using System;
using Server.Targeting;
using Server.Mobiles;

namespace Server.Spells.Necromancy
{
	public class VengefulSpiritSpell : NecromancerSpell
	{
		private static SpellInfo m_Info = new SpellInfo(
				"Vengeful Spirit", "Kal Xen Bal Beh",
				203,
				9031,
				Reagent.BatWing,
				Reagent.GraveDust,
				Reagent.PigIron
			);

		public override TimeSpan CastDelayBase => TimeSpan.FromSeconds( 2.0 );

		public override double RequiredSkill => 80.0;
		public override int RequiredMana => 41;

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

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

		public override bool CheckCast()
		{
			if ( !base.CheckCast() )
				return false;

			if ( (Caster.Followers + 3) > Caster.FollowersMax )
			{
				Caster.SendLocalizedMessage( 1049645 ); // You have too many followers to summon that creature.
				return false;
			}

			return true;
		}

		public void Target( Mobile m )
		{
			if ( Caster == m )
			{
				Caster.SendLocalizedMessage( 1061832 ); // You cannot exact vengeance on yourself.
			}
			else if ( CheckHSequence( m ) )
			{
				SpellHelper.Turn( Caster, m );

				/* Summons a Revenant which haunts the target until either the target or the Revenant is dead.
				 * Revenants have the ability to track down their targets wherever they may travel.
				 * A Revenant's strength is determined by the Necromancy and Spirit Speak skills of the Caster.
				 * The effect lasts for ((Spirit Speak skill level * 80) / 120) + 10 seconds.
				 */

				TimeSpan duration = TimeSpan.FromSeconds( ((GetDamageSkill( Caster ) * 80) / 120) + 10 );

				Revenant rev = new Revenant( Caster, m, duration );

				if ( BaseCreature.Summon( rev, false, Caster, m.Location, 0x81, TimeSpan.FromSeconds( duration.TotalSeconds + 2.0 ) ) )
					rev.FixedParticles( 0x373A, 1, 15, 9909, EffectLayer.Waist );
			}

			FinishSequence();
		}

		private class InternalTarget : Target
		{
			private VengefulSpiritSpell m_Owner;

			public InternalTarget( VengefulSpiritSpell owner ) : base( Core.ML ? 10 : 12, 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();
			}
		}
	}
}