ModernUO/Projects/UOContent/Spells/Necromancy/CurseWeapon.cs

using System;
using System.Collections.Generic;
using Server.Items;

namespace Server.Spells.Necromancy;

public class CurseWeaponSpell : NecromancerSpell
{
    private static readonly SpellInfo _info = new(
        "Curse Weapon",
        "An Sanct Gra Char",
        203,
        9031,
        Reagent.PigIron
    );

    private static readonly Dictionary<BaseWeapon, ExpireTimer> _table = new();

    public CurseWeaponSpell(Mobile caster, Item scroll = null) : base(caster, scroll, _info)
    {
    }

    public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(0.75);

    public override double RequiredSkill => 0.0;
    public override int RequiredMana => 7;

    public override void OnCast()
    {
        if (Caster.Weapon is not BaseWeapon weapon || weapon is Fists)
        {
            Caster.SendLocalizedMessage(501078); // You must be holding a weapon.
        }
        else if (CheckSequence())
        {
            /* Temporarily imbues a weapon with a life draining effect.
             * Half the damage that the weapon inflicts is added to the necromancer's health.
             * The effects lasts for (Spirit Speak skill level / 34) + 1 seconds.
             *
             * NOTE: Above algorithm is fixed point, should be :
             * (Spirit Speak skill level / 3.4) + 1
             *
             * TODO: What happens if you curse a weapon then give it to someone else? Should they get the drain effect?
             */

            Caster.PlaySound(0x387);
            Caster.FixedParticles(0x3779, 1, 15, 9905, 32, 2, EffectLayer.Head);
            Caster.FixedParticles(0x37B9, 1, 14, 9502, 32, 5, (EffectLayer)255);
            Timer.StartTimer(TimeSpan.FromSeconds(0.75), () => Caster.PlaySound(0xFA));

            var duration = TimeSpan.FromSeconds(Caster.Skills.SpiritSpeak.Value / 3.4 + 1.0);

            _table.TryGetValue(weapon, out var timer);
            timer?.Stop();

            weapon.Cursed = true;
            _table[weapon] = timer = new ExpireTimer(weapon, duration);

            timer.Start();
        }

        FinishSequence();
    }

    private class ExpireTimer : Timer
    {
        private BaseWeapon _weapon;

        public ExpireTimer(BaseWeapon weapon, TimeSpan delay) : base(delay) => _weapon = weapon;

        protected override void OnTick()
        {
            _weapon.Cursed = false;
            Effects.PlaySound(_weapon.GetWorldLocation(), _weapon.Map, 0xFA);
            _table.Remove(_weapon);
        }
    }
}