using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Threading;

namespace Qrakhen.Qamp.Editor.Controls;

public class Caret : Adorner
{
    private readonly Pen _pen;
    private readonly double _height;
    private readonly Brush _brush;
    private bool _blink;
    private Point _cursorPosition;
    private Point _targetPosition;
   private (Point from, Point to)[] _lines = [];
    private DispatcherTimer _blinkTimer;
    private DispatcherTimer _moveTimer;

    public Caret(UIElement adornedElement, Brush brush, double height = 18, double thickness = 1.72) : base(adornedElement)
    {
        IsHitTestVisible = false;

        _height = height;
        _brush = brush;
        _pen = new Pen(brush, 1.92);

        _blinkTimer = new DispatcherTimer();
        _blinkTimer.Interval = TimeSpan.FromMilliseconds(428);
        _blinkTimer.Tick += new EventHandler((s, e) => {
            Toggle(_blink = !_blink);
        });
        _blinkTimer.Start();

        _moveTimer = new DispatcherTimer();
        _moveTimer.Interval = TimeSpan.FromMilliseconds(12);
        _moveTimer.Tick += new EventHandler((s, e) => {
            var delta = _targetPosition - _cursorPosition;
            if (delta.Length > 2.4)
                _cursorPosition += delta * .84;
            else {
                _cursorPosition = _targetPosition;
                _moveTimer.Stop();
                _blinkTimer.Start();
            }
            InvalidateVisual();
        });
    }

    public void Toggle(bool hide)
    {
        _pen.Brush = hide ? Brushes.Transparent : _brush;
    }

   public void UpdateSelection((Point from, Point to)[] lines)
   {
      _lines = lines;
      InvalidateVisual();
   }

    public void UpdatePosition(Point newPosition)
    {
        _cursorPosition = _targetPosition = newPosition;
        Toggle(_blink = false);
        //_blinkTimer.Stop();
        //_moveTimer.Start();
        InvalidateVisual();
    }

    protected override void OnRender(DrawingContext drawingContext)
    {
        Point startPoint = new(_cursorPosition.X, _cursorPosition.Y);
        Point endPoint = new(_cursorPosition.X, _cursorPosition.Y + _height);
        drawingContext.DrawLine(_pen, startPoint, endPoint);
    }
}