import {EntityListView} from '@avocado/entity';
import {Container, Sprite} from '@avocado/graphics';
import {Vector} from '@avocado/math';
import {BodyView} from '@avocado/physics';

import {Layer} from './layer';
import {TilesRenderer} from './tiles-renderer';

export class LayerView extends Container {

  constructor(layer, renderer) {
    super();
    this.entityListView = new EntityListView(layer.entityList);
    this.layer = layer;
    this.layerContainer = new Container();
    this.renderer = renderer;
    this.tileGeometryContainer = new Container();
    this.tileGeometryViews = [];
    // Handle entity add/remove.
    layer.on('tileDataChanged', this.onLayerTileDataChanged, this);
    layer.on('tileGeometryChanged', this.onLayerTileGeometryChanged, this);
    layer.on('tilesetChanged', this.onLayerTilesetChanged, this);
    this.addChild(this.layerContainer);
    this.addChild(this.tileGeometryContainer);
    this.addChild(this.entityListView);
  }

  destroy() {
    super.destroy();
    layer.off('entityAdded', this.onLayerEntityAdded);
    layer.off('entityRemoved', this.onLayerEntityRemoved);
    layer.off('tileDataChanged', this.onLayerTileDataChanged);
    layer.off('tilesetChanged', this.onLayerTilesetChanged);
    this.destroyTileGeometryBodies();
  }

  destroyTileGeometryBodies() {
    for (const view of this.tileGeometryViews) {
      view.destroy();
    }
    this.tileGeometryViews = [];
  }

  onLayerTileDataChanged() {
    this.render();
  }

  onLayerTileGeometryChanged() {
    this.destroyTileGeometryBodies();
    for (const body of this.layer.tileGeometry) {
      const bodyView = new BodyView(body);
      this.tileGeometryViews.push(bodyView);
      this.tileGeometryContainer.addChild(bodyView);
    }
  }

  onLayerTilesetChanged() {
    this.render();
  }

  render() {
    this.layerContainer.removeAllChildren();
    if (!this.renderer) {
      return;
    }
    if (!this.layer.tileset) {
      return;
    }
    if (Vector.isZero(this.layer.tiles.size)) {
      return;
    }
    const tilesRenderer = new TilesRenderer(this.layer.tiles, this.layer.tileset);
    const chunk = tilesRenderer.renderChunk(this.renderer);
    const tilesSprite = new Sprite(chunk);
    this.layerContainer.addChild(tilesSprite);
  }

}