package com.mapbox.mapboxsdk.annotations;

import android.support.annotation.FloatRange;
import android.support.annotation.Nullable;

import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.constants.MapboxConstants;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapboxMap;

/**
 * MarkerView is an annotation that shows a {@link android.view.View} at a geographical location. The
 * default marker uses a provided icon. This icon can be customized using {@link IconFactory} to
 * generate an {@link Icon} using a provided image. MarkerViews are added to the map by first giving
 * a {@link LatLng} and using {@link MapboxMap#addMarker(BaseMarkerViewOptions)}. The marker view icon
 * by default is anchored at the center bottom.
 * <p>
 * If many markers are needed to be displayed on the map at once we suggest using {@link Marker}
 * instead. This class uses {@link com.mapbox.mapboxsdk.maps.MapboxMap.MarkerViewAdapter} to adapt a
 * MarkerView model to an Android SDK {@link android.view.View} object.
 * </p>
 * <p>
 * MarkerViews are designed to be interactive. They receive click events by default, and are often
 * used with event listeners to bring up info windows. An {@link InfoWindow} is displayed by default
 * when either a title or snippet is provided.
 * </p>
 */
public class MarkerView extends Marker {

  private MarkerViewManager markerViewManager;

  private float width;
  private float height;

  private float anchorU;
  private float anchorV;

  private float offsetX = MapboxConstants.UNMEASURED;
  private float offsetY = MapboxConstants.UNMEASURED;

  private float infoWindowAnchorU;
  private float infoWindowAnchorV;

  private boolean flat;
  private boolean visible = true;

  private float tiltValue;
  private float rotation;
  private float alpha = 1;

  private Icon markerViewIcon;

  private boolean selected;


  /**
   * Publicly hidden default constructor
   */
  MarkerView() {
  }

  /**
   * Creates a instance of MarkerView using the builder of MarkerView
   *
   * @param baseMarkerViewOptions the builder used to construct the MarkerView
   */
  public MarkerView(BaseMarkerViewOptions baseMarkerViewOptions) {
    super(baseMarkerViewOptions);
    this.alpha = baseMarkerViewOptions.getAlpha();
    this.anchorU = baseMarkerViewOptions.getAnchorU();
    this.anchorV = baseMarkerViewOptions.getAnchorV();
    this.infoWindowAnchorU = baseMarkerViewOptions.getInfoWindowAnchorU();
    this.infoWindowAnchorV = baseMarkerViewOptions.getInfoWindowAnchorV();
    this.flat = baseMarkerViewOptions.isFlat();
    this.rotation = baseMarkerViewOptions.getRotation();
    this.selected = baseMarkerViewOptions.selected;
  }

  float getWidth() {
    return width;
  }

  void setWidth(float width) {
    this.width = width;
  }

  float getHeight() {
    return height;
  }

  void setHeight(float height) {
    this.height = height;
  }

  /**
   * Specifies the anchor being set on a particular point of the MarkerView.
   * <p>
   * The anchor point is specified in the continuous space [0.0, 1.0] x [0.0, 1.0], where (0, 0)
   * is the top-left corner of the image, and (1, 1) is the bottom-right corner.
   * </p>
   *
   * @param u u-coordinate of the anchor, as a ratio of the image width (in the range [0, 1]).
   * @param v v-coordinate of the anchor, as a ratio of the image height (in the range [0, 1]).
   */
  public void setAnchor(@FloatRange(from = 0.0, to = 1.0) float u, @FloatRange(from = 0.0, to = 1.0) float v) {
    this.anchorU = u;
    this.anchorV = v;
    setOffset(-1, -1);
  }

  /**
   * Get the horizontal distance, normalized to [0, 1], of the anchor from the left edge.
   *
   * @return The u-value of the anchor.
   */
  public float getAnchorU() {
    return anchorU;
  }

  /**
   * Get the vertical distance, normalized to [0, 1], of the anchor from the top edge.
   *
   * @return the v-value of the anchor.
   */
  public float getAnchorV() {
    return anchorV;
  }

  /**
   * Internal method to set the calculated offset.
   * <p>
   * These are calculated based on the View bounds and the provided anchor.
   * </p>
   *
   * @param x the x-value of the offset.
   * @param y the y-value of the offset.
   */
  void setOffset(float x, float y) {
    offsetX = x;
    offsetY = y;
  }

  /**
   * Internal method to get the horizontal calculated offset.
   *
   * @return the calculated horizontal offset.
   */
  float getOffsetX() {
    return offsetX;
  }

  /**
   * Internal method to get the vertical calculated offset.
   *
   * @return the calculated vertical offset.
   */
  float getOffsetY() {
    return offsetY;
  }

  /**
   * Specifies the anchor point of the info window on the View of the MarkerView.
   * <p>
   * The anchor point is specified in the continuous space [0.0, 1.0] x [0.0, 1.0], where (0, 0)
   * is the top-left corner of the image, and (1, 1) is the bottom-right corner.
   * </p>
   * <p>
   * The default is the top middle of the View.
   * </p>
   *
   * @param u u-coordinate of the info window anchor, as a ratio of the image width (in the range [0, 1]).
   * @param v v-coordinate of the info window anchor, as a ratio of the image height (in the range [0, 1]).
   * @see #setAnchor(float, float) for more details.
   */
  public void setInfoWindowAnchor(@FloatRange(from = 0.0, to = 1.0) float u,
                                  @FloatRange(from = 0.0, to = 1.0) float v) {
    this.infoWindowAnchorU = u;
    this.infoWindowAnchorV = v;
  }

  /**
   * Get the horizontal distance, normalized to [0, 1], of the info window anchor from the left edge.
   *
   * @return the u value of the InfoWindow anchor.
   */
  public float getInfoWindowAnchorU() {
    return infoWindowAnchorU;
  }

  /**
   * Get the vertical distance, normalized to [0, 1], of the info window anchor from the top edge.
   *
   * @return the v value of the InfoWindow anchor.
   */
  public float getInfoWindowAnchorV() {
    return infoWindowAnchorV;
  }

  /**
   * Get the flat state of a MarkerView.
   *
   * @return true if the MarkerView is flat; false if the MarkerView is billboard.
   */
  public boolean isFlat() {
    return flat;
  }

  /**
   * Sets whether this MarkerView should be flat against the map (true) or a billboard facing the
   * camera (false).
   *
   * @param flat the flat state of the MarkerView.
   */
  public void setFlat(boolean flat) {
    this.flat = flat;
  }

  /**
   * Internal method to get the current tilted value of a MarkerView.
   *
   * @return the tilted value.
   */
  float getTilt() {
    return tiltValue;
  }

  /**
   * Internal method to set the current titled value of a MarkerView.
   *
   * @param tiltValue the tilted value to set.
   */
  void setTilt(@FloatRange(from = 0.0, to = MapboxConstants.MAXIMUM_TILT) float tiltValue) {
    this.tiltValue = tiltValue;
  }

  /**
   * Set the visible state of a MarkerView.
   *
   * @param visible true will make the MarkerView visible, false will hide the MarkerView.
   */
  public void setVisible(boolean visible) {
    this.visible = visible;
    if (markerViewManager != null) {
      markerViewManager.animateVisible(this, visible);
    }
  }

  /**
   * Returns the visible state of the MarkerView.
   *
   * @return the visible state.
   */
  public boolean isVisible() {
    return visible;
  }

  /**
   * Set the rotation value of the MarkerView in degrees.
   * <p>
   * Input will be limited to 0 - 360 degrees.
   * </p>
   * <p>
   * This will result in animating the rotation of the MarkerView using an rotation animator
   * from current value to the provided parameter value.
   * </p>
   *
   * @param rotation the rotation value to animate to.
   */
  public void setRotation(float rotation) {
    this.rotation = rotation;
    if (markerViewManager != null) {
      markerViewManager.setRotation(this, rotation);
    }
  }

  /**
   * Get the rotation value of the MarkerView.
   *
   * @return the rotation value.
   */
  public float getRotation() {
    return rotation;
  }

  /**
   * Get the alpha value of the MarkerView.
   *
   * @return the alpha value.
   */
  public float getAlpha() {
    return alpha;
  }

  /**
   * Set the alpha value of the MarkerView.
   * <p>
   * This will result in animating the alpha of the MarkerView using an alpha animator
   * from current value to the provided parameter value.
   * </p>
   *
   * @param alpha the alpha value to animate to.
   */
  public void setAlpha(@FloatRange(from = 0.0, to = 255.0) float alpha) {
    this.alpha = alpha;
    if (markerViewManager != null) {
      markerViewManager.animateAlpha(this, alpha);
    }
  }

  /**
   * Set the icon of the MarkerView.
   *
   * @param icon the {@link Icon} to be used as Marker image.
   */
  @Override
  public void setIcon(@Nullable Icon icon) {
    if (icon != null) {
      markerViewIcon = IconFactory.recreate(IconFactory.ICON_MARKERVIEW_ID, icon.getBitmap());
    }
    Icon transparentIcon = IconFactory.recreate(IconFactory.ICON_MARKERVIEW_ID,
      IconFactory.ICON_MARKERVIEW_BITMAP);
    if (markerViewManager != null) {
      markerViewManager.updateIcon(this);
    }
    super.setIcon(transparentIcon);
  }

  /**
   * Sets the location of the marker.
   *
   * @param position A {@link LatLng} defining the marker position.
   */
  @Override
  public void setPosition(LatLng position) {
    super.setPosition(position);
    if (markerViewManager != null) {
      markerViewManager.setWaitingForRenderInvoke(true);
      markerViewManager.update();
    }
  }

  /**
   * Determine if the {@link MarkerView} is selected or not.
   *
   * @return True if the MarkerView's selected, else false.
   */
  public boolean isSelected() {
    return selected;
  }

  /**
   * For internal use only, use {@link MapboxMap#selectMarker(Marker)} instead.
   */
  void setSelected(boolean selected) {
    this.selected = selected;
  }

  /**
   * Get the icon of the MarkerView.
   *
   * @return the icon use as Marker image.
   */
  @Override
  public Icon getIcon() {
    if (markerViewIcon == null) {
      setIcon(IconFactory.getInstance(Mapbox.getApplicationContext()).defaultMarkerView());
    }
    return markerViewIcon;
  }

  /**
   * Set the MapboxMap associated tot the MapView containing the MarkerView.
   * <p>
   * This method is used to instantiate the MarkerView and provide an instance of
   * {@link com.mapbox.mapboxsdk.maps.MapboxMap.MarkerViewAdapter}
   * </p>
   * <p>
   * This method is used to notify that a MarkerView is no longer active by setting a null value.
   * </p>
   *
   * @param mapboxMap the MapboxMap instances.
   */
  @Override
  public void setMapboxMap(MapboxMap mapboxMap) {
    super.setMapboxMap(mapboxMap);
    if (mapboxMap != null) {
      if (isFlat()) {
        // initial tilt value if MapboxMap is started with a tilt attribute
        tiltValue = (float) mapboxMap.getCameraPosition().tilt;
      }

      markerViewManager = mapboxMap.getMarkerViewManager();
    }
  }

  /**
   * Invalidates the MarkerView resulting in remeasuring the View.
   */
  void invalidate() {
    width = height = 0;
    offsetX = offsetY = MapboxConstants.UNMEASURED;
    markerViewManager.invalidateViewMarkersInVisibleRegion();
  }

  /**
   * Get the String representation of a MarkerView.
   *
   * @return the String representation.
   */
  @Override
  public String toString() {
    return "MarkerView [position[" + getPosition() + "]]";
  }
}