package org.apache.maven.plugin.nar;

/*
 * 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.File;
import java.io.IOException;
import java.util.Arrays;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.codehaus.plexus.util.FileUtils;

/**
 * Copies the GNU style source files to a target area, autogens and configures them.
 * 
 * @goal nar-gnu-configure
 * @phase process-sources
 * @requiresProject
 * @author Mark Donszelmann
 */
public class NarGnuConfigureMojo
    extends AbstractGnuMojo
{
    /**
     * Skip running of autogen.sh (aka buildconf).
     * 
     * @parameter expression="${nar.gnu.autogen.skip}" default-value="false"
     */
    private boolean gnuAutogenSkip;

    /**
     * Skip running of configure and therefore also autogen.sh
     * 
     * @parameter expression="${nar.gnu.configure.skip}" default-value="false"
     */
    private boolean gnuConfigureSkip;

    /**
     * Arguments to pass to GNU configure.
     * 
     * @parameter expression="${nar.gnu.configure.args}" default-value=""
     */
    private String gnuConfigureArgs;

    /**
     * Arguments to pass to GNU buildconf.
     * 
     * @parameter expression="${nar.gnu.buildconf.args}" default-value=""
     */
    private String gnuBuildconfArgs;

    private static final String AUTOGEN = "autogen.sh";

    private static final String BUILDCONF = "buildconf";

    private static final String CONFIGURE = "configure";

    public final void narExecute()
        throws MojoExecutionException, MojoFailureException
    {

        if ( !useGnu() )
        {
            return;
        }

        File targetDir = getGnuAOLSourceDirectory();
        if ( getGnuSourceDirectory().exists() )
        {
            getLog().info( "Copying GNU sources" );

            try
            {
                FileUtils.mkdir( targetDir.getPath() );
                NarUtil.copyDirectoryStructure( getGnuSourceDirectory(), targetDir, null, null );
            }
            catch ( IOException e )
            {
                throw new MojoExecutionException( "Failed to copy GNU sources", e );
            }

            if ( !gnuConfigureSkip && !gnuAutogenSkip )
            {
                File autogen = new File( targetDir, AUTOGEN );
                File buildconf = new File( targetDir, BUILDCONF );
                if ( autogen.exists() )
                {
                    getLog().info( "Running GNU " + AUTOGEN );
                    runAutogen(autogen, targetDir, null);
                } else if ( buildconf.exists() ) {
                    getLog().info( "Running GNU " + BUILDCONF );
                    String gnuBuildconfArgsArray[] = null;
                    if (gnuBuildconfArgs != null)
                    {
                        gnuBuildconfArgsArray = gnuBuildconfArgs.split("\\s");
                    }
                    runAutogen(buildconf, targetDir, gnuBuildconfArgsArray);
                }
            }

            File configure = new File( targetDir, CONFIGURE );
            if ( !gnuConfigureSkip && configure.exists() )
            {
                getLog().info( "Running GNU " + CONFIGURE );

                NarUtil.makeExecutable( configure, getLog() );
                String[] args = null;

                // create the array to hold constant and additional args
                if ( gnuConfigureArgs != null )
                {
                    String[] a = gnuConfigureArgs.split( " " );
                    args = new String[a.length + 2];

                    for ( int i = 0; i < a.length; i++ )
                    {
                        args[i+2] = a[i];
                    }
                }
                else
                {
                    args = new String[2];
                }

                //first 2 args are constant
                args[0] = "./" + configure.getName();
                args[1] = "--prefix=" + getGnuAOLTargetDirectory().getAbsolutePath();

                getLog().info( "args: " + Arrays.toString(args) );
                int result = NarUtil.runCommand( "sh", args, targetDir, null, getLog() );
                if ( result != 0 )
                {
                    throw new MojoExecutionException( "'" + CONFIGURE + "' errorcode: " + result );
                }
            }
        }
    }

    private void runAutogen(final File autogen, final File targetDir, final String args[])
        throws MojoExecutionException, MojoFailureException
    {
        // fix missing config directory
        final File configDir = new File(targetDir, "config");
        if (!configDir.exists()) {
            configDir.mkdirs();
        }

        NarUtil.makeExecutable( autogen, getLog() );
        getLog().debug("running sh ./" + autogen.getName());

        String arguments[] = null;
        if (args != null)
        {
            arguments = new String[1 + args.length];
            for (int i = 0; i < args.length; ++i)
            {
                arguments[i+1] = args[i];
            }
        }
        else
        {
            arguments = new String[1];
        }
        arguments[0] = "./" + autogen.getName();

        getLog().info( "args: " + Arrays.toString(arguments) );

        final int result = NarUtil.runCommand( "sh", arguments, targetDir, null, getLog() );
        if ( result != 0 )
        {
            throw new MojoExecutionException( "'" + autogen.getName() + "' errorcode: " + result );
        }
    }
}