using Server.Targeting;
using System;
using System.Collections.Generic;

namespace Server.Spells.Fourth
{
    public class ManaDrainSpell : MagerySpell
    {
        private static readonly SpellInfo m_Info = new SpellInfo(
            "Mana Drain", "Ort Rel",
            215,
            9031,
            Reagent.BlackPearl,
            Reagent.MandrakeRoot,
            Reagent.SpidersSilk);
        private static readonly Dictionary<Mobile, Timer> m_Table = new Dictionary<Mobile, Timer>();
        public ManaDrainSpell(Mobile caster, Item scroll)
            : base(caster, scroll, m_Info)
        {
        }

        public override SpellCircle Circle => SpellCircle.Fourth;
        public override void OnCast()
        {
            Caster.Target = new InternalTarget(this);
        }

        public void Target(Mobile m)
        {
            if (!Caster.CanSee(m))
            {
                Caster.SendLocalizedMessage(500237); // Target can not be seen.
            }
            else if (CheckHSequence(m))
            {
                SpellHelper.Turn(Caster, m);

                SpellHelper.CheckReflect(this, Caster, ref m);

                if (m.Spell != null)
                    m.Spell.OnCasterHurt();

                m.Paralyzed = false;

                int toDrain = 40 + (int)(GetDamageSkill(Caster) - GetResistSkill(m));

                if (toDrain < 0)
                    toDrain = 0;
                else if (toDrain > m.Mana)
                    toDrain = m.Mana;

                if (m_Table.ContainsKey(m))
                    toDrain = 0;

                m.FixedParticles(0x3789, 10, 25, 5032, EffectLayer.Head);
                m.PlaySound(0x1F8);

                if (toDrain > 0)
                {
                    m.Mana -= toDrain;

                    m_Table[m] = Timer.DelayCall(TimeSpan.FromSeconds(5.0), new TimerStateCallback(AosDelay_Callback), new object[] { m, toDrain });
                }

                HarmfulSpell(m);
            }

            FinishSequence();
        }

        public override double GetResistPercent(Mobile target)
        {
            return 99.0;
        }

        private void AosDelay_Callback(object state)
        {
            object[] states = (object[])state;

            Mobile m = (Mobile)states[0];
            int mana = (int)states[1];

            if (m.Alive && !m.IsDeadBondedPet)
            {
                m.Mana += mana;

                m.FixedEffect(0x3779, 10, 25);
                m.PlaySound(0x28E);
            }

            m_Table.Remove(m);
        }

        private class InternalTarget : Target
        {
            private readonly ManaDrainSpell m_Owner;
            public InternalTarget(ManaDrainSpell owner)
                : base(10, false, TargetFlags.Harmful)
            {
                m_Owner = owner;
            }

            protected override void OnTarget(Mobile from, object o)
            {
                if (o is Mobile)
                    m_Owner.Target((Mobile)o);
            }

            protected override void OnTargetFinish(Mobile from)
            {
                m_Owner.FinishSequence();
            }
        }
    }
}