// Message protocol shared between the main thread (searchIndexWorkerClient) and
// the FlexSearch web worker (searchIndex.worker). Types only — safe to import
// from both sides.

// `track`: a cue from one of the record's alternate English tracks
// (lib/captionTracks.ts) — absent for the transcript's own.
export type IndexHit = { slug: string; start?: number; text: string; track?: string };

// Main thread → worker.
export type WorkerRequest =
  | { type: "build"; reqId: number; slug: string }
  | { type: "search"; reqId: number; slug: string; term: string; limit: number }
  | { type: "status"; reqId: number; slug: string }
  | { type: "drop"; reqId: number; slug: string };

// Worker → main thread.
export type WorkerResponse =
  | { type: "progress"; reqId: number; slug: string; done: number; total: number }
  | { type: "built"; reqId: number; slug: string; docCount: number }
  | { type: "result"; reqId: number; slug: string; hits: IndexHit[] }
  | { type: "status"; reqId: number; slug: string; ready: boolean; docCount: number }
  | { type: "dropped"; reqId: number; slug: string }
  | { type: "error"; reqId: number; slug: string; message: string };