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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *      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.apache.camel.component.netty.http;

import java.io.InputStream;
import java.nio.charset.Charset;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePropertyKey;
import org.apache.camel.component.netty.NettyConverter;
import org.apache.camel.spi.TypeConverterRegistry;
import org.apache.camel.support.http.HttpUtil;

@Converter(generateLoader = true)
public final class NettyHttpConverter {

    private NettyHttpConverter() {
    }

    /**
     * A fallback converter that allows us to easily call Java beans and use the raw Netty {@link HttpRequest} as
     * parameter types.
     */
    @Converter(fallback = true)
    public static Object convertToHttpRequest(Class type, Exchange exchange, Object value, TypeConverterRegistry registry) {
        // if we want to covert to HttpRequest
        if (value != null && HttpRequest.class.isAssignableFrom(type)) {

            // okay we may need to cheat a bit when we want to grab the HttpRequest as its stored on the NettyHttpMessage
            // so if the message instance is a NettyHttpMessage and its body is the value, then we can grab the
            // HttpRequest from the NettyHttpMessage
            NettyHttpMessage msg = exchange.getMessage(NettyHttpMessage.class);

            if (msg != null && msg.getBody() == value) {
                // ensure the http request content is reset so we can read all the content out-of-the-box
                FullHttpRequest request = msg.getHttpRequest();
                request.content().resetReaderIndex();
                return request;
            }
        }

        return null;
    }

    /**
     * A fallback converter that allows us to easily call Java beans and use the raw Netty {@link HttpRequest} as
     * parameter types.
     */
    @Converter(fallback = true)
    public static Object convertToHttpResponse(Class type, Exchange exchange, Object value, TypeConverterRegistry registry) {
        // if we want to covert to convertToHttpResponse
        if (value != null && HttpResponse.class.isAssignableFrom(type)) {

            // okay we may need to cheat a bit when we want to grab the HttpRequest as its stored on the NettyHttpMessage
            // so if the message instance is a NettyHttpMessage and its body is the value, then we can grab the
            // HttpRequest from the NettyHttpMessage
            NettyHttpMessage msg = exchange.getMessage(NettyHttpMessage.class);

            if (msg != null && msg.getBody() == value) {
                return msg.getHttpResponse();
            }
        }

        return null;
    }

    @Converter
    public static String toString(FullHttpResponse response, Exchange exchange) {
        String contentType = response.headers().get(NettyHttpConstants.CONTENT_TYPE);
        String charset = HttpUtil.getCharsetFromContentType(contentType);
        if (charset == null && exchange != null) {
            charset = exchange.getProperty(ExchangePropertyKey.CHARSET_NAME, String.class);
        }
        if (charset != null) {
            return response.content().toString(Charset.forName(charset));
        } else {
            return response.content().toString(Charset.defaultCharset());
        }
    }

    @Converter
    public static byte[] toBytes(FullHttpResponse response, Exchange exchange) {
        return NettyConverter.toByteArray(response.content(), exchange);
    }

    @Converter
    public static InputStream toInputStream(FullHttpResponse response, Exchange exchange) {
        return NettyConverter.toInputStream(response.content(), exchange);
    }

    @Converter
    public static ByteBuf toByteBuf(NettyChannelBufferStreamCache cache, Exchange exchange) throws Exception {
        // reset so we read from the beginning of the cache stream
        cache.reset();
        int len = (int) cache.length();
        ByteBuf buf = ByteBufAllocator.DEFAULT.buffer(len);
        buf.writeBytes(cache, len);
        return buf;
    }

}