ModernUO/Projects/UOContent/Spells/Base/SpecialMove.cs

using System;
using System.Collections.Generic;
using Server.Engines.ConPVP;
using Server.Items;
using Server.Spells.Bushido;
using Server.Spells.Necromancy;
using Server.Spells.Ninjitsu;

namespace Server.Spells
{
    public abstract class SpecialMove
    {
        private static readonly Dictionary<Mobile, SpecialMoveContext> _playersTable = new();

        public virtual int BaseMana => 0;

        public virtual SkillName MoveSkill => SkillName.Bushido;
        public virtual double RequiredSkill => 0.0;

        public virtual TextDefinition AbilityMessage => TextDefinition.Empty;

        public virtual bool BlockedByAnimalForm => true;
        public virtual bool DelayedContext => false;

        public static Dictionary<Mobile, SpecialMove> Table { get; } = new();

        public virtual bool ValidatesDuringHit => true;

        public virtual int GetAccuracyBonus(Mobile attacker) => 0;

        public virtual double GetDamageScalar(Mobile attacker, Mobile defender) => 1.0;

        // Called before swinging, to make sure the accuracy scalar is to be computed.
        public virtual bool OnBeforeSwing(Mobile attacker, Mobile defender) => true;

        // Called when a hit connects, but before damage is calculated.
        public virtual bool OnBeforeDamage(Mobile attacker, Mobile defender) => true;

        // Called as soon as the ability is used.
        public virtual void OnUse(Mobile from)
        {
        }

        // Called when a hit connects, at the end of the weapon.OnHit() method.
        public virtual void OnHit(Mobile attacker, Mobile defender, int damage)
        {
        }

        // Called when a hit misses.
        public virtual void OnMiss(Mobile attacker, Mobile defender)
        {
        }

        // Called when the move is cleared.
        public virtual void OnClearMove(Mobile from)
        {
        }

        public virtual bool IgnoreArmor(Mobile attacker) => false;

        public virtual double GetPropertyBonus(Mobile attacker) => 1.0;

        public virtual bool CheckSkills(Mobile m)
        {
            if (m.Skills[MoveSkill].Value < RequiredSkill)
            {
                // You need at least ~1_SKILL_REQUIREMENT~ ~2_SKILL_NAME~ skill to use that ability.
                m.SendLocalizedMessage(1063013, $"{RequiredSkill:F1}\t{MoveSkill}\t ");
                return false;
            }

            return true;
        }

        public virtual int ScaleMana(Mobile m, int mana)
        {
            var scalar = 1.0;

            if (!MindRotSpell.GetMindRotScalar(m, ref scalar))
            {
                scalar = 1.0;
            }

            // Lower Mana Cost = 40%
            var lmc = Math.Min(AosAttributes.GetValue(m, AosAttribute.LowerManaCost), 40);

            scalar -= (double)lmc / 100;

            var total = (int)(mana * scalar);

            if (m.Skills[MoveSkill].Value < 50.0 && GetContext(m) != null)
            {
                total *= 2;
            }

            return total;
        }

        public virtual bool CheckMana(Mobile from, bool consume)
        {
            var mana = ScaleMana(from, BaseMana);

            if (from.Mana < mana)
            {
                // You need ~1_MANA_REQUIREMENT~ mana to perform that attack
                from.SendLocalizedMessage(1060181, mana.ToString());
                return false;
            }

            if (consume)
            {
                if (!DelayedContext)
                {
                    SetContext(from);
                }

                from.Mana -= mana;
            }

            return true;
        }

        public virtual void SetContext(Mobile from)
        {
            if (GetContext(from) == null)
            {
                if (DelayedContext || from.Skills[MoveSkill].Value < 50.0)
                {
                    Timer timer = new SpecialMoveTimer(from);
                    timer.Start();

                    AddContext(from, new SpecialMoveContext(timer, GetType()));
                }
            }
        }

        public virtual bool Validate(Mobile from)
        {
            if (!from.Player)
            {
                return true;
            }

            if (HonorableExecution.IsUnderPenalty(from))
            {
                from.SendLocalizedMessage(1063024); // You cannot perform this special move right now.
                return false;
            }

            if (AnimalForm.UnderTransformation(from))
            {
                from.SendLocalizedMessage(1063024); // You cannot perform this special move right now.
                return false;
            }

            var option = this switch
            {
                Backstab           => "Backstab",
                DeathStrike        => "Death Strike",
                FocusAttack        => "Focus Attack",
                KiAttack           => "Ki Attack",
                SurpriseAttack     => "Surprise Attack",
                HonorableExecution => "Honorable Execution",
                LightningStrike    => "Lightning Strike",
                MomentumStrike     => "Momentum Strike",
                _                  => null
            };

            if (option != null && !DuelContext.AllowSpecialMove(from, option, this))
            {
                return false;
            }

            return CheckSkills(from) && CheckMana(from, false);
        }

        public virtual void CheckGain(Mobile m)
        {
            m.CheckSkill(MoveSkill, RequiredSkill, RequiredSkill + 37.5);
        }

        public static void ClearAllMoves(Mobile m)
        {
            foreach (var kvp in SpellRegistry.SpecialMoves)
            {
                var moveID = kvp.Key;

                if (moveID != -1)
                {
                    m.NetState.SendToggleSpecialAbility(moveID + 1, false);
                }
            }
        }

        public static SpecialMove GetCurrentMove(Mobile m)
        {
            if (m == null)
            {
                return null;
            }

            if (!Core.SE)
            {
                ClearCurrentMove(m);
                return null;
            }

            if (Table.TryGetValue(m, out var move) && move.ValidatesDuringHit && !move.Validate(m))
            {
                ClearCurrentMove(m);
                return null;
            }

            return move;
        }

        public static bool SetCurrentMove(Mobile m, SpecialMove move)
        {
            if (!Core.SE)
            {
                ClearCurrentMove(m);
                return false;
            }

            if (move?.Validate(m) == false)
            {
                ClearCurrentMove(m);
                return false;
            }

            var sameMove = move == GetCurrentMove(m);

            ClearCurrentMove(m);

            if (sameMove)
            {
                return true;
            }

            if (move != null)
            {
                WeaponAbility.ClearCurrentAbility(m);

                Table[m] = move;

                move.OnUse(m);

                var moveID = SpellRegistry.GetRegistryNumber(move);

                if (moveID > 0)
                {
                    m.NetState.SendToggleSpecialAbility(moveID + 1, true);
                }

                move.AbilityMessage.SendMessageTo(m);
            }

            return true;
        }

        public static void ClearCurrentMove(Mobile m)
        {
            if (Table.Remove(m, out var move))
            {
                move.OnClearMove(m);

                var moveID = SpellRegistry.GetRegistryNumber(move);

                if (moveID > 0)
                {
                    m.NetState.SendToggleSpecialAbility(moveID + 1, false);
                }
            }
        }

        private static void AddContext(Mobile m, SpecialMoveContext context)
        {
            _playersTable[m] = context;
        }

        private static void RemoveContext(Mobile m)
        {
            var context = GetContext(m);

            if (context != null)
            {
                _playersTable.Remove(m);

                context.Timer.Stop();
            }
        }

        private static SpecialMoveContext GetContext(Mobile m) => _playersTable.GetValueOrDefault(m);

        private class SpecialMoveTimer : Timer
        {
            private readonly Mobile m_Mobile;

            public SpecialMoveTimer(Mobile from) : base(TimeSpan.FromSeconds(3.0)) => m_Mobile = from;

            protected override void OnTick()
            {
                RemoveContext(m_Mobile);
            }
        }

        public class SpecialMoveContext
        {
            public SpecialMoveContext(Timer timer, Type type)
            {
                Timer = timer;
                Type = type;
            }

            public Timer Timer { get; }

            public Type Type { get; }
        }
    }
}