import {Composite, Bodies, Body as MatterBody} from 'matter-js';

import {Vector} from '@avocado/math';
import {ShapeList, PolygonShape, RectangleShape} from '@avocado/physics';

import {AbstractBody} from '../abstract/body';
import { Rectangle } from '../../math';

export class Body extends AbstractBody {

  constructor(shape) {
    super(shape);
    this.matterBody = this.constructor.bodyFromShape(shape);
  }

  applyForce(force) {
    MatterBody.applyForce(
      this.matterBody,
      this.matterBody.position,
      {
        x: force[0],
        y: force[1],
      }
    );
  }

  applyImpulse(impulse, elapsed) {
    impulse = Vector.scale(impulse, elapsed);
    MatterBody.translate(this.matterBody, {
      x: impulse[0],
      y: impulse[1],
    });
  }

  static bodyFromShape(shape) {
    if (shape instanceof RectangleShape) {
      return Bodies.rectangle(
        shape.x,
        shape.y,
        shape.width,
        shape.height,
      );
    }
    else if (shape instanceof PolygonShape) {
      const vectors = [];
      for (const vertice of shape) {
        vectors.push({
          x: vertice[0],
          y: vertice[1],
        });
      }
      return Bodies.fromVertices(
        shape.x,
        shape.y,
        vectors,
      );
    }
  }

  get position() {
    return [
      this.matterBody.position.x,
      this.matterBody.position.y,
    ];
  }

  set position(position) {
    MatterBody.setPosition(this.matterBody, {
      x: position[0],
      y: position[1],
    });
  }

}