using System;
using System.Collections.Frozen;
using System.Collections.Generic;
using Robust.Shared.Localization;

namespace Robust.Client.Input
{
    public static class Mouse
    {
        /// <summary>
        ///     Represents one of three mouse buttons.
        /// </summary>
        public enum Button : byte
        {
            Left = 1,
            Middle = 2,
            Right = 3,
            Button4,
            Button5,
            Button6,
            Button7,
            Button8,
            Button9,
            LastButton,
        }

        public static Keyboard.Key MouseButtonToKey(Button button)
        {
            return _mouseKeyMap[button];
        }

        private static readonly FrozenDictionary<Button, Keyboard.Key> _mouseKeyMap = new Dictionary<Button, Keyboard.Key>()
        {
            {Button.Left, Keyboard.Key.MouseLeft},
            {Button.Middle, Keyboard.Key.MouseMiddle},
            {Button.Right, Keyboard.Key.MouseRight},
            {Button.Button4, Keyboard.Key.MouseButton4},
            {Button.Button5, Keyboard.Key.MouseButton5},
            {Button.Button6, Keyboard.Key.MouseButton6},
            {Button.Button7, Keyboard.Key.MouseButton7},
            {Button.Button8, Keyboard.Key.MouseButton8},
            {Button.Button9, Keyboard.Key.MouseButton9},
            {Button.LastButton, Keyboard.Key.Unknown},
        }.ToFrozenDictionary();

    }

    public static class Keyboard
    {
        /// <summary>
        ///     Represents a key on the keyboard.
        /// </summary>
        // This enum HAS to be a byte for the input system bitflag fuckery to work.
        public enum Key : byte
        {
            Unknown = 0,
            MouseLeft,
            MouseRight,
            MouseMiddle,
            MouseButton4,
            MouseButton5,
            MouseButton6,
            MouseButton7,
            MouseButton8,
            MouseButton9,
            A,
            B,
            C,
            D,
            E,
            F,
            G,
            H,
            I,
            J,
            K,
            L,
            M,
            N,
            O,
            P,
            Q,
            R,
            S,
            T,
            U,
            V,
            W,
            X,
            Y,
            Z,
            Num0,
            Num1,
            Num2,
            Num3,
            Num4,
            Num5,
            Num6,
            Num7,
            Num8,
            Num9,
            NumpadNum0,
            NumpadNum1,
            NumpadNum2,
            NumpadNum3,
            NumpadNum4,
            NumpadNum5,
            NumpadNum6,
            NumpadNum7,
            NumpadNum8,
            NumpadNum9,
            Escape,
            Control,
            Shift,
            Alt,
            LSystem,
            RSystem,
            Menu,
            LBracket,
            RBracket,
            SemiColon,
            Comma,
            Period,
            Apostrophe,
            Slash,
            BackSlash,
            Tilde,
            Equal,
            Space,
            Return,
            NumpadEnter,
            BackSpace,
            Tab,
            PageUp,
            PageDown,
            End,
            Home,
            Insert,
            Delete,
            Minus,
            NumpadAdd,
            NumpadSubtract,
            NumpadDivide,
            NumpadMultiply,
            NumpadDecimal,
            Left,
            Right,
            Up,
            Down,
            F1,
            F2,
            F3,
            F4,
            F5,
            F6,
            F7,
            F8,
            F9,
            F10,
            F11,
            F12,
            F13,
            F14,
            F15,
            F16,
            F17,
            F18,
            F19,
            F20,
            F21,
            F22,
            F23,
            F24,
            Pause,
            World1,
            CapsLock,
            ScrollLock,
            Help,
            Stop,
            Again,
            Props,
            Undo,
            Cut,
            Copy,
            Open,
            Paste,
            Find,
        }

        public static bool IsMouseKey(this Key key)
        {
            return key >= Key.MouseLeft && key <= Key.MouseButton9;
        }

        /// <summary>
        ///     Gets a "nice" version of special unprintable keys such as <see cref="Key.Escape"/>.
        /// </summary>
        /// <returns><see langword="null"/> if there is no nice version of this special key.</returns>
        internal static string? GetSpecialKeyName(Key key, ILocalizationManager loc)
        {
            var locId = $"input-key-{key}";
            if (key == Key.LSystem || key == Key.RSystem)
            {
                if (OperatingSystem.IsWindows())
                    locId += "-win";
                else if (OperatingSystem.IsMacOS())
                    locId += "-mac";
                else
                    locId += "-linux";
            }

#if MACOS
            if (key == Key.Alt)
            {
                locId += "-mac";
            }
#endif

            if (loc.TryGetString(locId, out var name))
                return name;

            return null;
        }
    }
}