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/*******************************************************************************
 * 
 * Copyright 2011 Spiffy UI Team   
 * 
 * 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.
 *
 ******************************************************************************/
package org.spiffyui.maven.plugins;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import org.spiffyui.build.GzipListUtil;

/**
 * GZip compresses specific web artifacts
 * 
 * @goal gzip
 * @phase process-classes
 */
public class GZipMojo extends AbstractMojo
{

    /**
     * {@link MavenProject} to process.
     * 
     * @parameter expression="${project}"
     * @required
     * @readonly
     */
    private MavenProject project;

    /**
     * Path of artifacts to compress.
     * 
     * @parameter default-value="${spiffyui.www}"
     * @required
     */
    private File directory;
    
    /**
     * @parameter default-value="${spiffyui.gwt.module.path}"
     * @required
     * @readonly
     */
    private File gwtModulePath;

    @Override
    public void execute()
        throws MojoExecutionException,
            MojoFailureException
    {
        File images = new File(gwtModulePath, "images");
        String[] baseExts = {
            "css", "png", "gif", "js"
        };
        String[] allExts = {
            "html", "css", "png", "gif", "js"
        };

        gzip(directory, baseExts);
        gzip(gwtModulePath, allExts);
        gzip(images, allExts);
    }

    private void gzip(File path, String[] exts)
        throws MojoExecutionException,
            MojoFailureException
    {
        List files = new ArrayList(FileUtils.listFiles(path, exts, false));
        Log log = getLog();

        log.info("GZIP: Compressing artifacts from " + path);
        for (File file : files) {
            log.debug("GZIP: " + file.toString());
        }

        try {
            GzipListUtil.zipFileList(files, path);
        } catch (IOException e) {
            throw new MojoExecutionException(e.getMessage());
        }
    }

}