"use strict";

// Pure math and canvas utilities shared across modules.
const TLUtils = (() => {
  const clamp = (x, a, b) => Math.max(a, Math.min(b, x));
  const fmt   = (x, d = 3) => Number.isFinite(x) ? x.toFixed(d) : "NaN";
  const sign  = (x) => (x > 0) - (x < 0);

  function getDPR() {
    return Math.max(1, Math.floor(window.devicePixelRatio || 1));
  }

  // Scale canvas internal buffer to match CSS size × device pixel ratio,
  // returning a logical-pixel coordinate system via ctx.setTransform.
  function resizeCanvasToCSS(canvas) {
    const dpr  = getDPR();
    const cssW = canvas.clientWidth;
    const cssH = Math.round(cssW * (canvas.height / canvas.width));
    canvas.width  = Math.round(cssW * dpr);
    canvas.height = Math.round(cssH * dpr);
    const ctx = canvas.getContext("2d");
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    return { ctx, w: cssW, h: cssH, dpr };
  }

  return { clamp, fmt, sign, getDPR, resizeCanvasToCSS };
})();