// Stable video_name -> RGB hash (12-color palette).

const PALETTE: ReadonlyArray<readonly [number, number, number]> = [
  [231, 76, 60],
  [52, 152, 219],
  [46, 204, 113],
  [241, 196, 15],
  [155, 89, 182],
  [230, 126, 34],
  [26, 188, 156],
  [233, 30, 99],
  [3, 169, 244],
  [205, 220, 57],
  [255, 87, 34],
  [121, 85, 72],
];

const cache = new Map<string, readonly [number, number, number]>();

export function videoColorRGB(
  name: string | null | undefined,
): readonly [number, number, number] {
  const key = name ?? "";
  const hit = cache.get(key);
  if (hit) return hit;
  let h = 0;
  for (let i = 0; i < key.length; i++) {
    h = ((h << 5) - h + key.charCodeAt(i)) | 0;
  }
  const idx = ((h % PALETTE.length) + PALETTE.length) % PALETTE.length;
  const c = PALETTE[idx];
  cache.set(key, c);
  return c;
}