// Copyright (c) 2017-2022 Cloudflare, Inc.
// Licensed under the Apache 2.0 license found in the LICENSE file or at:
//     https://opensource.org/licenses/Apache-2.0
//
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

import { isIterable, isNodeStream } from 'node-internal:streams_util';
import { finished } from 'node-internal:streams_end_of_stream';

import { pipelineImpl as pl } from 'node-internal:streams_pipeline';

export { finished };

export function pipeline(...streams: unknown[]): Promise<unknown> {
  return new Promise((resolve, reject) => {
    let signal: AbortSignal | undefined;
    let end: boolean | undefined;
    const lastArg = streams[streams.length - 1];
    if (
      lastArg &&
      typeof lastArg === 'object' &&
      !isNodeStream(lastArg) &&
      !isIterable(lastArg)
    ) {
      const options = streams.pop() as { signal?: AbortSignal; end?: boolean };
      signal = options.signal;
      end = options.end;
    }
    pl(
      streams,
      (err: Error | null, value: unknown) => {
        if (err) {
          reject(err);
        } else {
          resolve(value);
        }
      },
      {
        signal,
        end,
      }
    );
  });
}

export const promises = {
  pipeline,
  finished,
};