package org.apache.maven.scm.plugin;

/*
 * 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.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.scm.ChangeSet;
import org.apache.maven.scm.ScmBranch;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmVersion;
import org.apache.maven.scm.command.changelog.ChangeLogScmRequest;
import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
import org.apache.maven.scm.command.changelog.ChangeLogSet;
import org.apache.maven.scm.provider.ScmProvider;
import org.apache.maven.scm.repository.ScmRepository;
import org.codehaus.plexus.util.StringUtils;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Dump changelog contents to console. It is mainly used to test maven-scm-api's changelog command.
 *
 * @author <a href="dantran@gmail.com">Dan Tran</a>
 * @author Olivier Lamy
 */
@Mojo( name = "changelog", aggregator = true )
public class ChangeLogMojo
    extends AbstractScmMojo
{

    private static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";

    /**
     * Start Date.
     */
    @Parameter( property = "startDate" )
    private String startDate;

    /**
     * End Date.
     */
    @Parameter( property = "endDate" )
    private String endDate;

    /**
     * Start Scm Version.
     */
    @Parameter( property = "startScmVersion" )
    private String startScmVersion;

    /**
     * End Scm Version.
     */
    @Parameter( property = "endScmVersion" )
    private String endScmVersion;

    /**
     * Start Scm Version Type.
     */
    @Parameter( property = "startScmVersionType" )
    private String startScmVersionType;

    /**
     * End Scm Version Type.
     */
    @Parameter( property = "endScmVersionType" )
    private String endScmVersionType;

    /**
     * Date Format in changelog output of scm tool.
     */
    @Parameter( property = "dateFormat" )
    private String dateFormat;

    /**
     * Date format to use for the specified startDate and/or endDate.
     */
    @Parameter( property = "userDateFormat", defaultValue = "yyyy-MM-dd" )
    private String userDateFormat = DEFAULT_DATE_FORMAT;

    /**
     * The version type (branch/tag) of scmVersion.
     */
    @Parameter( property = "scmVersionType" )
    private String scmVersionType;

    /**
     * The version (revision number/branch name/tag name).
     */
    @Parameter( property = "scmVersion" )
    private String scmVersion;

    /**
     * The branch name (TODO find out what this is for).
     */
    @Parameter( property = "scmBranch" )
    private String scmBranch;

    /**
     * The number of change log items to return.
     */
    @Parameter( property = "limit" )
    private Integer limit;

    /**
     * The number of days to look back for change log items to return.
     */
    @Parameter( property = "numDays" )
    private Integer numDays;

    /**
     * {@inheritDoc}
     */
    public void execute()
        throws MojoExecutionException
    {
        super.execute();

        SimpleDateFormat localFormat = new SimpleDateFormat( userDateFormat );

        try
        {
            ScmRepository repository = getScmRepository();

            ScmProvider provider = getScmManager().getProviderByRepository( repository );

            ChangeLogScmRequest request = new ChangeLogScmRequest( repository, getFileSet() );

            request.setDatePattern( dateFormat );

            if ( StringUtils.isNotEmpty( startDate ) )
            {
                request.setStartDate( parseDate( localFormat, startDate ) );
            }

            if ( StringUtils.isNotEmpty( endDate ) )
            {
                request.setEndDate( parseDate( localFormat, endDate ) );
            }

            if ( StringUtils.isNotEmpty( startScmVersion ) )
            {
                ScmVersion startRev =
                    getScmVersion( StringUtils.isEmpty( startScmVersionType ) ? VERSION_TYPE_REVISION
                        : startScmVersionType, startScmVersion );
                request.setStartRevision( startRev );
            }

            if ( StringUtils.isNotEmpty( endScmVersion ) )
            {
                ScmVersion endRev =
                    getScmVersion( StringUtils.isEmpty( endScmVersionType ) ? VERSION_TYPE_REVISION
                        : endScmVersionType, endScmVersion );
                request.setEndRevision( endRev );
            }

            request.setLimit( limit );

            if ( numDays != null )
            {
                request.setNumDays( numDays );
            }

            if ( StringUtils.isNotEmpty( scmVersion ) )
            {
                ScmVersion rev =
                    getScmVersion( StringUtils.isEmpty( scmVersionType ) ? VERSION_TYPE_REVISION
                        : scmVersionType, scmVersion );
                request.setRevision( rev );
            }

            if ( StringUtils.isNotEmpty( scmBranch ) )
            {
                request.setScmBranch( new ScmBranch( scmBranch ) );
            }

            ChangeLogScmResult result = provider.changeLog( request );

            checkResult( result );

            ChangeLogSet changeLogSet = result.getChangeLog();

            for ( ChangeSet changeSet : changeLogSet.getChangeSets() )
            {
                getLog().info( changeSet.toString() );
            }

        }
        catch ( IOException | ScmException e )
        {
            throw new MojoExecutionException( "Cannot run changelog command : ", e );
        }
    }

    /**
     * Converts the localized date string pattern to date object.
     *
     * @return A date
     */
    private Date parseDate( SimpleDateFormat format, String date )
        throws MojoExecutionException
    {
        if ( date == null || date.trim().length() == 0 )
        {
            return null;
        }

        try
        {
            return format.parse( date.toString() );
        }
        catch ( ParseException e )
        {
            throw new MojoExecutionException( "Please use this date pattern: " + format.toLocalizedPattern().toString(),
                                              e );
        }
    }
}