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/*
 * Copyright 2002-2024 the original author or authors.
 *
 * 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
 *
 *      https://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.
 */

package org.springframework.http.client.reactive;

import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;

import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.publisher.Flux;

import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.ResponseCookie;
import org.springframework.util.Assert;
import org.springframework.util.MultiValueMap;

/**
 * Base class for {@link ClientHttpResponse} implementations.
 *
 * @author Arjen Poutsma
 * @since 5.3.32
 */
public abstract class AbstractClientHttpResponse implements ClientHttpResponse {

	private final HttpStatusCode statusCode;

	private final HttpHeaders headers;

	private final MultiValueMap cookies;

	private final Flux body;



	protected AbstractClientHttpResponse(HttpStatusCode statusCode, HttpHeaders headers,
			MultiValueMap cookies, Flux body) {

		Assert.notNull(statusCode, "StatusCode must not be null");
		Assert.notNull(headers, "Headers must not be null");
		Assert.notNull(body, "Body must not be null");

		this.statusCode = statusCode;
		this.headers = headers;
		this.cookies = cookies;
		this.body = Flux.from(new SingleSubscriberPublisher<>(body));
	}


	@Override
	public HttpStatusCode getStatusCode() {
		return this.statusCode;
	}

	@Override
	public HttpHeaders getHeaders() {
		return this.headers;
	}

	@Override
	public MultiValueMap getCookies() {
		return this.cookies;
	}

	@Override
	public Flux getBody() {
		return this.body;
	}


	private static final class SingleSubscriberPublisher implements Publisher {

		private static final Subscription NO_OP_SUBSCRIPTION = new Subscription() {
			@Override
			public void request(long l) {
			}

			@Override
			public void cancel() {
			}
		};

		private final Publisher delegate;

		private final AtomicBoolean subscribed = new AtomicBoolean();


		public SingleSubscriberPublisher(Publisher delegate) {
			this.delegate = delegate;
		}

		@Override
		public void subscribe(Subscriber subscriber) {
			Objects.requireNonNull(subscriber, "Subscriber must not be null");
			if (this.subscribed.compareAndSet(false, true)) {
				this.delegate.subscribe(subscriber);
			}
			else {
				subscriber.onSubscribe(NO_OP_SUBSCRIPTION);
				subscriber.onError(new IllegalStateException("The client response body can only be consumed once"));
			}
		}
	}
}