/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */

package at.gv.egovernment.moaspss.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

/**
 * Utility for accessing files on the file system, and for reading from input
 * streams.
 *
 * @author Paul Ivancsics
 * @version $Id$
 */
public class FileUtils {

  /**
   * Reads a file, given by URL, into a byte array.
   *
   * @param urlString file URL
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static byte[] readURL(String urlString) throws IOException {
    final URL url = new URL(urlString);
    final InputStream in = new BufferedInputStream(url.openStream());
    final byte[] content = StreamUtils.readStream(in);
    in.close();
    return content;
  }

  /**
   * Reads a file, given by URL, into a String.
   *
   * @param urlString file URL
   * @param encoding  character encoding
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static String readURL(String urlString, String encoding) throws IOException {
    final byte[] content = readURL(urlString);
    return new String(content, encoding);
  }

  /**
   * Reads a file, given by filename, into a byte array.
   *
   * @param filename filename
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static byte[] readFile(String filename) throws IOException {
    final BufferedInputStream in = new BufferedInputStream(new FileInputStream(filename));
    final byte[] content = StreamUtils.readStream(in);
    in.close();
    return content;
  }

  /**
   * Reads a file, given by filename, into a String.
   *
   * @param filename filename
   * @param encoding character encoding
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static String readFile(String filename, String encoding) throws IOException {
    final byte[] content = readFile(filename);
    return new String(content, encoding);
  }

  /**
   * Reads a file from a resource.
   *
   * @param name resource name
   * @return file content as a byte array
   * @throws IOException on any exception thrown
   */
  public static byte[] readResource(String name) throws IOException {
    final ClassLoader cl = FileUtils.class.getClassLoader();
    final BufferedInputStream in = new BufferedInputStream(cl.getResourceAsStream(name));
    final byte[] content = StreamUtils.readStream(in);
    in.close();
    return content;
  }

  /**
   * Reads a file from a resource.
   *
   * @param name     filename
   * @param encoding character encoding
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static String readResource(String name, String encoding) throws IOException {
    final byte[] content = readResource(name);
    return new String(content, encoding);
  }

  /**
   * Returns the absolute URL of a given url which is relative to the parameter
   * root
   *
   * @param url
   * @param root
   * @return String
   */
  public static String makeAbsoluteURL(String url, String root) {
    // if url is relative to rootConfigFileDirName make it absolute

    File keyFile;
    String newURL = url;

    if (null == url) {
      return null;
    }

    if (url.startsWith("http:/") || url.startsWith("https:/") || url.startsWith("file:/") || url.startsWith(
        "ftp:/")) {
      return url;
    } else {
      // check if absolute - if not make it absolute
      keyFile = new File(url);
      if (!keyFile.isAbsolute()) {
        keyFile = new File(root, url);

        if (keyFile.toString().startsWith("file:")) {
          newURL = keyFile.toString();
        } else {
          newURL = keyFile.toURI().toString();
        }

      }
      return newURL;
    }
  }

  private static void copy(InputStream fis, OutputStream fos) {
    try {
      final byte[] buffer = new byte[0xFFFF];
      for (int len; (len = fis.read(buffer)) != -1;) {
        fos.write(buffer, 0, len);
      }
    } catch (final IOException e) {
      System.err.println(e);
    } finally {
      if (fis != null) {
        try {
          fis.close();
        } catch (final IOException e) {
          e.printStackTrace();
        }
      }
      if (fos != null) {
        try {
          fos.close();
        } catch (final IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  public static void copyFile(File src, File dest) {
    try {
      copy(new FileInputStream(src), new FileOutputStream(dest));
    } catch (final IOException e) {
      e.printStackTrace();
    }
  }

}