using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework.Input;

namespace SuperPolarity
{
    static class InputController
    {
        static Dictionary<string, List<Action<float>>> Listeners;
        static Dictionary<string, List<Keys>> RegisteredKeys;
        static Dictionary<string, List<Buttons>> RegisteredButtons;

        static GamePadState InputGamePadState;
        static KeyboardState InputKeyboardState;

        /*
         * Registered Events.
         * 
         * You register: name of the event (ie. attack) and a key associated with it.
         * or button... Left Stick /always/ dispatches move event.
         */

        static InputController()
        {
            Listeners = new Dictionary<string,List<Action<float>>>();
            InputKeyboardState = new KeyboardState();
            InputGamePadState = new GamePadState();
        }

        public static void UpdateInput()
        {
            Poll();
            DispatchMoveEvents();
            DispatchRegisteredEvents();
        }

        private static void Poll()
        {
            InputGamePadState = GamePad.GetState(Microsoft.Xna.Framework.PlayerIndex.One);
            InputKeyboardState = Keyboard.GetState();
        }

        private static void DispatchRegisteredEvents()
        {
        }

        private static void DispatchMoveEvents()
        {
            float xMovement = 0.0f;
            float yMovement = 0.0f;
            // Dispatch the moveX / MoveY events every frame.

            xMovement = InputGamePadState.ThumbSticks.Left.X;
            yMovement = -InputGamePadState.ThumbSticks.Left.Y;

            Console.WriteLine("Dispatching Input {0}", InputKeyboardState.IsKeyDown(Keys.Left));

            if (InputKeyboardState.IsKeyDown(Keys.Left))
            {
                xMovement = -1.0f;
            }

            if (InputKeyboardState.IsKeyDown(Keys.Right))
            {
                xMovement = 1.0f;
            }

            if (InputKeyboardState.IsKeyDown(Keys.Up))
            {
                yMovement = -1.0f;
            }

            if (InputKeyboardState.IsKeyDown(Keys.Down))
            {
                yMovement = 1.0f;
            }

            Dispatch("moveX", xMovement);
            Dispatch("moveY", yMovement);
        }

        public static void Bind(string eventName, Action<float> listener)
        {
            List<Action<float>> newListenerList;
            List<Action<float>> listenerList;
            bool               foundListeners;

            if (!Listeners.ContainsKey(eventName)) {
               newListenerList = new List<Action<float>>();
               Listeners.Add(eventName, newListenerList);
            }

            foundListeners = Listeners.TryGetValue(eventName, out listenerList);

            listenerList.Add(listener);
        }

        public static void Dispatch(string eventName, float value)
        {
            List<Action<float>> listenerList;
            bool foundListeners;

            foundListeners = Listeners.TryGetValue(eventName, out listenerList);

            if (!foundListeners)
            {
                return;
            }

            foreach (Action<float> method in listenerList)
            {
                method(value);
            }
        }
    }
}