/**
 * Copyright 2015 CANAL+ Group
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import features from "../../features";
import type { ITransportOptions, ITransportPipelines } from "../types";
import generateManifestLoader from "../utils/generate_manifest_loader";
import { addManifestIntegrityChecks } from "./integrity_checks";
import generateManifestParser from "./manifest_parser";
import generateSegmentLoader from "./segment_loader";
import generateAudioVideoSegmentParser from "./segment_parser";
import generateTextTrackLoader from "./text_loader";
import generateTextTrackParser from "./text_parser";
import { loadThumbnail, parseThumbnail } from "./thumbnails";

/**
 * Returns pipelines used for DASH streaming.
 * @param {Object} options
 * implementation. Used for each generated http request.
 * @returns {Object}
 */
export default function (options: ITransportOptions): ITransportPipelines {
  const manifestLoader = generateManifestLoader(
    { customManifestLoader: options.manifestLoader },
    mightUseDashWasmFeature() ? "text" : "arraybuffer",
    options.checkManifestIntegrity === true ? addManifestIntegrityChecks : null,
  );

  const manifestParser = generateManifestParser(options);
  const segmentLoader = generateSegmentLoader(options);
  const audioVideoSegmentParser = generateAudioVideoSegmentParser(options);
  const textTrackLoader = generateTextTrackLoader(options);
  const textTrackParser = generateTextTrackParser(options);

  return {
    transportName: "dash",
    manifest: { loadManifest: manifestLoader, parseManifest: manifestParser },
    audio: {
      loadSegment: segmentLoader,
      parseSegment: audioVideoSegmentParser,
    },
    video: {
      loadSegment: segmentLoader,
      parseSegment: audioVideoSegmentParser,
    },
    text: { loadSegment: textTrackLoader, parseSegment: textTrackParser },
    thumbnails: {
      loadThumbnail,
      parseThumbnail,
    },
  };
}

/**
 * Returns true if the DASH-WASM parser is either initialized or being
 * initialized.
 * @returns {boolean}
 */
function mightUseDashWasmFeature(): boolean {
  return (
    features.dashParsers.wasm !== null &&
    (features.dashParsers.wasm.status === "initialized" ||
      features.dashParsers.wasm.status === "initializing")
  );
}