using System;
using Chernobyl.Collections.Generic.Event;
using Chernobyl.Values;

namespace Chernobyl.Mathematics.Movement
{
    /// <summary>
    /// Services related to Chernobyl.Mathematics.Movement.
    /// </summary>
    public interface IServices : IEventCollection<Object>
    {}

    /// <summary>
    /// Basic implementation of <see cref="IServices"/>.
    /// </summary>
    public class Services : DecoratingEventList<Object>, IServices
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="Services"/> class.
        /// </summary>
        public Services()
        {
            Add(new MatrixTransform.Factory());
        }
    }

    /// <summary>
    /// Extension and utility methods for <see cref="IServices"/>.
    /// </summary>
    public static class Extensions
    {
        /// <summary>
        /// Returns the services list for Chernobyl.Mathematics.Movement.
        /// </summary>
        /// <param name="services">The list to look into for the
        /// Chernobyl.Mathematics.Movement services list.</param>
        /// <returns>The services list for Chernobyl.Mathematics.Movement.</returns>
        public static IEventEnumerable<IServices> Movement(this IEventEnumerable<Object> services)
        {
            return services.OfType<IServices>();
        }
    }
}