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

namespace Ryujinx.Ava.Input
{
    internal static class AvaloniaKeyboardMappingHelper
    {
        private static readonly AvaKey[] _keyMapping =
        [
            // 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 AvaloniaKeyboardMappingHelper()
        {
            Key[] inputKeys = Enum.GetValues<Key>();

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

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

        public static bool TryGetAvaKey(Key key, out AvaKey avaKey)
        {
            avaKey = AvaKey.None;

            bool keyExist = (int)key < _keyMapping.Length;
            if (keyExist)
            {
                avaKey = _keyMapping[(int)key];
            }

            return keyExist;
        }

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