import {
  DIARIZATION_FILENAME,
  type DiarizationRecord,
} from "./diarization";
import { sidecar, sidecarField } from "./sidecar-server";

export function coerceDiarization(value: unknown): DiarizationRecord | null {
  const parsed = value as Partial<DiarizationRecord> | null;
  if (
    typeof parsed?.videoId === "string" &&
    typeof parsed.generatedAt === "string" &&
    Array.isArray(parsed.turns)
  ) {
    return parsed as DiarizationRecord;
  }
  return null;
}

// Compact (one line + "\n"), as it always was.
export const diarizationSidecar = sidecar(
  DIARIZATION_FILENAME,
  sidecarField(coerceDiarization),
  { indent: 0 },
);

export const {
  path: diarizationPath,
  load: loadDiarization,
  write: writeDiarization,
} = diarizationSidecar;

// Presence of a VALID sidecar. This is the predicate the cleanup guard keys
// off, so it deliberately treats a malformed file as absent: a half-written
// diarization.json must not be what convinces the sweep it is safe to delete
// the only copy of the audio.
export async function hasDiarization(videoDir: string): Promise<boolean> {
  return (await loadDiarization(videoDir)) !== null;
}