﻿/*
 * 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.
 */

namespace DotPulsar.Internal
{
    using System;
    using System.Threading;
    using System.Threading.Tasks;

    public sealed class CancelableCompletionSource<T> : IDisposable
    {
        private readonly TaskCompletionSource<T> _source;
        private CancellationTokenRegistration? _registration;

        public CancelableCompletionSource()
            => _source = new TaskCompletionSource<T>(TaskCreationOptions.RunContinuationsAsynchronously);

        public void SetupCancellation(Action callback, CancellationToken token)
            => _registration = token.Register(callback);

        public void SetResult(T result)
            => _ = _source.TrySetResult(result);

        public void SetException(Exception exception)
            => _ = _source.TrySetException(exception);

        public Task<T> Task => _source.Task;

        public void Dispose()
        {
            _ = _source.TrySetCanceled();
            _registration?.Dispose();
        }
    }
}