/*=============================================================================#
 # Copyright (c) 2009, 2018 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.rj.server.osgi;

import static org.eclipse.statet.rj.server.util.ServerUtils.RJ_SERVER_ID;

import java.io.IOException;
import java.net.URL;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.osgi.framework.Bundle;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;

import org.eclipse.statet.jcommons.collections.ImCollections;

import org.eclipse.statet.rj.RjInvalidConfigurationException;
import org.eclipse.statet.rj.server.util.RJContext;


/**
 * Server utilities when using the Eclipse Platform.
 */
public class ERJContext extends RJContext {
	
	
	private static void handle(final IStatus status) {
		Platform.getLog(Platform.getBundle(RJ_SERVER_ID)).log(status);
	}
	
	
	public ERJContext() {
	}
	
	
	/**
	 * Searches the specified RJ libraries in the Eclipse Platform installations
	 * <p>
	 * Uses always the os/arch currently running.</p>
	 * 
	 * @param libIds the bundle ids of the libraries
	 * @return the file paths of the found libraries
	 */
	@Override
	public List<String> searchRJLibs(final List<String> libIds) {
		final Set<String> resolved= new LinkedHashSet<>();
		for (final String libId : libIds) {
			final Bundle pluginBundle= Platform.getBundle(libId);
			if (pluginBundle != null) {
				addPath(pluginBundle, resolved);
				final Bundle[] fragments= Platform.getFragments(pluginBundle);
				if (fragments != null) {
					for (final Bundle fragmentBundle : fragments) {
						addPath(fragmentBundle, resolved);
					}
				}
			}
		}
		return ImCollections.toList(resolved);
	}
	
	private void addPath(final Bundle bundle, final Set<String> classpath) {
//		String location= bundle.getLocation();
//		if (location.startsWith("initial@")) {
//			location= location.substring(8);
//		}
//		if (location.startsWith("reference:file:")) { //$NON-NLS-1$
//			location= location.substring(15);
//			IPath path= new Path(location);
//			if (!path.isAbsolute()) {
//				path= new Path(Platform.getInstallLocation().getURL().getFile()).append(path);
//			}
//			String checked= path.lastSegment();
//			if (checked.contains("motif")) { //$NON-NLS-1$
//				checked= checked.replaceAll("motif", "gtk"); //$NON-NLS-1$ //$NON-NLS-2$
//			}
//			if (checked.contains("gtk")) { //$NON-NLS-1$
//				if (is64 && !checked.contains("64")) { //$NON-NLS-1$
//					checked= checked.replaceAll("x86", "x86_64"); //$NON-NLS-1$ //$NON-NLS-2$
//				}
//				if (!is64 && checked.contains("64")) { //$NON-NLS-1$
//					checked= checked.replaceAll("x86_64", "x86"); //$NON-NLS-1$ //$NON-NLS-2$
//				}
//			}
//			final String s= path.removeLastSegments(1).append(checked).makeAbsolute().toOSString();
//			if (location.endsWith("/")) { // //$NON-NLS-1$
//				if (Platform.inDevelopmentMode()) {
//					classpath.add(s+File.separatorChar+"bin"+File.separatorChar); //$NON-NLS-1$
//				}
//				classpath.add(s+File.separatorChar);
//			}
//			else {
//				classpath.add(s);
//			}
//			return;
//		}
		try {
			String s= FileLocator.resolve(bundle.getEntry("/")).toExternalForm();
			if (s.startsWith("jar:") && s.endsWith("!/")) {
				s= s.substring(4, s.length()-2);
			}
			if (s.startsWith("file:")) {
				s= s.substring(5);
			}
			if (Platform.inDevelopmentMode() && s.endsWith("/")) {
				classpath.add(s+"bin/");
			}
			classpath.add(s);
			return;
		}
		catch (final Exception e) {}
		handle(new Status(IStatus.WARNING, RJ_SERVER_ID, 
				"Unknown location for plug-in: '"+bundle.getBundleId()+"'. May cause fail to startup RJ (RMI/JRI)")); //$NON-NLS-1$ //$NON-NLS-2$
	}
	
	@Override
	public String getServerPolicyFilePath() throws RjInvalidConfigurationException {
		try {
			final Bundle bundle= Platform.getBundle(RJ_SERVER_ID);
			if (bundle == null) {
				throw new RjInvalidConfigurationException("RJ Server bundle ('"+RJ_SERVER_ID+"') is missing.");
			}
			final URL intern= bundle.getEntry("/localhost.policy"); 
			final URL java= FileLocator.resolve(intern);
			final String path= java.toExternalForm();
			return path;
		}
		catch (final IOException e) {
			throw new RjInvalidConfigurationException("Failed to resolve path to 'localhost.policy'.", e);
		}
	}
	
}