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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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.netty.handler.codec.http;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.CombinedChannelDuplexHandler;

import java.util.ArrayDeque;
import java.util.List;
import java.util.Queue;

import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_CHUNK_SIZE;
import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_HEADER_SIZE;
import static io.netty.handler.codec.http.HttpObjectDecoder.DEFAULT_MAX_INITIAL_LINE_LENGTH;

/**
 * A combination of {@link HttpRequestDecoder} and {@link HttpResponseEncoder}
 * which enables easier server side HTTP implementation.
 *
 * @see HttpClientCodec
 */
public final class HttpServerCodec extends CombinedChannelDuplexHandler
        implements HttpServerUpgradeHandler.SourceCodec {

    /** A queue that is used for correlating a request and a response. */
    private final Queue queue = new ArrayDeque();

    /**
     * Creates a new instance with the default decoder options
     * ({@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
     * {@code maxChunkSize (8192)}).
     */
    public HttpServerCodec() {
        this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CHUNK_SIZE);
    }

    /**
     * Creates a new instance with the specified decoder options.
     */
    public HttpServerCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
        init(new HttpServerRequestDecoder(maxInitialLineLength, maxHeaderSize, maxChunkSize),
                new HttpServerResponseEncoder());
    }

    /**
     * Creates a new instance with the specified decoder options.
     */
    public HttpServerCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders) {
        init(new HttpServerRequestDecoder(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders),
                new HttpServerResponseEncoder());
    }

    /**
     * Creates a new instance with the specified decoder options.
     */
    public HttpServerCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
                           int initialBufferSize) {
        init(
          new HttpServerRequestDecoder(maxInitialLineLength, maxHeaderSize, maxChunkSize,
                  validateHeaders, initialBufferSize),
          new HttpServerResponseEncoder());
    }

    /**
     * Creates a new instance with the specified decoder options.
     */
    public HttpServerCodec(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
                           int initialBufferSize, boolean allowDuplicateContentLengths) {
        init(new HttpServerRequestDecoder(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders,
                                          initialBufferSize, allowDuplicateContentLengths),
             new HttpServerResponseEncoder());
    }

    /**
     * Upgrades to another protocol from HTTP. Removes the {@link HttpRequestDecoder} and
     * {@link HttpResponseEncoder} from the pipeline.
     */
    @Override
    public void upgradeFrom(ChannelHandlerContext ctx) {
        ctx.pipeline().remove(this);
    }

    private final class HttpServerRequestDecoder extends HttpRequestDecoder {

        HttpServerRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
            super(maxInitialLineLength, maxHeaderSize, maxChunkSize);
        }

        HttpServerRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,
                                        boolean validateHeaders) {
            super(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders);
        }

        HttpServerRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,

                                        boolean validateHeaders, int initialBufferSize) {
            super(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders, initialBufferSize);
        }

        HttpServerRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,
                                 boolean validateHeaders, int initialBufferSize, boolean allowDuplicateContentLengths) {
            super(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders, initialBufferSize,
                  allowDuplicateContentLengths);
        }

        @Override
        protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List