package org.apache.continuum.purge.executor;

/*
 * 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.commons.io.FileUtils;
import org.apache.commons.io.comparator.LastModifiedFileComparator;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.apache.continuum.purge.ContinuumPurgeConstants;
import org.apache.maven.archiva.consumers.core.repository.ArtifactFilenameFilter;

import java.io.File;
import java.io.FileFilter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.Arrays;

/**
 * @author Maria Catherine Tan
 */
public class RetentionCountDirectoryPurgeExecutor
    extends AbstractContinuumPurgeExecutor
    implements ContinuumPurgeExecutor
{
    private final int retentionCount;

    private final String directoryType;

    public RetentionCountDirectoryPurgeExecutor( int retentionCount, String directoryType )
    {
        this.retentionCount = retentionCount;

        this.directoryType = directoryType;
    }

    public void purge( String path )
        throws ContinuumPurgeExecutorException
    {
        if ( directoryType.equals( ContinuumPurgeConstants.PURGE_DIRECTORY_RELEASES ) )
        {
            purgeReleaseDirectory( path );
        }
        else if ( directoryType.equals( ContinuumPurgeConstants.PURGE_DIRECTORY_BUILDOUTPUT ) )
        {
            purgeBuildOutputDirectory( path );
        }
    }

    private void purgeReleaseDirectory( String path )
    {
        File releaseDir = new File( path );

        FilenameFilter filter = new ArtifactFilenameFilter( "releases-" );

        File[] files = releaseDir.listFiles( filter );

        if ( retentionCount > files.length )
        {
            return;
        }

        Arrays.sort( files, LastModifiedFileComparator.LASTMODIFIED_COMPARATOR );

        int countToPurge = files.length - retentionCount;

        for ( File file : files )
        {
            if ( countToPurge <= 0 )
            {
                break;
            }

            try
            {
                FileUtils.deleteDirectory( file );
                countToPurge--;
            }
            catch ( IOException e )
            {
                //throw new ContinuumPurgeExecutorException( "Error while purging release directories", e );
            }
        }
    }

    private void purgeBuildOutputDirectory( String path )
    {
        File buildOutputDir = new File( path );

        FileFilter filter = DirectoryFileFilter.DIRECTORY;

        File[] projectsDir = buildOutputDir.listFiles( filter );

        for ( File projectDir : projectsDir )
        {
            File[] buildsDir = projectDir.listFiles( filter );

            if ( retentionCount > buildsDir.length )
            {
                continue;
            }

            Arrays.sort( buildsDir, LastModifiedFileComparator.LASTMODIFIED_COMPARATOR );

            int countToPurge = buildsDir.length - retentionCount;

            for ( File buildDir : buildsDir )
            {
                if ( countToPurge-- <= 0 )
                {
                    break;
                }

                try
                {
                    FileUtils.deleteDirectory( buildDir );
                    File logFile = new File( buildDir.getAbsoluteFile() + ".log.txt" );

                    if ( logFile.exists() )
                    {
                        logFile.delete();
                    }
                }
                catch ( IOException e )
                {
                    //swallow?
                }
            }
        }
    }
}