/*******************************************************************************
 * Copyright (c) 2000, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.ccvs.core;


import java.io.PrintStream;
import java.lang.reflect.Field;

import org.eclipse.core.runtime.*;
import org.eclipse.osgi.service.debug.DebugOptions;
import org.eclipse.osgi.service.debug.DebugOptionsListener;
import org.eclipse.team.internal.core.InfiniteSubProgressMonitor;

public class Policy {
	public static PrintStream recorder;
	
	//debug constants
	public static boolean DEBUG = false;
	public static boolean DEBUG_METAFILE_CHANGES = false;
	public static boolean DEBUG_CVS_PROTOCOL = false;
	public static boolean DEBUG_THREADING = false;
	public static boolean DEBUG_DIRTY_CACHING = false;
	public static boolean DEBUG_SYNC_CHANGE_EVENTS = false;

	static final DebugOptionsListener DEBUG_OPTIONS_LISTENER = new DebugOptionsListener() {
		public void optionsChanged(DebugOptions options) {
			DEBUG = options.getBooleanOption(CVSProviderPlugin.ID + "/debug", false); //$NON-NLS-1$
			DEBUG_METAFILE_CHANGES = DEBUG && options.getBooleanOption(CVSProviderPlugin.ID + "/metafiles", false); //$NON-NLS-1$
			DEBUG_CVS_PROTOCOL = DEBUG && options.getBooleanOption(CVSProviderPlugin.ID + "/cvsprotocol", false); //$NON-NLS-1$
			DEBUG_THREADING = DEBUG && options.getBooleanOption(CVSProviderPlugin.ID + "/threading", false); //$NON-NLS-1$
			DEBUG_DIRTY_CACHING = DEBUG && options.getBooleanOption(CVSProviderPlugin.ID + "/dirtycaching", false); //$NON-NLS-1$
			DEBUG_SYNC_CHANGE_EVENTS = DEBUG && options.getBooleanOption(CVSProviderPlugin.ID + "/syncchangeevents", false); //$NON-NLS-1$
		}
	};

	/**
	 * Progress monitor helpers
	 */
	public static void checkCanceled(IProgressMonitor monitor) {
		if (monitor.isCanceled())
			throw new OperationCanceledException();
	}
	public static IProgressMonitor monitorFor(IProgressMonitor monitor) {
		if (monitor == null)
			return new NullProgressMonitor();
		return monitor;
	}	
	
	public static IProgressMonitor subMonitorFor(IProgressMonitor monitor, int ticks) {
		if (monitor == null)
			return new NullProgressMonitor();
		if (monitor instanceof NullProgressMonitor)
			return monitor;
		return SubMonitor.convert(monitor, ticks);
	}
	
	public static IProgressMonitor infiniteSubMonitorFor(IProgressMonitor monitor, int ticks) {
		if (monitor == null)
			return new NullProgressMonitor();
		if (monitor instanceof NullProgressMonitor)
			return monitor;
		return new InfiniteSubProgressMonitor(monitor, ticks);
	}
	
	public static boolean isDebugProtocol() {
		return DEBUG_CVS_PROTOCOL || recorder != null;
	}
	
	public static void printProtocolLine(String line) {
		printProtocol(line, true);
	}

	public static void printProtocol(String string, boolean newLine) {
		if (DEBUG_CVS_PROTOCOL) {
			System.out.print(string);
			if (newLine) {
				System.out.println();
			}
		}
		if (recorder != null) {
			recorder.print(string);
			if (newLine) {
				recorder.println();
			}
		}
	}
	
	public static String getMessage(String key) {
		try {
			Field f = CVSMessages.class.getDeclaredField(key);
			Object o = f.get(null);
			if (o instanceof String)
				return (String)o;
		} catch (SecurityException e) {
		} catch (NoSuchFieldException e) {
		} catch (IllegalArgumentException e) {
		} catch (IllegalAccessException e) {
		}
		return null;
	}
}