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/*
 * Copyright (c) 2017-2021 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
 *
 *     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.eclipse.jetty.reactive.client.internal;

import java.nio.ByteBuffer;
import java.util.Iterator;
import org.eclipse.jetty.client.AsyncContentProvider;
import org.eclipse.jetty.client.api.ContentProvider;
import org.eclipse.jetty.client.util.DeferredContentProvider;
import org.eclipse.jetty.reactive.client.ContentChunk;
import org.eclipse.jetty.reactive.client.ReactiveRequest;
import org.eclipse.jetty.util.Callback;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

public class PublisherContentProvider implements ContentProvider.Typed, AsyncContentProvider, Subscriber {
    private final DeferredContentProvider provider = new DeferredContentProvider();
    private final ReactiveRequest.Content content;
    private Subscription subscription;

    public PublisherContentProvider(ReactiveRequest.Content content) {
        this.content = content;
        content.subscribe(this);
    }

    @Override
    public long getLength() {
        return content.getLength();
    }

    @Override
    public String getContentType() {
        return content.getContentType();
    }

    @Override
    public void setListener(Listener listener) {
        provider.setListener(listener);
    }

    @Override
    public Iterator iterator() {
        return provider.iterator();
    }

    @Override
    public void onSubscribe(Subscription subscription) {
        this.subscription = subscription;
        subscription.request(1);
    }

    @Override
    public void onNext(ContentChunk chunk) {
        provider.offer(chunk.buffer, new Callback.Nested(chunk.callback) {
            @Override
            public void succeeded() {
                super.succeeded();
                subscription.request(1);
            }

            @Override
            public void failed(Throwable x) {
                super.failed(x);
                subscription.cancel();
            }
        });
    }

    @Override
    public void onError(Throwable failure) {
        provider.failed(failure);
    }

    @Override
    public void onComplete() {
        provider.close();
    }

    @Override
    public String toString() {
        return String.format("%s@%x", getClass().getSimpleName(), hashCode());
    }
}