import { Cue, TextTrack } from "../../media/types/index.js";
import { MessageActor } from "../../core/actors/create-machine-actor.js";
import { ForwardBufferConfig } from "../../media/buffer/forward-buffer.js";
import { TextMessagePipelines } from "../primitives/text-segment-load-pipeline.js";
import "./text-tracks.js";
//#region src/playback/actors/text-track-segment-loader.d.ts
/**
 * Mirrors the v/a `SegmentLoaderMessage` shape. `range` carries the
 * forward-window anchor (`range.start` is treated as the load anchor;
 * the actor computes its own forward window internally via
 * `getSegmentsToLoad`). When `range` is omitted (metadata mode), this
 * actor is a no-op — text tracks have no init-segment concept.
 */
type TextTrackSegmentLoaderMessage = {
  type: 'load';
  track: TextTrack;
  range?: {
    start: number;
    end: number;
  };
};
/** Finite states of the actor. */
type TextTrackSegmentLoaderActorState = 'idle' | 'loading' | 'destroyed';
/** Non-finite (extended) data managed by the actor. */
interface TextTrackSegmentLoaderActorContext {
  /**
   * Track ID of the segment currently being fetched, or null. Paired
   * with `inFlightSegmentId` so the continue-vs-preempt check survives
   * cross-track segment-id collisions (e.g. each track starts at
   * `seg-0`).
   */
  inFlightTrackId: string | null;
  /**
   * Segment ID currently being fetched, or null. Used together with
   * `inFlightTrackId` by the `loading` state's `load` handler.
   */
  inFlightSegmentId: string | null;
}
type TextTrackSegmentLoaderActor = MessageActor<TextTrackSegmentLoaderActorState, TextTrackSegmentLoaderActorContext, TextTrackSegmentLoaderMessage>;
/**
 * Configuration for `createTextTrackSegmentLoaderActor`. Spread over
 * `DEFAULT_FORWARD_BUFFER_CONFIG` to override individual forward-window
 * fields (e.g. `bufferDuration`). Text tracks don't have a back-buffer
 * concern — cues evict by their playhead-relative window at runtime —
 * so no `backBuffer` config field.
 */
interface TextTrackSegmentLoaderActorConfig<C extends Cue = Cue> {
  forwardBuffer?: Partial<ForwardBufferConfig>;
  /** Ordered step pipeline. Defaults to {@link DEFAULT_TEXT_MESSAGE_PIPELINES} (`resolveCues → dispatchCues`). */
  messagePipelines?: TextMessagePipelines<C>;
}
//#endregion
export { TextTrackSegmentLoaderActor, TextTrackSegmentLoaderActorConfig, TextTrackSegmentLoaderActorContext, TextTrackSegmentLoaderActorState, TextTrackSegmentLoaderMessage };
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