ModernUO/Projects/Scripts/Spells/Bushido/Evasion.cs

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

namespace Server.Spells.Bushido
{
  public class Evasion : SamuraiSpell
  {
    private static readonly SpellInfo m_Info = new SpellInfo(
      "Evasion", null,
      -1,
      9002);

    private static readonly Dictionary<Mobile, Timer> m_Table = new Dictionary<Mobile, Timer>();

    public Evasion(Mobile caster, Item scroll)
      : base(caster, scroll, m_Info)
    {
    }

    public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(0.25);

    public override double RequiredSkill => 60.0;
    public override int RequiredMana => 10;

    public override bool CheckCast() => VerifyCast(Caster, true) && base.CheckCast();

    public static bool VerifyCast(Mobile caster, bool messages)
    {
      if (caster == null) // Sanity
        return false;

      if (!(caster.FindItemOnLayer(Layer.OneHanded) is BaseWeapon weap))
        weap = caster.FindItemOnLayer(Layer.TwoHanded) as BaseWeapon;

      if (weap != null)
      {
        if (Core.ML && caster.Skills[weap.Skill].Base < 50)
        {
          if (messages)
            caster.SendLocalizedMessage(
              1076206); // Your skill with your equipped weapon must be 50 or higher to use Evasion.
          return false;
        }
      }
      else if (!(caster.FindItemOnLayer(Layer.TwoHanded) is BaseShield))
      {
        if (messages)
          caster.SendLocalizedMessage(1062944); // You must have a weapon or a shield equipped to use this ability!
        return false;
      }

      if (!caster.CanBeginAction<Evasion>())
      {
        if (messages) caster.SendLocalizedMessage(501789); // You must wait before trying again.
        return false;
      }

      return true;
    }

    public static bool CheckSpellEvasion(Mobile defender)
    {
      if (!(defender.FindItemOnLayer(Layer.OneHanded) is BaseWeapon weap))
        weap = defender.FindItemOnLayer(Layer.TwoHanded) as BaseWeapon;

      if (Core.ML)
      {
        if (defender.Spell?.IsCasting == true) return false;

        if (weap != null)
        {
          if (defender.Skills[weap.Skill].Base < 50) return false;
        }
        else if (!(defender.FindItemOnLayer(Layer.TwoHanded) is BaseShield))
        {
          return false;
        }
      }

      if (IsEvading(defender) && BaseWeapon.CheckParry(defender))
      {
        defender.Emote("*evades*"); // Yes.  Eew.  Blame OSI.
        defender.FixedEffect(0x37B9, 10, 16);
        return true;
      }

      return false;
    }

    public override void OnBeginCast()
    {
      base.OnBeginCast();

      Caster.FixedEffect(0x37C4, 10, 7, 4, 3);
    }

    public override void OnCast()
    {
      if (CheckSequence())
      {
        Caster.SendLocalizedMessage(1063120); // You feel that you might be able to deflect any attack!
        Caster.FixedParticles(0x376A, 1, 20, 0x7F5, 0x960, 3, EffectLayer.Waist);
        Caster.PlaySound(0x51B);

        OnCastSuccessful(Caster);

        BeginEvasion(Caster);

        Caster.BeginAction<Evasion>();
        Timer.DelayCall(TimeSpan.FromSeconds(20.0), Caster.EndAction<Evasion>);
      }

      FinishSequence();
    }

    public static bool IsEvading(Mobile m) => m_Table.ContainsKey(m);

    public static TimeSpan GetEvadeDuration(Mobile m)
    {
      /* Evasion duration now scales with Bushido skill
       *
       * If the player has higher than GM Bushido, and GM Tactics and Anatomy, they get a 1 second bonus
       * Evasion duration range:
       * o 3-6 seconds w/o tactics/anatomy
       * o 6-7 seconds w/ GM+ Bushido and GM tactics/anatomy
       */

      if (!Core.ML)
        return TimeSpan.FromSeconds(8.0);

      double seconds = 3;

      if (m.Skills.Bushido.Value > 60)
        seconds += (m.Skills.Bushido.Value - 60) / 20;

      if (m.Skills.Anatomy.Value >= 100.0 && m.Skills.Tactics.Value >= 100.0 && m.Skills.Bushido.Value > 100.0) // Bushido being HIGHER than 100 for bonus is intended
        seconds++;

      return TimeSpan.FromSeconds((int)seconds);
    }

    public static double GetParryScalar(Mobile m)
    {
      /* Evasion modifier to parry now scales with Bushido skill
       *
       * If the player has higher than GM Bushido, and at least GM Tactics and Anatomy, they get a bonus to their evasion modifier (10% bonus to the evasion modifier to parry NOT 10% to the final parry chance)
       *
       * Bonus modifier to parry range: (these are the ranges for the evasion modifier)
       * o 16-40% bonus w/o tactics/anatomy
       * o 42-50% bonus w/ GM+ bushido and GM tactics/anatomy
       */

      if (!Core.ML)
        return 1.5;

      double bonus = 0;

      if (m.Skills.Bushido.Value >= 60)
        bonus += (m.Skills.Bushido.Value - 60) * .004 + 0.16;

      if (m.Skills.Anatomy.Value >= 100 && m.Skills.Tactics.Value >= 100 && m.Skills.Bushido.Value > 100) // Bushido being HIGHER than 100 for bonus is intended
        bonus += 0.10;

      return 1.0 + bonus;
    }

    public static void BeginEvasion(Mobile m)
    {
      m_Table.TryGetValue(m, out Timer timer);
      timer?.Stop();

      m_Table[m] = timer = new InternalTimer(m, GetEvadeDuration(m));
      timer.Start();
    }

    public static void EndEvasion(Mobile m)
    {
      if (m_Table.TryGetValue(m, out Timer timer))
      {
        timer.Stop();
        m_Table.Remove(m);
      }

      OnEffectEnd(m, typeof(Evasion));
    }

    private class InternalTimer : Timer
    {
      private readonly Mobile m_Mobile;

      public InternalTimer(Mobile m, TimeSpan delay)
        : base(delay)
      {
        m_Mobile = m;
        Priority = TimerPriority.TwoFiftyMS;
      }

      protected override void OnTick()
      {
        EndEvasion(m_Mobile);
        m_Mobile.SendLocalizedMessage(1063121); // You no longer feel that you could deflect any attack.
      }
    }
  }
}