using System;
using System.Collections;
using Server.Items;
using Server.Misc;
using Server.Mobiles;
using Server.Targeting;

namespace Server.Spells.Fourth
{
  public class FireFieldSpell : MagerySpell, ISpellTargetingPoint3D
  {
    private static SpellInfo m_Info = new SpellInfo(
      "Fire Field", "In Flam Grav",
      215,
      9041,
      false,
      Reagent.BlackPearl,
      Reagent.SpidersSilk,
      Reagent.SulfurousAsh
    );

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

    public override SpellCircle Circle => SpellCircle.Fourth;

    public override void OnCast()
    {
      Caster.Target = new SpellTargetPoint3D(this, TargetFlags.None, Core.ML ? 10 : 12);
    }

    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);

        SpellHelper.GetSurfaceTop(ref p);

        int dx = Caster.Location.X - p.X;
        int dy = Caster.Location.Y - p.Y;
        int rx = (dx - dy) * 44;
        int ry = (dx + dy) * 44;

        bool eastToWest;

        if (rx >= 0 && ry >= 0)
          eastToWest = false;
        else if (rx >= 0)
          eastToWest = true;
        else if (ry >= 0)
          eastToWest = true;
        else
          eastToWest = false;

        Effects.PlaySound(p, Caster.Map, 0x20C);

        int itemID = eastToWest ? 0x398C : 0x3996;

        TimeSpan duration;

        if (Core.AOS)
          duration = TimeSpan.FromSeconds((15 + Caster.Skills.Magery.Fixed / 5.0) / 4.0);
        else
          duration = TimeSpan.FromSeconds(4.0 + Caster.Skills.Magery.Value * 0.5);

        for (int i = -2; i <= 2; ++i)
        {
          Point3D loc = new Point3D(eastToWest ? p.X + i : p.X, eastToWest ? p.Y : p.Y + i, p.Z);

          new FireFieldItem(itemID, loc, Caster, Caster.Map, duration, i);
        }
      }

      FinishSequence();
    }

    [DispellableField]
    public class FireFieldItem : Item
    {
      private Mobile m_Caster;
      private int m_Damage;
      private DateTime m_End;
      private Timer m_Timer;

      public FireFieldItem(int itemID, Point3D loc, Mobile caster, Map map, TimeSpan duration, int val,
        int damage = 2) : base(itemID)
      {
        bool canFit = SpellHelper.AdjustField(ref loc, map, 12, false);

        Visible = false;
        Movable = false;
        Light = LightType.Circle300;

        MoveToWorld(loc, map);

        m_Caster = caster;

        m_Damage = damage;

        m_End = DateTime.UtcNow + duration;

        m_Timer = new InternalTimer(this, TimeSpan.FromSeconds(Math.Abs(val) * 0.2), caster.InLOS(this), canFit);
        m_Timer.Start();
      }

      public FireFieldItem(Serial serial) : base(serial)
      {
      }

      public override bool BlocksFit => true;

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

        m_Timer?.Stop();
      }

      public override void Serialize(IGenericWriter writer)
      {
        base.Serialize(writer);

        writer.Write(2); // version

        writer.Write(m_Damage);
        writer.Write(m_Caster);
        writer.WriteDeltaTime(m_End);
      }

      public override void Deserialize(IGenericReader reader)
      {
        base.Deserialize(reader);

        int version = reader.ReadInt();

        switch (version)
        {
          case 2:
          {
            m_Damage = reader.ReadInt();
            goto case 1;
          }
          case 1:
          {
            m_Caster = reader.ReadMobile();

            goto case 0;
          }
          case 0:
          {
            m_End = reader.ReadDeltaTime();

            m_Timer = new InternalTimer(this, TimeSpan.Zero, true, true);
            m_Timer.Start();

            break;
          }
        }

        if (version < 2)
          m_Damage = 2;
      }

      public override bool OnMoveOver(Mobile m)
      {
        if (Visible && m_Caster != null && (!Core.AOS || m != m_Caster) &&
            SpellHelper.ValidIndirectTarget(m_Caster, m) && m_Caster.CanBeHarmful(m, false))
        {
          if (SpellHelper.CanRevealCaster(m))
            m_Caster.RevealingAction();

          m_Caster.DoHarmful(m);

          int damage = m_Damage;

          if (!Core.AOS && m.CheckSkill(SkillName.MagicResist, 0.0, 30.0))
          {
            damage = 1;

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

          AOS.Damage(m, m_Caster, damage, 0, 100, 0, 0, 0);
          m.PlaySound(0x208);

          (m as BaseCreature)?.OnHarmfulSpell(m_Caster);
        }

        return true;
      }

      private class InternalTimer : Timer
      {
        private static Queue m_Queue = new Queue();
        private bool m_InLOS, m_CanFit;
        private FireFieldItem m_Item;

        public InternalTimer(FireFieldItem item, TimeSpan delay, bool inLOS, bool canFit) : base(delay,
          TimeSpan.FromSeconds(1.0))
        {
          m_Item = item;
          m_InLOS = inLOS;
          m_CanFit = canFit;

          Priority = TimerPriority.FiftyMS;
        }

        protected override void OnTick()
        {
          if (m_Item.Deleted)
            return;

          if (!m_Item.Visible)
          {
            if (m_InLOS && m_CanFit)
              m_Item.Visible = true;
            else
              m_Item.Delete();

            if (!m_Item.Deleted)
            {
              m_Item.ProcessDelta();
              Effects.SendLocationParticles(
                EffectItem.Create(m_Item.Location, m_Item.Map, EffectItem.DefaultDuration), 0x376A, 9, 10,
                5029);
            }
          }
          else if (DateTime.UtcNow > m_Item.m_End)
          {
            m_Item.Delete();
            Stop();
          }
          else
          {
            Map map = m_Item.Map;
            Mobile caster = m_Item.m_Caster;

            if (map == null || caster == null)
              return;

            foreach (Mobile m in m_Item.GetMobilesInRange(0))
              if (m.Z + 16 > m_Item.Z && m_Item.Z + 12 > m.Z && (!Core.AOS || m != caster) &&
                  SpellHelper.ValidIndirectTarget(caster, m) && caster.CanBeHarmful(m, false))
                m_Queue.Enqueue(m);

            while (m_Queue.Count > 0)
            {
              Mobile m = (Mobile)m_Queue.Dequeue();

              if (SpellHelper.CanRevealCaster(m))
                caster.RevealingAction();

              caster.DoHarmful(m);

              int damage = m_Item.m_Damage;

              if (!Core.AOS && m.CheckSkill(SkillName.MagicResist, 0.0, 30.0))
              {
                damage = 1;

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

              AOS.Damage(m, caster, damage, 0, 100, 0, 0, 0);
              m.PlaySound(0x208);

              (m as BaseCreature)?.OnHarmfulSpell(caster);
            }
          }
        }
      }
    }
  }
}