/*
 * 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.nutz.http.sync;

import java.lang.reflect.Method;
import java.net.URI;
import org.apache.skywalking.apm.agent.core.context.ContextCarrier;
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.network.trace.component.ComponentsDefine;
import org.nutz.http.Request;
import org.nutz.http.Request.METHOD;
import org.nutz.http.Response;
import org.apache.skywalking.apm.agent.core.context.CarrierItem;
import org.apache.skywalking.apm.agent.core.context.ContextManager;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;

public class SenderSendInterceptor implements InstanceMethodsAroundInterceptor {

    @Override
    public void beforeMethod(final EnhancedInstance objInst, final Method method, final Object[] allArguments,
        final Class<?>[] argumentsTypes, final MethodInterceptResult result) throws Throwable {
        Request req = (Request) objInst.getSkyWalkingDynamicField();
        final URI requestURL = req.getUrl().toURI();
        final METHOD httpMethod = req.getMethod();
        final ContextCarrier contextCarrier = new ContextCarrier();
        String remotePeer = requestURL.getHost() + ":" + requestURL.getPort();
        AbstractSpan span = ContextManager.createExitSpan(requestURL.getPath(), contextCarrier, remotePeer);

        span.setComponent(ComponentsDefine.NUTZ_HTTP);
        Tags.URL.set(span, requestURL.getScheme() + "://" + requestURL.getHost() + ":" + requestURL.getPort() + requestURL
            .getPath());
        Tags.HTTP.METHOD.set(span, httpMethod.toString());
        SpanLayer.asHttp(span);

        CarrierItem next = contextCarrier.items();
        while (next.hasNext()) {
            next = next.next();
            req.getHeader().set(next.getHeadKey(), next.getHeadValue());
        }
    }

    @Override
    public Object afterMethod(final EnhancedInstance objInst, final Method method, final Object[] allArguments,
        final Class<?>[] argumentsTypes, Object ret) throws Throwable {
        Response response = (Response) ret;
        AbstractSpan span = ContextManager.activeSpan();

        if (response == null || response.getStatus() >= 400) {
            span.errorOccurred();
            if (response != null)
                Tags.HTTP_RESPONSE_STATUS_CODE.set(span, response.getStatus());
        }
        ContextManager.stopSpan();
        return ret;
    }

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