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

namespace Server.Spells.Seventh
{
  public class ChainLightningSpell : MagerySpell
  {
    private static SpellInfo m_Info = new SpellInfo(
      "Chain Lightning", "Vas Ort Grav",
      209,
      9022,
      false,
      Reagent.BlackPearl,
      Reagent.Bloodmoss,
      Reagent.MandrakeRoot,
      Reagent.SulfurousAsh
    );

    public ChainLightningSpell(Mobile caster, Item scroll) : base(caster, scroll, m_Info)
    {
    }

    public override SpellCircle Circle => SpellCircle.Seventh;

    public override bool DelayedDamage => true;

    public override void OnCast()
    {
      Caster.Target = new InternalTarget(this);
    }

    public void Target(IPoint3D p)
    {
      if (!Caster.CanSee(p))
      {
        Caster.SendLocalizedMessage(500237); // Target can not be seen.
      }
      else if (SpellHelper.CheckTown(p, Caster) && CheckSequence())
      {
        SpellHelper.Turn(Caster, p);

        if (p is Item)
          p = ((Item)p).GetWorldLocation();

        List<Mobile> targets = new List<Mobile>();

        Map map = Caster.Map;

        bool playerVsPlayer = false;

        if (map != null)
        {
          IPooledEnumerable<Mobile> eable = map.GetMobilesInRange(new Point3D(p), 2);

          foreach (Mobile m in eable)
          {
            if (Core.AOS && m == Caster)
              continue;

            if (SpellHelper.ValidIndirectTarget(Caster, m) && Caster.CanBeHarmful(m, false))
            {
              if (Core.AOS && !Caster.InLOS(m))
                continue;

              targets.Add(m);

              if (m.Player)
                playerVsPlayer = true;
            }
          }

          eable.Free();
        }

        double damage;

        if (Core.AOS)
          damage = GetNewAosDamage(51, 1, 5, playerVsPlayer);
        else
          damage = Utility.Random(27, 22);

        if (targets.Count > 0)
        {
          if (Core.AOS && targets.Count > 2)
            damage = damage * 2 / targets.Count;
          else if (!Core.AOS)
            damage /= targets.Count;

          double toDeal;
          for (int i = 0; i < targets.Count; ++i)
          {
            toDeal = damage;
            Mobile m = targets[i];

            if (!Core.AOS && CheckResisted(m))
            {
              toDeal *= 0.5;

              m.SendLocalizedMessage(501783); // You feel yourself resisting magical energy.
            }

            toDeal *= GetDamageScalar(m);
            Caster.DoHarmful(m);
            SpellHelper.Damage(this, m, toDeal, 0, 0, 0, 0, 100);

            m.BoltEffect(0);
          }
        }
        else
        {
          Caster.PlaySound(0x29);
        }
      }

      FinishSequence();
    }

    private class InternalTarget : Target
    {
      private ChainLightningSpell m_Owner;

      public InternalTarget(ChainLightningSpell owner) : base(Core.ML ? 10 : 12, true, TargetFlags.None)
      {
        m_Owner = owner;
      }

      protected override void OnTarget(Mobile from, object o)
      {
        IPoint3D p = o as IPoint3D;

        if (p != null)
          m_Owner.Target(p);
      }

      protected override void OnTargetFinish(Mobile from)
      {
        m_Owner.FinishSequence();
      }
    }
  }
}