using System;
using Server;
using Server.Items;
using Server.Spells;
using Server.Spells.Necromancy;

namespace Server.Misc
{
	public class RegenRates
	{
		[CallPriority( 10 )]
		public static void Configure()
		{
			Mobile.DefaultHitsRate = TimeSpan.FromSeconds( 11.0 );
			Mobile.DefaultStamRate = TimeSpan.FromSeconds(  7.0 );
			Mobile.DefaultManaRate = TimeSpan.FromSeconds(  7.0 );

			Mobile.ManaRegenRateHandler = new RegenRateHandler( Mobile_ManaRegenRate );

			if ( Core.AOS )
			{
				Mobile.StamRegenRateHandler = new RegenRateHandler( Mobile_StamRegenRate );
				Mobile.HitsRegenRateHandler = new RegenRateHandler( Mobile_HitsRegenRate );
			}
		}

		private static void CheckBonusSkill( Mobile m, int cur, int max, SkillName skill )
		{
			if ( !m.Alive )
				return;

			double n = (double)cur / max;
			double v = Math.Sqrt( m.Skills[skill].Value * 0.005 );

			n *= (1.0 - v);
			n += v;

			m.CheckSkill( skill, n );
		}

		private static bool CheckTransform( Mobile m, Type type )
		{
			return TransformationSpell.UnderTransformation( m, type );
		}

		private static TimeSpan Mobile_HitsRegenRate( Mobile from )
		{
			int points = AosAttributes.GetValue( from, AosAttribute.RegenHits );

			if ( from is Mobiles.BaseCreature && !((Mobiles.BaseCreature)from).IsAnimatedDead )
				points += 4;

			if ( from is Mobiles.BaseCreature && ((Mobiles.BaseCreature)from).IsParagon )
				points += 40;

			if ( CheckTransform( from, typeof( HorrificBeastSpell ) ) )
				points += 20;

			if ( points < 0 )
				points = 0;

			return TimeSpan.FromSeconds( 1.0 / (0.1 * (1 + points)) );
		}

		private static TimeSpan Mobile_StamRegenRate( Mobile from )
		{
			if ( from.Skills == null )
				return Mobile.DefaultStamRate;

			CheckBonusSkill( from, from.Stam, from.StamMax, SkillName.Focus );

			int points = AosAttributes.GetValue( from, AosAttribute.RegenStam ) +
				(int)(from.Skills[SkillName.Focus].Value * 0.1);

			if ( CheckTransform( from, typeof( VampiricEmbraceSpell ) ) )
				points += 15;

			if ( from is Mobiles.BaseCreature && ((Mobiles.BaseCreature)from).IsParagon )
				points += 40;

			if ( points < -1 )
				points = -1;

			return TimeSpan.FromSeconds( 1.0 / (0.1 * (2 + points)) );
		}

		private static TimeSpan Mobile_ManaRegenRate( Mobile from )
		{
			if ( from.Skills == null )
				return Mobile.DefaultManaRate;

			if ( !from.Meditating )
				CheckBonusSkill( from, from.Mana, from.ManaMax, SkillName.Meditation );

			double rate;
			double armorPenalty = GetArmorOffset( from );

			if ( Core.AOS )
			{
				double medPoints = from.Int + (from.Skills[SkillName.Meditation].Value * 3);

				medPoints *= ( from.Skills[SkillName.Meditation].Value < 100.0 ) ? 0.025 : 0.0275;

				CheckBonusSkill( from, from.Mana, from.ManaMax, SkillName.Focus );

				double focusPoints = (int)(from.Skills[SkillName.Focus].Value * 0.05);

				if ( armorPenalty > 0 )
					medPoints = 0; // In AOS, wearing any meditation-blocking armor completely removes meditation bonus

				double totalPoints = AosAttributes.GetValue( from, AosAttribute.RegenMana ) +
					focusPoints + medPoints + (from.Meditating ? (medPoints > 13.0 ? 13.0 : medPoints) : 0.0);

				if ( CheckTransform( from, typeof( VampiricEmbraceSpell ) ) )
					totalPoints += 3;
				else if ( CheckTransform( from, typeof( LichFormSpell ) ) )
					totalPoints += 13;

				if ( from is Mobiles.BaseCreature && ((Mobiles.BaseCreature)from).IsParagon )
					totalPoints += 40;

				if ( totalPoints < -1 )
					totalPoints = -1;

				rate = 1.0 / (0.1 * (2 + (int)totalPoints));
			}
			else
			{
				double medPoints = (from.Int + from.Skills[SkillName.Meditation].Value) * 0.5;

				if ( medPoints <= 0 )
					rate = 7.0;
				else if ( medPoints <= 100 )
					rate = 7.0 - (239*medPoints/2400) + (19*medPoints*medPoints/48000);
				else if ( medPoints < 120 )
					rate = 1.0;
				else
					rate = 0.75;

				rate += armorPenalty;

				if ( from.Meditating )
					rate *= 0.5;

				if ( rate < 0.5 )
					rate = 0.5;
				else if ( rate > 7.0 )
					rate = 7.0;
			}

			return TimeSpan.FromSeconds( rate );
		}

		private static double GetArmorOffset( Mobile from )
		{
			double rating = 0.0;

			if ( !Core.AOS )
				rating += GetArmorMeditationValue( from.ShieldArmor as BaseArmor );

			rating += GetArmorMeditationValue( from.NeckArmor as BaseArmor );
			rating += GetArmorMeditationValue( from.HandArmor as BaseArmor );
			rating += GetArmorMeditationValue( from.HeadArmor as BaseArmor );
			rating += GetArmorMeditationValue( from.ArmsArmor as BaseArmor );
			rating += GetArmorMeditationValue( from.LegsArmor as BaseArmor );
			rating += GetArmorMeditationValue( from.ChestArmor as BaseArmor );

			return rating / 4;
		}

		private static double GetArmorMeditationValue( BaseArmor ar )
		{
			if ( ar == null || ar.ArmorAttributes.MageArmor != 0 || ar.Attributes.SpellChanneling != 0 )
				return 0.0;

			switch ( ar.MeditationAllowance )
			{
				default:
				case ArmorMeditationAllowance.None: return ar.BaseArmorRatingScaled;
				case ArmorMeditationAllowance.Half: return ar.BaseArmorRatingScaled / 2.0;
				case ArmorMeditationAllowance.All:  return 0.0;
			}
		}
	}
}