using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace FastReport.Utils
{
    public partial class Converter
    {
        internal static Dictionary<Keys, string> ValidShortcutKeys = new Dictionary<Keys, string>()
        {
            { Keys.ShiftKey, "Shift" },
            { Keys.ControlKey, "Ctrl" },
            { Keys.Menu, "Alt" },
            { Keys.LShiftKey, "LShift" },
            { Keys.RShiftKey, "RShift" },
            { Keys.LControlKey, "LCtrl" },
            { Keys.RControlKey, "RCtrl" },
            { Keys.LMenu, "LAlt" },
            { Keys.RMenu, "RAlt" },
            { Keys.A, "A" },
            { Keys.B, "B" },
            { Keys.C, "C" },
            { Keys.D, "D" },
            { Keys.D0, "0" },
            { Keys.D1, "1" },
            { Keys.D2, "2" },
            { Keys.D3, "3" },
            { Keys.D4, "4" },
            { Keys.D5, "5" },
            { Keys.D6, "6" },
            { Keys.D7, "7" },
            { Keys.D8, "8" },
            { Keys.D9, "9" },
            { Keys.Delete, "Delete" },
            { Keys.Down, "Down" },
            { Keys.E, "E" },
            { Keys.End, "End" },
            { Keys.F, "F" },
            { Keys.F1, "F1" },
            { Keys.F10, "F10" },
            { Keys.F11, "F11" },
            { Keys.F12, "F12" },
            { Keys.F13, "F13" },
            { Keys.F14, "F14" },
            { Keys.F15, "F15" },
            { Keys.F16, "F16" },
            { Keys.F17, "F17" },
            { Keys.F18, "F18" },
            { Keys.F19, "F19" },
            { Keys.F2, "F2" },
            { Keys.F20, "F20" },
            { Keys.F21, "F21" },
            { Keys.F22, "F22" },
            { Keys.F23, "F23" },
            { Keys.F24, "F24" },
            { Keys.F3, "F3" },
            { Keys.F4, "F4" },
            { Keys.F5, "F5" },
            { Keys.F6, "F6" },
            { Keys.F7, "F7" },
            { Keys.F8, "F8" },
            { Keys.F9, "F9" },
            { Keys.G, "G" },
            { Keys.H, "H" },
            { Keys.I, "I" },
            { Keys.Insert, "Insert" },
            { Keys.J, "J" },
            { Keys.K, "K" },
            { Keys.L, "L" },
            { Keys.Left, "Left" },
            { Keys.M, "M" },
            { Keys.N, "N" },
            { Keys.NumLock, "NumLock" },
            { Keys.NumPad0, "NumPad0" },
            { Keys.NumPad1, "NumPad1" },
            { Keys.NumPad2, "NumPad2" },
            { Keys.NumPad3, "NumPad3" },
            { Keys.NumPad4, "NumPad4" },
            { Keys.NumPad5, "NumPad5" },
            { Keys.NumPad6, "NumPad6" },
            { Keys.NumPad7, "NumPad7" },
            { Keys.NumPad8, "NumPad8" },
            { Keys.NumPad9, "NumPad9" },
            { Keys.O, "O" },
            { Keys.OemBackslash, "\\" },
            { Keys.OemClear, "Clear" },
            { Keys.OemCloseBrackets, "]" },
            { Keys.Oemcomma, "," },
            { Keys.OemMinus, "-" },
            { Keys.OemOpenBrackets, "[" },
            { Keys.OemPeriod, "." },
            { Keys.OemPipe, "|" },
            { Keys.Oemplus, "+" },
            { Keys.OemQuestion, "?" },
            { Keys.OemQuotes, "\"" },
            { Keys.OemSemicolon, ";" },
            { Keys.Oemtilde, "~" },
            { Keys.P, "P" },
            { Keys.Pause, "Pause" },
            { Keys.Q, "Q" },
            { Keys.R, "R" },
            { Keys.Right, "Right" },
            { Keys.S, "S" },
            { Keys.Space, "Space" },
            { Keys.T, "T" },
            { Keys.Tab, "Tab" },
            { Keys.U, "U" },
            { Keys.Up, "Up" },
            { Keys.V, "V" },
            { Keys.W, "W" },
            { Keys.X, "X" },
            { Keys.Y, "Y" },
            { Keys.Z, "Z" },
            { Keys.Alt, "Alt" },
            { Keys.Shift, "Shift" },
            { Keys.Control, "Ctrl" },
        };

        internal static string ShortcutKeysToStr(Keys key)
        {
            List<string> result = new List<string>();

            var keys = ValidShortcutKeys.Keys.ToList();
            keys.Sort();
            keys.Reverse();

            foreach (var k in keys)
            {
                if (key.HasFlag(k))
                {
                    result.Add(ValidShortcutKeys[k]);
                    key &= ~k;
                }
            }

            if (key != Keys.None)
                result.Add(key.ToString());
            else if (result.Count == 0)
                result.Add("None");

            if (result.Contains("LShift") || result.Contains("RShift") || result.FindAll((string s) => s == "Shift").Count > 1)
                result.Remove("Shift");
            if (result.Contains("LCtrl") || result.Contains("RCtrl") || result.FindAll((string s) => s == "Ctrl").Count > 1)
                result.Remove("Ctrl");
            if (result.Contains("LAlt") || result.Contains("RAlt") || result.FindAll((string s) => s == "Alt").Count > 1)
                result.Remove("Alt");

            return string.Join(" + ", result.ToArray());
        }
    }
}