/*
 * 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.shardingsphere.elasticjob.restful.pipeline;

import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.shardingsphere.elasticjob.restful.Filter;
import org.apache.shardingsphere.elasticjob.restful.filter.DefaultFilterChain;
import org.apache.shardingsphere.elasticjob.restful.filter.FilterChain;
import org.apache.shardingsphere.elasticjob.restful.handler.HandleContext;
import org.apache.shardingsphere.elasticjob.restful.handler.Handler;

import java.util.List;

/**
 * Filter chain inbound handler.
 */
@Slf4j
@Sharable
@RequiredArgsConstructor
public final class FilterChainInboundHandler extends ChannelInboundHandlerAdapter {
    
    private final List<Filter> filterInstances;
    
    @SuppressWarnings({"NullableProblems", "unchecked"})
    @Override
    public void channelRead(final ChannelHandlerContext ctx, final Object msg) {
        if (filterInstances.isEmpty()) {
            ctx.fireChannelRead(msg);
            return;
        }
        HandleContext<Handler> handleContext = (HandleContext<Handler>) msg;
        FilterChain filterChain = new DefaultFilterChain(filterInstances, ctx, handleContext);
        filterChain.next(handleContext.getHttpRequest());
    }
}
