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/*******************************************************************************
 * Copyright (c) 2010 itemis AG (http://www.itemis.eu) 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
 *******************************************************************************/
package org.eclipse.xtext.mwe;

import java.util.List;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.xtext.resource.IResourceDescriptions;
import org.eclipse.xtext.resource.IResourceServiceProvider;
import org.eclipse.xtext.resource.containers.DelegatingIAllContainerAdapter;
import org.eclipse.xtext.resource.containers.IAllContainersState;

import com.google.common.base.Predicate;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
import com.google.inject.Inject;
import com.google.inject.Provider;

public class RuntimeResourceSetInitializer {

	@Inject
	private Provider resourceSetProvider;
	@Inject
	private ResourceDescriptionsProvider provider;
	@Inject
	private ContainersStateFactory factory;
	@Inject
	private PathTraverser traverser;
	@Inject
	private IResourceServiceProvider.Registry registry;

	public List getClassPathEntries() {
		List pathes = Lists.newArrayList();
		String classPath = System.getProperty("java.class.path");
		String separator = System.getProperty("path.separator");
		String[] strings = classPath.split(separator);
		for (String path : strings) {
			pathes.add(path);
		}
		return pathes;
	}

	protected Multimap getPathToUriMap(List pathes) {
		return getPathToUriMap(pathes, null);
	}
	
	protected Multimap getPathToUriMap(List pathes, final UriFilter filter) {
		return traverser.resolvePathes(pathes, new Predicate() {
			public boolean apply(URI input) {
				boolean result = true;
				if (filter != null)
					result = filter.matches(input);
				if (result)
					result = registry.getResourceServiceProvider(input) != null;
				return result;
			}
		});
	}

	public ResourceSet getInitializedResourceSet(List pathes) {
		return getInitializedResourceSet(pathes, null);
	}
	
	public ResourceSet getInitializedResourceSet(List pathes, UriFilter filter) {
		ResourceSet resourceSet = resourceSetProvider.get();
		Multimap pathToUriMap = getPathToUriMap(pathes, filter);
		IAllContainersState containersState = factory.getContainersState(pathes, pathToUriMap);
		resourceSet.eAdapters().add(new DelegatingIAllContainerAdapter(containersState));
		for (URI uri : pathToUriMap.values()) {
			resourceSet.createResource(uri);
		}
		return resourceSet;
	}

	public IResourceDescriptions getDescriptions(ResourceSet resourceSet) {
		return provider.get(resourceSet);
	}

}