/**
 * This calculates a bunch of helper variables and stores them
 */
export const calculateRatios = part => {
  let { store, measurements, options } = part.shorthand();

  // Make sure collar height makes sense
  if (options.collarHeight * 2 < options.rollLineCollarHeight) options.rollLineCollarHeight = options.collarHeight * 2;

  // Calculate different values for reducing from chest to hips via waist
  store.set("chest", measurements.chestCircumference * (1 + options.chestEase));
  store.set("waist", measurements.naturalWaist * (1 + options.waistEase));
  store.set("hips", measurements.hipsCircumference * (1 + options.hipsEase));

  store.set("waistReduction",  store.get("chest") - store.get("waist"));
  store.set("hipsReduction",  store.get("chest") - store.get("hips"));
};

/**
 * Draws the line seperating side panel (back-side boundary, aka bs)
 * Note that this is without shaping, but rather the style line
 * that will be the starting point for shaping the back/side seam
 *
 * On the back, this will be drawn as-is. On the front, it will be
 * drawn, than mirrored so the part that's cut off from the back is
 * added to the front (to become the side later).
 *
 * The optional flip parameter mirrors this for the front part
 */
export const backSideBoundary = (part, flip=false) => {

  let { points, Point, paths, Path } = part.shorthand();

  points.bsArmholeHollow = points.armholeHollow.clone();
  points.bsArmholeHollowCp2 = points.armholeHollowCp2.rotate(90, points.armholeHollow);
  points.bsWaist = new Point(
    points.bsArmholeHollowCp2.x,
    points.waist.y
  );
  points.bsHips = new Point(points.bsWaist.x, points.hips.y);
  points.bsHem = new Point(points.bsWaist.x, points.hem.y);

  if (flip) {
    points.bsArmholeHollowCp1 = points.armholeHollowCp1.clone();
    points.bsArmholeCp2 = points.armholeCp2.clone();
    for (let p of [
      "bsArmholeHollow",
      "bsArmholeHollowCp2",
      "bsWaist",
      "bsHips",
      "bsHem",
      "bsArmholeHollowCp1",
      "bsArmholeCp2"
    ]) {
      points[p] = points[p].flipX(points.armhole);
    }
  }

  /** Uncomment this to see the style line without shaping
   */
  paths.bs = new Path()
    .move(points.bsHem)
    .line(points.bsWaist)
    ._curve(points.bsArmholeHollowCp2, points.bsArmholeHollow)
    .attr("class", "stroke-xl lining lashed")
  if (flip) paths.bs.curve(points.bsArmholeHollowCp1, points.bsArmholeCp2, points.armhole);
}