using System;
using System.Collections;

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 readonly Hashtable m_Table = new Hashtable();

        public override int BaseMana => 20;

        public override SkillName GetSecondarySkill(Mobile from)
        {
            return from.Skills[SkillName.Ninjitsu].Base > from.Skills[SkillName.Bushido].Base ? SkillName.Ninjitsu : SkillName.Bushido;
        }

        public static bool GetMalus(Mobile targ, ref int damageMalus)
        {
            DefenseMasteryInfo info = m_Table[targ] as DefenseMasteryInfo;

            if (info == null)
                return false;

            damageMalus = info.m_DamageMalus;
            return true;
        }

        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[SkillName.Bushido].Value, attacker.Skills[SkillName.Ninjitsu].Value) - 50.0) / 70.0));

            DefenseMasteryInfo info = m_Table[attacker] as DefenseMasteryInfo;

            if (info != null)
                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), new TimerStateCallback(EndDefense), info);

            m_Table[attacker] = info;

            attacker.Delta(MobileDelta.WeaponDamage);
        }

        private static void EndDefense(object state)
        {
            DefenseMasteryInfo info = (DefenseMasteryInfo)state;

            if (info.m_Mod != null)
                info.m_From.RemoveResistanceMod(info.m_Mod);

            if (info.m_Timer != null)
                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 readonly Mobile m_From;
            public readonly int m_DamageMalus;
            public readonly ResistanceMod m_Mod;
            public Timer m_Timer;
            public DefenseMasteryInfo(Mobile from, int damageMalus, ResistanceMod mod)
            {
                m_From = from;
                m_DamageMalus = damageMalus;
                m_Mod = mod;
            }
        }
    }
}