package org.apache.maven.profiles;

/*
 * 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.profiles.io.xpp3.ProfilesXpp3Reader;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.interpolation.EnvarBasedValueSource;
import org.codehaus.plexus.interpolation.RegexBasedInterpolator;
import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.ReaderFactory;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;

@Deprecated
@Component( role = MavenProfilesBuilder.class )
public class DefaultMavenProfilesBuilder
    extends AbstractLogEnabled
    implements MavenProfilesBuilder
{
    private static final String PROFILES_XML_FILE = "profiles.xml";

    public ProfilesRoot buildProfiles( File basedir )
        throws IOException, XmlPullParserException
    {
        File profilesXml = new File( basedir, PROFILES_XML_FILE );

        ProfilesRoot profilesRoot = null;

        if ( profilesXml.exists() )
        {
            ProfilesXpp3Reader reader = new ProfilesXpp3Reader();
            Reader profileReader = null;
            try
            {
                profileReader = ReaderFactory.newXmlReader( profilesXml );

                StringWriter sWriter = new StringWriter();

                IOUtil.copy( profileReader, sWriter );

                String rawInput = sWriter.toString();

                try
                {
                    RegexBasedInterpolator interpolator = new RegexBasedInterpolator();
                    interpolator.addValueSource( new EnvarBasedValueSource() );

                    rawInput = interpolator.interpolate( rawInput, "settings" );
                }
                catch ( Exception e )
                {
                    getLogger().warn( "Failed to initialize environment variable resolver. Skipping environment "
                                          + "substitution in " + PROFILES_XML_FILE + "." );
                    getLogger().debug( "Failed to initialize envar resolver. Skipping resolution.", e );
                }

                StringReader sReader = new StringReader( rawInput );

                profilesRoot = reader.read( sReader );
            }
            finally
            {
                IOUtil.close( profileReader );
            }
        }

        return profilesRoot;
    }

}
