package org.apache.maven.scm.provider.local.command.checkin;

/*
 * 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 java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFile;
import org.apache.maven.scm.ScmFileSet;
import org.apache.maven.scm.ScmFileStatus;
import org.apache.maven.scm.ScmVersion;
import org.apache.maven.scm.command.checkin.AbstractCheckInCommand;
import org.apache.maven.scm.command.checkin.CheckInScmResult;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.scm.provider.local.command.LocalCommand;
import org.apache.maven.scm.provider.local.repository.LocalScmProviderRepository;
import org.apache.maven.scm.util.FilenameUtils;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.StringUtils;

/**
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 *
 */
public class LocalCheckInCommand
    extends AbstractCheckInCommand
    implements LocalCommand
{
    /** {@inheritDoc} */
    protected CheckInScmResult executeCheckInCommand( ScmProviderRepository repo, ScmFileSet fileSet, String message,
                                                      ScmVersion version )
        throws ScmException
    {
        LocalScmProviderRepository repository = (LocalScmProviderRepository) repo;

        if ( version != null && StringUtils.isNotEmpty( version.getName() ) )
        {
            throw new ScmException( "The local scm doesn't support tags." );
        }

        File root = new File( repository.getRoot() );

        String module = repository.getModule();

        File source = new File( root, module );

        File basedir = fileSet.getBasedir();

        if ( !basedir.exists() )
        {
            throw new ScmException(
                "The working directory doesn't exist (" + basedir.getAbsolutePath() + ")." );
        }

        if ( !root.exists() )
        {
            throw new ScmException( "The base directory doesn't exist (" + root.getAbsolutePath() + ")." );
        }

        if ( !source.exists() )
        {
            throw new ScmException( "The module directory doesn't exist (" + source.getAbsolutePath() + ")." );
        }

        List<ScmFile> checkedInFiles = new ArrayList<>();

        try
        {
            // Only copy files newer than in the repo
            File repoRoot = new File( repository.getRoot(), repository.getModule() );

            List<File> files = fileSet.getFileList();

            if ( files.isEmpty() )
            {
                files = FileUtils.getFiles( basedir, "**", null, false );
            }

            for ( File file : files )
            {
                String path = FilenameUtils.normalizeFilename( file.getPath() );
                File repoFile = new File( repoRoot, path );
                file = new File( basedir, path );

                ScmFileStatus status;

                if ( repoFile.exists() )
                {
                    String repoFileContents = FileUtils.fileRead( repoFile );

                    String fileContents = FileUtils.fileRead( file );

                    if ( logger.isDebugEnabled() )
                    {
                        logger.debug( "fileContents:" + fileContents );
                        logger.debug( "repoFileContents:" + repoFileContents );
                    }
                    if ( fileContents.equals( repoFileContents ) )
                    {
                        continue;
                    }

                    status = ScmFileStatus.CHECKED_IN;
                }
                else if ( repository.isFileAdded( path ) )
                {
                    status = ScmFileStatus.CHECKED_IN;
                }
                else
                {
                    if ( logger.isWarnEnabled() )
                    {
                        logger.warn( "skipped unknown file in checkin:" + path );
                    }
                    // unknown file, skip
                    continue;
                }

                FileUtils.copyFile( file, repoFile );
                ScmFile scmFile = new ScmFile( path, status );
                logger.info( scmFile.toString() );
                checkedInFiles.add( scmFile );
            }
        }
        catch ( IOException ex )
        {
            throw new ScmException( "Error while checking in the files.", ex );
        }

        return new CheckInScmResult( null, checkedInFiles );
    }
}
