/*
 *  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.skywalking.apm.plugin.spring.cloud.gateway.v20x;

import io.netty.handler.codec.http.HttpHeaders;
import java.lang.reflect.Method;
import org.apache.skywalking.apm.agent.core.context.CarrierItem;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;

public class HttpclientRequestHeadersInterceptor implements InstanceMethodsAroundInterceptor {
    @Override
    public void beforeMethod(final EnhancedInstance objInst,
                             final Method method,
                             final Object[] allArguments,
                             final Class<?>[] argumentsTypes,
                             final MethodInterceptResult result) throws Throwable {
        CarrierItem next = (CarrierItem) objInst.getSkyWalkingDynamicField();
        if (next != null) {
            HttpHeaders headers = (HttpHeaders) allArguments[0];
            while (next.hasNext()) {
                next = next.next();
                headers.remove(next.getHeadKey());
                headers.set(next.getHeadKey(), next.getHeadValue());
            }
        }
    }

    @Override
    public Object afterMethod(final EnhancedInstance objInst,
                              final Method method,
                              final Object[] allArguments,
                              final Class<?>[] argumentsTypes,
                              final Object ret) throws Throwable {
        return ret;
    }

    @Override
    public void handleMethodException(final EnhancedInstance objInst,
                                      final Method method,
                                      final Object[] allArguments,
                                      final Class<?>[] argumentsTypes,
                                      final Throwable t) {

    }
}
