/******************************************************************************
 * Copyright (c) 2002 - 2006 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *****************************************************************************/
package com.ibm.wala.util.io;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;

public class TemporaryFile {

  private static Path outputDir;

  public static File urlToFile(String fileName, URL input) throws IOException {
    if (input == null) {
      throw new NullPointerException("input == null");
    }
    if (outputDir == null) {
      outputDir = Files.createTempDirectory("wala");      
    }
    Path filePath = outputDir.resolve(fileName);
    return urlToFile(filePath.toFile(), input);
  }

  public static File urlToFile(File F, URL input) throws IOException {
    return streamToFile(F, input.openStream());
  }
  
  public static File streamToFile(File F, InputStream... inputs) throws IOException {
    try (final FileOutputStream output = new FileOutputStream(F)) {
      
      int read;
      byte[] buffer = new byte[ 1024 ];
      for(InputStream input : inputs) {
        while ( (read = input.read(buffer)) != -1 ) {
          output.write(buffer, 0, read);
        }
        input.close();
      }
    }
    return F;
  }
  
  public static File stringToFile(File F, String... inputs) throws IOException {
    try (final FileOutputStream output = new FileOutputStream(F)) {

      for(String input : inputs) {
        output.write(input.getBytes(StandardCharsets.UTF_8));
      }
    }

    return F;
  }
}
