/*
 * 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.vertx3;

import io.netty.handler.codec.http.HttpRequest;
import org.apache.skywalking.apm.agent.core.context.CarrierItem;
import org.apache.skywalking.apm.agent.core.context.ContextCarrier;
import org.apache.skywalking.apm.agent.core.context.ContextManager;
import org.apache.skywalking.apm.agent.core.context.tag.Tags;
import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
import org.apache.skywalking.apm.agent.core.context.trace.SpanLayer;
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;
import org.apache.skywalking.apm.network.trace.component.ComponentsDefine;

import java.lang.reflect.Method;

public class ServerConnectionHandleMessageInterceptor implements InstanceMethodsAroundInterceptor {

    @Override
    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        MethodInterceptResult result) throws Throwable {
        if (allArguments[0] instanceof HttpRequest) {
            HttpRequest request = (HttpRequest) allArguments[0];
            ContextCarrier contextCarrier = new ContextCarrier();
            CarrierItem next = contextCarrier.items();
            while (next.hasNext()) {
                next = next.next();
                next.setHeadValue(request.headers().get(next.getHeadKey()));
                request.headers().remove(next.getHeadKey());
            }

            AbstractSpan span = ContextManager.createEntrySpan("{" + request.getMethod() + "}" + toPath(request.getUri()), contextCarrier);
            span.setComponent(ComponentsDefine.VERTX);
            SpanLayer.asHttp(span);
            Tags.HTTP.METHOD.set(span, request.getMethod().toString());
            Tags.URL.set(span, request.getUri());

            objInst.setSkyWalkingDynamicField(new VertxContext(ContextManager.capture(), span.prepareForAsync()));
        }
    }

    @Override
    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        Object ret) throws Throwable {
        if (allArguments[0] instanceof HttpRequest) {
            ContextManager.stopSpan();
        }
        return ret;
    }

    @Override
    public void handleMethodException(EnhancedInstance objInst, Method method, Object[] allArguments,
        Class<?>[] argumentsTypes, Throwable t) {
        ContextManager.activeSpan().log(t);
    }

    private static String toPath(String uri) {
        int index = uri.indexOf("?");
        if (index > -1) {
            return uri.substring(0, index);
        } else {
            return uri;
        }
    }
}
