using System;
using System.Collections.Generic;
using Server.Items;

namespace Server.Mobiles
{
  public class KhaldunRevenant : BaseCreature
  {
    private static HashSet<Mobile> m_Set = new HashSet<Mobile>();
    private DateTime m_ExpireTime;

    private Mobile m_Target;

    public KhaldunRevenant(Mobile target) : base(AIType.AI_Melee, FightMode.Closest, 10, 1, 0.18, 0.36)
    {
      Body = 0x3CA;
      Hue = 0x41CE;

      m_Target = target;
      m_ExpireTime = DateTime.UtcNow + TimeSpan.FromMinutes(10.0);

      SetStr(401, 500);
      SetDex(296, 315);
      SetInt(101, 200);

      SetHits(241, 300);
      SetStam(242, 280);

      SetDamage(20, 30);

      SetDamageType(ResistanceType.Physical, 50);
      SetDamageType(ResistanceType.Cold, 50);

      SetSkill(SkillName.MagicResist, 100.1, 150.0);
      SetSkill(SkillName.Tactics, 90.1, 100.0);
      SetSkill(SkillName.Swords, 140.1, 150.0);
      SetSkill(SkillName.Wrestling, 90.1, 100.0);

      SetResistance(ResistanceType.Physical, 55, 65);
      SetResistance(ResistanceType.Fire, 30, 40);
      SetResistance(ResistanceType.Cold, 60, 70);
      SetResistance(ResistanceType.Poison, 20, 30);
      SetResistance(ResistanceType.Energy, 20, 30);

      Fame = 0;
      Karma = 0;

      VirtualArmor = 60;

      Halberd weapon = new Halberd { Hue = 0x41CE, Movable = false };

      AddItem(weapon);
    }

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

    public override bool DeleteCorpseOnDeath => true;

    public override Mobile ConstantFocus => m_Target;
    public override bool AlwaysAttackable => true;

    public override string DefaultName => "a revenant";

    public override bool BardImmune => true;
    public override Poison PoisonImmune => Poison.Lethal;

    public static void Initialize()
    {
      EventSink.PlayerDeath += EventSink_PlayerDeath;
    }

    public static void EventSink_PlayerDeath(PlayerDeathEventArgs e)
    {
      Mobile m = e.Mobile;
      Mobile lastKiller = m.LastKiller;

      if (lastKiller is BaseCreature creature)
        lastKiller = creature.GetMaster();

      if (IsInsideKhaldun(m) && IsInsideKhaldun(lastKiller) && lastKiller.Player && !m_Set.Contains(lastKiller))
        foreach (AggressorInfo ai in m.Aggressors)
          if (ai.Attacker == lastKiller && ai.CanReportMurder)
          {
            SummonRevenant(m, lastKiller);
            break;
          }
    }

    public static void SummonRevenant(Mobile victim, Mobile killer)
    {
      KhaldunRevenant revenant = new KhaldunRevenant(killer);

      revenant.MoveToWorld(victim.Location, victim.Map);
      revenant.Combatant = killer;
      revenant.FixedParticles(0, 0, 0, 0x13A7, EffectLayer.Waist);
      Effects.PlaySound(revenant.Location, revenant.Map, 0x29);

      m_Set.Add(killer);
    }

    public static bool IsInsideKhaldun(Mobile from)
    {
      return from?.Region?.IsPartOf("Khaldun") == true;
    }

    public override void DisplayPaperdollTo(Mobile to)
    {
    }

    public override int GetIdleSound()
    {
      return 0x1BF;
    }

    public override int GetAngerSound()
    {
      return 0x107;
    }

    public override int GetDeathSound()
    {
      return 0xFD;
    }

    public override void OnThink()
    {
      if (!m_Target.Alive || DateTime.UtcNow > m_ExpireTime)
      {
        Delete();
        return;
      }

      //Combatant = m_Target;
      //FocusMob = m_Target;

      if (AIObject != null)
        AIObject.Action = ActionType.Combat;

      base.OnThink();
    }

    public override bool OnBeforeDeath()
    {
      Effects.SendLocationEffect(Location, Map, 0x376A, 10, 1);
      return true;
    }

    public override void OnDelete()
    {
      if (m_Target != null)
        m_Set.Remove(m_Target);

      base.OnDelete();
    }

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

      writer.Write(0);
    }

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

      int version = reader.ReadInt();

      Delete();
    }
  }
}