export const constructMainDart = part => {
  let { measurements, options, points, Point, store } = part.shorthand();

  let reduce = {};
  let chest = measurements.chestCircumference * (1 + options.chestEase);
  let waist = measurements.naturalWaist * (1 + options.waistEase);
  let hips = measurements.hipsCircumference * (1 + options.hipsEase);

  reduce.waist = chest - waist;
  reduce.hips = chest - hips;
  if (reduce.hips < 0) reduce.hips = 0;
  if (reduce.waist < 0) reduce.waist = 0;

  let wr12 = reduce.waist / 12;
  let hr12 = reduce.hips / 12;
  store.set("wr12", wr12);
  store.set("hr12", hr12);

  points.dartWaistCenter = new Point(points.armhole.x / 2, points.waist.y);
  points.dartWaistRight = points.dartWaistCenter.shift(0, wr12);
  points.dartWaistLeft = points.dartWaistCenter.shift(180, wr12);
  points.dartTop = points.dartWaistCenter.shift(
    90,
    points.neck.dy(points.waist) * 0.35
  );
  points.dartWaistRightCpTop = points.dartWaistRight.shift(
    90,
    points.dartTop.dy(points.waist) * 0.35
  );
  points.dartWaistLeftCpTop = points.dartWaistLeft.shift(
    90,
    points.dartTop.dy(points.waist) * 0.35
  );
  points.dartHipCenter = new Point(points.dartWaistCenter.x, points.hips.y);
  points.dartHipRight = points.dartHipCenter.shift(0, hr12);
  points.dartHipLeft = points.dartHipCenter.shift(180, hr12);
  points.dartHemRight = new Point(points.dartHipRight.x, points.hem.y);
  points.dartHemLeft = new Point(points.dartHipLeft.x, points.hem.y);
  points.dartHipRightCpTop = points.dartHipRight.shift(
    90,
    points.waist.dy(points.hips) * 0.25
  );
  points.dartHipLeftCpTop = points.dartHipLeft.shift(
    90,
    points.waist.dy(points.hips) * 0.25
  );
  points.dartWaistRightCpBottom = points.dartWaistRight.shift(
    -90,
    points.waist.dy(points.hips) * 0.25
  );
  points.dartWaistLeftCpBottom = points.dartWaistLeft.shift(
    -90,
    points.waist.dy(points.hips) * 0.25
  );
};

export const shapeSideSeam = part => {
  let { points, Point, store } = part.shorthand();
  let wr12 = store.get("wr12");
  let hr12 = store.get("hr12");

  points.waist = points.waist.shift(180, wr12);
  points.waistCp2 = new Point(points.waist.x, points.dartWaistRightCpTop.y);
  points.waistCp1 = new Point(points.waist.x, points.dartWaistRightCpBottom.y);
  points.hips = points.hips.shift(180, hr12);
  points.hipsCp2 = new Point(points.hips.x, points.dartHipRightCpTop.y);
  points.hem = points.hem.shift(180, hr12);
};

export const dartPath = part => {
  let { Path, points } = part.shorthand();
  return new Path()
    .move(points.dartStart)
    .line(points.dartHipLeft)
    .curve(
      points.dartHipLeftCpTop,
      points.dartWaistLeftCpBottom,
      points.dartWaistLeft
    )
    .curve_(points.dartWaistLeftCpTop, points.dartTop)
    ._curve(points.dartWaistRightCpTop, points.dartWaistRight)
    .curve(
      points.dartWaistRightCpBottom,
      points.dartHipRightCpTop,
      points.dartHipRight
    )
    .line(points.dartEnd);
};