/* ==========================================================================
 * Copyright 2003-2004 Mevenide Team
 *
 * Licensed 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.nbm;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.factory.ArtifactFactory;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.apache.maven.artifact.resolver.ArtifactResolver;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.artifact.resolver.filter.ScopeArtifactFilter;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;
import org.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;
import org.apache.maven.shared.dependency.graph.DependencyNode;
import org.netbeans.nbm.model.Dependency;
import org.netbeans.nbm.model.NetBeansModule;
import org.netbeans.nbm.model.io.xpp3.NetBeansModuleXpp3Reader;
import org.netbeans.nbm.utils.AbstractNetbeansMojo;
import org.netbeans.nbm.utils.ExamineManifest;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;


import org.codehaus.plexus.util.IOUtil;

public abstract class AbstractNbmMojo
    extends AbstractNetbeansMojo
{

    static boolean matchesLibrary( Artifact artifact, List<String> libraries, ExamineManifest depExaminator,
        Log log, boolean useOsgiDependencies )
    {
        String artId = artifact.getArtifactId();
        String grId = artifact.getGroupId();
        String id = grId + ":" + artId;
        boolean explicit = libraries.remove( id );
        if ( explicit )
        {
            log.debug(
                id + " included as module library, explicitly declared in module descriptor." );
            return explicit;
        }
        if ( Artifact.SCOPE_PROVIDED.equals( artifact.getScope() ) || Artifact.SCOPE_SYSTEM.equals(
            artifact.getScope() ) )
        {
            log.debug(
                id + " omitted as module library, has scope 'provided/system'" );
            return false;
        }
        if ( "nbm".equals( artifact.getType() ) )
        {
            return false;
        }
        if ( depExaminator.isNetBeansModule() || ( useOsgiDependencies && depExaminator.isOsgiBundle() ) )
        {
            //TODO I can see how someone might want to include an osgi bundle as library, not dependency.
            // I guess it won't matter much in 6.9+, in older versions it could be a problem.
            return false;
        }
        log.debug(
            id + " included as module library, squeezed through all the filters." );
        return true;
    }

    static Dependency resolveNetBeansDependency( Artifact artifact, List<Dependency> deps,
        ExamineManifest manifest, Log log )
    {
        String artId = artifact.getArtifactId();
        String grId = artifact.getGroupId();
        String id = grId + ":" + artId;
        for ( Dependency dep : deps )
        {
            if ( id.equals( dep.getId() ) )
            {
                if ( manifest.isNetBeansModule() )
                {
                    return dep;
                }
                else
                {
                    if ( dep.getExplicitValue() != null )
                    {
                        return dep;
                    }
                    log.warn(
                        id + " declared as module dependency in descriptor, but not a NetBeans module" );
                    return null;
                }
            }
        }
        if ( "nbm".equals( artifact.getType() ) )
        {
            Dependency dep = new Dependency();
            dep.setId( id );
            dep.setType( "spec" );
            log.debug( "Adding nbm module dependency - " + id );
            return dep;
        }
        if ( manifest.isNetBeansModule() )
        {
            Dependency dep = new Dependency();
            dep.setId( id );
            dep.setType( "spec" );
            log.debug( "Adding direct NetBeans module dependency - " + id );
            return dep;
        }
        return null;
    }

    protected final NetBeansModule readModuleDescriptor( File descriptor )
        throws MojoExecutionException
    {
        if ( descriptor == null )
        {
            throw new MojoExecutionException(
                "The module descriptor has to be configured." );
        }
        if ( !descriptor.exists() )
        {
            throw new MojoExecutionException(
                "The module descriptor is missing: '" + descriptor + "'." );
        }
        Reader r = null;
        try
        {
            r = new FileReader( descriptor );
            NetBeansModuleXpp3Reader reader = new NetBeansModuleXpp3Reader();
            NetBeansModule module = reader.read( r );
            return module;
        }
        catch ( IOException exc )
        {
            throw new MojoExecutionException(
                "Error while reading module descriptor '" + descriptor + "'.",
                exc );
        }
        catch ( XmlPullParserException xml )
        {
            throw new MojoExecutionException(
                "Error while reading module descriptor '" + descriptor + "'.",
                xml );
        }
        finally
        {
            IOUtil.close( r );
        }
    }

    protected final NetBeansModule createDefaultDescriptor( MavenProject project, boolean log )
    {

        if ( log )
        {
            getLog().info(
                "No Module Descriptor defined, trying to fallback to generated values:" );
        }
        NetBeansModule module = new NetBeansModule();
        return module;
    }

    static List<Artifact> getLibraryArtifacts( DependencyNode treeRoot, NetBeansModule module,
                                               List<Artifact> runtimeArtifacts,
                                               Map<Artifact, ExamineManifest> examinerCache, Log log,
                                               boolean useOsgiDependencies )
        throws MojoExecutionException
    {
        List<Artifact> include = new ArrayList<Artifact>();
        if ( module != null )
        {
            List<String> librList = new ArrayList<String>();
            if ( module.getLibraries() != null )
            {
                librList.addAll( module.getLibraries() );
            }
            CollectLibrariesNodeVisitor visitor = new CollectLibrariesNodeVisitor( librList,
                runtimeArtifacts, examinerCache, log, treeRoot, useOsgiDependencies );
            treeRoot.accept( visitor );
            include.addAll( visitor.getArtifacts() );
        }
        return include;
    }

    static List<ModuleWrapper> getModuleDependencyArtifacts( DependencyNode treeRoot, NetBeansModule module,
                                                             Dependency[] customDependencies, MavenProject project,
                                                             Map<Artifact, ExamineManifest> examinerCache,
                                                             List<Artifact> libraryArtifacts, Log log,
                                                             boolean useOsgiDependencies )
        throws MojoExecutionException
    {
        List<Dependency> deps = new ArrayList<Dependency>();
        if (customDependencies != null) {
            deps.addAll( Arrays.asList( customDependencies ));
        }
        if (module != null && !module.getDependencies().isEmpty()) {
            log.warn( "dependencies in module descriptor are deprecated, use the plugin's parameter moduleDependencies");
            //we need to make sure a dependency is not twice there, module deps override the config (as is the case with other
            //configurations)
            for (Dependency d : module.getDependencies()) {
                Dependency found = null;
                for (Dependency d2 : deps) {
                    if (d2.getId().equals(d.getId())) {
                        found = d2;
                        break;
                    }
                }
                if (found != null) {
                    deps.remove( found );
                }
                deps.add(d);
            }
        }
        List<ModuleWrapper> include = new ArrayList<ModuleWrapper>();
        
            @SuppressWarnings( "unchecked" )
            List<Artifact> artifacts = project.getCompileArtifacts();
            for ( Artifact artifact : artifacts )
            {
                if ( libraryArtifacts.contains( artifact ) )
                {
                    continue;
                }
                ExamineManifest depExaminator = examinerCache.get( artifact );
                if ( depExaminator == null )
                {
                    depExaminator = new ExamineManifest( log );
                    depExaminator.setArtifactFile( artifact.getFile() );
                    depExaminator.checkFile();
                    examinerCache.put( artifact, depExaminator );
                }
                Dependency dep = resolveNetBeansDependency( artifact, deps, depExaminator, log );
                if ( dep != null )
                {
                    ModuleWrapper wr = new ModuleWrapper();
                    wr.dependency = dep;
                    wr.artifact = artifact;
                    wr.transitive = false;
                    //only direct deps matter to us..
                    if ( depExaminator.isNetBeansModule() && artifact.getDependencyTrail().size() > 2 )
                    {
                        log.debug(
                            artifact.getId() + " omitted as NetBeans module dependency, not a direct one. Declare it in the pom for inclusion." );
                        wr.transitive = true;

                    }
                    include.add( wr );
                }
                else
                {
                    if ( useOsgiDependencies && depExaminator.isOsgiBundle() )
                    {
                        ModuleWrapper wr = new ModuleWrapper();
                        wr.osgi = true;
                        String id = artifact.getGroupId() + ":" + artifact.getArtifactId();
                        for ( Dependency depe : deps )
                        {
                            if ( id.equals( depe.getId() ) )
                            {
                                wr.dependency = depe;
                            }
                        }
                        boolean print = false;
                        if ( wr.dependency == null )
                        {
                            Dependency depe = new Dependency();
                            depe.setId( id );
                            depe.setType( "spec" );
                            wr.dependency = depe;
                            print = true;
                        }

                        wr.artifact = artifact;
                        wr.transitive = false;
                        //only direct deps matter to us..
                        if ( artifact.getDependencyTrail().size() > 2 )
                        {
                            log.debug(
                                artifact.getId() + " omitted as NetBeans module OSGi dependency, not a direct one. Declare it in the pom for inclusion." );
                            wr.transitive = true;

                        }
                        else
                        {
                            if ( print )
                            {
                                log.info( "Adding OSGi bundle dependency - " + id );
                            }
                        }

                        include.add( wr );
                    }
                }
            }
        return include;
    }

    static class ModuleWrapper
    {

        Dependency dependency;

        Artifact artifact;

        boolean transitive = true;
        
        boolean osgi = false;

    }

    //copied from dependency:tree mojo
    protected DependencyNode createDependencyTree( MavenProject project, DependencyGraphBuilder dependencyGraphBuilder,
                                                   String scope )
        throws MojoExecutionException
    {
        ArtifactFilter artifactFilter = createResolvingArtifactFilter( scope );
        try
        {
            return dependencyGraphBuilder.buildDependencyGraph( project, artifactFilter );
        }
        catch ( DependencyGraphBuilderException exception )
        {
            throw new MojoExecutionException( "Cannot build project dependency tree", exception );
        }

    }

    //copied from dependency:tree mojo
    /**
     * Gets the artifact filter to use when resolving the dependency tree.
     *
     * @return the artifact filter
     */
    private ArtifactFilter createResolvingArtifactFilter( String scope )
    {
        ArtifactFilter filter;

        // filter scope
        if ( scope != null )
        {
            getLog().debug( "+ Resolving dependency tree for scope '" + scope + "'" );

            filter = new ScopeArtifactFilter( scope );
        }
        else
        {
            filter = null;
        }

        return filter;
    }

    protected final ArtifactResult turnJarToNbmFile( Artifact art, ArtifactFactory artifactFactory,
                                                     ArtifactResolver artifactResolver, MavenProject project,
                                                     ArtifactRepository localRepository )
        throws MojoExecutionException
    {
        if ( "jar".equals( art.getType() ) || "nbm".equals( art.getType() ) )
        {
            //TODO, it would be nice to have a check to see if the
            // "to-be-created" module nbm artifact is actually already in the
            // list of dependencies (as "nbm-file") or not..
            // that would be a timesaver
            ExamineManifest mnf = new ExamineManifest( getLog() );
            File jar = art.getFile();
            if ( !jar.isFile() )
            {
                //MNBMODULE-210 with recent CoS changes in netbeans (7.4) jar will be file as we link open projects in the build
                // via WorkspaceReader. That's fine here, as all we need is to know if project is osgi or nbm module.
                // the nbm file has to be in local repository though.
                String path = localRepository.pathOf( art );
                File jar2 = new File(localRepository.getBasedir(), path.replace( "/", File.separator));
                File manifest = new File(jar, "META-INF/MANIFEST.MF" );
                
                if (! jar2.isFile() || !manifest.isFile() ) {
                    getLog().warn( "MNBMODULE-131: need to at least run install phase on " + jar2 );
                    return new ArtifactResult( null, null );
                }
                mnf.setManifestFile( manifest );
            } else {
                mnf.setJarFile( jar );
            }
            mnf.checkFile();
            if ( mnf.isNetBeansModule() )
            {
                Artifact nbmArt = artifactFactory.createDependencyArtifact(
                    art.getGroupId(),
                    art.getArtifactId(),
                    art.getVersionRange(),
                    "nbm-file",
                    art.getClassifier(),
                    art.getScope() );
                try
                {
                    artifactResolver.resolve( nbmArt, project.getRemoteArtifactRepositories(), localRepository );
                }

                catch ( ArtifactResolutionException ex )
                {
                    //shall be check before actually resolving from repos?
                    checkReactor( art, nbmArt );
                    if ( !nbmArt.isResolved() )
                    {
                        throw new MojoExecutionException( "Failed to retrieve the nbm file from repository", ex );
                    }
                }
                catch ( ArtifactNotFoundException ex )
                {
                    //shall be check before actually resolving from repos?
                    checkReactor( art, nbmArt );
                    if ( !nbmArt.isResolved() )
                    {
                        throw new MojoExecutionException( "Failed to retrieve the nbm file from repository", ex );
                    }
                }
                return new ArtifactResult( nbmArt, mnf );
            }
            if ( mnf.isOsgiBundle() )
            {
                return new ArtifactResult( null, mnf );
            }
        }
        return new ArtifactResult( null, null );
    }

    protected static final class ArtifactResult
    {
        private final Artifact converted;
        private final ExamineManifest manifest;

        ArtifactResult( Artifact conv, ExamineManifest manifest )
        {
            converted = conv;
            this.manifest = manifest;
        }

        boolean hasConvertedArtifact()
        {
            return converted != null;
        }

        Artifact getConvertedArtifact()
        {
            return converted;
        }

        public boolean isOSGiBundle()
        {
            return manifest != null && manifest.isOsgiBundle();
        }

        public ExamineManifest getExaminedManifest()
        {
            return manifest;
        }
    }

    private void checkReactor( Artifact art, Artifact nbmArt )
    {
        if ( art.getFile().getName().endsWith( ".jar" ) )
        {
            String name = art.getFile().getName();
            name = name.substring( 0, name.length() - ".jar".length() ) + ".nbm";
            File fl = new File( art.getFile().getParentFile(), name );
            if ( fl.exists() )
            {
                nbmArt.setFile( fl );
                nbmArt.setResolved( true );
            }
        }
    }

}