import {
  DOWNLOAD_OUTCOME_FILENAME,
  DOWNLOAD_OUTCOME_STATUS_VALUES,
  type DownloadOutcomeRecord,
  type DownloadOutcomeStatus,
} from "./downloadOutcome";
import { sidecar, sidecarField } from "./sidecar-server";

export function coerceDownloadOutcome(
  value: unknown,
): DownloadOutcomeRecord | null {
  const parsed = value as Partial<DownloadOutcomeRecord> | null;
  if (
    typeof parsed?.status === "string" &&
    (DOWNLOAD_OUTCOME_STATUS_VALUES as string[]).includes(parsed.status) &&
    typeof parsed.videoId === "string" &&
    typeof parsed.startedAt === "string" &&
    typeof parsed.finishedAt === "string" &&
    Array.isArray(parsed.attempts)
  ) {
    // Cast: status is already narrowed to a member of the enum tuple.
    return parsed as DownloadOutcomeRecord;
  }
  return null;
}

export const downloadOutcomeSidecar = sidecar(
  DOWNLOAD_OUTCOME_FILENAME,
  sidecarField(coerceDownloadOutcome),
);

export const {
  path: downloadOutcomePath,
  load: loadDownloadOutcome,
  write: writeDownloadOutcome,
} = downloadOutcomeSidecar;

// Narrow re-export so callers don't have to import from both modules.
export type { DownloadOutcomeStatus };