using System;
using Server.Items;
using Server.Mobiles;
using Server.Engines.MLQuests;

namespace Server.Spells.Spellweaving
{
	public abstract class ArcanistSpell : Spell
	{
		public abstract double RequiredSkill { get; }
		public abstract int RequiredMana { get; }

		public override SkillName CastSkill => SkillName.Spellweaving;
		public override SkillName DamageSkill => SkillName.Spellweaving;

		public override bool ClearHandsOnCast => false;

		private int m_CastTimeFocusLevel;

		public ArcanistSpell( Mobile caster, Item scroll, SpellInfo info )
			: base( caster, scroll, info )
		{
		}

		public virtual int FocusLevel => m_CastTimeFocusLevel;

		public static int GetFocusLevel( Mobile from )
		{
			ArcaneFocus focus = FindArcaneFocus( from );

			if ( focus == null || focus.Deleted )
				return 0;

			return focus.StrengthBonus;
		}

		public static ArcaneFocus FindArcaneFocus( Mobile from )
		{
			if ( @from?.Backpack == null )
				return null;

			if ( from.Holding is ArcaneFocus )
				return (ArcaneFocus)from.Holding;

			return from.Backpack.FindItemByType<ArcaneFocus>();
		}

		public static bool CheckExpansion( Mobile from )
		{
			if ( !(from is PlayerMobile) )
				return true;

			if ( from.NetState == null )
				return false;

			return from.NetState.SupportsExpansion( Expansion.ML );
		}

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

			Mobile caster = Caster;

			if ( !CheckExpansion( caster ) )
			{
				caster.SendLocalizedMessage( 1072176 ); // You must upgrade to the Mondain's Legacy Expansion Pack before using that ability
				return false;
			}

			if ( caster is PlayerMobile )
			{
				MLQuestContext context = MLQuestSystem.GetContext( (PlayerMobile)caster );

				if ( context == null || !context.Spellweaving )
				{
					caster.SendLocalizedMessage( 1073220 ); // You must have completed the epic arcanist quest to use this ability.
					return false;
				}
			}

			int mana = ScaleMana( RequiredMana );

			if ( caster.Mana < mana )
			{
				caster.SendLocalizedMessage( 1060174, mana.ToString() ); // You must have at least ~1_MANA_REQUIREMENT~ Mana to use this ability.
				return false;
			}
			else if ( caster.Skills[CastSkill].Value < RequiredSkill )
			{
				caster.SendLocalizedMessage( 1063013, $"{RequiredSkill.ToString("F1")}\t{"#1044114"}"); // You need at least ~1_SKILL_REQUIREMENT~ ~2_SKILL_NAME~ skill to use that ability.
				return false;
			}

			return true;
		}

		public override void GetCastSkills( out double min, out double max )
		{
			min = RequiredSkill - 12.5;	//per 5 on Friday, 2/16/07
			max = RequiredSkill + 37.5;
		}

		public override int GetMana()
		{
			return RequiredMana;
		}

		public override void DoFizzle()
		{
			Caster.PlaySound( 0x1D6 );
			Caster.NextSpellTime = Core.TickCount;
		}

		public override void DoHurtFizzle()
		{
			Caster.PlaySound( 0x1D6 );
		}

		public override void OnDisturb( DisturbType type, bool message )
		{
			base.OnDisturb( type, message );

			if ( message )
				Caster.PlaySound( 0x1D6 );
		}

		public override void OnBeginCast()
		{
			base.OnBeginCast();

			SendCastEffect();
			m_CastTimeFocusLevel = GetFocusLevel( Caster );
		}

		public virtual void SendCastEffect()
		{
			Caster.FixedEffect( 0x37C4, 10, (int)(GetCastDelay().TotalSeconds * 28), 4, 3 );
		}

		public virtual bool CheckResisted( Mobile m )
		{
			double percent = (50 + 2*(GetResistSkill( m ) - GetDamageSkill( Caster )))/100;	//TODO: According to the guide this is it.. but.. is it correct per OSI?

			if ( percent <= 0 )
				return false;

			if ( percent >= 1.0 )
				return true;

			return (percent >= Utility.RandomDouble());
		}
	}
}