fix: Adds missing ML Abilities (#799)

Projects/UOContent/Items/Weapons/Abilities/ForceArrow.cs

@@ -0,0 +1,164 @@
+using Server.Spells;
+using System;
+using System.Collections.Generic;
+
+namespace Server.Items
+{
+    public class ForceArrow : WeaponAbility
+    {
+        public override int BaseMana => 20;
+
+        public override bool RequiresTactics(Mobile from) => false;
+
+        public override void OnHit(Mobile attacker, Mobile defender, int damage)
+        {
+            if (!Validate(attacker) || !CheckMana(attacker, true))
+            {
+                return;
+            }
+
+            ClearCurrentAbility(attacker);
+
+            attacker.SendLocalizedMessage(1074381); // You fire an arrow of pure force.
+            defender.SendLocalizedMessage(1074382); // You are struck by a force arrow!
+
+            if (0.4 > Utility.RandomDouble())
+            {
+                defender.Combatant = null;
+                defender.Warmode = false;
+            }
+
+            ForceArrowInfo info = GetInfo(attacker, defender);
+
+            if (info == null)
+            {
+                BeginForceArrow(attacker, defender);
+            }
+            else if (info.Timer.Running)
+            {
+                info.Timer.IncreaseExpiration();
+
+                BuffInfo.RemoveBuff(defender, BuffIcon.ForceArrow);
+                BuffInfo.AddBuff(defender, new BuffInfo(BuffIcon.ForceArrow, 1151285, 1151286, info.DefenseChanceMalus.ToString()));
+            }
+
+            if (defender.Spell is Spell spell && spell.IsCasting)
+            {
+                spell.Disturb(DisturbType.Hurt, false, true);
+            }
+        }
+
+        private static readonly Dictionary<Mobile, List<ForceArrowInfo>> _table = new Dictionary<Mobile, List<ForceArrowInfo>>();
+
+        public static void BeginForceArrow(Mobile attacker, Mobile defender)
+        {
+            ForceArrowInfo info = new ForceArrowInfo(attacker, defender);
+            info.Timer = new ForceArrowTimer(info);
+
+            if (_table.TryGetValue(attacker, out var list))
+            {
+                list.Add(info);
+            }
+            else
+            {
+                _table.Add(attacker, new List<ForceArrowInfo>() { info });
+            }
+
+            BuffInfo.AddBuff(defender, new BuffInfo(BuffIcon.ForceArrow, 1151285, 1151286, info.DefenseChanceMalus.ToString()));
+        }
+
+        public static void EndForceArrow(ForceArrowInfo info)
+        {
+            if (info == null)
+            {
+                return;
+            }
+
+            Mobile attacker = info.Attacker;
+
+            if (_table.TryGetValue(attacker, out var list) && list.Remove(info) && list.Count == 0)
+            {
+                _table.Remove(attacker);
+            }
+
+            BuffInfo.RemoveBuff(info.Defender, BuffIcon.ForceArrow);
+        }
+
+        public static bool HasForceArrow(Mobile attacker, Mobile defender)
+        {
+            if (_table.TryGetValue(attacker, out var list))
+            {
+                foreach (ForceArrowInfo info in list)
+                {
+                    if (info.Defender == defender)
+                    {
+                        return true;
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        public static ForceArrowInfo GetInfo(Mobile attacker, Mobile defender)
+        {
+            if (_table.TryGetValue(attacker,out var list))
+            {
+                foreach (ForceArrowInfo info in list)
+                {
+                    if (info.Defender == defender)
+                    {
+                        return info;
+                    }
+                }
+            }
+
+            return null;
+        }
+
+        public class ForceArrowInfo
+        {
+            public Mobile Attacker { get; }
+            public Mobile Defender { get; }
+            public ForceArrowTimer Timer { get; set; }
+            public int DefenseChanceMalus { get; set; }
+
+            public ForceArrowInfo(Mobile attacker, Mobile defender)
+            {
+                Attacker = attacker;
+                Defender = defender;
+                DefenseChanceMalus = 10;
+            }
+        }
+
+        public class ForceArrowTimer : Timer
+        {
+            private readonly ForceArrowInfo _info;
+            private DateTime _expires;
+
+            public ForceArrowTimer(ForceArrowInfo info)
+                : base(TimeSpan.FromSeconds(1.0), TimeSpan.FromSeconds(1))
+            {
+                _info = info;
+                _expires = Core.Now + TimeSpan.FromSeconds(10);
+
+                Start();
+            }
+
+            protected override void OnTick()
+            {
+                if (_expires < Core.Now)
+                {
+                    Stop();
+                    EndForceArrow(_info);
+                }
+            }
+
+            public void IncreaseExpiration()
+            {
+                _expires += TimeSpan.FromSeconds(2);
+                _info.DefenseChanceMalus += 5;
+            }
+        }
+    }
+}