package org.apache.maven.plugin.eclipse.writers;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * Licensed 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.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.eclipse.Messages;
import org.apache.maven.plugin.ide.IdeDependency;
import org.apache.maven.plugin.ide.IdeUtils;
import org.codehaus.plexus.util.StringUtils;
import org.codehaus.plexus.util.xml.XMLWriter;

/**
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 * @author <a href="mailto:kenney@neonics.com">Kenney Westerhof</a>
 * @author <a href="mailto:fgiust@users.sourceforge.net">Fabrizio Giustina</a>
 * @version $Id: EclipseSettingsWriter.java 424062 2006-07-20 21:04:59Z fgiust $
 */
public class EclipseAjdtWriter
    extends AbstractEclipseWriter
{

    /**
     * 
     */
    private static final String LIBRARY = "LIBRARY";

    /**
     * 
     */
    private static final String BINARY = "BINARY";

    /**
     * 
     */
    private static final String CONTENT_KIND = ".contentKind";

    /**
     * 
     */
    private static final String ENTRY_KIND = ".entryKind";

    private static final String FILE_AJDT_PREFS = "org.eclipse.ajdt.ui.prefs"; //$NON-NLS-1$

    private static final String PROP_ECLIPSE_PREFERENCES_VERSION = "eclipse.preferences.version"; //$NON-NLS-1$

    private static final String DIR_DOT_SETTINGS = ".settings"; //$NON-NLS-1$
    
    private static final String AJDT_PROP_PREFIX = "org.eclipse.ajdt.ui."; //$NON-NLS-1$
    
    private static final String ASPECT_DEP_PROP = "aspectPath";
    
    private static final String WEAVE_DEP_PROP = "inPath";
    
    /**
     * @see org.apache.maven.plugin.eclipse.writers.EclipseWriter#write()
     */
    public void write()
        throws MojoExecutionException
    {

        // check if it's necessary to create project specific settings
        Properties ajdtSettings = new Properties();

        IdeDependency[] aspectjDeps = config.getAspectjDeps();
        for ( int i = 0 ; i < aspectjDeps.length ; i++ )
        {
            addDependency( ajdtSettings, aspectjDeps[ i ], ASPECT_DEP_PROP, i + 1 );
        }

        IdeDependency[] weaveDeps = config.getAjdtWeaveDeps();
        for ( int i = 0 ; i < weaveDeps.length ; i++ )
        {
            addDependency( ajdtSettings, weaveDeps[ i ], WEAVE_DEP_PROP, i + 1 );
        }
        
        // write the settings, if needed
        if ( !ajdtSettings.isEmpty() )
        {
            File settingsDir = new File( config.getEclipseProjectDirectory(), DIR_DOT_SETTINGS ); //$NON-NLS-1$

            settingsDir.mkdirs();

            ajdtSettings.put( PROP_ECLIPSE_PREFERENCES_VERSION, "1" ); //$NON-NLS-1$ 

            try
            {
                File oldAjdtSettingsFile;

                File ajdtSettingsFile = new File( settingsDir, FILE_AJDT_PREFS );

                if ( ajdtSettingsFile.exists() )
                {
                    oldAjdtSettingsFile = ajdtSettingsFile;

                    Properties oldsettings = new Properties();
                    oldsettings.load( new FileInputStream( oldAjdtSettingsFile ) );

                    Properties newsettings = (Properties) oldsettings.clone();
                    newsettings.putAll( ajdtSettings );

                    if ( !oldsettings.equals( newsettings ) )
                    {
                        newsettings.store( new FileOutputStream( ajdtSettingsFile ), null );
                    }
                }
                else
                {
                    ajdtSettings.store( new FileOutputStream( ajdtSettingsFile ), null );

                    log.info( Messages.getString( "EclipseSettingsWriter.wrotesettings", //$NON-NLS-1$
                                                  ajdtSettingsFile.getCanonicalPath() ) );
                }
            }
            catch ( FileNotFoundException e )
            {
                throw new MojoExecutionException( Messages.getString( "EclipseSettingsWriter.cannotcreatesettings" ), e ); //$NON-NLS-1$
            }
            catch ( IOException e )
            {
                throw new MojoExecutionException( Messages.getString( "EclipseSettingsWriter.errorwritingsettings" ), e ); //$NON-NLS-1$
            }
        }
    }

    private void addDependency( Properties ajdtSettings, IdeDependency dep, String propName, int index )
        throws MojoExecutionException
    {

        String path;

        if ( dep.isReferencedProject() && !config.isPde() )
        {
            path = "/" + dep.getArtifactId(); //$NON-NLS-1$
        }
        else
        {
            File artifactPath = dep.getFile();
            if ( artifactPath == null )
            {
                log.error( Messages.getString( "EclipsePlugin.artifactpathisnull", dep.getId() ) ); //$NON-NLS-1$
                return;
            }

            path = IdeUtils.toRelativeAndFixSeparator( config.getEclipseProjectDirectory(), artifactPath, false );
        }

        ajdtSettings.setProperty( AJDT_PROP_PREFIX + propName + CONTENT_KIND + index, BINARY );
        ajdtSettings.setProperty( AJDT_PROP_PREFIX + propName + ENTRY_KIND + index, LIBRARY );
        ajdtSettings.setProperty( AJDT_PROP_PREFIX + propName + index, path );
    }
}