/* *******************************************************************
 * Copyright (c) 2004,2010 Contributors
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     Matthew Webster, IBM
 * ******************************************************************/
package org.aspectj.weaver;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.IMessageHolder;
import org.aspectj.bridge.Version;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;
import org.aspectj.weaver.tools.Traceable;

/**
 * @author Matthew Webster
 */
public class Dump {

	public final static String DUMP_CONDITION_PROPERTY = "org.aspectj.weaver.Dump.condition";
	public final static String DUMP_DIRECTORY_PROPERTY = "org.aspectj.dump.directory";

	/* Format for unique filename based on date & time */
	private static final String FILENAME_PREFIX = "ajcore";
	// private static final DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
	// private static final DateFormat timeFormat = new SimpleDateFormat("HHmmss.SSS");
	private static final String FILENAME_SUFFIX = "txt";

	public static final String UNKNOWN_FILENAME = "Unknown";
	public static final String DUMP_EXCLUDED = "Excluded";
	public static final String NULL_OR_EMPTY = "Empty";

	private static Class<?> exceptionClass;
	private static IMessage.Kind conditionKind = IMessage.ABORT;
	private static File directory = new File(".");

	private String reason;
	private String fileName;
	private PrintStream print;

	private static String[] savedCommandLine;
	private static List<String> savedFullClasspath;
	private static IMessageHolder savedMessageHolder;

	// private static Map<INode, WeakReference<INode>> nodes = Collections
	// .synchronizedMap(new WeakHashMap<INode, WeakReference<INode>>());
	private static String lastDumpFileName = UNKNOWN_FILENAME;

	private static boolean preserveOnNextReset = false;

	private static Trace trace = TraceFactory.getTraceFactory().getTrace(Dump.class);

	/**
	 * for testing only, so that we can verify dump contents after compilation has completely finished
	 */
	public static void preserveOnNextReset() {
		preserveOnNextReset = true;
	}

	public static void reset() {
		if (preserveOnNextReset) {
			preserveOnNextReset = false;
			return;
		} else {
			// nodes.clear();
			savedMessageHolder = null;
		}
	}

	/*
	 * Dump methods
	 */
	public static String dump(String reason) {
		String fileName = UNKNOWN_FILENAME;
		Dump dump = null;
		try {
			dump = new Dump(reason);
			fileName = dump.getFileName();
			dump.dumpDefault();
		} finally {
			if (dump != null) {
				dump.close();
			}
		}
		return fileName;
	}

	public static String dumpWithException(Throwable th) {
		return dumpWithException(savedMessageHolder, th);
	}

	public static String dumpWithException(IMessageHolder messageHolder, Throwable th) {
		if (!getDumpOnException()) {
			return null;
		}
		if (trace.isTraceEnabled()) {
			trace.enter("dumpWithException", null, new Object[] { messageHolder, th });
		}

		String fileName = UNKNOWN_FILENAME;
		Dump dump = null;
		try {
			dump = new Dump(th.getClass().getName());
			fileName = dump.getFileName();
			dump.dumpException(messageHolder, th);
		} finally {
			if (dump != null) {
				dump.close();
			}
		}

		if (trace.isTraceEnabled()) {
			trace.exit("dumpWithException", fileName);
		}
		return fileName;
	}

	public static String dumpOnExit() {
		return dumpOnExit(savedMessageHolder, false);
	}

	public static String dumpOnExit(IMessageHolder messageHolder, boolean reset) {
		if (!getDumpOnException()) {
			return null;
		}
		if (trace.isTraceEnabled()) {
			trace.enter("dumpOnExit", null, messageHolder);
		}
		String fileName = UNKNOWN_FILENAME;

		if (!shouldDumpOnExit(messageHolder)) {
			fileName = DUMP_EXCLUDED;
		} else {
			Dump dump = null;
			try {
				dump = new Dump(conditionKind.toString());
				fileName = dump.getFileName();
				dump.dumpDefault(messageHolder);
			} finally {
				if (dump != null) {
					dump.close();
				}
			}
		}

		if (reset) {
			messageHolder.clearMessages();
		}

		if (trace.isTraceEnabled()) {
			trace.exit("dumpOnExit", fileName);
		}
		return fileName;
	}

	private static boolean shouldDumpOnExit(IMessageHolder messageHolder) {
		if (trace.isTraceEnabled()) {
			trace.enter("shouldDumpOnExit", null, messageHolder);
		}
		if (trace.isTraceEnabled()) {
			trace.event("shouldDumpOnExit", null, conditionKind);
		}
		boolean result = (messageHolder == null) || messageHolder.hasAnyMessage(conditionKind, true);

		if (trace.isTraceEnabled()) {
			trace.exit("shouldDumpOnExit", result);
		}
		return result;
	}

	/*
	 * Dump configuration
	 */
	public static void setDumpOnException(boolean b) {
		if (b) {
			exceptionClass = java.lang.Throwable.class;
		} else {
			exceptionClass = null;
		}
	}

	public static boolean setDumpDirectory(String directoryName) {
		if (trace.isTraceEnabled()) {
			trace.enter("setDumpDirectory", null, directoryName);
		}
		boolean success = false;

		File newDirectory = new File(directoryName);
		if (newDirectory.exists()) {
			directory = newDirectory;
			success = true;
		}

		if (trace.isTraceEnabled()) {
			trace.exit("setDumpDirectory", success);
		}
		return success;

	}

	public static boolean getDumpOnException() {
		return (exceptionClass != null);
	}

	public static boolean setDumpOnExit(IMessage.Kind condition) {
		if (trace.isTraceEnabled()) {
			trace.event("setDumpOnExit", null, condition);
		}

		conditionKind = condition;
		return true;
	}

	public static boolean setDumpOnExit(String condition) {
		for (IMessage.Kind kind : IMessage.KINDS) {
			if (kind.toString().equals(condition)) {
				return setDumpOnExit(kind);
			}
		}
		return false;
	}

	public static IMessage.Kind getDumpOnExit() {
		return conditionKind;
	}

	public static String getLastDumpFileName() {
		return lastDumpFileName;
	}

	public static void saveCommandLine(String[] args) {
		savedCommandLine = new String[args.length];
		System.arraycopy(args, 0, savedCommandLine, 0, args.length);
	}

	public static void saveFullClasspath(List<String> list) {
		savedFullClasspath = list;
	}

	public static void saveMessageHolder(IMessageHolder holder) {
		savedMessageHolder = holder;
	}

	// public static void registerNode(Class<?> module, INode newNode) {
	// if (trace.isTraceEnabled()) {
	// trace.enter("registerNode", null, new Object[] { module, newNode });
	// }
	//
	// // TODO surely this should preserve the module???? it never has....
	// nodes.put(newNode, new WeakReference<INode>(newNode));
	//
	// if (trace.isTraceEnabled()) {
	// trace.exit("registerNode", nodes.size());
	// }
	// }

	private Dump(String reason) {
		if (trace.isTraceEnabled()) {
			trace.enter("<init>", this, reason);
		}

		this.reason = reason;

		openDump();
		dumpAspectJProperties();
		dumpDumpConfiguration();

		if (trace.isTraceEnabled()) {
			trace.exit("<init>", this);
		}
	}

	public String getFileName() {
		return fileName;
	}

	private void dumpDefault() {
		dumpDefault(savedMessageHolder);
	}

	private void dumpDefault(IMessageHolder holder) {
		dumpSytemProperties();
		dumpCommandLine();
		dumpFullClasspath();
		dumpCompilerMessages(holder);

		// dumpNodes();
	}

	// private void dumpNodes() {
	//
	// IVisitor dumpVisitor = new IVisitor() {
	//
	// public void visitObject(Object obj) {
	// println(formatObj(obj));
	// }
	//
	// public void visitList(List list) {
	// println(list);
	// }
	// };
	//
	// Set<INode> keys = nodes.keySet();
	// for (INode dumpNode : keys) {
	// println("---- " + formatObj(dumpNode) + " ----");
	// try {
	// dumpNode.accept(dumpVisitor);
	// } catch (Exception ex) {
	// trace.error(formatObj(dumpNode).toString(), ex);
	// }
	// }
	// }

	private void dumpException(IMessageHolder messageHolder, Throwable th) {
		println("---- Exception Information ---");
		println(th);
		dumpDefault(messageHolder);
	}

	private void dumpAspectJProperties() {
		println("---- AspectJ Properties ---");
		println("AspectJ Compiler " + Version.getText() + " built on " + Version.getTimeText());
	}

	private void dumpDumpConfiguration() {
		println("---- Dump Properties ---");
		println("Dump file: " + fileName);
		println("Dump reason: " + reason);
		println("Dump on exception: " + (exceptionClass != null));
		println("Dump at exit condition: " + conditionKind);
	}

	private void dumpFullClasspath() {
		println("---- Full Classpath ---");
		if (savedFullClasspath != null && savedFullClasspath.size() > 0) {
			for (String fileName : savedFullClasspath) {
				File file = new File(fileName);
				println(file);
			}
		} else {
			println(NULL_OR_EMPTY);
		}
	}

	private void dumpSytemProperties() {
		println("---- System Properties ---");
		Properties props = System.getProperties();
		println(props);
	}

	private void dumpCommandLine() {
		println("---- Command Line ---");
		println(savedCommandLine);
	}

	private void dumpCompilerMessages(IMessageHolder messageHolder) {
		println("---- Compiler Messages ---");
		if (messageHolder != null) {
			for (Iterator<IMessage> i = messageHolder.getUnmodifiableListView().iterator(); i.hasNext();) {
				IMessage message = i.next();
				println(message.toString());
			}
		} else {
			println(NULL_OR_EMPTY);
		}
	}

	/*
	 * Dump output
	 */
	private void openDump() {
		if (print != null) {
			return;
		}

		Date now = new Date();
		fileName = FILENAME_PREFIX + "." + new SimpleDateFormat("yyyyMMdd").format(now) + "."
				+ new SimpleDateFormat("HHmmss.SSS").format(now) + "." + FILENAME_SUFFIX;
		try {
			File file = new File(directory, fileName);
			print = new PrintStream(new FileOutputStream(file), true);
			trace.info("Dumping to " + file.getAbsolutePath());
		} catch (Exception ex) {
			print = System.err;
			trace.info("Dumping to stderr");
			fileName = UNKNOWN_FILENAME;
		}

		lastDumpFileName = fileName;
	}

	public void close() {
		print.close();
	}

	private void println(Object obj) {
		print.println(obj);
	}

	private void println(Object[] array) {
		if (array == null) {
			println(NULL_OR_EMPTY);
			return;
		}

		for (int i = 0; i < array.length; i++) {
			print.println(array[i]);
		}
	}

	private void println(Properties props) {
		Iterator iter = props.keySet().iterator();
		while (iter.hasNext()) {
			String key = (String) iter.next();
			String value = props.getProperty(key);
			print.println(key + "=" + value);
		}
	}

	private void println(Throwable th) {
		th.printStackTrace(print);
	}

	private void println(File file) {
		print.print(file.getAbsolutePath());
		if (!file.exists()) {
			println("(missing)");
		} else if (file.isDirectory()) {
			int count = file.listFiles().length;
			println("(" + count + " entries)");
		} else {
			println("(" + file.length() + " bytes)");
		}
	}

	@SuppressWarnings("rawtypes")
	private void println(List list) {
		if (list == null || list.isEmpty()) {
			println(NULL_OR_EMPTY);
		} else {
			for (Iterator i = list.iterator(); i.hasNext();) {
				Object o = i.next();
				if (o instanceof Exception) {
					println((Exception) o);
				} else {
					println(o.toString());
				}
			}
		}
	}

	private static Object formatObj(Object obj) {

		/* These classes have a safe implementation of toString() */
		if (obj == null || obj instanceof String || obj instanceof Number || obj instanceof Boolean || obj instanceof Exception
				|| obj instanceof Character || obj instanceof Class || obj instanceof File || obj instanceof StringBuffer
				|| obj instanceof URL) {
			return obj;
		} else {
			try {

				/* Classes can provide an alternative implementation of toString() */
				if (obj instanceof Traceable) {
					Traceable t = (Traceable) obj;
					return t.toTraceString();
				} else {
					return obj.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(obj));
				}

				/* Object.hashCode() can be override and may thow an exception */
			} catch (Exception ex) {
				return obj.getClass().getName() + "@FFFFFFFF";
			}
		}
	}

	static {
		String exceptionName = System.getProperty("org.aspectj.weaver.Dump.exception", "true");
		if (!exceptionName.equals("false")) {
			setDumpOnException(true);
		}

		String conditionName = System.getProperty(DUMP_CONDITION_PROPERTY);
		if (conditionName != null) {
			setDumpOnExit(conditionName);
		}

		String directoryName = System.getProperty(DUMP_DIRECTORY_PROPERTY);
		if (directoryName != null) {
			setDumpDirectory(directoryName);
		}
	}

	public interface INode {

		public void accept(IVisitor visior);

	}

	public interface IVisitor {

		public void visitObject(Object s);

		public void visitList(List list);
	}

}