using System;
using System.Collections.Generic;
using System.Reflection;

namespace Cryville.Common.Unity.Input {
	public class InputManager {
		static readonly HashSet<Type> HandlerRegistries = new HashSet<Type> {
			typeof(WindowsPointerHandler),
			typeof(UnityKeyHandler<UnityKeyboardReceiver>),
			typeof(UnityKeyHandler<UnityMouseButtonReceiver>),
			typeof(UnityMouseHandler),
			typeof(UnityTouchHandler),
		};
		readonly HashSet<InputHandler> _handlers = new HashSet<InputHandler>();
		readonly Dictionary<Type, InputHandler> _typemap = new Dictionary<Type, InputHandler>();
		public InputManager() {
			foreach (var t in HandlerRegistries) {
				try {
					if (!typeof(InputHandler).IsAssignableFrom(t)) continue;
					var h = (InputHandler)ReflectionHelper.InvokeEmptyConstructor(t);
					_typemap.Add(t, h);
					_handlers.Add(h);
					Logger.Log("main", 1, "Input", "Initialized {0}", ReflectionHelper.GetSimpleName(t));
				}
				catch (TargetInvocationException ex) {
					Logger.Log("main", 1, "Input", "Cannot initialize {0}: {1}", ReflectionHelper.GetSimpleName(t), ex.InnerException.Message);
				}
			}
		}
		public InputHandler GetHandler(string name) {
			return _typemap[Type.GetType(name)];
		}
		public void EnumerateHandlers(Action<InputHandler> cb) {
			foreach (var h in _handlers) cb(h);
		}
	}

	public struct InputEvent {
		public InputIdentifier Id { get; set; }
		public InputVector From { get; set; }
		public InputVector To { get; set; }
		public override string ToString() {
			return string.Format("[{0}] {1} -> {2}", Id, From, To);
		}
	}
}