using System;
using System.Collections.Generic;
using Server.Mobiles;
using Server.Targeting;

namespace Server.Spells.Necromancy
{
  public class EvilOmenSpell : NecromancerSpell, ISpellTargetingMobile
  {
    private static SpellInfo m_Info = new SpellInfo(
      "Evil Omen", "Pas Tym An Sanct",
      203,
      9031,
      Reagent.BatWing,
      Reagent.NoxCrystal
    );

    private static Dictionary<Mobile, DefaultSkillMod> m_Table = new Dictionary<Mobile, DefaultSkillMod>();

    public EvilOmenSpell(Mobile caster, Item scroll = null)
      : base(caster, scroll, m_Info)
    {
    }

    public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(0.75);

    public override double RequiredSkill => 20.0;
    public override int RequiredMana => 11;

    public override void OnCast()
    {
      Caster.Target = new SpellTargetMobile(this, TargetFlags.Harmful, Core.ML ? 10 : 12);
    }

    public void Target(Mobile m)
    {
      if (!(m is BaseCreature || m is PlayerMobile))
        Caster.SendLocalizedMessage(1060508); // You can't curse that.
      else if (CheckHSequence(m))
      {
        SpellHelper.Turn(Caster, m);

        /* Curses the target so that the next harmful event that affects them is magnified.
         * Damage to the target's hit points is increased 25%,
         * the poison level of the attack will be 1 higher
         * and the Resist Magic skill of the target will be fixed on 50.
         *
         * The effect lasts for one harmful event only.
         */

        m.Spell?.OnCasterHurt();

        m.PlaySound(0xFC);
        m.FixedParticles(0x3728, 1, 13, 9912, 1150, 7, EffectLayer.Head);
        m.FixedParticles(0x3779, 1, 15, 9502, 67, 7, EffectLayer.Head);

        if (!m_Table.ContainsKey(m))
        {
          DefaultSkillMod mod = new DefaultSkillMod(SkillName.MagicResist, false, 50.0);

          if (m.Skills.MagicResist.Base > 50.0)
            m.AddSkillMod(mod);

          m_Table[m] = mod;
        }

        TimeSpan duration = TimeSpan.FromSeconds(Caster.Skills.SpiritSpeak.Value / 12 + 1.0);

        Timer.DelayCall(duration, mob => TryEndEffect(mob), m);

        HarmfulSpell(m);

        BuffInfo.AddBuff(m, new BuffInfo(BuffIcon.EvilOmen, 1075647, 1075648, duration, m));
      }

      FinishSequence();
    }

    public static bool TryEndEffect(Mobile m)
    {
      if (!m_Table.TryGetValue(m, out DefaultSkillMod mod))
        return false;

      m_Table.Remove(m);
      mod?.Remove();

      return true;
    }
  }
}