/*
Copyright 2026 The Matrix.org Foundation C.I.C.

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 { PollingCachedValue } from "./pollingCachedValue.js";
import { ClientEvent } from "./client.js";
import { MatrixError } from "./http-api/index.js";
const TRANSPORT_CACHE_TTL_MILLISECONDS = 1000 * 60 * 60 * 24; // 1 day

/**
 * Builds a cache for the rtc/transport discovery end-point of the given client.
 */
export function createRtcTransportsCachedValue(client, logger) {
  return new PollingCachedValue({
    name: "RTCTransports",
    logger,
    ttlMillis: TRANSPORT_CACHE_TTL_MILLISECONDS,
    fetch: () => client._unstable_getRTCTransports(),
    onValueCached: transports => client.emit(ClientEvent.RtcTransportsUpdated, transports),
    // If the end point is not supported by the homeserver it will be a 404 error.
    // This is a final error, it can be cached, no need to retry everytime.
    // It will retry when ttl has expired.
    shouldCacheError: error => error instanceof MatrixError && error.httpStatus === 404
  });
}
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