using System.Linq;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Input;
using static QuikDawEditor.EDITING.ShorcutKeys;

namespace QuikDawEditor
{
    public partial class KeyInputWindow : Window
    {
        public UserCommandKeyPair thisUserCommandKeyPair;
        public bool UserCommandKeyPairSet = false;

        internal PreferencesWindow myPrefWin;

        public KeyInputWindow(UserCommandKeyPair ucKeyPair, PreferencesWindow mPWin)
        {
            InitializeComponent();

            thisUserCommandKeyPair = ucKeyPair;
            FunctionNameTB.Text = ucKeyPair.CommandName;
            ShortcutKeyComboTB.Text = ucKeyPair.KeyGestureString;
            myPrefWin = mPWin;

        }

        private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Escape)  this.Close();
            
            //if (Keyboard.Modifiers == ModifierKeys.None) return;
            //if (Keyboard.Modifiers == ModifierKeys.Shift) return;

            if (Regex.IsMatch(e.Key.ToString(), @"(LeftCtrl|RightCtrl|LeftShift|RightShift|LeftAlt|RightAlt)"))
                return;

            string modString = "";
            modString += (Keyboard.IsKeyDown(Key.LeftCtrl) | Keyboard.IsKeyDown(Key.LeftCtrl)) ? "Ctrl+" : "";
            modString += (Keyboard.IsKeyDown(Key.LeftShift) | Keyboard.IsKeyDown(Key.RightShift))  ? "Shift+" : "";
            modString += (Keyboard.IsKeyDown(Key.LeftAlt) | Keyboard.IsKeyDown(Key.RightAlt))  ? "Alt+" : "";

            string newGestureString = modString + e.Key.ToString(); ;
            
            if (newGestureString.Contains("System"))
            {
                MessageBox.Show("Cannot use combination:\n\n" +  newGestureString + "\n\n(used by system)");
                return;
            }


            if (Regex.IsMatch(newGestureString, @"(Ctrl\+A$|Ctrl\+Z|Ctrl\+S|Ctrl\+Del|Del|Ctrl\+Home|Ctrl\+End|Enter|Space|R)"))
            {
                MessageBox.Show("Cannot use combination:\n\n" + newGestureString + "\n\n(used by QuikDaw)");
                return;
            }

            //Check if already assigned
            UserCommandKeyPair foundUCKP = myPrefWin.currentUserCommandKeyPairs.Where(uckp => uckp.KeyGestureString == newGestureString).FirstOrDefault();
            if (foundUCKP != null)
            {
                if (foundUCKP != thisUserCommandKeyPair)
                {
                    MessageBox.Show("Key combination already used by:\n" + foundUCKP.CommandName);
                    return;
                }
            }

            ShortcutKeyComboTB.Text = newGestureString;

        }

        private void CancelBut_Click(object sender, RoutedEventArgs e)
        {
            UserCommandKeyPairSet = false;
            this.Close();
        }

        private void OkBut_Click(object sender, RoutedEventArgs e)
        {
            thisUserCommandKeyPair = new UserCommandKeyPair(thisUserCommandKeyPair.CommandName + "=" + ShortcutKeyComboTB.Text);

            UserCommandKeyPairSet = true;
            this.Close();
        }
    }
}