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/*
 * Copyright 2017-2023 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.Experimental;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.RequestArgumentBinder;
import io.micronaut.http.netty.stream.StreamedHttpRequest;
import io.micronaut.http.server.netty.NettyHttpRequest;

import java.util.Optional;

/**
 * A version of {@link RequestArgumentBinder} that requires {@link NettyHttpRequest} and {@link StreamedHttpRequest}.
 *
 * @param  A type
 * @author Denis Stepanov
 * @since 4.0.0
 */
@Experimental
public interface StreamedNettyRequestArgumentBinder extends RequestArgumentBinder {

    @Override
    default BindingResult bind(ArgumentConversionContext context, HttpRequest source) {
        if (source instanceof NettyHttpRequest nettyHttpRequest) {
            io.netty.handler.codec.http.HttpRequest nativeRequest = nettyHttpRequest.getNativeRequest();
            if (nativeRequest instanceof StreamedHttpRequest streamedHttpRequest) {
                return bindForStreamedNettyRequest(context, streamedHttpRequest, nettyHttpRequest);
            }
        }
        return BindingResult.empty();
    }

    /**
     * Bind the given argument from the given source.
     *
     * @param context             The {@link ArgumentConversionContext}
     * @param streamedHttpRequest The streamed HTTP request
     * @param nettyHttpRequest    The netty http request
     * @return An {@link Optional} of the value. If no binding was possible {@link Optional#empty()}
     */
    BindingResult bindForStreamedNettyRequest(ArgumentConversionContext context,
                                                 StreamedHttpRequest streamedHttpRequest,
                                                 NettyHttpRequest nettyHttpRequest);
}