import { utils } from "./utils.js";

/**
 * Poly Bezier
 * @param {[type]} curves [description]
 */
class PolyBezier {
  constructor(curves) {
    this.curves = [];
    this._3d = false;
    if (!!curves) {
      this.curves = curves;
      this._3d = this.curves[0]._3d;
    }
  }

  valueOf() {
    return this.toString();
  }

  toString() {
    return (
      "[" +
      this.curves
        .map(function (curve) {
          return utils.pointsToString(curve.points);
        })
        .join(", ") +
      "]"
    );
  }

  addCurve(curve) {
    this.curves.push(curve);
    this._3d = this._3d || curve._3d;
  }

  length() {
    return this.curves
      .map(function (v) {
        return v.length();
      })
      .reduce(function (a, b) {
        return a + b;
      });
  }

  curve(idx) {
    return this.curves[idx];
  }

  bbox() {
    const c = this.curves;
    var bbox = c[0].bbox();
    for (var i = 1; i < c.length; i++) {
      utils.expandbox(bbox, c[i].bbox());
    }
    return bbox;
  }

  offset(d) {
    const offset = [];
    this.curves.forEach(function (v) {
      offset.push(...v.offset(d));
    });
    return new PolyBezier(offset);
  }
}

export { PolyBezier };