'use strict';

function isNotNull(value) {
  return value !== null;
}
function transformOrigin(options) {
  return {
    name: "transformOrigin",
    options,
    fn(data) {
      const { placement, rects, middlewareData } = data;
      const cannotCenterArrow = middlewareData.arrow?.centerOffset !== 0;
      const isArrowHidden = cannotCenterArrow;
      const arrowWidth = isArrowHidden ? 0 : options.arrowWidth;
      const arrowHeight = isArrowHidden ? 0 : options.arrowHeight;
      const [placedSide, placedAlign] = getSideAndAlignFromPlacement(placement);
      const noArrowAlign = { start: "0%", center: "50%", end: "100%" }[placedAlign];
      const arrowXCenter = (middlewareData.arrow?.x ?? 0) + arrowWidth / 2;
      const arrowYCenter = (middlewareData.arrow?.y ?? 0) + arrowHeight / 2;
      let x = "";
      let y = "";
      if (placedSide === "bottom") {
        x = isArrowHidden ? noArrowAlign : `${arrowXCenter}px`;
        y = `${-arrowHeight}px`;
      } else if (placedSide === "top") {
        x = isArrowHidden ? noArrowAlign : `${arrowXCenter}px`;
        y = `${rects.floating.height + arrowHeight}px`;
      } else if (placedSide === "right") {
        x = `${-arrowHeight}px`;
        y = isArrowHidden ? noArrowAlign : `${arrowYCenter}px`;
      } else if (placedSide === "left") {
        x = `${rects.floating.width + arrowHeight}px`;
        y = isArrowHidden ? noArrowAlign : `${arrowYCenter}px`;
      }
      return { data: { x, y } };
    }
  };
}
function getSideAndAlignFromPlacement(placement) {
  const [side, align = "center"] = placement.split("-");
  return [side, align];
}

exports.getSideAndAlignFromPlacement = getSideAndAlignFromPlacement;
exports.isNotNull = isNotNull;
exports.transformOrigin = transformOrigin;
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