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/*

 *  $Id: Pack.java,v 1.1 2006/06/14 07:29:07 cesar Exp $

 *  IzPack

 *  Copyright (C) 2001-2004 Julien Ponge

 *

 *  File :               Pack.java

 *  Description :        Contains informations about a pack.

 *  Author's email :     julien@izforge.com

 *  Author's Website :   http://www.izforge.com

 *

 *  This program is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU General Public License

 *  as published by the Free Software Foundation; either version 2

 *  of the License, or any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

 */

package com.izforge.izpack;

import com.izforge.izpack.compiler.PackInfo;

import java.io.Serializable;

import java.text.DecimalFormat;

import java.util.List;

import java.util.HashMap;

import java.util.ArrayList;

/**

 *  Represents a Pack.

 *

 * @author     Julien Ponge

 */

public class Pack implements Serializable

{

  public boolean loose;

  /**  The pack name. */

  public String name;

  /** The langpack id */

  public String id;

  /**  The pack description. */

  public String description;

  /**  The target operation system of this pack */

  public List osConstraints = null;

  /**  The list of packs this pack depends on */

  public List dependencies = null;

  /** Reverse dependencies(childs) */

  public List revDependencies = null;

  /**  True if the pack is required. */

  public boolean required;

  /**  The bumber of bytes contained in the pack. */

  public long nbytes;

  /**  Whether this pack is suggested (preselected for installation). */

  public boolean preselected;

  /** The color of the node. This is used for the dependency graph algorithms */

  public int color;

  /** white colour*/

  public final static int WHITE = 0;

  /** grey colour*/

  public final static int GREY  = 1;

  /** black colour*/

  public final static int BLACK = 2;

  /**

   *  The constructor.

   *

   * @param  name         The pack name.

   * @param  description  The pack description.

   * @param  osConstraints the OS constraint (or null for any OS)

   * @param  required     Indicates wether the pack is required or not.

   * @param  preselected  This pack will be selected automatically.

   */

  public Pack(

    String name,

    String id, 

    String description,

    List osConstraints,

    List dependencies,

    boolean required,

    boolean preselected,

    boolean loose)

  {

    this.name = name;

    this.id = id;

    this.description = description;

    this.osConstraints = osConstraints;

    this.dependencies = dependencies;

    this.required = required;

    this.preselected = preselected;

    this.loose = loose;

    nbytes = 0;

    color = PackInfo.WHITE;

  }

  /**

   *  To a String (usefull for JLists).

   *

   * @return    The String representation of the pack.

   */

  public String toString()

  {

    return name + " (" + description + ")";

  }

  /** getter method */

  public List getDependencies()

  {

    return dependencies;

  }

  /**

   * This adds a reverse dependency. With a reverse dependency we imply a child

   * dependency or the dependents on this pack

   *

   * @param name The name of the pack that depents to this pack

   */

  public void addRevDep(String name)

  {

    if(revDependencies == null)

      revDependencies = new ArrayList();

    revDependencies.add(name);

  }

  /**

   * Creates a text list of all the packs it depend on

   * @return the created text

   */

  public String depString()

  {

    String text ="";

    if (dependencies==null)

      return text;

    String name = null;

    for (int i = 0; i < dependencies.size()-1; i++)

    {

      name = (String) dependencies.get(i);

      text += name+",";

    }

    name=(String) dependencies.get(dependencies.size()-1);

    text += name;

    return text;

  }

  /**  Used of conversions. */

  private final static double KILOBYTES = 1024.0;

  /**  Used of conversions. */

  private final static double MEGABYTES = 1024.0 * 1024.0;

  /**  Used of conversions. */

  private final static double GIGABYTES = 1024.0 * 1024.0 * 1024.0;

  /**  Used of conversions. */

  private final static DecimalFormat formatter = new DecimalFormat("#,###.##");

  /**

   *  Convert bytes into appropiate mesaurements.

   *

   * @param  bytes  A number of bytes to convert to a String.

   * @return        The String-converted value.

   */

  public static String toByteUnitsString(int bytes)

  {

    if (bytes < KILOBYTES)

      return String.valueOf(bytes) + " bytes";

    else if (bytes < (MEGABYTES))

    {

      double value = bytes / KILOBYTES;

      return formatter.format(value) + " KB";

    } else if (bytes < (GIGABYTES))

    {

      double value = bytes / MEGABYTES;

      return formatter.format(value) + " MB";

    } else

    {

      double value = bytes / GIGABYTES;

      return formatter.format(value) + " GB";

    }

  }

}