using System;

namespace Server.Commands.Generic
{
  public sealed class WhereExtension : BaseExtension
  {
    public static ExtensionInfo ExtInfo = new ExtensionInfo(20, "Where", -1, delegate { return new WhereExtension(); });

    public override ExtensionInfo Info => ExtInfo;

    public ObjectConditional Conditional{ get; private set; }

    public static void Initialize()
    {
      ExtensionInfo.Register(ExtInfo);
    }

    public override void Optimize(Mobile from, Type baseType, ref AssemblyEmitter assembly)
    {
      if (baseType == null)
        throw new InvalidOperationException("Insanity.");

      Conditional.Compile(ref assembly);
    }

    public override void Parse(Mobile from, string[] arguments, int offset, int size)
    {
      if (size < 1)
        throw new Exception("Invalid condition syntax.");

      Conditional = ObjectConditional.ParseDirect(from, arguments, offset, size);
    }

    public override bool IsValid(object obj)
    {
      return Conditional.CheckCondition(obj);
    }
  }
}