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package org.ar4k.agent.helper;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;

import org.ar4k.agent.logger.EdgeLogger;
import org.ar4k.agent.logger.EdgeStaticLoggerBinder;

public class ReflectionUtils {

	private static final EdgeLogger logger = (EdgeLogger) EdgeStaticLoggerBinder.getSingleton().getLoggerFactory()
			.getLogger(ReflectionUtils.class.toString());

	private static ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();

	private ReflectionUtils() {
		throw new UnsupportedOperationException("Just for static usage");
	}

	public static String logThreadInfo() {
		final StringBuilder sb = new StringBuilder();
		final int STACK_DEPTH = 20;
		final boolean contention = threadBean.isThreadContentionMonitoringEnabled();
		final long[] threadIds = threadBean.getAllThreadIds();
		sb.append("Process Thread Dump for all the JVM \n");
		sb.append(threadIds.length + " active threads\n");
		for (final long tid : threadIds) {
			final ThreadInfo info = threadBean.getThreadInfo(tid, STACK_DEPTH);
			if (info == null) {
				sb.append("  Inactive");
				continue;
			}
			sb.append("Thread " + getTaskName(info.getThreadId(), info.getThreadName()) + ":\n");
			final Thread.State state = info.getThreadState();
			sb.append("  State: " + state + "\n");
			sb.append("  Blocked count: " + info.getBlockedCount() + "\n");
			sb.append("  Waited count: " + info.getWaitedCount() + "\n");
			if (contention) {
				sb.append("  Blocked time: " + info.getBlockedTime() + "\n");
				sb.append("  Waited time: " + info.getWaitedTime() + "\n");
			}
			if (state == Thread.State.WAITING) {
				sb.append("  Waiting on " + info.getLockName() + "\n");
			} else if (state == Thread.State.BLOCKED) {
				sb.append("  Blocked on " + info.getLockName() + "\n");
				sb.append("  Blocked by \n" + getTaskName(info.getLockOwnerId(), info.getLockOwnerName()));
			}
			sb.append("  Stack:\n");
			for (final StackTraceElement frame : info.getStackTrace()) {
				sb.append("    " + frame.toString() + "\n");
			}
		}
		logger.info(sb.toString());
		return sb.toString();
	}

	private static String getTaskName(long id, String name) {
		if (name == null) {
			return Long.toString(id);
		}
		return id + " (" + name + ")";
	}
}