using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TibisMathematicsSuite.KeyboardIO
{
    public class MyKey
    {
        #region Data types
        [Flags]
        public enum Modifiers
        {
            None = 0x0, Alt = 0x1, Ctrl = 0x2, Shift = 0x4, Win = 0x8
        }
        #endregion

        #region Properties
        public Modifiers Mods { get; set; }
        public System.Windows.Forms.Keys Key { get; set; }

        public bool TestModifier(Modifiers m)
        {
            return ((this.Mods & m) > 0);
        }
        #endregion

        #region Constructors
        public MyKey()
        {
            Mods = Modifiers.None;
            Key = System.Windows.Forms.Keys.None;
        }

        public MyKey(System.Windows.Forms.Keys key)
        {
            Key = key;
            Mods = Modifiers.None;
        }

        public MyKey(System.Windows.Forms.Keys key, Modifiers mods)
        {
            Key = key;
            Mods = mods;
        }
        #endregion

        #region To and from string
        public static MyKey Parse(string str)
        {
            MyKey key = new MyKey();
            System.Windows.Forms.Keys temp;
            var keys = str.Split('+');

            foreach (var i in keys)
                switch (i)
                {
                    case "Alt": key.Mods |= Modifiers.Alt; break;
                    case "Ctrl": key.Mods |= Modifiers.Ctrl; break;
                    case "Shift": key.Mods |= Modifiers.Shift; break;
                    case "Win": key.Mods |= Modifiers.Win; break;
                    default: 
                        Enum.TryParse<System.Windows.Forms.Keys>(i, out temp);
                        key.Key = temp;
                        break;
                }

            return key;
        }

        public static string ToString(MyKey key)
        {
            StringBuilder str = new StringBuilder();

            if ((key.Mods & Modifiers.Win) != 0) str.Append("Win+");
            if ((key.Mods & Modifiers.Ctrl) != 0) str.Append("Ctrl+");
            if ((key.Mods & Modifiers.Alt) != 0) str.Append("Alt+");
            if ((key.Mods & Modifiers.Shift) != 0) str.Append("Shift+");

            str.Append(Enum.GetName(typeof(System.Windows.Forms.Keys), key.Key));
            return str.ToString();
        }

        public override string ToString()
        {
            return MyKey.ToString(this);
        }

        #endregion

        #region Overloads
        public override bool Equals(object obj)
        {
            MyKey b = obj as MyKey;
            if (b == null) return false;

            return (b.Key == this.Key && b.Mods == this.Mods);
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public static bool operator== (MyKey A, MyKey B)
        {
            if ((object)A == null || (object)B == null) return ((object)A == (object)B);

            return (A.Key == B.Key) && (A.Mods == B.Mods);
        }

        public static bool operator!=(MyKey A, MyKey B)
        {
            return !(A == B);
        }

        #endregion
    }
}