/*
 *  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.
 *
 */
package org.apache.easyant4e.ivyde.extension;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.apache.easyant4e.Activator;
import org.eclipse.core.runtime.IStatus;

/**
 * This class unpack the default EasyAnt repository in local file system.
 * 
 * @author <a href="mailto:jerome@benois.fr">Jerome Benois</a>
 */
public class RepositoryInstaller {
	static final int BUFFER_SIZE = 102400;
	static final String REPOSITORY_ARCHIVE_PATH = "repository.zip";
	private URL interpreterZipUrl;

	public void install(File installDir) {
		this.interpreterZipUrl = Activator.getDefault().getBundle().getResource(REPOSITORY_ARCHIVE_PATH);
		try {
			unPackArchive(installDir);
		} catch (IOException e) {
			Activator.getEasyAntPlugin().log(IStatus.ERROR, "Cannot install EasyAnt repository", e);
		}
	}

	private void unPackArchive(File installDir) throws IOException {
		InputStream inputStream = this.interpreterZipUrl.openStream();
		ZipInputStream zipFileStream = new ZipInputStream(inputStream);
		ZipEntry zipEntry = zipFileStream.getNextEntry();
		while (zipEntry != null) {
			File destination = new File(installDir.getPath(), zipEntry.getName());
			if (!zipEntry.isDirectory()) {
				/*
				 * Copy files (and make sure parent directory exist)
				 */
				File parentFile = destination.getParentFile();
				boolean parentFileExist = isFileExists(parentFile);
				if (!parentFileExist) {
					parentFileExist = parentFile.mkdirs();
				}
				if (parentFileExist) {
					OutputStream os = null;
					try {
						os = new FileOutputStream(destination);
						byte[] buffer = new byte[BUFFER_SIZE];
						while (true) {
							int len = zipFileStream.read(buffer);
							if (zipFileStream.available() == 0) {
								break;
							}
							os.write(buffer, 0, len);
						}
					} finally {
						if (null != os) {
							os.close();
						}
					}
				} else {
					Activator.getEasyAntPlugin().log(IStatus.ERROR,
							"Installing EasyAnt repository, but " + parentFile + " already exists!");
				}
			} else {
				boolean created = destination.mkdirs();
				if (!created) {
					Activator.getEasyAntPlugin().log(IStatus.ERROR,
							"Installing EasyAnt repository. Cannot create directory: " + destination);
				}
			}
			zipFileStream.closeEntry();
			zipEntry = zipFileStream.getNextEntry();
		}
		inputStream.close();
		zipFileStream.close();
	}

	private boolean isFileExists(File file) {
		return (null != file && file.exists());
	}
}