/* PCO Plan — how a song key is written.

   Planning Center stores keys as typed: "Bb", "F#m", "Ab". Every tile in this
   module shows them as notes instead — B♭, F♯m, A♭ — so the plan, the badge
   on an item and the Song Key tile all agree. Shared rather than repeated
   because the day one of them changes, they all should. */

/** "F#m" → { note: 'F', accidental: '♯', quality: 'm' }; anything odd → null. */
export function parseKey(raw) {
  const match = /^([A-G])\s*([#b♯♭]?)\s*(.*)$/.exec(String(raw || '').trim());
  if (!match) return null;
  const [, note, accidental, quality] = match;
  return {
    note,
    accidental: accidental === '#' ? '♯' : accidental === 'b' ? '♭' : accidental,
    quality: quality.trim(),
  };
}

/** The same thing as one string, for a badge or a caption. */
export function prettyKey(raw) {
  const parts = parseKey(raw);
  if (!parts) return String(raw || '').trim();
  return `${parts.note}${parts.accidental}${parts.quality}`;
}