using System;
using System.Collections.Generic;

namespace Server.Items
{
  public class HitLower
  {
    public static readonly TimeSpan AttackEffectDuration = TimeSpan.FromSeconds(10.0);
    public static readonly TimeSpan DefenseEffectDuration = TimeSpan.FromSeconds(8.0);

    private static HashSet<Mobile> m_AttackTable = new HashSet<Mobile>();
    private static HashSet<Mobile> m_DefenseTable = new HashSet<Mobile>();

    public static bool IsUnderAttackEffect(Mobile m) => m_AttackTable.Contains(m);

    public static bool ApplyAttack(Mobile m)
    {
      if (IsUnderAttackEffect(m))
        return false;

      m_AttackTable.Add(m);
      AttackTimer timer = new AttackTimer(m);
      timer.Start();
      m.SendLocalizedMessage(1062319); // Your attack chance has been reduced!
      return true;
    }

    private static void RemoveAttack(Mobile m)
    {
      m_AttackTable.Remove(m);
      m.SendLocalizedMessage(1062320); // Your attack chance has returned to normal.
    }

    public static bool IsUnderDefenseEffect(Mobile m) => m_DefenseTable.Contains(m);

    public static bool ApplyDefense(Mobile m)
    {
      if (IsUnderDefenseEffect(m))
        return false;

      m_DefenseTable.Add(m);
      DefenseTimer timer = new DefenseTimer(m);
      timer.Start();
      m.SendLocalizedMessage(1062318); // Your defense chance has been reduced!
      return true;
    }

    private static void RemoveDefense(Mobile m)
    {
      m_DefenseTable.Remove(m);
      m.SendLocalizedMessage(1062321); // Your defense chance has returned to normal.
    }

    private class AttackTimer : Timer
    {
      private Mobile m_Player;

      public AttackTimer(Mobile player) : base(AttackEffectDuration)
      {
        m_Player = player;
        Priority = TimerPriority.TwoFiftyMS;
      }

      protected override void OnTick()
      {
        RemoveAttack(m_Player);
      }
    }

    private class DefenseTimer : Timer
    {
      private Mobile m_Player;

      public DefenseTimer(Mobile player) : base(DefenseEffectDuration)
      {
        m_Player = player;
        Priority = TimerPriority.TwoFiftyMS;
      }

      protected override void OnTick()
      {
        RemoveDefense(m_Player);
      }
    }
  }
}