package org.apache.archiva.consumers.core.repository;

/*
 * 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.
 */

import org.apache.archiva.common.utils.VersionComparator;
import org.apache.archiva.common.utils.VersionUtil;
import org.apache.archiva.metadata.repository.MetadataRepository;
import org.apache.archiva.metadata.repository.MetadataRepositoryException;
import org.apache.archiva.metadata.repository.RepositorySession;
import org.apache.archiva.model.ArtifactReference;
import org.apache.archiva.model.ProjectReference;
import org.apache.archiva.model.VersionedReference;
import org.apache.archiva.repository.ContentNotFoundException;
import org.apache.archiva.repository.LayoutException;
import org.apache.archiva.repository.ManagedRepositoryContent;
import org.apache.archiva.repository.ReleaseScheme;
import org.apache.archiva.repository.RepositoryException;
import org.apache.archiva.repository.RepositoryRegistry;
import org.apache.archiva.metadata.audit.RepositoryListener;
import org.apache.archiva.repository.metadata.base.MetadataTools;
import org.apache.archiva.repository.metadata.RepositoryMetadataException;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * <p>
 * This will look in a single managed repository, and purge any snapshots that are present
 * that have a corresponding released version on the same repository.
 * </p>
 * <p>
 * So, if you have the following (presented in the m2/default layout form) ...
 * <pre>
 *   /com/foo/foo-tool/1.0-SNAPSHOT/foo-tool-1.0-SNAPSHOT.jar
 *   /com/foo/foo-tool/1.1-SNAPSHOT/foo-tool-1.1-SNAPSHOT.jar
 *   /com/foo/foo-tool/1.2.1-SNAPSHOT/foo-tool-1.2.1-SNAPSHOT.jar
 *   /com/foo/foo-tool/1.2.1/foo-tool-1.2.1.jar
 *   /com/foo/foo-tool/2.0-SNAPSHOT/foo-tool-2.0-SNAPSHOT.jar
 *   /com/foo/foo-tool/2.0/foo-tool-2.0.jar
 *   /com/foo/foo-tool/2.1-SNAPSHOT/foo-tool-2.1-SNAPSHOT.jar
 * </pre>
 * then the current highest ranked released (non-snapshot) version is 2.0, which means
 * the snapshots from 1.0-SNAPSHOT, 1.1-SNAPSHOT, 1.2.1-SNAPSHOT, and 2.0-SNAPSHOT can
 * be purged.  Leaving 2.1-SNAPSHOT in alone.
 */
public class CleanupReleasedSnapshotsRepositoryPurge
    extends AbstractRepositoryPurge
{
    private MetadataTools metadataTools;

    private RepositoryRegistry repositoryRegistry;

    public CleanupReleasedSnapshotsRepositoryPurge( ManagedRepositoryContent repository, MetadataTools metadataTools,
                                                    RepositoryRegistry repositoryRegistry,
                                                    RepositorySession repositorySession,
                                                    List<RepositoryListener> listeners )
    {
        super( repository, repositorySession, listeners );
        this.metadataTools = metadataTools;
        this.repositoryRegistry = repositoryRegistry;
    }

    @Override
    public void process( String path )
        throws RepositoryPurgeException
    {
        try
        {
            Path artifactFile = Paths.get( repository.getRepoRoot( ), path );

            if ( !Files.exists(artifactFile) )
            {
                // Nothing to do here, file doesn't exist, skip it.
                return;
            }

            ArtifactReference artifactRef = repository.toArtifactReference( path );

            if ( !VersionUtil.isSnapshot( artifactRef.getVersion( ) ) )
            {
                // Nothing to do here, not a snapshot, skip it.
                return;
            }

            ProjectReference reference = new ProjectReference( );
            reference.setGroupId( artifactRef.getGroupId( ) );
            reference.setArtifactId( artifactRef.getArtifactId( ) );

            // Gether the released versions
            List<String> releasedVersions = new ArrayList<>( );

            Collection<org.apache.archiva.repository.ManagedRepository> repos = repositoryRegistry.getManagedRepositories( );
            for ( org.apache.archiva.repository.ManagedRepository repo : repos )
            {

                if ( repo.getActiveReleaseSchemes().contains( ReleaseScheme.RELEASE ))
                {
                    try
                    {
                        ManagedRepositoryContent repoContent = repo.getContent();
                        for ( String version : repoContent.getVersions( reference ) )
                        {
                            if ( !VersionUtil.isSnapshot( version ) )
                            {
                                releasedVersions.add( version );
                            }
                        }
                    }
                    catch ( RepositoryException e )
                    {
                        // swallow
                    }
                }
            }

            Collections.sort( releasedVersions, VersionComparator.getInstance( ) );

            // Now clean out any version that is earlier than the highest released version.
            boolean needsMetadataUpdate = false;

            VersionedReference versionRef = new VersionedReference( );
            versionRef.setGroupId( artifactRef.getGroupId( ) );
            versionRef.setArtifactId( artifactRef.getArtifactId( ) );

            MetadataRepository metadataRepository = repositorySession.getRepository( );

            if ( releasedVersions.contains( VersionUtil.getReleaseVersion( artifactRef.getVersion( ) ) ) )
            {
                versionRef.setVersion( artifactRef.getVersion( ) );
                repository.deleteVersion( versionRef );

                for ( RepositoryListener listener : listeners )
                {
                    listener.deleteArtifact( metadataRepository, repository.getId( ), artifactRef.getGroupId( ),
                        artifactRef.getArtifactId( ), artifactRef.getVersion( ),
                        artifactFile.getFileName().toString() );
                }
                metadataRepository.removeProjectVersion( repositorySession, repository.getId( ),
                    artifactRef.getGroupId( ), artifactRef.getArtifactId( ), artifactRef.getVersion( ) );

                needsMetadataUpdate = true;
            }

            if ( needsMetadataUpdate )
            {
                updateMetadata( artifactRef );
            }
        }
        catch ( LayoutException e )
        {
            log.debug( "Not processing file that is not an artifact: {}", e.getMessage( ) );
        }
        catch ( ContentNotFoundException e )
        {
            throw new RepositoryPurgeException( e.getMessage( ), e );
        }
        catch ( MetadataRepositoryException e )
        {
            log.error( "Could not remove metadata during cleanup of released snapshots of {}", path, e );
        }
        catch ( org.apache.archiva.repository.ContentAccessException e )
        {
            e.printStackTrace( );
        }
    }


    /*
     * TODO: Uses a deprecated API, but if we use the API with location string, it does not work as expected
     * -> not sure what needs to be changed here.
     */
    @SuppressWarnings( "deprecation" )
    private void updateMetadata( ArtifactReference artifact )
    {
        VersionedReference versionRef = new VersionedReference( );
        versionRef.setGroupId( artifact.getGroupId( ) );
        versionRef.setArtifactId( artifact.getArtifactId( ) );
        versionRef.setVersion( artifact.getVersion( ) );

        ProjectReference projectRef = new ProjectReference( );
        projectRef.setGroupId( artifact.getGroupId( ) );
        projectRef.setArtifactId( artifact.getArtifactId( ) );

        try
        {
            metadataTools.updateMetadata( repository, versionRef );
        }
        catch ( ContentNotFoundException e )
        {
            // Ignore. (Just means we have no snapshot versions left to reference).
        }
        catch ( RepositoryMetadataException e )
        {
            // Ignore.
        }
        catch ( IOException e )
        {
            // Ignore.
        }
        catch ( LayoutException e )
        {
            // Ignore.
        }

        try
        {
            metadataTools.updateMetadata( repository, projectRef );
        }
        catch ( ContentNotFoundException e )
        {
            // Ignore. (Just means we have no snapshot versions left to reference).
        }
        catch ( RepositoryMetadataException e )
        {
            // Ignore.
        }
        catch ( IOException e )
        {
            // Ignore.
        }
        catch ( LayoutException e )
        {
            // Ignore.
        }
    }
}