/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.modules.maven;

import java.io.File;
import java.util.HashSet;
import java.util.Set;
import javax.swing.event.ChangeListener;
import org.apache.maven.artifact.Artifact;
import org.netbeans.modules.maven.api.NbMavenProject;
import org.netbeans.modules.maven.queries.MavenFileOwnerQueryImpl;
import org.netbeans.api.project.Project;
import org.netbeans.spi.project.DependencyProjectProvider;
import org.netbeans.spi.project.ProjectServiceProvider;
import org.openide.util.ChangeSupport;
import org.openide.util.Utilities;

/**
 * finds subprojects (projects this one depends on) that are locally available
 * and can be build as one unit. Uses maven multiproject infrastructure. (maven.multiproject.includes)
 * @author  Milos Kleint
 */
@ProjectServiceProvider(service=DependencyProjectProvider.class, projectType="org-netbeans-modules-maven")
public class DependencyProviderImpl2 implements DependencyProjectProvider {

    private final Project project;
    private final ChangeSupport chs = new ChangeSupport(this);

    public DependencyProviderImpl2(Project proj) {
        project = proj;
    }

    private void addKnownOwners(Set<Project> resultset) {
        Set<Artifact> artifacts = project.getLookup().lookup(NbMavenProject.class).getMavenProject().getArtifacts();
        for (Artifact ar : artifacts) {
            File f = ar.getFile();
            if (f != null) {
                Project p = MavenFileOwnerQueryImpl.getInstance().getOwner(Utilities.toURI(f));
                if (p == project) {
                    continue;
                }
                if (p != null) {
                    resultset.add(p);
                }
            }
        }
    }    

    //TODO 1. cache result
    //     2. listen to changes and fire change. Project + MFOQI
    @Override
    public Result getDependencyProjects() {
        Set<Project> projects = new HashSet<Project>();
        addKnownOwners(projects);
        return new Result(projects, true);
    }

    @Override
    public void addChangeListener(ChangeListener listener) {
        if (!chs.hasListeners()) {
            //attach listeners to changes.
        }
        chs.addChangeListener(listener);
    }

    @Override
    public void removeChangeListener(ChangeListener listener) {
        chs.removeChangeListener(listener);
        if (!chs.hasListeners()) {
            //detach listeners to changes.
        }
    }
}