/*******************************************************************************
 *  Copyright (c) 2010, 2011 Oracle. 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: 
 *  	Oracle - initial API and implementation
 *******************************************************************************/
package org.eclipse.jpt.jaxb.core.internal.libval;

import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jpt.common.core.internal.libval.LibValUtil;
import org.eclipse.jpt.common.core.libprov.JptLibraryProviderInstallOperationConfig;
import org.eclipse.jpt.common.core.libval.LibraryValidator;
import org.eclipse.jpt.common.utility.internal.iterables.TransformationIterable;
import org.eclipse.jpt.jaxb.core.JaxbFacet;
import org.eclipse.jpt.jaxb.core.JptJaxbCorePlugin;
import org.eclipse.jpt.jaxb.core.internal.JptJaxbCoreMessages;
import org.eclipse.jpt.jaxb.core.internal.libprov.JaxbUserLibraryProviderInstallOperationConfig;
import org.eclipse.osgi.util.NLS;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;

public class GenericJaxbUserLibraryValidator
		implements LibraryValidator {
	
	public synchronized IStatus validate(JptLibraryProviderInstallOperationConfig config) {
		
		JaxbUserLibraryProviderInstallOperationConfig jaxbConfig 
				= (JaxbUserLibraryProviderInstallOperationConfig) config;
		
		IProjectFacetVersion jaxbVersion = config.getProjectFacetVersion();
		IProjectFacetVersion javaVersion = JaxbLibValUtil.getJavaVersion(jaxbConfig);
		IProjectFacetVersion javaJaxbVersion = JaxbLibValUtil.findJavaJaxbVersion(jaxbConfig);
		
		Iterable<IPath> libraryPaths = 
				new TransformationIterable<IClasspathEntry, IPath>(jaxbConfig.resolve()) {
					@Override
					protected IPath transform(IClasspathEntry o) {
						return o.getPath();
					}
				};
		
		// dev-time portion of validation - error if actual java library *conflicts with* jaxb facet
		// or if library does not provide supplemental classes
		
		IProjectFacetVersion jreJaxbVersion = JaxbLibValUtil.findJreJaxbVersion(jaxbConfig);
		
		// null here implies something prior to jaxb 2.1
		if (jreJaxbVersion != null) {
			if (jreJaxbVersion.compareTo(jaxbVersion) < 0) {
				String message = NLS.bind(
						JptJaxbCoreMessages.UserLibraryValidator_incompatibleJavaLibrary,
						new String[] {jaxbVersion.getVersionString()});
				return new Status(IStatus.ERROR, JptJaxbCorePlugin.PLUGIN_ID, message);
			}
		}
		// if jre is enough for jaxb version, we don't look for classes in the library
		else {
			Set<String> classNames = new HashSet<String>();
	
			classNames.add("javax.xml.bind.annotation.XmlSeeAlso"); //$NON-NLS-1$
			if (jaxbVersion.compareTo(JaxbFacet.VERSION_2_2) >= 0) {
				classNames.add("javax.xml.bind.JAXBPermission"); //$NON-NLS-1$
			}
			
			IStatus status = LibValUtil.validate(libraryPaths, classNames);
			
			if (! status.isOK()) {
				return status;
			}
		}
		
		// runtime portion of validation - warn if java facet is insufficient to provide jaxb api.
		// user may override implementation manually, however
		// assume 1.6 runtime environs are latest (with jaxb 2.1, not 2.0)
		
		// null here implies something prior to jaxb 2.1
		if (javaJaxbVersion != null && javaJaxbVersion.compareTo(jaxbVersion) < 0) {
			String message = NLS.bind(
					JptJaxbCoreMessages.UserLibraryValidator_incompatibleJavaFacet,
					new String[] {javaVersion.getVersionString(), jaxbVersion.getVersionString()});
			return new Status(IStatus.WARNING, JptJaxbCorePlugin.PLUGIN_ID, message);
		}
		
		return Status.OK_STATUS;
	}
}