/*
 * 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.jedis.v2;

import java.lang.reflect.Method;

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.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;
import org.apache.skywalking.apm.util.StringUtil;

public class JedisMethodInterceptor implements InstanceMethodsAroundInterceptor {

    private static final String ABBR = "...";
    private static final String DELIMITER_SPACE = " ";

    @Override
    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        MethodInterceptResult result) throws Throwable {
        String peer = String.valueOf(objInst.getSkyWalkingDynamicField());
        AbstractSpan span = ContextManager.createExitSpan("Jedis/" + method.getName(), peer);
        span.setComponent(ComponentsDefine.JEDIS);
        Tags.DB_TYPE.set(span, "Redis");
        SpanLayer.asCache(span);

        if (allArguments.length > 0 && allArguments[0] instanceof String) {
            Tags.DB_STATEMENT.set(span, getDBStatement(method.getName(), (String) allArguments[0]));
        } else if (allArguments.length > 0 && allArguments[0] instanceof byte[]) {
            Tags.DB_STATEMENT.set(span, method.getName());
        }
    }

    private String getDBStatement(String methodName, String argument) {
        StringBuilder dbStatement = new StringBuilder(methodName);
        if (JedisPluginConfig.Plugin.Jedis.TRACE_REDIS_PARAMETERS && !StringUtil.isEmpty(argument)) {
            dbStatement.append(DELIMITER_SPACE);
            if (argument.length() > JedisPluginConfig.Plugin.Jedis.REDIS_PARAMETER_MAX_LENGTH) {
                argument = argument.substring(0, JedisPluginConfig.Plugin.Jedis.REDIS_PARAMETER_MAX_LENGTH) + ABBR;
            }
            dbStatement.append(argument);
        }
        return dbStatement.toString();
    }

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

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