using Server.Spells.SkillMasteries;
using Server.Targeting;
using System;
using System.Collections;

namespace Server.Spells.Necromancy
{
    public class BloodOathSpell : NecromancerSpell
    {
        private static readonly SpellInfo m_Info = new SpellInfo(
            "Blood Oath", "In Jux Mani Xen",
            203,
            9031,
            Reagent.DaemonBlood);
        private static readonly Hashtable m_OathTable = new Hashtable();
        private static readonly Hashtable m_Table = new Hashtable();
        public BloodOathSpell(Mobile caster, Item scroll)
            : base(caster, scroll, m_Info)
        {
        }

        public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(1.75);
        public override double RequiredSkill => 20.0;
        public override int RequiredMana => 13;
        public static bool RemoveCurse(Mobile m)
        {
            ExpireTimer t = (ExpireTimer)m_Table[m];

            if (t == null)
                return false;

            t.DoExpire();
            return true;
        }

        public static Mobile GetBloodOath(Mobile m)
        {
            if (m == null)
                return null;

            Mobile oath = (Mobile)m_OathTable[m];

            if (oath == m)
                oath = null;

            return oath;
        }

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

        public void Target(Mobile m)
        {
            if (Caster == m)
            {
                Caster.SendLocalizedMessage(1060508); // You can't curse that.
            }
            else if (m_OathTable.Contains(Caster))
            {
                Caster.SendLocalizedMessage(1061607); // You are already bonded in a Blood Oath.
            }
            else if (m_OathTable.Contains(m))
            {
                if (m.Player)
                    Caster.SendLocalizedMessage(1061608); // That player is already bonded in a Blood Oath.
                else
                    Caster.SendLocalizedMessage(1061609); // That creature is already bonded in a Blood Oath.
            }
            else if (CheckHSequence(m))
            {
                SpellHelper.Turn(Caster, m);

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

                ApplyEffects(m);
                ConduitSpell.CheckAffected(Caster, m, ApplyEffects);
            }

            FinishSequence();
        }

        public void ApplyEffects(Mobile m, double strength = 1.0)
        {
            /* Temporarily creates a dark pact between the caster and the target.
                * Any damage dealt by the target to the caster is increased, but the target receives the same amount of damage.
                * The effect lasts for ((Spirit Speak skill level - target's Resist Magic skill level) / 80 ) + 8 seconds.
                * 
                * NOTE: The above algorithm must be fixed point, it should be:
                * ((ss-rm)/8)+8
                */

            ExpireTimer timer = (ExpireTimer)m_Table[m];
            if (timer != null)
                timer.DoExpire();

            m_OathTable[Caster] = Caster;
            m_OathTable[m] = Caster;

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

            Caster.PlaySound(0x175);

            Caster.FixedParticles(0x375A, 1, 17, 9919, 33, 7, EffectLayer.Waist);
            Caster.FixedParticles(0x3728, 1, 13, 9502, 33, 7, (EffectLayer)255);

            m.FixedParticles(0x375A, 1, 17, 9919, 33, 7, EffectLayer.Waist);
            m.FixedParticles(0x3728, 1, 13, 9502, 33, 7, (EffectLayer)255);

            TimeSpan duration = TimeSpan.FromSeconds((((GetDamageSkill(Caster) - GetResistSkill(m)) / 8) + 8) * strength);
            m.CheckSkill(SkillName.MagicResist, 0.0, 120.0);	//Skill check for gain

            timer = new ExpireTimer(Caster, m, duration);
            timer.Start();

            BuffInfo.AddBuff(Caster, new BuffInfo(BuffIcon.BloodOathCaster, 1075659, duration, Caster, m.Name.ToString()));
            BuffInfo.AddBuff(m, new BuffInfo(BuffIcon.BloodOathCurse, 1075661, duration, m, Caster.Name.ToString()));

            m_Table[m] = timer;
            HarmfulSpell(m);
        }

        private class ExpireTimer : Timer
        {
            private readonly Mobile m_Caster;
            private readonly Mobile m_Target;
            private readonly DateTime m_End;
            public ExpireTimer(Mobile caster, Mobile target, TimeSpan delay)
                : base(TimeSpan.FromSeconds(1.0), TimeSpan.FromSeconds(1.0))
            {
                m_Caster = caster;
                m_Target = target;
                m_End = DateTime.UtcNow + delay;

                Priority = TimerPriority.TwoFiftyMS;
            }

            public void DoExpire()
            {
                if (m_OathTable.Contains(m_Caster))
                {
                    m_Caster.SendLocalizedMessage(1061620); // Your Blood Oath has been broken.
                    m_OathTable.Remove(m_Caster);
                }

                if (m_OathTable.Contains(m_Target))
                {
                    m_Target.SendLocalizedMessage(1061620); // Your Blood Oath has been broken.
                    m_OathTable.Remove(m_Target);
                }

                Stop();

                BuffInfo.RemoveBuff(m_Caster, BuffIcon.BloodOathCaster);
                BuffInfo.RemoveBuff(m_Target, BuffIcon.BloodOathCurse);

                m_Table.Remove(m_Caster);
            }

            protected override void OnTick()
            {
                if (m_Caster.Deleted || m_Target.Deleted || !m_Caster.Alive || !m_Target.Alive || DateTime.UtcNow >= m_End)
                {
                    DoExpire();
                }
            }
        }

        private class InternalTarget : Target
        {
            private readonly BloodOathSpell m_Owner;
            public InternalTarget(BloodOathSpell 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);
                else
                    from.SendLocalizedMessage(1060508); // You can't curse that.
            }

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