export function getContrastYIQ(hexcolor: string) {
  // Remove leading # if present
  if (hexcolor.startsWith("#")) {
    hexcolor = hexcolor.slice(1);
  }

  // Handle 3-digit hex codes (e.g., #abc → #aabbcc)
  if (hexcolor.length === 3) {
    hexcolor = hexcolor
      .split("")
      .map((c) => c + c)
      .join("");
  }

  // Parse RGB values
  const r = parseInt(hexcolor.substring(0, 2), 16);
  const g = parseInt(hexcolor.substring(2, 2), 16);
  const b = parseInt(hexcolor.substring(4, 2), 16);

  // Calculate YIQ brightness
  const yiq = (r * 299 + g * 587 + b * 114) / 1000;

  // Return black or white based on contrast
  return yiq >= 128 ? "black" : "white";
}