package org.codehaus.plexus.compiler;

/**
 * The MIT License
 *
 * Copyright (c) 2005, The Codehaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.codehaus.plexus.util.DirectoryScanner;

import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
 * @author <a href="mailto:michal.maczka@dimatics.com">Michal Maczka </a>
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 */
public abstract class AbstractCompiler
    extends AbstractLogEnabled
    implements Compiler
{
    protected static final String EOL = System.getProperty( "line.separator" );

    protected static final String PS = System.getProperty( "path.separator" );

    private CompilerOutputStyle compilerOutputStyle;

    private String inputFileEnding;

    private String outputFileEnding;

    private String outputFile;

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    protected AbstractCompiler( CompilerOutputStyle compilerOutputStyle, String inputFileEnding,
                                String outputFileEnding, String outputFile )
    {
        this.compilerOutputStyle = compilerOutputStyle;

        this.inputFileEnding = inputFileEnding;

        this.outputFileEnding = outputFileEnding;

        this.outputFile = outputFile;
    }

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    public CompilerResult performCompile(CompilerConfiguration configuration)
            throws CompilerException 
    {
        throw new CompilerNotImplementedException("The performCompile method has not been implemented.");
    }

    @Deprecated
    public List<CompilerError> compile(CompilerConfiguration configuration)
            throws CompilerException
    {
        throw new CompilerNotImplementedException("The compile method has not been implemented.");
    }

    public CompilerOutputStyle getCompilerOutputStyle()
    {
        return compilerOutputStyle;
    }

    public String getInputFileEnding( CompilerConfiguration configuration )
        throws CompilerException
    {
        return inputFileEnding;
    }

    public String getOutputFileEnding( CompilerConfiguration configuration )
        throws CompilerException
    {
        if ( compilerOutputStyle != CompilerOutputStyle.ONE_OUTPUT_FILE_PER_INPUT_FILE )
        {
            throw new RuntimeException( "This compiler implementation doesn't have one output file per input file." );
        }

        return outputFileEnding;
    }

    public String getOutputFile( CompilerConfiguration configuration )
        throws CompilerException
    {
        if ( compilerOutputStyle != CompilerOutputStyle.ONE_OUTPUT_FILE_FOR_ALL_INPUT_FILES )
        {
            throw new RuntimeException( "This compiler implementation doesn't have one output file for all files." );
        }

        return outputFile;
    }

    public boolean canUpdateTarget( CompilerConfiguration configuration )
        throws CompilerException
    {
        return true;
    }

    // ----------------------------------------------------------------------
    // Utility Methods
    // ----------------------------------------------------------------------

    public static String getPathString( List<String> pathElements )
    {
        StringBuilder sb = new StringBuilder();

        for ( String pathElement : pathElements )
        {
            sb.append( pathElement ).append( File.pathSeparator );
        }

        return sb.toString();
    }

    protected static Set<String> getSourceFilesForSourceRoot( CompilerConfiguration config, String sourceLocation )
    {
        DirectoryScanner scanner = new DirectoryScanner();

        scanner.setBasedir( sourceLocation );

        Set<String> includes = config.getIncludes();

        if ( includes != null && !includes.isEmpty() )
        {
            String[] inclStrs = includes.toArray( new String[includes.size()] );
            scanner.setIncludes( inclStrs );
        }
        else
        {
            scanner.setIncludes( new String[]{ "**/*.java" } );
        }

        Set<String> excludes = config.getExcludes();

        if ( excludes != null && !excludes.isEmpty() )
        {
            String[] exclStrs = excludes.toArray( new String[excludes.size()] );
            scanner.setExcludes( exclStrs );
        }

        scanner.scan();

        String[] sourceDirectorySources = scanner.getIncludedFiles();

        Set<String> sources = new HashSet<String>();

        for ( String sourceDirectorySource : sourceDirectorySources )
        {
            File f = new File( sourceLocation, sourceDirectorySource );

            sources.add( f.getPath() );
        }

        return sources;
    }

    protected static String[] getSourceFiles( CompilerConfiguration config )
    {
        Set<String> sources = new HashSet<String>();

        Set<File> sourceFiles = config.getSourceFiles();

        if ( sourceFiles != null && !sourceFiles.isEmpty() )
        {
            for ( File sourceFile : sourceFiles )
            {
                sources.add( sourceFile.getAbsolutePath() );
            }
        }
        else
        {
            for ( String sourceLocation : config.getSourceLocations() )
            {
                sources.addAll( getSourceFilesForSourceRoot( config, sourceLocation ) );
            }
        }

        String[] result;

        if ( sources.isEmpty() )
        {
            result = new String[0];
        }
        else
        {
            result = sources.toArray( new String[sources.size()] );
        }

        return result;
    }

    protected static String makeClassName( String fileName, String sourceDir )
        throws CompilerException
    {
        File origFile = new File( fileName );

        String canonical = null;

        if ( origFile.exists() )
        {
            canonical = getCanonicalPath( origFile ).replace( '\\', '/' );
        }

        if ( sourceDir != null )
        {
            String prefix = getCanonicalPath( new File( sourceDir ) ).replace( '\\', '/' );

            if ( canonical != null )
            {
                if ( canonical.startsWith( prefix ) )
                {
                    String result = canonical.substring( prefix.length() + 1, canonical.length() - 5 );

                    result = result.replace( '/', '.' );

                    return result;
                }
            }
            else
            {
                File t = new File( sourceDir, fileName );

                if ( t.exists() )
                {
                    String str = getCanonicalPath( t ).replace( '\\', '/' );

                    return str.substring( prefix.length() + 1, str.length() - 5 ).replace( '/', '.' );
                }
            }
        }

        if ( fileName.endsWith( ".java" ) )
        {
            fileName = fileName.substring( 0, fileName.length() - 5 );
        }

        fileName = fileName.replace( '\\', '.' );

        return fileName.replace( '/', '.' );
    }

    private static String getCanonicalPath( File origFile )
        throws CompilerException
    {
        try
        {
            return origFile.getCanonicalPath();
        }
        catch ( IOException e )
        {
            throw new CompilerException(
                "Error while getting the canonical path of '" + origFile.getAbsolutePath() + "'.", e );
        }
    }

    /**
     * @deprecated use (String[]) arguments.toArray( new String[ arguments.size() ] ); instead
     */
    protected static String[] toStringArray( List<String> arguments )
    {
        String[] args = new String[arguments.size()];

        int argLength = arguments.size();

        for ( int i = 0; i < argLength; i++ )
        {
            args[i] = arguments.get( i );
        }

        return args;
    }
}
