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/*
 * Copyright 2014 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 com.taobao.arthas.grpcweb.proxy;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultHttpContent;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.stream.ChunkedInput;

/**
 * 和 LastHttpContent 对比，少了 LastHttpContent.EMPTY_LAST_CONTENT
 * 
 * @see LastHttpContent
 * @see LastHttpContent#EMPTY_LAST_CONTENT
 */
public class SingleHttpChunkedInput implements ChunkedInput {

    private final ChunkedInput input;

    /**
     * Creates a new instance using the specified input.
     * @param input {@link ChunkedInput} containing data to write
     */
    public SingleHttpChunkedInput(ChunkedInput input) {
        this.input = input;
//        lastHttpContent = LastHttpContent.EMPTY_LAST_CONTENT;
    }

    /**
     * Creates a new instance using the specified input. {@code lastHttpContent} will be written as the terminating
     * chunk.
     * @param input {@link ChunkedInput} containing data to write
     * @param lastHttpContent {@link LastHttpContent} that will be written as the terminating chunk. Use this for
     *            training headers.
     */
    public SingleHttpChunkedInput(ChunkedInput input, LastHttpContent lastHttpContent) {
        this.input = input;
//        this.lastHttpContent = lastHttpContent;
    }

    @Override
    public boolean isEndOfInput() throws Exception {
        if (input.isEndOfInput()) {
            // Only end of input after last HTTP chunk has been sent
            return true;
        } else {
            return false;
        }
    }

    @Override
    public void close() throws Exception {
        input.close();
    }

    @Deprecated
    @Override
    public HttpContent readChunk(ChannelHandlerContext ctx) throws Exception {
        return readChunk(ctx.alloc());
    }

    @Override
    public HttpContent readChunk(ByteBufAllocator allocator) throws Exception {
        if (input.isEndOfInput()) {
            return null;
        } else {
            ByteBuf buf = input.readChunk(allocator);
            if (buf == null) {
                return null;
            }
            return new DefaultHttpContent(buf);
        }
    }

    @Override
    public long length() {
        return input.length();
    }

    @Override
    public long progress() {
        return input.progress();
    }
}