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package org.kaizen4j.common.interceptor;

import com.google.common.base.Throwables;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.apache.commons.lang3.time.StopWatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * 方法调用监控拦截器。使用示例：
 *
 *  * {@code
 *  
 *      
 *  
 *
 * 	
 * 		
 * 	
 * }
 * 
 */
public final class MonitorMethodInterceptor implements MethodInterceptor {

    private static final Logger logger = LoggerFactory.getLogger(MonitorMethodInterceptor.class);

    private static final long DEFAULT_WARN_SWITCH_MILLIS = 3 * 1000;

    private long warnSwitchMillis = DEFAULT_WARN_SWITCH_MILLIS;

    public void setWarnSwitchMillis(long warnSwitchMillis) {
        this.warnSwitchMillis = warnSwitchMillis;
    }

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        try {
            StopWatch watcher = new StopWatch();
            watcher.start();
            Object result = invocation.proceed();
            statistic(invocation, result, watcher.getTime());
            return result;
        } catch (Exception e) {
            logger.error("MonitorMethodInterceptor exception", e);
            throw new RuntimeException(e);
        }
    }

    private void statistic(MethodInvocation invocation, Object result, long executeTime) {
        String method = getMethod(invocation);
        if (logger.isDebugEnabled()) {
            String args = getArgs(invocation);
            logger.debug("Method: [{}()] Invocation Arguments: {}", method, args);
        }

        if (executeTime > warnSwitchMillis) {
            logger.warn("Method: [{}()] Invocation is very slowly: [{}] Millis", method, executeTime);
        } else if (logger.isDebugEnabled()) {
            logger.debug("Method: [{}()], Invocation Time: [{}] Millis", method, executeTime);
        }

        if (logger.isDebugEnabled() && Objects.nonNull(result)) {
            logger.debug("Method: [{}()] Invocation Result: {}", method,
                            ToStringBuilder.reflectionToString(result, ToStringStyle.MULTI_LINE_STYLE));
        }
    }

    private String getMethod(MethodInvocation invocation) {
        return invocation.getMethod().getDeclaringClass().getName() + "." + invocation.getMethod().getName();
    }

    private String getArgs(MethodInvocation invocation) {
        String args = "";
        if (Objects.nonNull(invocation.getArguments())) {
            args = Arrays.asList(invocation.getArguments()).stream()
                            .map(arg -> ToStringBuilder.reflectionToString(arg, ToStringStyle.MULTI_LINE_STYLE))
                            .collect(Collectors.joining(","));
        }
        return args;
    }

}