import {quadtree} from 'd3-quadtree';

import * as Rectangle from './rectangle';

export class QuadTree {

  constructor() {
    this.quadTree = quadtree();
  }

  add(datum) {
    this.quadTree.add(datum);
  }

  clear() {
    const data = this.quadTree.data();
    for (let i = 0; i < data.length; i++) {
      const datum = data[i];
      this.quadTree.remove(datum);
    }
  }

  remove(datum) {
    this.quadTree.remove(datum);
  }

  search(queryRectangle) {
    const nodes = [];
    this.quadTree.visit((node, x, y, x0, y0) => {
      const w = x0 - x;
      const h = y0 - y;
      if (!Rectangle.intersects(queryRectangle, [x, y, w, h])) {
        return true;
      }
      if (4 === node.length) {
        return;
      }
      do {
        if (Rectangle.intersects(queryRectangle, node.data)) {
          nodes.push(node);
        }
      } while (node = node.next);
    });
    return nodes;
  }

}