/*
 * Copyright 2002-2020 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.web.reactive.function.client;

import java.util.List;

import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import org.springframework.http.ResponseEntity;

/**
 * Internal methods shared between {@link DefaultWebClient} and {@link DefaultClientResponse}.
 *
 * @author Arjen Poutsma
 * @since 5.2
 */
abstract class WebClientUtils {

	private static final String VALUE_NONE = "\n\t\t\n\t\t\n\uE000\uE001\uE002\n\t\t\t\t\n";


	/**
	 * Map the given response to a single value {@code ResponseEntity<T>}.
	 */
	@SuppressWarnings("unchecked")
	public static <T> Mono<ResponseEntity<T>> mapToEntity(ClientResponse response, Mono<T> bodyMono) {
		return ((Mono<Object>) bodyMono).defaultIfEmpty(VALUE_NONE).map(body ->
				ResponseEntity.status(response.rawStatusCode())
						.headers(response.headers().asHttpHeaders())
						.body(body != VALUE_NONE ? (T) body : null));
	}

	/**
	 * Map the given response to a {@code ResponseEntity<List<T>>}.
	 */
	public static <T> Mono<ResponseEntity<List<T>>> mapToEntityList(ClientResponse response, Publisher<T> body) {
		return Flux.from(body).collectList().map(list ->
				ResponseEntity.status(response.rawStatusCode())
						.headers(response.headers().asHttpHeaders())
						.body(list));
	}

}
