using System;
using System.Collections.Generic;

namespace Server.Items
{
  /// <summary>
  ///   Raises your physical resistance for a short time while lowering your ability to inflict damage. Requires Bushido or
  ///   Ninjitsu skill.
  /// </summary>
  public class DefenseMastery : WeaponAbility
  {
    private static Dictionary<Mobile, DefenseMasteryInfo> m_Table = new Dictionary<Mobile, DefenseMasteryInfo>();

    public override int BaseMana => 30;

    public override bool CheckSkills(Mobile from)
    {
      if (GetSkill(from, SkillName.Ninjitsu) < 50.0 && GetSkill(from, SkillName.Bushido) < 50.0)
      {
        from.SendLocalizedMessage(1063347,
          "50"); // You need ~1_SKILL_REQUIREMENT~ Bushido or Ninjitsu skill to perform that attack!
        return false;
      }

      return base.CheckSkills(from);
    }

    public override void OnHit(Mobile attacker, Mobile defender, int damage)
    {
      if (!Validate(attacker) || !CheckMana(attacker, true))
        return;

      ClearCurrentAbility(attacker);

      attacker.SendLocalizedMessage(1063353); // You perform a masterful defense!

      attacker.FixedParticles(0x375A, 1, 17, 0x7F2, 0x3E8, 0x3, EffectLayer.Waist);

      int modifier =
        (int)(30.0 *
              ((Math.Max(attacker.Skills.Bushido.Value, attacker.Skills.Ninjitsu.Value) -
                50.0) / 70.0));

      if (m_Table.TryGetValue(attacker, out DefenseMasteryInfo info))
        EndDefense(info);

      ResistanceMod mod = new ResistanceMod(ResistanceType.Physical, 50 + modifier);
      attacker.AddResistanceMod(mod);

      info = new DefenseMasteryInfo(attacker, 80 - modifier, mod);
      info.m_Timer = Timer.DelayCall(TimeSpan.FromSeconds(3.0), EndDefense, info);

      m_Table[attacker] = info;

      attacker.Delta(MobileDelta.WeaponDamage);
    }

    public static bool GetMalus(Mobile targ, ref int damageMalus)
    {
      if (!m_Table.TryGetValue(targ, out DefenseMasteryInfo info))
        return false;

      damageMalus = info.m_DamageMalus;
      return true;
    }

    private static void EndDefense(DefenseMasteryInfo info)
    {
      if (info.m_Mod != null)
        info.m_From.RemoveResistanceMod(info.m_Mod);

      info.m_Timer?.Stop();

      // No message is sent to the player.

      m_Table.Remove(info.m_From);

      info.m_From.Delta(MobileDelta.WeaponDamage);
    }

    private class DefenseMasteryInfo
    {
      public int m_DamageMalus;
      public Mobile m_From;
      public ResistanceMod m_Mod;
      public Timer m_Timer;

      public DefenseMasteryInfo(Mobile from, int damageMalus, ResistanceMod mod)
      {
        m_From = from;
        m_DamageMalus = damageMalus;
        m_Mod = mod;
      }
    }
  }
}