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/*
 * Copyright 2017-2020 original 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 io.micronaut.http.server.netty.binders;

import io.micronaut.core.annotation.Internal;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.NonBlockingBodyArgumentBinder;
import io.micronaut.http.exceptions.ContentLengthExceededException;
import io.micronaut.http.server.netty.NettyHttpRequest;
import io.micronaut.http.server.netty.NettyHttpServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.util.Optional;

/**
 * Responsible for binding to a {@link InputStream} argument from the body of the request.
 *
 * @author James Kleeh
 * @since 2.5.0
 */
@Internal
final class NettyInputStreamBodyBinder implements NonBlockingBodyArgumentBinder {

    public static final Argument TYPE = Argument.of(InputStream.class);
    private static final Logger LOG = LoggerFactory.getLogger(NettyHttpServer.class);

    NettyInputStreamBodyBinder() {
    }

    @Override
    public Argument argumentType() {
        return TYPE;
    }

    @Override
    public BindingResult bind(ArgumentConversionContext context, HttpRequest source) {
        if (source instanceof NettyHttpRequest nhr) {
            if (nhr.byteBody().expectedLength().orElse(-1) == 0) {
                return BindingResult.empty();
            }
            try {
                InputStream s = nhr.byteBody().toInputStream();
                return () -> Optional.of(s);
            } catch (ContentLengthExceededException t) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Server received error for argument [{}]: {}", context.getArgument(), t.getMessage(), t);
                }
                return BindingResult.empty();
            }
        }
        return BindingResult.empty();
    }
}