/***************************************************************************
 *                              ClientVersion.cs
 *                            -------------------
 *   begin                : May 1, 2002
 *   copyright            : (C) The RunUO Software Team
 *   email                : info@runuo.com
 *
 *   $Id$
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   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
 *   (at your option) any later version.
 *
 ***************************************************************************/

using System;
using System.Collections;
using System.Text;

namespace Server
{
  public enum ClientType
  {
    Regular,
    UOTD,
    God,
    SA
  }

  public class ClientVersion : IComparable, IComparer
  {
    public ClientVersion(int maj, int min, int rev, int pat) : this(maj, min, rev, pat, ClientType.Regular)
    {
    }

    public ClientVersion(int maj, int min, int rev, int pat, ClientType type)
    {
      Major = maj;
      Minor = min;
      Revision = rev;
      Patch = pat;
      Type = type;

      SourceString = _ToStringImpl();
    }

    public ClientVersion(string fmt)
    {
      SourceString = fmt;

      try
      {
        fmt = fmt.ToLower();

        int br1 = fmt.IndexOf('.');
        int br2 = fmt.IndexOf('.', br1 + 1);

        int br3 = br2 + 1;
        while (br3 < fmt.Length && char.IsDigit(fmt, br3))
          br3++;

        Major = Utility.ToInt32(fmt.Substring(0, br1));
        Minor = Utility.ToInt32(fmt.Substring(br1 + 1, br2 - br1 - 1));
        Revision = Utility.ToInt32(fmt.Substring(br2 + 1, br3 - br2 - 1));

        if (br3 < fmt.Length)
        {
          if (Major <= 5 && Minor <= 0 && Revision <= 6) //Anything before 5.0.7
          {
            if (!char.IsWhiteSpace(fmt, br3))
              Patch = fmt[br3] - 'a' + 1;
          }
          else
          {
            Patch = Utility.ToInt32(fmt.Substring(br3 + 1, fmt.Length - br3 - 1));
          }
        }

        if (fmt.IndexOf("god") >= 0 || fmt.IndexOf("gq") >= 0)
          Type = ClientType.God;
        else if (fmt.IndexOf("third dawn") >= 0 || fmt.IndexOf("uo:td") >= 0 || fmt.IndexOf("uotd") >= 0 ||
                 fmt.IndexOf("uo3d") >= 0 || fmt.IndexOf("uo:3d") >= 0)
          Type = ClientType.UOTD;
        else
          Type = ClientType.Regular;
      }
      catch
      {
        Major = 0;
        Minor = 0;
        Revision = 0;
        Patch = 0;
        Type = ClientType.Regular;
      }
    }

    public int Major{ get; }

    public int Minor{ get; }

    public int Revision{ get; }

    public int Patch{ get; }

    public ClientType Type{ get; }

    public string SourceString{ get; }

    public int CompareTo(object obj)
    {
      if (obj == null)
        return 1;

      ClientVersion o = obj as ClientVersion;

      if (o == null)
        throw new ArgumentException();

      if (Major > o.Major)
        return 1;
      if (Major < o.Major)
        return -1;
      if (Minor > o.Minor)
        return 1;
      if (Minor < o.Minor)
        return -1;
      if (Revision > o.Revision)
        return 1;
      if (Revision < o.Revision)
        return -1;
      if (Patch > o.Patch)
        return 1;
      if (Patch < o.Patch)
        return -1;
      return 0;
    }

    public int Compare(object x, object y)
    {
      if (IsNull(x) && IsNull(y))
        return 0;
      if (IsNull(x))
        return -1;
      if (IsNull(y))
        return 1;

      ClientVersion a = x as ClientVersion;
      ClientVersion b = y as ClientVersion;

      if (IsNull(a) || IsNull(b))
        throw new ArgumentException();

      return a.CompareTo(b);
    }

    public static bool operator ==(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) == 0;
    }

    public static bool operator !=(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) != 0;
    }

    public static bool operator >=(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) >= 0;
    }

    public static bool operator >(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) > 0;
    }

    public static bool operator <=(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) <= 0;
    }

    public static bool operator <(ClientVersion l, ClientVersion r)
    {
      return Compare(l, r) < 0;
    }

    public override int GetHashCode()
    {
      return Major ^ Minor ^ Revision ^ Patch ^ (int)Type;
    }

    public override bool Equals(object obj)
    {
      if (obj == null)
        return false;

      ClientVersion v = obj as ClientVersion;

      if (v == null)
        return false;

      return Major == v.Major
             && Minor == v.Minor
             && Revision == v.Revision
             && Patch == v.Patch
             && Type == v.Type;
    }

    private string _ToStringImpl()
    {
      StringBuilder builder = new StringBuilder(16);

      builder.Append(Major);
      builder.Append('.');
      builder.Append(Minor);
      builder.Append('.');
      builder.Append(Revision);

      if (Major <= 5 && Minor <= 0 && Revision <= 6) //Anything before 5.0.7
      {
        if (Patch > 0)
          builder.Append((char)('a' + (Patch - 1)));
      }
      else
      {
        builder.Append('.');
        builder.Append(Patch);
      }

      if (Type != ClientType.Regular)
      {
        builder.Append(' ');
        builder.Append(Type.ToString());
      }

      return builder.ToString();
    }

    public override string ToString()
    {
      return _ToStringImpl();
    }

    public static bool IsNull(object x)
    {
      return ReferenceEquals(x, null);
    }

    public static int Compare(ClientVersion a, ClientVersion b)
    {
      if (IsNull(a) && IsNull(b))
        return 0;
      if (IsNull(a))
        return -1;
      if (IsNull(b))
        return 1;

      return a.CompareTo(b);
    }
  }
}