using System.Windows.Input;

namespace JD.Core
{
    /// <summary>
    /// Helper class to convert the key codes in C# to the matching key code for the UAF engine. 
    /// Check InputAdapter.h in engine for the correct input codes. 
    /// </summary>
    public class EngineKeyCodeConverter
    {
        static EngineKeyCodeConverter()
        {
            Instance = new EngineKeyCodeConverter();
        }

        public static EngineKeyCodeConverter Instance { get; }

        protected EngineKeyCodeConverter()
        {

        }

        public uint ConvertKeyCode(Key key)
        {
            switch (key)
            {
                case Key.Space: return 32;
                case Key.Escape: return 257;
                case Key.Up: return 283;
                case Key.Down: return 284;
                case Key.Left: return 285;
                case Key.Right: return 286;
                case Key.LeftShift: return 287;
                case Key.RightShift: return 288;
                case Key.LeftCtrl: return 289;
                case Key.RightCtrl: return 290;
                case Key.LeftAlt: return 291;
                case Key.RightAlt: return 292;
                case Key.Tab: return 293;
                case Key.Enter: return 294;
                case Key.Back: return 295;
                case Key.Insert: return 296;
                case Key.Delete: return 297;
                case Key.PageUp: return 298;
                case Key.PageDown: return 299;
                case Key.Home: return 300;
                case Key.End: return 301;
                case Key.Divide: return 312;
                case Key.Multiply: return 313;
                case Key.Subtract: return 314;
                case Key.Add: return 315;
                case Key.Decimal: return 316;
                case Key.PrintScreen: return 319;
                    
                default:
                    {
                        if (key >= Key.D0 && key <= Key.D9)
                            return (uint)(48 + key - Key.D0);
                        if (key >= Key.A && key <= Key.Z)
                            return (uint)(65 + key - Key.A);
                        if (key >= Key.F1 && key <= Key.F24)
                            return (uint)(258 + key - Key.F1);
                        if (key >= Key.NumPad0 && key <= Key.NumPad9)
                            return (uint)(302 + key - Key.NumPad0);
                        return (uint)key;
                    }
            }
        }

        public uint ConvertModifiersKeyCode(ModifierKeys modifiers)
        {
            uint modifiersCode = 0;
            if ((modifiers & ModifierKeys.Control) == ModifierKeys.Control)
                modifiersCode += 1;
            if ((modifiers & ModifierKeys.Alt) == ModifierKeys.Alt)
                modifiersCode += 2;
            if ((modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
                modifiersCode += 4;
            return modifiersCode;
        }
    }
}