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/*
 * This file is part of Log4Jdbc.
 *
 * Log4Jdbc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Log4Jdbc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Log4Jdbc.  If not, see .
 *
 */
package fr.ms.lang.reflect;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import fr.ms.lang.delegate.DefaultStringMakerFactory;
import fr.ms.lang.delegate.DefaultSyncLongFactory;
import fr.ms.lang.delegate.StringMaker;
import fr.ms.lang.delegate.StringMakerFactory;
import fr.ms.lang.delegate.SyncLong;
import fr.ms.lang.delegate.SyncLongFactory;

/**
 *
 * @see Marco4J
 *
 *
 * @author Marco Semiao
 *
 */
public class TraceTimeInvocationHandler implements InvocationHandler {

    private final static StringMakerFactory stringFactory = DefaultStringMakerFactory.getInstance();

    private final static SyncLongFactory syncLongFactory = DefaultSyncLongFactory.getInstance();

    private final InvocationHandler invocationHandler;

    private static long maxTime;

    private static String maxMethodName;

    private static SyncLong averageTime = syncLongFactory.newLong();
    private static SyncLong quotient = syncLongFactory.newLong();

    public TraceTimeInvocationHandler(final InvocationHandler invocationHandler) {
	this.invocationHandler = invocationHandler;
    }

    public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
	final long start = System.currentTimeMillis();

	final TimeInvocation invokeTime = (TimeInvocation) invocationHandler.invoke(proxy, method, args);

	final long end = System.currentTimeMillis();

	final long time = (end - start) - invokeTime.getExecTime();

	final String methodName = getMethodCall(method.getDeclaringClass().getName() + "." + method.getName(), args);

	if (time > maxTime) {
	    maxTime = time;
	    maxMethodName = methodName;
	}

	averageTime.addAndGet(time);

	final StringMaker sb = stringFactory.newString();
	sb.append("Time Process : ");
	sb.append(time);
	sb.append(" ms - Average Time : ");
	sb.append(averageTime.get() / quotient.incrementAndGet());
	sb.append(" ms - Method Name : ");
	sb.append(methodName);
	sb.append(" - Max Time Process : ");
	sb.append(maxTime);
	sb.append(" ms - Max Method Name : ");
	sb.append(maxMethodName);

	System.out.println(sb.toString());

	return invokeTime.getInvoke();
    }

    public static String getMethodCall(final String methodName, final Object[] args) {
	final StringMaker sb = stringFactory.newString();
	sb.append(methodName);
	sb.append("(");

	if (args != null) {
	    for (int i = 0; i < args.length; i++) {
		final Object arg = args[i];
		sb.append(arg.getClass());
		if (i < args.length - 1) {
		    sb.append(",");
		}
	    }
	}
	sb.append(");");

	return sb.toString();
    }
}