/*
 * Zed Attack Proxy (ZAP) and its related class files.
 *
 * ZAP is an HTTP/HTTPS proxy for assessing web application security.
 *
 * Copyright 2022 The ZAP Development Team
 *
 * 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.
 */
package org.zaproxy.addon.network.internal.client.apachev5.h2;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.hc.core5.http.nio.AsyncEntityProducer;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.parosproxy.paros.network.HttpBody;

public class HttpBodyAsyncEntityProducer implements AsyncEntityProducer {

    private final ByteBuffer bytebuf;
    private final int length;
    private final AtomicReference<Exception> exception;

    public HttpBodyAsyncEntityProducer(HttpBody httpBody) {
        this.bytebuf = ByteBuffer.wrap(httpBody.getBytes());
        this.length = this.bytebuf.remaining();
        this.exception = new AtomicReference<>();
    }

    @Override
    public boolean isRepeatable() {
        return true;
    }

    @Override
    public final String getContentType() {
        return null;
    }

    @Override
    public long getContentLength() {
        return length;
    }

    @Override
    public int available() {
        return Integer.MAX_VALUE;
    }

    @Override
    public String getContentEncoding() {
        return null;
    }

    @Override
    public boolean isChunked() {
        return false;
    }

    @Override
    public Set<String> getTrailerNames() {
        return null;
    }

    @Override
    public final void produce(final DataStreamChannel channel) throws IOException {
        if (bytebuf.hasRemaining()) {
            channel.write(bytebuf);
        }
        if (!bytebuf.hasRemaining()) {
            channel.endStream();
        }
    }

    @Override
    public final void failed(final Exception cause) {
        if (exception.compareAndSet(null, cause)) {
            releaseResources();
        }
    }

    @Override
    public void releaseResources() {
        bytebuf.clear();
    }
}
