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/*
 * Copyright 2002-2023 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.net.URI;
import java.nio.file.Path;

import io.netty5.buffer.Buffer;
import io.netty5.handler.codec.http.headers.DefaultHttpCookiePair;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.netty5.NettyOutbound;
import reactor.netty5.http.client.HttpClientRequest;

import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.Netty5DataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ZeroCopyHttpOutputMessage;
import org.springframework.http.support.Netty5HeadersAdapter;

/**
 * {@link ClientHttpRequest} implementation for the Reactor Netty 2 (Netty 5) HTTP client.
 *
 * This class is based on {@link ReactorClientHttpRequest}.
 *
 * @author Violeta Georgieva
 * @since 6.0
 * @see reactor.netty5.http.client.HttpClient
 */
class ReactorNetty2ClientHttpRequest extends AbstractClientHttpRequest implements ZeroCopyHttpOutputMessage {

	private final HttpMethod httpMethod;

	private final URI uri;

	private final HttpClientRequest request;

	private final NettyOutbound outbound;

	private final Netty5DataBufferFactory bufferFactory;


	public ReactorNetty2ClientHttpRequest(HttpMethod method, URI uri, HttpClientRequest request, NettyOutbound outbound) {
		this.httpMethod = method;
		this.uri = uri;
		this.request = request;
		this.outbound = outbound;
		this.bufferFactory = new Netty5DataBufferFactory(outbound.alloc());
	}


	@Override
	public HttpMethod getMethod() {
		return this.httpMethod;
	}

	@Override
	public URI getURI() {
		return this.uri;
	}

	@Override
	public DataBufferFactory bufferFactory() {
		return this.bufferFactory;
	}

	@Override
	@SuppressWarnings("unchecked")
	public  T getNativeRequest() {
		return (T) this.request;
	}

	@Override
	public Mono writeWith(Publisher body) {
		return doCommit(() -> {
			// Send as Mono if possible as an optimization hint to Reactor Netty
			if (body instanceof Mono) {
				Mono bufferMono = Mono.from(body).map(Netty5DataBufferFactory::toBuffer);
				return this.outbound.send(bufferMono).then();

			}
			else {
				Flux bufferFlux = Flux.from(body).map(Netty5DataBufferFactory::toBuffer);
				return this.outbound.send(bufferFlux).then();
			}
		});
	}

	@Override
	public Mono writeAndFlushWith(Publisher> body) {
		Publisher> buffers = Flux.from(body).map(ReactorNetty2ClientHttpRequest::toBuffers);
		return doCommit(() -> this.outbound.sendGroups(buffers).then());
	}

	private static Publisher toBuffers(Publisher dataBuffers) {
		return Flux.from(dataBuffers).map(Netty5DataBufferFactory::toBuffer);
	}

	@Override
	public Mono writeWith(Path file, long position, long count) {
		return doCommit(() -> this.outbound.sendFile(file, position, count).then());
	}

	@Override
	public Mono setComplete() {
		return doCommit(this.outbound::then);
	}

	@Override
	protected void applyHeaders() {
		getHeaders().forEach((key, value) -> this.request.requestHeaders().set(key, value));
	}

	@Override
	protected void applyCookies() {
		getCookies().values().forEach(values -> values.forEach(value -> {
			DefaultHttpCookiePair cookie = new DefaultHttpCookiePair(value.getName(), value.getValue());
			this.request.addCookie(cookie);
		}));
	}

	@Override
	protected HttpHeaders initReadOnlyHeaders() {
		return HttpHeaders.readOnlyHttpHeaders(new Netty5HeadersAdapter(this.request.requestHeaders()));
	}

}