/***************************************************************************
 *                                Serial.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;

namespace Server
{
  public struct Serial : IComparable, IComparable<Serial>
  {
    public static readonly Serial MinusOne = new Serial(-1);
    public static readonly Serial Zero = new Serial(0);

    public static Serial LastMobile{ get; private set; } = Zero;

    public static Serial LastItem{ get; private set; } = 0x40000000;

    public static Serial NewMobile
    {
      get
      {
        while (World.FindMobile(LastMobile = LastMobile + 1) != null)
        {
        }

        return LastMobile;
      }
    }

    public static Serial NewItem
    {
      get
      {
        while (World.FindItem(LastItem = LastItem + 1) != null)
        {
        }

        return LastItem;
      }
    }

    private Serial(int serial)
    {
      Value = serial;
    }

    public int Value{ get; }

    public bool IsMobile => Value > 0 && Value < 0x40000000;

    public bool IsItem => Value >= 0x40000000 && Value <= 0x7FFFFFFF;

    public bool IsValid => Value > 0;

    public override int GetHashCode()
    {
      return Value;
    }

    public int CompareTo(Serial other)
    {
      return Value.CompareTo(other.Value);
    }

    public int CompareTo(object other)
    {
      if (other is Serial serial)
        return CompareTo(serial);

      if (other == null)
        return -1;

      throw new ArgumentException();
    }

    public override bool Equals(object o)
    {
      if (!(o is Serial serial))
        return false;

      return serial.Value == Value;
    }

    public static bool operator ==(Serial l, Serial r)
    {
      return l.Value == r.Value;
    }

    public static bool operator !=(Serial l, Serial r)
    {
      return l.Value != r.Value;
    }

    public static bool operator >(Serial l, Serial r)
    {
      return l.Value > r.Value;
    }

    public static bool operator <(Serial l, Serial r)
    {
      return l.Value < r.Value;
    }

    public static bool operator >=(Serial l, Serial r)
    {
      return l.Value >= r.Value;
    }

    public static bool operator <=(Serial l, Serial r)
    {
      return l.Value <= r.Value;
    }

    /*public static Serial operator ++ ( Serial l )
    {
      return new Serial( l + 1 );
    }*/

    public override string ToString()
    {
      return $"0x{Value:X8}";
    }

    public static implicit operator int(Serial a)
    {
      return a.Value;
    }

    public static implicit operator Serial(int a)
    {
      return new Serial(a);
    }
  }
}