/**************************************************************
 * 
 * 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 helper;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;


/**
 * This class deliver some functionality to copy files.
 */
public class FileTools {
    
    /**
     * Copies all files under srcDir to dstDir.
     * If dstDir does not exist, it will be created.
     * @param srcDir the source directory
     * @param dstDir the destination direcotry
     * @throws java.io.IOException throws java.io.IOException if something failes
     */    
    public static void copyDirectory(File srcDir, File dstDir)
           throws java.io.IOException {    
        copyDirectory(srcDir, dstDir, new String[]{});
    }
    /**
     * Copies all files under srcDir to dstDir except Files given in the
     * ignore list. This files will not be copied.
     * If dstDir does not exist, it will be created.
     * @param srcDir the source directory
     * @param dstDir the destination direcotry
     * @param ignore a list of files which should not be copied
     * @throws java.io.IOException throws java.io.IOException if something failes
     */    
    public static void copyDirectory(File srcDir, File dstDir, String[] ignore)
           throws java.io.IOException {

        for (int i=0; i<ignore.length;i++){
            if (srcDir.getName().endsWith(ignore[i])) {
                return;
            }
        }
        
        if (srcDir.isDirectory()) {
            if (!dstDir.exists()) {
                dstDir.mkdir();
            }
    
            String[] files = srcDir.list();
            for (int i=0; i< files.length; i++) {
                copyDirectory(new File(srcDir, files[i]), new File(dstDir, files[i]), ignore);
            }
        } else {
            // This method is implemented in e1071 Copying a File
            copyFile(srcDir, dstDir);
        }
    }
    
    /**
     * Copies src file to dst file. If the dst file does not exist, it is created
     * @param src the source file
     * @param dst the destination file
     * @throws java.io.IOException throws java.io.IOException if something failes
     */    
    public static void copyFile(File src, File dst) throws java.io.IOException {
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dst);
    
        // Transfer bytes from in to out
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
    }   
    /**
     * Deletes all files and subdirectories under dir and the directory itself.
     * Returns true if all deletions were successful.
     * If the deletion fails, the method the method continues to delete rest 
     * of the files and returns false.
     * @return Returns true if all deletions were successful, else false.
     * @param dir the directory to delete
     */    
    public static boolean deleteDir(File dir) {
        
        // if (! cleanDir(dir)) return false;
        
        // The directory is now empty so delete it
        // return dir.delete();
        return cleanDir(dir);
    }
    
    /**
     * Deletes all files and subdirectories under dir.
     * Returns true if all deletions were successful.
     * If a deletion fails, the method continues to delete rest of the files.
     * @return Returns true if all deletions were successful, else false.
     * @param dir the directory to clean from content
     */    
    // public static boolean cleanDir(File dir){
    //     
    //     boolean success = true;
    //     if (dir.isDirectory()){
    //         File [] theFiles = dir.listFiles();
    // 
    //         if (theFiles.length != 0 )
    //             for (int i = 0; i < theFiles.length; i++){
    //                 success &= theFiles[i].delete();
    //             }
    //     }
    //     return success;
    // }

   public static boolean cleanDir(File dir)
        {
            if (dir.isDirectory())
            {
                String[] children = dir.list();
                for (int i=0; i<children.length; i++)
                {
                    boolean success = cleanDir(new File(dir, children[i]));
                    if (!success) 
                    {
                        return false;
                    }
                }
            }
    
            // The directory is now empty so delete it
            return dir.delete();
        }
}