using System;
using System.Collections;
using Server.Spells;

namespace Server.Items
{
	/// <summary>
	/// A quick attack to all enemies in range of your weapon that causes damage over time. Requires Bushido or Ninjitsu skill.
	/// </summary>
	public class FrenziedWhirlwind : WeaponAbility
	{
		public FrenziedWhirlwind()
		{
		}

		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 int BaseMana => 30;

		private static Hashtable m_Registry = new Hashtable();
		public static Hashtable Registry  => m_Registry;

		public override void OnHit( Mobile attacker, Mobile defender, int damage )
		{
			if ( !Validate( attacker ) )	//Mana check after check that there are targets
				return;

			ClearCurrentAbility( attacker );

			Map map = attacker.Map;

			if ( map == null )
				return;

			if ( !(attacker.Weapon is BaseWeapon weapon) )
				return;

			ArrayList list = new ArrayList();

			foreach( Mobile m in attacker.GetMobilesInRange( 1 ) )
				list.Add( m );

			ArrayList targets = new ArrayList();

			for( int i = 0; i < list.Count; ++i )
			{
				Mobile m = (Mobile)list[i];

				if ( m != defender && m != attacker && SpellHelper.ValidIndirectTarget( attacker, m ) )
				{
					if ( m == null || m.Deleted || m.Map != attacker.Map || !m.Alive || !attacker.CanSee( m ) || !attacker.CanBeHarmful( m ) )
						continue;

					if ( !attacker.InRange( m, weapon.MaxRange ) )
						continue;

					if ( attacker.InLOS( m ) )
						targets.Add( m );
				}
			}

			if ( targets.Count > 0 )
			{
				if ( !CheckMana( attacker, true ) )
					return;

				attacker.FixedEffect( 0x3728, 10, 15 );
				attacker.PlaySound( 0x2A1 );

				// 5-15 damage
				int amount = (int)(10.0 * ((Math.Max( attacker.Skills[SkillName.Bushido].Value, attacker.Skills[SkillName.Ninjitsu].Value ) - 50.0) / 70.0 + 5));

				for( int i = 0; i < targets.Count; ++i )
				{
					Mobile m = (Mobile)targets[i];
					attacker.DoHarmful( m, true );

					if ( Registry[m] is Timer t )
					{
						t.Stop();
						Registry.Remove( m );
					}

					t = new InternalTimer( attacker, m, amount );
					t.Start();
					Registry.Add( m, t );
				}

				Timer.DelayCall( TimeSpan.FromSeconds( 2.0 ), new TimerStateCallback( RepeatEffect ), attacker );
			}
		}

		private void RepeatEffect( object state )
		{
			Mobile attacker = (Mobile)state;

			attacker.FixedEffect( 0x3728, 10, 15 );
			attacker.PlaySound( 0x2A1 );
		}

		private class InternalTimer : Timer
		{
			private Mobile m_Attacker;
			private Mobile m_Defender;
			private double m_DamageRemaining;
			private double m_DamageToDo;

			private readonly double DamagePerTick;

			public InternalTimer( Mobile attacker, Mobile defender, int totalDamage )
				: base( TimeSpan.Zero, TimeSpan.FromSeconds( 0.25 ), 12 )	// 3 seconds at .25 seconds apart = 12.  Confirm delay inbetween of .25 each.
			{
				m_Attacker = attacker;
				m_Defender = defender;

				m_DamageRemaining = (double)totalDamage;
				DamagePerTick = (double)totalDamage / 12 + 0.01;

				Priority = TimerPriority.TwentyFiveMS;
			}

			protected override void OnTick()
			{
				if ( !m_Defender.Alive || m_DamageRemaining <= 0 )
				{
					Stop();
					Registry.Remove( m_Defender );
					return;
				}

				m_DamageRemaining -= DamagePerTick;
				m_DamageToDo += DamagePerTick;

				if ( m_DamageRemaining <= 0 && m_DamageToDo < 1 )
					m_DamageToDo = 1.0; //Confirm this 'round up' at the end

				int damage = (int)m_DamageToDo;

				if ( damage > 0 )
				{
					m_Defender.Damage( damage, m_Attacker );
					m_DamageToDo -= damage;
				}

				if ( !m_Defender.Alive || m_DamageRemaining <= 0 )
				{
					Stop();
					Registry.Remove( m_Defender );
				}
			}
		}
	}
}