import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { Layer, Grids } from './export';

export default class Scene extends Component {

  shouldComponentUpdate(nextProps, nextState) {
    return this.props.scene.hashCode() !== nextProps.scene.hashCode();
  }

  render() {
    let {scene, catalog} = this.props;
    let {height, layers} = scene;
    let selectedLayer = layers.get(scene.selectedLayer);

    return (
      <g>
        <Grids scene={scene}/>

        <g style={{pointerEvents: 'none'}}>
          {
            layers
            .entrySeq()
            .filter(([layerID, layer]) => layerID !== scene.selectedLayer && layer.visible)
            .map(([layerID, layer]) => <Layer key={layerID} layer={layer} scene={scene} catalog={catalog}/>)
          }
        </g>

        <Layer key={selectedLayer.id} layer={selectedLayer} scene={scene} catalog={catalog}/>
      </g>
    );
  }
}


Scene.propTypes = {
  scene: PropTypes.object.isRequired,
  catalog: PropTypes.object.isRequired
};