package org.apache.maven.scm.command.changelog;

/*
 * 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.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.apache.maven.scm.ChangeSet;
import org.apache.maven.scm.ScmVersion;

/**
 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
 *
 */
public class ChangeLogSet
{
    public static final String DEFAULT_ENCODING = "ISO-8859-1";

    private List<ChangeSet> entries;

    private Date startDate;

    private Date endDate;

    private ScmVersion startVersion;

    private ScmVersion endVersion;

    /**
     * Initializes a new instance of this class.
     *
     * @param startDate the start date/tag for this set.
     * @param endDate   the end date/tag for this set, or <code>null</code> if this set goes to the present time.
     */
    public ChangeLogSet( Date startDate, Date endDate )
    {
        this.startDate = startDate;
        this.endDate = endDate;
    }

    /**
     * Initializes a new instance of this class.
     *
     * @param entries   collection of {@link org.apache.maven.scm.ChangeSet} objects for this set.
     * @param startDate the start date/tag for this set.
     * @param endDate   the end date/tag for this set, or <code>null</code> if this set goes to the present time.
     */
    public ChangeLogSet( List<ChangeSet> entries, Date startDate, Date endDate )
    {
        this( startDate, endDate );
        setChangeSets( entries );
    }

    /**
     * Returns the start date.
     *
     * @return the start date.
     */
    public Date getStartDate()
    {
        return startDate;
    }

    /**
     * Returns the end date for this set.
     *
     * @return the end date for this set, or <code>null</code> if this set goes to the present time.
     */
    public Date getEndDate()
    {
        return endDate;
    }

    /**
     * Returns the start version (revision/branch/label) for this set.
     *
     * @return the start version (revision/branch/label) for this set, or <code>null</code>.
     */
    public ScmVersion getStartVersion()
    {
        return startVersion;
    }

    public void setStartVersion( ScmVersion startVersion )
    {
        this.startVersion = startVersion;
    }

    /**
     * Returns the end version (revision/branch/label) for this set.
     *
     * @return the end version (revision/branch/label) for this set, or <code>null</code>.
     */
    public ScmVersion getEndVersion()
    {
        return endVersion;
    }

    public void setEndVersion( ScmVersion endVersion )
    {
        this.endVersion = endVersion;
    }

    /**
     * Returns the collection of changeSet.
     *
     * @return the collection of {@link org.apache.maven.scm.ChangeSet} objects for this set.
     */
    public List<ChangeSet> getChangeSets()
    {
        return entries;
    }

    public void setChangeSets( List<ChangeSet> changeSets )
    {
        this.entries = changeSets;
    }

    /**
     * Creates an XML representation of this change log set with a default encoding (ISO-8859-1).
     *
     * @return TODO
     */
    public String toXML()
    {
        return toXML( DEFAULT_ENCODING );
    }

    /**
     * Creates an XML representation of this change log set.
     *
     * @param encoding encoding of output
     * @return TODO
     */
    public String toXML( String encoding )
    {
        String encodingString = encoding;

        if ( encodingString == null )
        {
            encodingString = DEFAULT_ENCODING;
        }

        StringBuilder buffer = new StringBuilder();
        String pattern = "yyyyMMdd HH:mm:ss z";
        SimpleDateFormat formatter = new SimpleDateFormat( pattern );

        buffer.append( "<?xml version=\"1.0\" encoding=\"" + encodingString + "\"?>\n" );
        buffer.append( "<changeset datePattern=\"" )
            .append( pattern )
            .append( "\"" );

        if ( startDate != null )
        {
            buffer.append( " start=\"" )
                .append( formatter.format( getStartDate() ) )
                .append( "\"" );
        }
        if ( endDate != null )
        {
            buffer.append( " end=\"" )
                .append( formatter.format( getEndDate() ) )
                .append( "\"" );
        }

        if ( startVersion != null )
        {
            buffer.append( " startVersion=\"" )
                .append( getStartVersion() )
                .append( "\"" );
        }
        if ( endVersion != null )
        {
            buffer.append( " endVersion=\"" )
                .append( getEndVersion() )
                .append( "\"" );
        }

        buffer.append( ">\n" );

        //  Write out the entries
        for ( ChangeSet changeSet : getChangeSets() )
        {
            buffer.append( changeSet.toXML() );
        }

        buffer.append( "</changeset>\n" );

        return buffer.toString();
    }
}
