/**
 * 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 type { IManifestLoader, ILoadedManifestFormat } from "../../public_types";
import request from "../../utils/request";
import type { CancellationSignal } from "../../utils/task_canceller";
import type { IManifestLoaderOptions, IRequestedData } from "../types";
import addQueryString from "../utils/add_query_string";
import callCustomManifestLoader from "../utils/call_custom_manifest_loader";

/**
 * Manifest loader triggered if there was no custom-defined one in the API.
 * @param {string} initialUrl
 * @param {Object} loaderOptions
 * @param {Object} cancelSignal
 */
function regularManifestLoader(
  initialUrl: string | undefined,
  loaderOptions: IManifestLoaderOptions,
  cancelSignal: CancellationSignal,
): Promise<IRequestedData<ILoadedManifestFormat>> {
  if (initialUrl === undefined) {
    throw new Error("Cannot perform HTTP(s) request. URL not known");
  }

  const url =
    loaderOptions.cmcdPayload?.type === "query"
      ? addQueryString(initialUrl, loaderOptions.cmcdPayload.value)
      : initialUrl;

  return request({
    url,
    headers:
      loaderOptions.cmcdPayload?.type === "headers"
        ? loaderOptions.cmcdPayload.value
        : undefined,
    responseType: "text",
    timeout: loaderOptions.timeout,
    connectionTimeout: loaderOptions.connectionTimeout,
    cancelSignal,
  });
}

/**
 * Generate a manifest loader for the application
 * @param {Function} [customManifestLoader]
 * @returns {Function}
 */
export default function generateManifestLoader({
  customManifestLoader,
}: {
  customManifestLoader?: IManifestLoader | undefined;
}): (
  url: string | undefined,
  loaderOptions: IManifestLoaderOptions,
  cancelSignal: CancellationSignal,
) => Promise<IRequestedData<ILoadedManifestFormat>> {
  return typeof customManifestLoader !== "function"
    ? regularManifestLoader
    : callCustomManifestLoader(customManifestLoader, regularManifestLoader);
}