpty()) {
      long id = nativeMapView != null ? nativeMapView.addPolygon(polygon) : 0;
      polygon.setId(id);
      polygon.setMapboxMap(mapboxMap);
      annotations.put(id, polygon);
    }
    return polygon;
  }

  List<Polygon> addPolygons(@NonNull List<PolygonOptions> polygonOptionsList, @NonNull MapboxMap mapboxMap) {
    int count = polygonOptionsList.size();

    Polygon polygon;
    List<Polygon> polygons = new ArrayList<>(count);
    if (count > 0) {
      for (PolygonOptions polygonOptions : polygonOptionsList) {
        polygon = polygonOptions.getPolygon();
        if (!polygon.getPoints().isEmpty()) {
          polygons.add(polygon);
        }
      }

      long[] ids = null;
      if (nativeMapView != null) {
        ids = nativeMapView.addPolygons(polygons);
      }

      long id = 0;
      for (int i = 0; i < polygons.size(); i++) {
        polygon = polygons.get(i);
        polygon.setMapboxMap(mapboxMap);
        if (ids != null) {
          id = ids[i];
        } else {
          // unit test
          id++;
        }
        polygon.setId(id);
        annotations.put(id, polygon);
      }
    }
    return polygons;
  }

  void updatePolygon(Polygon polygon) {
    if (polygon == null) {
      return;
    }

    if (polygon.getId() == -1) {
      return;
    }

    nativeMapView.updatePolygon(polygon);

    int index = annotations.indexOfKey(polygon.getId());
    if (index > -1) {
      annotations.setValueAt(index, polygon);
    }
  }

  List<Polygon> getPolygons() {
    List<Polygon> polygons = new ArrayList<>();
    Annotation annotation;
    for (int i = 0; i < annotations.size(); i++) {
      annotation = annotations.get(annotations.keyAt(i));
      if (annotation instanceof Polygon) {
        polygons.add((Polygon) annotation);
      }
    }
    return polygons;
  }

  //
  // Polylines
  //

  Polyline addPolyline(@NonNull PolylineOptions polylineOptions, @NonNull MapboxMap mapboxMap) {
    Polyline polyline = polylineOptions.getPolyline();
    if (!polyline.getPoints().isEmpty()) {
      long id = nativeMapView != null ? nativeMapView.addPolyline(polyline) : 0;
      polyline.setMapboxMap(mapboxMap);
      polyline.setId(id);
      annotations.put(id, polyline);
    }
    return polyline;
  }

  List<Polyline> addPolylines(@NonNull List<PolylineOptions> polylineOptionsList, @NonNull MapboxMap mapboxMap) {
    int count = polylineOptionsList.size();
    Polyline polyline;
    List<Polyline> polylines = new ArrayList<>(count);

    if (count > 0) {
      for (PolylineOptions options : polylineOptionsList) {
        polyline = options.getPolyline();
        if (!polyline.getPoints().isEmpty()) {
          polylines.add(polyline);
        }
      }

      long[] ids = null;
      if (nativeMapView != null) {
        ids = nativeMapView.addPolylines(polylines);
      }

      long id = 0;
      Polyline p;

      for (int i = 0; i < polylines.size(); i++) {
        p = polylines.get(i);
        p.setMapboxMap(mapboxMap);
        if (ids != null) {
          id = ids[i];
        } else {
          // unit test
          id++;
        }
        p.setId(id);
        annotations.put(id, p);
      }
    }
    return polylines;
  }

  void updatePolyline(Polyline polyline) {
    if (polyline == null) {
      return;
    }

    if (polyline.getId() == -1) {
      return;
    }

    nativeMapView.updatePolyline(polyline);

    int index = annotations.indexOfKey(polyline.getId());
    if (index > -1) {
      annotations.setValueAt(index, polyline);
    }
  }

  List<Polyline> getPolylines() {
    List<Polyline> polylines = new ArrayList<>();
    Annotation annotation;
    for (int i = 0; i < annotations.size(); i++) {
      annotation = annotations.get(annotations.keyAt(i));
      if (annotation instanceof Polyline) {
        polylines.add((Polyline) annotation);
      }
    }
    return polylines;
  }

  InfoWindowManager getInfoWindowManager() {
    return infoWindowManager;
  }

  MarkerViewManager getMarkerViewManager() {
    return markerViewManager;
  }

  void adjustTopOffsetPixels(MapboxMap mapboxMap) {
    int count = annotations.size();
    for (int i = 0; i < count; i++) {
      Annotation annotation = annotations.get(i);
      if (annotation instanceof Marker) {
        Marker marker = (Marker) annotation;
        marker.setTopOffsetPixels(
          iconManager.getTopOffsetPixelsForIcon(marker.getIcon()));
      }
    }

    for (Marker marker : selectedMarkers) {
      if (marker.isInfoWindowShown()) {
        marker.hideInfoWindow();
        marker.showInfoWindow(mapboxMap, mapView);
      }
    }
  }

  void reloadMarkers() {
    iconManager.reloadIcons();
    int count = annotations.size();
    for (int i = 0; i < count; i++) {
      Annotation annotation = annotations.get(i);
      if (annotation instanceof Marker) {
        Marker marker = (Marker) annotation;
        nativeMapView.removeAnnotation(annotation.getId());
        long newId = nativeMapView.addMarker(marker);
        marker.setId(newId);
      }
    }
  }

  //
  // Click event
  //

  boolean onTap(PointF tapPoint, float screenDensity) {
    float toleranceSides = 4 * screenDensity;
    float toleranceTopBottom = 10 * screenDensity;

    RectF tapRect = new RectF(tapPoint.x - iconManager.getAverageIconWidth() / 2 - toleranceSides,
      tapPoint.y - iconManager.getAverageIconHeight() / 2 - toleranceTopBottom,
      tapPoint.x + iconManager.getAverageIconWidth() / 2 + toleranceSides,
      tapPoint.y + iconManager.getAverageIconHeight() / 2 + toleranceTopBottom);

    List<Marker> nearbyMarkers = getMarkersInRect(tapRect);
    long newSelectedMarkerId = -1;

    if (nearbyMarkers != null && nearbyMarkers.size() > 0) {
      Collections.sort(nearbyMarkers);
      for (Marker nearbyMarker : nearbyMarkers) {
        boolean found = false;
        for (Marker selectedMarker : selectedMarkers) {
          if (selectedMarker.equals(nearbyMarker)) {
            found = true;
          }
        }
        if (!found) {
          newSelectedMarkerId = nearbyMarker.getId();
          break;
        }
      }
    }

    if (newSelectedMarkerId >= 0) {
      List<Annotation> annotations = getAnnotations();
      int count = annotations.size();
      for (int i = 0; i < count; i++) {
        Annotation annotation = annotations.get(i);
        if (annotation instanceof Marker) {
          if (annotation.getId() == newSelectedMarkerId) {
            Marker marker = (Marker) annotation;
            boolean handledDefaultClick = false;

            if (marker instanceof MarkerView) {
              handledDefaultClick = markerViewManager.onClickMarkerView((MarkerView) marker);
            } else {
              if (onMarkerClickListener != null) {
                // end developer has provided a custom click listener
                handledDefaultClick = onMarkerClickListener.onMarkerClick(marker);
              }
            }

            if (annotation instanceof MarkerView) {
              markerViewManager.onClickMarkerView((MarkerView) annotation);
            } else {
              if (!handledDefaultClick) {
                // only select marker if user didn't handle the click event themselves
                selectMarker(marker);
              }
            }

            return true;
          }
        }
      }
    }
    return false;
  }
}