using Ryujinx.Input;
using System;
using System.Collections.Generic;
using AvaKey = Avalonia.Input.Key;

namespace Ryujinx.Ava.Input
{
    public static class AvaloniaMappingHelper
    {
        private static readonly AvaKey[] _keyMapping = new AvaKey[(int)Key.Count]
        {
            // NOTE: Invalid
            AvaKey.None,

            AvaKey.LeftShift,
            AvaKey.RightShift,
            AvaKey.LeftCtrl,
            AvaKey.RightCtrl,
            AvaKey.LeftAlt,
            AvaKey.RightAlt,
            AvaKey.LWin,
            AvaKey.RWin,
            AvaKey.Apps,
            AvaKey.F1,
            AvaKey.F2,
            AvaKey.F3,
            AvaKey.F4,
            AvaKey.F5,
            AvaKey.F6,
            AvaKey.F7,
            AvaKey.F8,
            AvaKey.F9,
            AvaKey.F10,
            AvaKey.F11,
            AvaKey.F12,
            AvaKey.F13,
            AvaKey.F14,
            AvaKey.F15,
            AvaKey.F16,
            AvaKey.F17,
            AvaKey.F18,
            AvaKey.F19,
            AvaKey.F20,
            AvaKey.F21,
            AvaKey.F22,
            AvaKey.F23,
            AvaKey.F24,

            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,
            AvaKey.None,

            AvaKey.Up,
            AvaKey.Down,
            AvaKey.Left,
            AvaKey.Right,
            AvaKey.Return,
            AvaKey.Escape,
            AvaKey.Space,
            AvaKey.Tab,
            AvaKey.Back,
            AvaKey.Insert,
            AvaKey.Delete,
            AvaKey.PageUp,
            AvaKey.PageDown,
            AvaKey.Home,
            AvaKey.End,
            AvaKey.CapsLock,
            AvaKey.Scroll,
            AvaKey.Print,
            AvaKey.Pause,
            AvaKey.NumLock,
            AvaKey.Clear,
            AvaKey.NumPad0,
            AvaKey.NumPad1,
            AvaKey.NumPad2,
            AvaKey.NumPad3,
            AvaKey.NumPad4,
            AvaKey.NumPad5,
            AvaKey.NumPad6,
            AvaKey.NumPad7,
            AvaKey.NumPad8,
            AvaKey.NumPad9,
            AvaKey.Divide,
            AvaKey.Multiply,
            AvaKey.Subtract,
            AvaKey.Add,
            AvaKey.Decimal,
            AvaKey.Enter,
            AvaKey.A,
            AvaKey.B,
            AvaKey.C,
            AvaKey.D,
            AvaKey.E,
            AvaKey.F,
            AvaKey.G,
            AvaKey.H,
            AvaKey.I,
            AvaKey.J,
            AvaKey.K,
            AvaKey.L,
            AvaKey.M,
            AvaKey.N,
            AvaKey.O,
            AvaKey.P,
            AvaKey.Q,
            AvaKey.R,
            AvaKey.S,
            AvaKey.T,
            AvaKey.U,
            AvaKey.V,
            AvaKey.W,
            AvaKey.X,
            AvaKey.Y,
            AvaKey.Z,
            AvaKey.D0,
            AvaKey.D1,
            AvaKey.D2,
            AvaKey.D3,
            AvaKey.D4,
            AvaKey.D5,
            AvaKey.D6,
            AvaKey.D7,
            AvaKey.D8,
            AvaKey.D9,
            AvaKey.OemTilde,
            AvaKey.OemTilde,AvaKey.OemMinus,
            AvaKey.OemPlus,
            AvaKey.OemOpenBrackets,
            AvaKey.OemCloseBrackets,
            AvaKey.OemSemicolon,
            AvaKey.OemQuotes,
            AvaKey.OemComma,
            AvaKey.OemPeriod,
            AvaKey.OemQuestion,
            AvaKey.OemBackslash,

            // NOTE: invalid
            AvaKey.None
        };

        private static readonly Dictionary<AvaKey, Key> _avaKeyMapping;

        static AvaloniaMappingHelper()
        {
            var inputKeys = Enum.GetValues(typeof(Key));

            // Avalonia.Input.Key is not contiguous and quite large, so use a dictionary instead of an array.
            _avaKeyMapping = new Dictionary<AvaKey, Key>();

            foreach (var key in inputKeys)
            {
                if (TryGetAvaKey((Key)key, out var index))
                {
                    _avaKeyMapping[index] = (Key)key;
                }
            }
        }

        public static bool TryGetAvaKey(Key key, out AvaKey avaKey)
        {
            var keyExist = (int)key < _keyMapping.Length;
            if (keyExist)
            {
                avaKey = _keyMapping[(int)key];
            }
            else
            {
                avaKey = AvaKey.None;
            }

            return keyExist;
        }

        public static Key ToInputKey(AvaKey key)
        {
            return _avaKeyMapping.GetValueOrDefault(key, Key.Unknown);
        }
    }
}