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

namespace Server.Spells.Spellweaving
{
  public class GiftOfLifeSpell : ArcanistSpell, ISpellTargetingMobile
  {
    private static SpellInfo m_Info = new SpellInfo(
      "Gift of Life", "Illorae",
      -1
    );

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

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

    public override TimeSpan CastDelayBase => TimeSpan.FromSeconds(4.0);

    public override double RequiredSkill => 38.0;
    public override int RequiredMana => 70;

    public double HitsScalar => (Caster.Skills.Spellweaving.Value / 2.4 + FocusLevel) / 100;

    public static void Initialize()
    {
      EventSink.PlayerDeath += delegate(PlayerDeathEventArgs e) { HandleDeath(e.Mobile); };
    }

    public override void OnCast()
    {
      Caster.Target = new SpellTargetMobile(this, TargetFlags.Beneficial, 10);
    }

    public void Target(Mobile m)
    {
      if (m == null)
        Caster.SendLocalizedMessage(1072077); // You may only cast this spell on yourself or a bonded pet.
      else if (!Caster.CanSee(m))
        Caster.SendLocalizedMessage(500237); // Target can not be seen.
      else if (m.IsDeadBondedPet || !m.Alive)
      {
        // As per Osi: Nothing happens.
      }
      else if (m != Caster && !(m is BaseCreature bc && bc.IsBonded && bc.ControlMaster == Caster))
        Caster.SendLocalizedMessage(1072077); // You may only cast this spell on yourself or a bonded pet.
      else if (m_Table.ContainsKey(m))
        Caster.SendLocalizedMessage(501775); // This spell is already in effect.
      else if (CheckBSequence(m))
      {
        if (Caster == m)
        {
          Caster.SendLocalizedMessage(1074774); // You weave powerful magic, protecting yourself from death.
        }
        else
        {
          Caster.SendLocalizedMessage(1074775); // You weave powerful magic, protecting your pet from death.
          SpellHelper.Turn(Caster, m);
        }


        m.PlaySound(0x244);
        m.FixedParticles(0x3709, 1, 30, 0x26ED, 5, 2, EffectLayer.Waist);
        m.FixedParticles(0x376A, 1, 30, 0x251E, 5, 3, EffectLayer.Waist);

        double skill = Caster.Skills.Spellweaving.Value;

        TimeSpan duration = TimeSpan.FromMinutes((int)(skill / 24) * 2 + FocusLevel);

        ExpireTimer t = new ExpireTimer(m, duration, this);
        t.Start();

        m_Table[m] = t;

        BuffInfo.AddBuff(m, new BuffInfo(BuffIcon.GiftOfLife, 1031615, 1075807, duration, m, null, true));
      }

      FinishSequence();
    }

    public static void HandleDeath(Mobile m)
    {
      if (m_Table.ContainsKey(m))
        Timer.DelayCall(TimeSpan.FromSeconds(Utility.RandomMinMax(2, 4)), HandleDeath_OnCallback, m);
    }

    private static void HandleDeath_OnCallback(Mobile m)
    {
      if (!m_Table.TryGetValue(m, out ExpireTimer timer))
        return;

      double hitsScalar = timer.Spell.HitsScalar;

      if (m is BaseCreature pet && pet.IsDeadBondedPet)
      {
        Mobile master = pet.GetMaster();

        if (master?.NetState != null && Utility.InUpdateRange(pet, master))
        {
          master.CloseGump<PetResurrectGump>();
          master.SendGump(new PetResurrectGump(master, pet, hitsScalar));
        }
        else
        {
          List<Mobile> friends = pet.Friends;

          for (int i = 0; friends != null && i < friends.Count; i++)
          {
            Mobile friend = friends[i];

            if (friend.NetState != null && Utility.InUpdateRange(pet, friend))
            {
              friend.CloseGump<PetResurrectGump>();
              friend.SendGump(new PetResurrectGump(friend, pet));
              break;
            }
          }
        }
      }
      else
      {
        m.CloseGump<ResurrectGump>();
        m.SendGump(new ResurrectGump(m, hitsScalar));
      }

      //Per OSI, buff is removed when gump sent, irregardless of online status or acceptance
      timer.DoExpire();
    }

    public static void OnLogin(LoginEventArgs e)
    {
      Mobile m = e.Mobile;

      if (m == null || m.Alive || m_Table[m] == null)
        return;

      HandleDeath_OnCallback(m);
    }

    private class ExpireTimer : Timer
    {
      private Mobile m_Mobile;

      public ExpireTimer(Mobile m, TimeSpan delay, GiftOfLifeSpell spell)
        : base(delay)
      {
        m_Mobile = m;
        Spell = spell;
      }

      public GiftOfLifeSpell Spell{ get; }

      protected override void OnTick()
      {
        DoExpire();
      }

      public void DoExpire()
      {
        Stop();

        m_Mobile.SendLocalizedMessage(1074776); // You are no longer protected with Gift of Life.
        m_Table.Remove(m_Mobile);

        BuffInfo.RemoveBuff(m_Mobile, BuffIcon.GiftOfLife);
      }
    }
  }
}