using System;
using Server.Items;
using Server.Misc;

namespace Server.SkillHandlers
{
  internal class Meditation
  {
    public static void Initialize()
    {
      SkillInfo.Table[46].Callback = OnUse;
    }

    public static bool CheckOkayHolding(Item item)
    {
      if (item == null)
        return true;

      if (item is Spellbook || item is Runebook)
        return true;

      if (Core.AOS && item is BaseWeapon weapon && weapon.Attributes.SpellChanneling != 0)
        return true;

      if (Core.AOS && item is BaseArmor armor && armor.Attributes.SpellChanneling != 0)
        return true;

      return false;
    }

    public static TimeSpan OnUse(Mobile m)
    {
      m.RevealingAction();

      if (m.Target != null)
      {
        m.SendLocalizedMessage(501845); // You are busy doing something else and cannot focus.

        return TimeSpan.FromSeconds(5.0);
      }

      if (!Core.AOS && m.Hits < m.HitsMax / 10) // Less than 10% health
      {
        m.SendLocalizedMessage(501849); // The mind is strong but the body is weak.

        return TimeSpan.FromSeconds(5.0);
      }

      if (m.Mana >= m.ManaMax)
      {
        m.SendLocalizedMessage(501846); // You are at peace.

        return TimeSpan.FromSeconds(Core.AOS ? 10.0 : 5.0);
      }

      if (Core.AOS && RegenRates.GetArmorOffset(m) > 0)
      {
        m.SendLocalizedMessage(500135); // Regenerative forces cannot penetrate your armor!

        return TimeSpan.FromSeconds(10.0);
      }

      Item oneHanded = m.FindItemOnLayer(Layer.OneHanded);
      Item twoHanded = m.FindItemOnLayer(Layer.TwoHanded);

      if (Core.AOS && m.Player)
      {
        if (!CheckOkayHolding(oneHanded))
          m.AddToBackpack(oneHanded);

        if (!CheckOkayHolding(twoHanded))
          m.AddToBackpack(twoHanded);
      }
      else if (!CheckOkayHolding(oneHanded) || !CheckOkayHolding(twoHanded))
      {
        m.SendLocalizedMessage(502626); // Your hands must be free to cast spells or meditate.

        return TimeSpan.FromSeconds(2.5);
      }

      double skillVal = m.Skills.Meditation.Value;
      double chance = (50.0 + (skillVal - (m.ManaMax - m.Mana)) * 2) / 100;

      if (chance > Utility.RandomDouble())
      {
        m.CheckSkill(SkillName.Meditation, 0.0, 100.0);

        m.SendLocalizedMessage(501851); // You enter a meditative trance.
        m.Meditating = true;
        BuffInfo.AddBuff(m, new BuffInfo(BuffIcon.ActiveMeditation, 1075657));

        if (m.Player || m.Body.IsHuman)
          m.PlaySound(0xF9);
      }
      else
      {
        m.SendLocalizedMessage(501850); // You cannot focus your concentration.
      }

      return TimeSpan.FromSeconds(10.0);
    }
  }
}