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

namespace MrAG
{
    public class KeyBindings
    {
        public class KeyBinding
        {
            public Keys Key;
            public Delegate Press;
            public Delegate Release;
            public Delegate Hold;
            public int HoldInterval = 0;
            public double LastHold = 0;

            public bool Pressed;

            public KeyBinding(){}

            public KeyBinding(Keys Key)
            {
                this.Key = Key;
            }

            public void Call_Press()
            {
                if (Press == null) return;

                Press.DynamicInvoke();
            }

            public void Call_Release()
            {
                if (Release == null) return;

                Release.DynamicInvoke();
            }

            public void Call_Hold()
            {
                if (Hold == null) return;

                Hold.DynamicInvoke();
            }
        }

        private static List<KeyBinding> Bindings = new List<KeyBinding>();

        public static void Update(GameTime gameTime)
        {
            KeyboardState ks = Keyboard.GetState();

            foreach (KeyBinding binding in Bindings)
            {
                if (ks.IsKeyDown(binding.Key))
                {
                    if (!binding.Pressed)
                    {
                        binding.Call_Press();
                        binding.LastHold = gameTime.TotalGameTime.TotalMilliseconds;
                        binding.Pressed = true;
                    }else{
                        if (gameTime.TotalGameTime.TotalMilliseconds - binding.LastHold > binding.HoldInterval){
                            binding.LastHold = gameTime.TotalGameTime.TotalMilliseconds;
                            binding.Call_Hold();
                        }
                    }
                }else{
                    if (binding.Pressed){
                        binding.Pressed = false;
                        binding.Call_Release();
                    }
                }
            }
        }

        public static void Add(KeyBinding keyBinding)
        {
            Bindings.Add(keyBinding);
        }

        public static void Add(Keys KeyToPress, Action OnPress)
        {
            KeyBinding key = new MrAG.KeyBindings.KeyBinding(Keys.Left);

            key.Key = KeyToPress;
            key.Press = new Action(OnPress);
            Add(key);
        }

        public static void Add(Keys KeyToPress, Action OnHold, int HoldInterval)
        {
            KeyBinding key = new MrAG.KeyBindings.KeyBinding();

            key.Key = KeyToPress;
            key.Hold = OnHold;
            key.HoldInterval = HoldInterval;
            Add(key);
        }

        public static void Add(Keys KeyToPress, Action OnPress, Action OnHold, int HoldInterval)
        {
            KeyBinding key = new MrAG.KeyBindings.KeyBinding();

            key.Key = KeyToPress;
            key.Press = new Action(OnPress);
            key.Hold = OnHold;
            key.HoldInterval = HoldInterval;
            Add(key);
        }

        public static void Add(Keys KeyToPress, Action OnPress, Action OnRelease)
        {
            KeyBinding key = new MrAG.KeyBindings.KeyBinding();

            key.Key = KeyToPress;
            key.Press = new Action(OnPress);
            key.Release = new Action(OnRelease);
            Add(key);
        }

        public static void Add(Keys KeyToPress, Action OnPress, Action OnHold, int HoldInterval, Action OnRelease)
        {
            KeyBinding key = new MrAG.KeyBindings.KeyBinding();

            key.Key = KeyToPress;
            key.Press = new Action(OnPress);
            key.Release = new Action(OnRelease);
            key.Hold = OnHold;
            key.HoldInterval = HoldInterval;
            Add(key);
        }

        public static void Remove(Keys Key)
        {
            foreach (KeyBinding binding in Bindings)
            {
                if (binding.Key == Key)
                    Bindings.Remove(binding);
            }
        }
    }
}