import 'package:flutter/material.dart';

class TrackpadWidget extends StatefulWidget {
  final Function(String type, Map<String, double> values) onUpdate;

  TrackpadWidget({required this.onUpdate});

  @override
  _TrackpadWidgetState createState() => _TrackpadWidgetState();
}

class _TrackpadWidgetState extends State<TrackpadWidget> {
  double _scale = 1.0;
  Offset _offset = Offset.zero;
  double _rotation = 0.0;
  double _previousRotation = 0.0;

  void _handleUpdate(String type, Map<String, double> values) {
    widget.onUpdate(type, values);
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onScaleStart: (details) {
        _previousRotation = _rotation;
      },
      onScaleUpdate: (details) {
        setState(() {
          if (details.pointerCount == 1) {
            // Tek parmakla döndürme
            _rotation = (_previousRotation + details.rotation).clamp(0.0, 1.0);
            _handleUpdate('rotate', {'rotation': _rotation});
          } else if (details.pointerCount == 2) {
            // İki parmakla kaydırma ve yakınlaştırma
            _scale = details.scale.clamp(0.0, 1.0);
            _offset = Offset(
              (details.focalPoint.dx / MediaQuery.of(context).size.width)
                  .clamp(0.0, 1.0),
              (details.focalPoint.dy / MediaQuery.of(context).size.height)
                  .clamp(0.0, 1.0),
            );
            _handleUpdate('pan_zoom',
                {'scale': _scale, 'dx': _offset.dx, 'dy': _offset.dy});
          }
        });
      },
      onScaleEnd: (details) {
        setState(() {
          _scale = 1.0;
          _offset = Offset.zero;
          _rotation = 0.0;
          _previousRotation = 0.0;
        });
        _handleUpdate('end', {
          'scale': _scale,
          'dx': _offset.dx,
          'dy': _offset.dy,
          'rotation': _rotation
        });
      },
      child: Transform(
        transform: Matrix4.identity()
          ..translate(_offset.dx * MediaQuery.of(context).size.width,
              _offset.dy * MediaQuery.of(context).size.height)
          ..scale(_scale)
          ..rotateZ(_rotation * 2 * 3.141592653589793),
        alignment: FractionalOffset.center,
        child: Container(
          width: 200,
          height: 200,
          color: Colors.blue,
          child: Center(child: Text('Trackpad Area')),
        ),
      ),
    );
  }
}