Copyright (c) 2006, 2017 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
/*******************************************************************************
 * Copyright (c) 2006, 2017 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.osgi.internal.log;

import java.io.File;
import java.io.Writer;
import java.util.Dictionary;
import java.util.Hashtable;
import org.eclipse.core.runtime.adaptor.EclipseStarter;
import org.eclipse.osgi.framework.log.FrameworkLog;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.internal.framework.EquinoxConfiguration;
import org.eclipse.osgi.service.datalocation.Location;
import org.eclipse.osgi.storage.StorageUtil;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.log.LogLevel;
import org.osgi.service.log.admin.LoggerContext;

public class EquinoxLogServices {
	static final String EQUINOX_LOGGER_NAME = "org.eclipse.equinox.logger"; //$NON-NLS-1$
	static final String PERF_LOGGER_NAME = "org.eclipse.performance.logger"; //$NON-NLS-1$
	private static final String PROP_LOG_ENABLED = "eclipse.log.enabled"; //$NON-NLS-1$

	// The eclipse log file extension */
	private static final String LOG_EXT = ".log"; //$NON-NLS-1$
	private final LogServiceManager logServiceManager;
	private final EquinoxLogFactory eclipseLogFactory;
	private final EquinoxLogWriter logWriter;
	private final EquinoxLogWriter perfWriter;
	private final FrameworkLog rootFrameworkLog;

	public EquinoxLogServices(EquinoxConfiguration environmentInfo) {
		Location configuration = environmentInfo.getEquinoxLocations().getConfigurationLocation();
		String logFilePath = environmentInfo.getConfiguration(EclipseStarter.PROP_LOGFILE);
		if (logFilePath == null) {
			logFilePath = Long.toString(System.currentTimeMillis()) + EquinoxLogServices.LOG_EXT;
		}

		File logFile = new File(logFilePath);
		if (!logFile.isAbsolute()) {
			File configAreaDirectory = null;
			if (configuration != null)
				// TODO assumes the URL is a file: url
				configAreaDirectory = new File(configuration.getURL().getPath());

			if (configAreaDirectory != null) {
				logFile = new File(configAreaDirectory, logFilePath);
			} else {
				logFile = null;

			}
		}

		boolean enabled = "true".equals(environmentInfo.getConfiguration(PROP_LOG_ENABLED, "true")); //$NON-NLS-1$ //$NON-NLS-2$
		if (logFile != null) {
			environmentInfo.setConfiguration(EclipseStarter.PROP_LOGFILE, logFile.getAbsolutePath());
			logWriter = new EquinoxLogWriter(logFile, EQUINOX_LOGGER_NAME, enabled, environmentInfo);

			File perfLogFile = new File(logFile.getParentFile(), "performance.log"); //$NON-NLS-1$
			perfWriter = new EquinoxLogWriter(perfLogFile, PERF_LOGGER_NAME, true, environmentInfo);
		} else {
			logWriter = new EquinoxLogWriter((Writer) null, EQUINOX_LOGGER_NAME, enabled, environmentInfo);
			perfWriter = new EquinoxLogWriter((Writer) null, PERF_LOGGER_NAME, true, environmentInfo);
		}

		if ("true".equals(environmentInfo.getConfiguration(EclipseStarter.PROP_CONSOLE_LOG))) //$NON-NLS-1$
			logWriter.setConsoleLog(true);
		String logHistoryMaxProp = environmentInfo.getConfiguration(EquinoxConfiguration.PROP_LOG_HISTORY_MAX);
		int logHistoryMax = 0;
		if (logHistoryMaxProp != null) {
			try {
				logHistoryMax = Integer.parseInt(logHistoryMaxProp);
			} catch (NumberFormatException e) {
				// ignore and use 0
			}
		}

		LogLevel defaultLevel = LogLevel.WARN;
		try {
			String defaultLevelConfig = environmentInfo.getConfiguration(LoggerContext.LOGGER_CONTEXT_DEFAULT_LOGLEVEL);
			if (defaultLevelConfig != null) {
				defaultLevel = LogLevel.valueOf(defaultLevelConfig);
			}
		} catch (IllegalArgumentException e) {
			//ignore and use LogLevel.WARN
		}

		logServiceManager = new LogServiceManager(logHistoryMax, defaultLevel, logWriter, perfWriter);
		eclipseLogFactory = new EquinoxLogFactory(logWriter, logServiceManager);
		rootFrameworkLog = eclipseLogFactory.createFrameworkLog(null, logWriter);

		logWriter.setLoggerAdmin(logServiceManager.getLoggerAdmin());
		perfWriter.setLoggerAdmin(logServiceManager.getLoggerAdmin());
	}

	private ServiceRegistration<?> frameworkLogReg;
	private ServiceRegistration<?> perfLogReg;

	
Throws:
BundleException – /**
	 * @throws BundleException  
	 */
	public void start(BundleContext context) throws BundleException {
		logServiceManager.start(context);
		frameworkLogReg = StorageUtil.register(FrameworkLog.class.getName(), eclipseLogFactory, context);
		perfLogReg = registerPerformanceLog(context);
	}

	
Throws:
BundleException – /**
	 * @throws BundleException  
	 */
	public void stop(BundleContext context) throws BundleException {
		frameworkLogReg.unregister();
		perfLogReg.unregister();
		logServiceManager.stop(context);
	}

	public FrameworkLog getFrameworkLog() {
		return rootFrameworkLog;
	}

	private ServiceRegistration<?> registerPerformanceLog(BundleContext context) {
		Object service = createPerformanceLog(context.getBundle());
		String serviceName = FrameworkLog.class.getName();
		Dictionary<String, Object> serviceProperties = new Hashtable<>();

		serviceProperties.put(Constants.SERVICE_RANKING, Integer.valueOf(Integer.MIN_VALUE));
		serviceProperties.put(Constants.SERVICE_PID, context.getBundle().getBundleId() + '.' + service.getClass().getName());
		serviceProperties.put(FrameworkLog.SERVICE_PERFORMANCE, Boolean.TRUE.toString());

		return context.registerService(serviceName, service, serviceProperties);
	}

	private FrameworkLog createPerformanceLog(Bundle systemBundle) {
		return eclipseLogFactory.createFrameworkLog(systemBundle, perfWriter);
	}

	public void log(String entry, int severity, String message, Throwable throwable) {
		log(entry, severity, message, throwable, null);
	}

	public void log(String entry, int severity, String message, Throwable throwable, FrameworkLogEntry[] children) {
		getFrameworkLog().log(new FrameworkLogEntry(entry, severity, 0, message, 0, throwable, children));
	}
}