using System.Collections.Generic;
using Chernobyl.Collections.Generic.Event;
using Chernobyl.Input.Controls;
using Chernobyl.Plugin;

namespace Chernobyl.Input
{
    /// <summary>
    /// The plug-in that sets up the input functionality for Chernobyl.
    /// </summary>
    public class InputPlugin : DecoratingEventList<object>, IPlugin
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="services">The <see cref="IEventCollection{T}"/> instance that 
        /// gives and takes services.</param>
        public InputPlugin(IEventCollection<object> services)
        {
            Services = services;
            services.Add(this);
            
            Add(_gamepads);
        }

        /// <summary>
        /// The services provided by this plug-in or null if no services are
        /// provided.
        /// </summary>
        public IEventCollection<object> Services { get; private set; }

        /// <summary>
        /// The <see cref="IGamepad"/> instances currently plugged into the
        /// device and are available for use. The 
        /// <see cref="IEventEnumerable{T}.ItemsAdded"/> and 
        /// <see cref="IEventEnumerable{T}.ItemsRemoved"/> can be used to know
        /// when a device has been connected or disconnected from the machine.
        /// </summary>
        readonly IEventCollection<IGamepad> _gamepads = new DecoratingEventCollection<IGamepad>(new List<IGamepad>());
    }
}