package org.apache.maven.plugins.dependency.utils;

/*
 * 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.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.ArtifactUtils;
import org.apache.maven.plugin.logging.Log;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.StringUtils;

/**
 * Utility class with static helper methods
 * 
 * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
 * @version $Id$
 */
public final class DependencyUtil
{

    /**
     * Builds the file name. If removeVersion is set, then the file name must be reconstructed from the artifactId,
     * Classifier (if used) and Type. Otherwise, this method returns the artifact file name.
     * 
     * @param artifact File to be formatted.
     * @param removeVersion Specifies if the version should be removed from the file name.
     * @return Formatted file name in the format artifactId-[version]-[classifier].[type]
     * @see #getFormattedFileName(Artifact, boolean, boolean)
     */
    public static String getFormattedFileName( Artifact artifact, boolean removeVersion )
    {
        return getFormattedFileName( artifact, removeVersion, false );
    }

    /**
     * Builds the file name. If removeVersion is set, then the file name must be reconstructed from the groupId (if
     * <b>prependGroupId</b> is true) artifactId, Classifier (if used) and Type. Otherwise, this method returns the
     * artifact file name.
     * 
     * @param artifact File to be formatted.
     * @param removeVersion Specifies if the version should be removed from the file name.
     * @param prependGroupId Specifies if the groupId should be prepended to the file name.
     * @return Formatted file name in the format [groupId].artifactId-[version]-[classifier].[type]
     */
    public static String getFormattedFileName( Artifact artifact, boolean removeVersion, boolean prependGroupId )
    {
        return getFormattedFileName( artifact, removeVersion, prependGroupId, false );
    }

    /**
     * Builds the file name. If removeVersion is set, then the file name must be reconstructed from the groupId (if
     * <b>prependGroupId</b> is true) artifactId, Classifier (if used) and Type. Otherwise, this method returns the
     * artifact file name.
     * 
     * @param artifact File to be formatted.
     * @param removeVersion Specifies if the version should be removed from the file name.
     * @param prependGroupId Specifies if the groupId should be prepended to the file name.
     * @param useBaseVersion Specifies if the baseVersion of the artifact should be used instead of the version.
     * @return Formatted file name in the format [groupId].artifactId-[version]-[classifier].[type]
     */
    public static String getFormattedFileName( Artifact artifact, boolean removeVersion, boolean prependGroupId,
                                               boolean useBaseVersion )
    {
        return getFormattedFileName( artifact, removeVersion, prependGroupId, useBaseVersion, false );
    }

    /**
     * Builds the file name. If removeVersion is set, then the file name must be reconstructed from the groupId (if
     * <b>prependGroupId</b> is true) artifactId, Classifier (if used) and Type. Otherwise, this method returns the
     * artifact file name.
     * 
     * @param artifact File to be formatted.
     * @param removeVersion Specifies if the version should be removed from the file name.
     * @param prependGroupId Specifies if the groupId should be prepended to the file name.
     * @param useBaseVersion Specifies if the baseVersion of the artifact should be used instead of the version.
     * @param removeClassifier Specifies if the classifier of the artifact should be remved from the file name.
     * @return Formatted file name in the format [groupId].artifactId-[version]-[classifier].[type]
     */
    public static String getFormattedFileName( Artifact artifact, boolean removeVersion, boolean prependGroupId,
                                               boolean useBaseVersion, boolean removeClassifier )
    {
        StringBuilder destFileName = new StringBuilder();

        if ( prependGroupId )
        {
            destFileName.append( artifact.getGroupId() ).append( "." );
        }

        String versionString;
        if ( !removeVersion )
        {
            if ( useBaseVersion )
            {
                versionString = "-" + ArtifactUtils.toSnapshotVersion( artifact.getVersion() );
            }
            else
            {
                versionString = "-" + artifact.getVersion();
            }
        }
        else
        {
            versionString = "";
        }

        String classifierString = "";

        if ( !removeClassifier && StringUtils.isNotEmpty( artifact.getClassifier() ) )
        {
            classifierString = "-" + artifact.getClassifier();
        }
        destFileName.append( artifact.getArtifactId() ).append( versionString );
        destFileName.append( classifierString ).append( "." );
        destFileName.append( artifact.getArtifactHandler().getExtension() );

        return destFileName.toString();
    }

    /**
     * Formats the outputDirectory based on type.
     * 
     * @param useSubdirsPerScope if a new sub directory should be used for each scope.
     * @param useSubdirsPerType if a new sub directory should be used for each type.
     * @param useSubdirPerArtifact if a new sub directory should be used for each artifact.
     * @param useRepositoryLayout if dependencies must be moved into a Maven repository layout, if set, other settings
     *            will be ignored.
     * @param removeVersion if the version must not be mentioned in the filename
     * @param outputDirectory base outputDirectory.
     * @param artifact information about the artifact.
     * @return a formatted File object to use for output.
     */
    public static File getFormattedOutputDirectory( boolean useSubdirsPerScope, boolean useSubdirsPerType,
                                                    boolean useSubdirPerArtifact, boolean useRepositoryLayout,
                                                    boolean removeVersion, File outputDirectory, Artifact artifact )
    {
        StringBuilder sb = new StringBuilder( 128 );
        if ( useRepositoryLayout )
        {
            // group id
            sb.append( artifact.getGroupId().replace( '.', File.separatorChar ) ).append( File.separatorChar );
            // artifact id
            sb.append( artifact.getArtifactId() ).append( File.separatorChar );
            // version
            sb.append( artifact.getBaseVersion() ).append( File.separatorChar );
        }
        else
        {
            if ( useSubdirsPerScope )
            {
                sb.append( artifact.getScope() ).append( File.separatorChar );
            }
            if ( useSubdirsPerType )
            {
                sb.append( artifact.getType() ).append( "s" ).append( File.separatorChar );
            }
            if ( useSubdirPerArtifact )
            {
                String artifactString = getDependencyId( artifact, removeVersion );
                sb.append( artifactString ).append( File.separatorChar );
            }
        }
        return new File( outputDirectory, sb.toString() );
    }

    private static String getDependencyId( Artifact artifact, boolean removeVersion )
    {
        StringBuilder sb = new StringBuilder();

        sb.append( artifact.getArtifactId() );

        if ( !removeVersion )
        {
            sb.append( "-" );
            sb.append( artifact.getVersion() );
        }

        if ( StringUtils.isNotEmpty( artifact.getClassifier() ) )
        {
            sb.append( "-" );
            sb.append( artifact.getClassifier() );
        }

        // if the classifier and type are the same (sources), then don't
        // repeat.
        // avoids names like foo-sources-sources
        if ( !StringUtils.equals( artifact.getClassifier(), artifact.getType() ) )
        {
            sb.append( "-" );
            sb.append( artifact.getType() );
        }

        return sb.toString();
    }

    /**
     * Writes the specified string to the specified file.
     * 
     * @param string the string to write
     * @param file the file to write to
     * @param append append to existing file or not.
     * @param log where to send the logging output.
     * @throws IOException if an I/O error occurs
     */
    public static synchronized void write( String string, File file, boolean append, Log log )
        throws IOException
    {
        file.getParentFile().mkdirs();

        FileWriter writer = null;

        try
        {
            writer = new FileWriter( file, append );

            writer.write( string );

            writer.close();
            writer = null;
        }
        finally
        {
            IOUtil.close( writer );
        }
    }

    /**
     * Writes the specified string to the log at info level.
     * 
     * @param string the string to write
     * @param log where to log information.
     * @throws IOException if an I/O error occurs
     */
    public static synchronized void log( String string, Log log )
        throws IOException
    {
        BufferedReader reader = new BufferedReader( new StringReader( string ) );

        String line;

        while ( ( line = reader.readLine() ) != null )
        {
            log.info( line );
        }

        reader.close();
    }

    /**
     * mainly used to parse excludes,includes configuration
     * @param str The string to be split.
     * @return The result items.
     */
    public static String[] tokenizer( String str )
    {
        return StringUtils.split( cleanToBeTokenizedString( str ), "," );
    }

    /**
     * clean up configuration string before it can be tokenized
     * @param str The str which should be cleaned.
     * @return cleaned up string.
     */
    public static String cleanToBeTokenizedString( String str )
    {
        String ret = "";
        if ( !StringUtils.isEmpty( str ) )
        {
            // remove initial and ending spaces, plus all spaces next to commas
            ret = str.trim().replaceAll( "[\\s]*,[\\s]*", "," );
        }

        return ret;
    }
}