import { type Analysis, origin } from "../theory/analysis.ts";

/** the class that colours a chord by where it comes from, relative to the key */
export function originClass(a: Analysis | undefined): string {
  const from = a && origin(a);
  if (from === "home" || from === "sharp" || from === "flat" || from === "inverse")
    return `on-${from}`;
  return from ? `from-${from}` : a ? "chromatic" : "";
}