package net.sourceforge.solexatools.util;

/*
 * 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.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import javax.servlet.http.HttpServletRequest;

/**
 * <p>
 * ZipFileUtil class.
 * </p>
 * 
 * @author boconnor
 * @version $Id: $Id
 */
public class ZipFileUtil {

    /**
     * Unpack a zip file
     * 
     * @param theFile
     *            a {@link java.io.File} object.
     * @param targetDir
     *            a {@link java.io.File} object.
     * @return the file
     * @throws java.io.IOException
     *             if any.
     * @param request
     *            a {@link javax.servlet.http.HttpServletRequest} object.
     */
    public static java.io.File unpackArchive(File theFile, File targetDir, HttpServletRequest request) throws IOException {

        if (!theFile.exists()) {
            throw new IOException(theFile.getAbsolutePath() + " does not exist");
        }
        if (!buildDirectory(targetDir)) {
            throw new IOException("Could not create directory: " + targetDir);
        }
        try (ZipFile zipFile = new ZipFile(theFile)) {
            for (Enumeration entries = zipFile.entries(); entries.hasMoreElements();) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                File file = new File(targetDir, File.separator + entry.getName());
                if (!buildDirectory(file.getParentFile())) {
                    throw new IOException("Could not create directory: " + file.getParentFile());
                }
                if (!entry.isDirectory()) {
                    copyInputStream(zipFile.getInputStream(entry), new BufferedOutputStream(new FileOutputStream(file)));
                } else {
                    if (!buildDirectory(file)) {
                        throw new IOException("Could not create directory: " + file);
                    }
                }
                
            }
        }
        return theFile;
    }

    /**
     * <p>
     * copyInputStream.
     * </p>
     * 
     * @param in
     *            a {@link java.io.InputStream} object.
     * @param out
     *            a {@link java.io.OutputStream} object.
     * @throws java.io.IOException
     *             if any.
     */
    public static void copyInputStream(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int len = in.read(buffer);
        while (len >= 0) {
            out.write(buffer, 0, len);
            len = in.read(buffer);
        }
        in.close();
        out.close();
    }

    /**
     * <p>
     * buildDirectory.
     * </p>
     * 
     * @param file
     *            a {@link java.io.File} object.
     * @return a boolean.
     */
    public static boolean buildDirectory(File file) {
        return file.exists() || file.mkdirs();
    }
}