/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. and others.
 *
 * 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.jsp.core.el;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;

/**
 * @author mengbo
 */
public class LoadBundleUtil {

	private LoadBundleUtil() {

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.IAction#run()
	 */
	public static IStorage getLoadBundleResource(IProject project,
			String baseName) throws CoreException {
		if (project == null || baseName == null) {
			return null;
		}
		IStorage loadBundleResource = null;
		if (project.hasNature(JavaCore.NATURE_ID)) {
			IJavaProject javaProject = JavaCore.create(project);
			IFile sourceFile = getSourceFile(javaProject, baseName);
			if (sourceFile == null || !sourceFile.exists()) {
				loadBundleResource = getJarFile(javaProject, baseName);
			} else {
				loadBundleResource = sourceFile;
			}
		}

		return loadBundleResource;
	}

	private static IFile getSourceFile(IJavaProject javaProject, String baseName)
			throws JavaModelException {
		IClasspathEntry[] classpathEntries = javaProject.getRawClasspath();
		for (int i = 0; i < classpathEntries.length; i++) {
			if (classpathEntries[i].getEntryKind() == IClasspathEntry.CPE_SOURCE) {
				IPath path = classpathEntries[i].getPath().append(
						getFilePath(baseName)).removeFirstSegments(1);
				path = javaProject.getProject().getFullPath().append(path);
				IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(
						path);
				if (file.exists()) {
					return file;
				}
			}
		}
		return null;
	}

	private static IPath getFilePath(String baseName) {
		IPath path = new Path(baseName.replace('.', '/'));//$NON-NLS-1$
		path = path.addFileExtension("properties");//$NON-NLS-1$
		return path;
	}

	private static IStorage getJarFile(IJavaProject javaProject, String baseName)
			throws JavaModelException {
		IClasspathEntry[] roots = javaProject.getRawClasspath();
		for (int i = 0; i < roots.length; i++) {
			if (roots[i].getEntryKind() != IClasspathEntry.CPE_LIBRARY) {
				continue;
			}

			IPackageFragmentRoot[] packageFragmentRoots = javaProject
					.findPackageFragmentRoots(roots[i]);
			for (int j = 0; j < packageFragmentRoots.length; j++) {
				String packageName = getPackageName(baseName);
				Object[] resources = null;
				if (packageName.length() == 0) {
					resources = packageFragmentRoots[j].getNonJavaResources();
				} else {
					IPackageFragment fragment = packageFragmentRoots[j]
							.getPackageFragment(getPackageName(baseName));
					if (fragment != null && fragment.exists()) {
						resources = fragment.getNonJavaResources();
					}
				}

				if (resources != null && resources.length > 0) {
					for (int k = 0; k < resources.length; k++) {
						if (resources[k] instanceof IStorage) {
							IStorage storage = (IStorage) resources[k];
							if (getFileName(baseName).equalsIgnoreCase(
									storage.getName())) {
								return storage;
							}
						}
					}
				}
			}
		}
		return null;
	}

	private static String getPackageName(String baseName) {
		int index = baseName.lastIndexOf('.');//$NON-NLS-1$
		if (index == -1) {
			return "";//$NON-NLS-1$
		} else {
			return baseName.substring(0, index);
		}
	}

	private static String getFileName(String baseName) {
		int index = baseName.lastIndexOf('.');//$NON-NLS-1$
		if (index == -1) {
			return baseName + ".properties";
		} else {
			return baseName.substring(index + 1).concat(".properties");//$NON-NLS-1$
		}
	}

}