/*
 * MIT License
 *
 * Copyright (c) 2020-present Cloudogu GmbH and Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
    
package sonia.scm.util;

//~--- non-JDK imports --------------------------------------------------------

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sonia.scm.io.SimpleCommand;
import sonia.scm.io.SimpleCommandResult;

//~--- JDK imports ------------------------------------------------------------

import java.io.IOException;

import java.util.Scanner;

/**
 *
 * @author Sebastian Sdorra
 */
public final class RegistryUtil
{

  /** the logger for RegistryUtil */
  private static final Logger logger =
    LoggerFactory.getLogger(RegistryUtil.class);

  //~--- constructors ---------------------------------------------------------

  /**
   * Constructs ...
   *
   */
  private RegistryUtil() {}

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param key
   *
   * @return
   */
  public static String getRegistryValue(String key)
  {
    return getRegistryValue(key, null, null);
  }

  /**
   * Method description
   *
   *
   * @param key
   * @param defaultValue
   *
   * @return
   */
  public static String getRegistryValue(String key, String defaultValue)
  {
    return getRegistryValue(key, null, defaultValue);
  }

  /**
   * Method description
   *
   *
   * @param key
   * @param subKey
   * @param defaultValue
   *
   * @return
   */
  public static String getRegistryValue(String key, String subKey,
    String defaultValue)
  {
    String value = defaultValue;
    SimpleCommand command = null;

    if (subKey != null)
    {
      command = new SimpleCommand("reg", "query", key, "/v", subKey);
    }
    else
    {
      command = new SimpleCommand("reg", "query", key, "/ve");
    }

    try
    {
      SimpleCommandResult result = command.execute();

      if (result.isSuccessfull())
      {
        String output = result.getOutput();
        Scanner scanner = new Scanner(output);

        while (scanner.hasNextLine())
        {
          String line = scanner.nextLine();
          int index = line.indexOf("REG_SZ");

          if (index > 0)
          {
            value = line.substring(index + "REG_SZ".length()).trim();

            if (value.startsWith("\""))
            {
              value = value.substring(1);
              value = value.substring(0, value.indexOf('"'));
            }

            if (logger.isDebugEnabled())
            {
              logger.debug("registry value {} at {}", value, key);
            }

            break;
          }
        }
      }
    }
    catch (IOException ex)
    {
      logger.error(ex.getMessage(), ex);
    }

    return value;
  }
}
