servuo/Scripts/Abilities/Focus.cs

using System.Collections.Generic;
using Server.Mobiles;

namespace Server.Items
{
    public class Focus
    {
        private static readonly Dictionary<Mobile, FocusInfo> m_Table = new Dictionary<Mobile, FocusInfo>();
        private static readonly int DefaultDamageBonus = -40;

        public static void Initialize()
        {
            EventSink.Login += OnLogin;
        }

        public class FocusInfo
        {
            public Mobile Target { get; set; }
            public int DamageBonus { get; set; }

            public FocusInfo(Mobile defender, int bonus)
            {
                Target = defender;
                DamageBonus = bonus;
            }
        }

        public static void OnLogin(LoginEventArgs e)
        {
            PlayerMobile pm = e.Mobile as PlayerMobile;

            if (pm != null)
            {
                UpdateBuff(pm);
            }
        }

        public static void UpdateBuff(Mobile from, Mobile target = null)
        {
            Item item = from.FindItemOnLayer(Layer.TwoHanded);

            if (item == null)
            {
                item = from.FindItemOnLayer(Layer.OneHanded);
            }

            if (item == null)
            {
                if (m_Table.ContainsKey(from))
                {
                    m_Table.Remove(from);
                    BuffInfo.RemoveBuff(from, BuffIcon.RageFocusingBuff);
                }
            }
            else if (item is BaseWeapon && ((BaseWeapon)item).ExtendedWeaponAttributes.Focus > 0)
            {
                if (m_Table.ContainsKey(from))
                {
                    FocusInfo info = m_Table[from];

                    BuffInfo.AddBuff(from, new BuffInfo(BuffIcon.RageFocusingBuff, 1151393, 1151394,
                        string.Format("{0}\t{1}", info.Target == null ? "NONE" : info.Target.Name, info.DamageBonus)));
                }

                m_Table[from] = new FocusInfo(target, DefaultDamageBonus);
            }
        }

        public static int GetBonus(Mobile from, Mobile target)
        {
            if (m_Table.ContainsKey(from))
            {
                FocusInfo info = m_Table[from];

                if (info.Target == target)
                {
                    return info.DamageBonus;
                }
            }

            return 0;
        }

        public static void OnHit(Mobile attacker, Mobile defender)
        {
            if (m_Table.ContainsKey(attacker))
            {
                FocusInfo info = m_Table[attacker];

                if (info.Target == null)
                {
                    info.DamageBonus -= 10;
                }
                else if (info.Target == defender)
                {
                    if (info.DamageBonus < -40)
                        info.DamageBonus += 10;
                    else
                        info.DamageBonus += 8;
                }
                else
                {
                    if (info.DamageBonus >= -50)
                        info.DamageBonus = DefaultDamageBonus;
                }

                if (info.Target != defender)
                    info.Target = defender;

                UpdateBuff(attacker, defender);
            }
        }
    }
}