using System;
using System.Linq;
using Server.Network;

namespace Server.Items
{
  public class RaiseSwitch : Item
  {
    private ResetTimer m_ResetTimer;

    public RaiseSwitch(int itemID = 0x1093) : base(itemID)
    {
      Movable = false;
    }

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

    [CommandProperty(AccessLevel.GameMaster)]
    public RaisableItem RaisableItem{ get; set; }

    public override void OnDoubleClick(Mobile m)
    {
      if (!m.InRange(this, 2))
      {
        m.LocalOverheadMessage(MessageType.Regular, 0x3B2, 1019045); // I can't reach that.
        return;
      }

      if (RaisableItem?.Deleted == true)
        RaisableItem = null;

      Flip();

      if (RaisableItem == null)
        return;

      if (RaisableItem.IsRaisable)
      {
        RaisableItem.Raise();
        m.LocalOverheadMessage(MessageType.Regular, 0x5A, true,
          "You hear a grinding noise echoing in the distance.");
      }
      else
      {
        m.LocalOverheadMessage(MessageType.Regular, 0x5A, true,
          "You flip the switch again, but nothing happens.");
      }
    }

    protected virtual void Flip()
    {
      if (ItemID != 0x1093)
      {
        ItemID = 0x1093;

        StopResetTimer();
      }
      else
      {
        ItemID = 0x1095;

        StartResetTimer(RaisableItem?.CloseDelay >= TimeSpan.Zero ? RaisableItem.CloseDelay : TimeSpan.FromMinutes(2.0));
      }

      Effects.PlaySound(Location, Map, 0x3E8);
    }

    protected void StartResetTimer(TimeSpan delay)
    {
      StopResetTimer();

      m_ResetTimer = new ResetTimer(this, delay);
      m_ResetTimer.Start();
    }

    protected void StopResetTimer()
    {
      if (m_ResetTimer != null)
      {
        m_ResetTimer.Stop();
        m_ResetTimer = null;
      }
    }

    protected virtual void Reset()
    {
      if (ItemID != 0x1093)
        Flip();
    }

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

      writer.WriteEncodedInt(0); // version

      writer.Write(RaisableItem);
    }

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

      int version = reader.ReadEncodedInt();

      RaisableItem = (RaisableItem)reader.ReadItem();

      Reset();
    }

    private class ResetTimer : Timer
    {
      private RaiseSwitch m_RaiseSwitch;

      public ResetTimer(RaiseSwitch raiseSwitch, TimeSpan delay) : base(delay)
      {
        m_RaiseSwitch = raiseSwitch;

        Priority = ComputePriority(delay);
      }

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

        m_RaiseSwitch.m_ResetTimer = null;

        m_RaiseSwitch.Reset();
      }
    }
  }

  public class DisappearingRaiseSwitch : RaiseSwitch
  {
    [Constructible]
    public DisappearingRaiseSwitch() : base(0x108F)
    {
    }

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

    public int CurrentRange => Visible ? 3 : 2;

    public override bool HandlesOnMovement => true;

    protected override void Flip()
    {
    }

    protected override void Reset()
    {
    }

    public override void OnMovement(Mobile m, Point3D oldLocation)
    {
      if (Utility.InRange(m.Location, Location, CurrentRange) || Utility.InRange(oldLocation, Location, CurrentRange))
        Refresh();
    }

    public override void OnMapChange()
    {
      if (!Deleted)
        Refresh();
    }

    public override void OnLocationChange(Point3D oldLoc)
    {
      if (!Deleted)
        Refresh();
    }

    public void Refresh()
    {
      Visible = GetMobilesInRange(CurrentRange).Any(mob => !mob.Hidden || mob.AccessLevel <= AccessLevel.Player);
    }

    public override void Serialize(GenericWriter writer)
    {
      if (RaisableItem?.Deleted == true)
        RaisableItem = null;

      base.Serialize(writer);

      writer.WriteEncodedInt(0); // version
    }

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

      int version = reader.ReadEncodedInt();

      Timer.DelayCall(TimeSpan.Zero, Refresh);
    }
  }
}