import 'package:flutter/material.dart';
import 'package:my_app/appeditor/custom/AppEditorWidgetContext.dart';

Widget buildCustomWidget(BuildContext context, AppEditorWidgetContext app) {
  return SensorMonitor(app: app);
}

class SensorMonitor extends StatefulWidget {
  const SensorMonitor({super.key, required this.app});
  final AppEditorWidgetContext app;
  @override
  State<SensorMonitor> createState() => _SensorMonitorState();
}

class _SensorMonitorState extends State<SensorMonitor> {
  late String _variable;
  late Stream<dynamic> _samples;
  bool _busy = false;

  void _bind() {
    _variable = widget.app.params['variable'] as String? ?? 'sensorData';
    _samples = widget.app.watchVar(_variable);
  }

  @override
  void initState() {
    super.initState();
    _bind();
  }

  @override
  void didUpdateWidget(covariant SensorMonitor oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (_variable != (widget.app.params['variable'] as String? ?? 'sensorData') ||
        !identical(oldWidget.app, widget.app)) _bind();
  }

  Future<void> _run(String name) async {
    final app = widget.app;
    final variable = _variable;
    setState(() => _busy = true);
    try {
      await app.runAction(name);
      // Sensor stop preserves its last sample. Clear only this output variable
      // so this monitor does not display an old sample as a live measurement.
      if (name == 'stopSensor' && app.mounted) await app.removeVar(variable);
    } catch (_) {
      app.showMessage('اجرای عملکرد سنسور ممکن نشد');
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  String _number(dynamic value) => value is num && value.toDouble().isFinite
      ? value.toStringAsFixed(3) : '—';

  @override
  Widget build(BuildContext context) => StreamBuilder<dynamic>(
    stream: _samples,
    builder: (context, snapshot) {
      final data = snapshot.data is Map ? snapshot.data as Map : const {};
      final status = data['status'];
      final active = status == 'active';
      final label = switch (status) {
        'starting' => 'در حال شروع',
        'active' => 'دریافت داده',
        'paused' => 'دریافت مکث شده',
        'error' => 'خطای سنسور: ${data['error'] ?? 'نامشخص'}',
        _ => 'دریافت شروع نشده یا متوقف شده است',
      };
      return Card(child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(mainAxisSize: MainAxisSize.min, children: [
          Text(widget.app.params['title'] as String? ?? 'دادهٔ سنسور',
              style: Theme.of(context).textTheme.titleLarge),
          const SizedBox(height: 8),
          Text(label, textAlign: TextAlign.center),
          if (data['simulated'] == true) const Text('دادهٔ شبیه‌سازی‌شده'),
          Text('نوع: ${data['sensor'] ?? '—'}'),
          if (active) ...[
            Text('x: ${_number(data['x'])}  y: ${_number(data['y'])}  z: ${_number(data['z'])}',
                textDirection: TextDirection.ltr),
            Text('magnitude: ${_number(data['magnitude'])}',
                textDirection: TextDirection.ltr),
            Text('زمان نمونه: ${data['timestamp'] ?? '—'}'),
          ],
          const SizedBox(height: 8),
          Wrap(spacing: 12, children: [
            ElevatedButton(onPressed: !_busy && widget.app.hasAction('startSensor')
                ? () => _run('startSensor') : null, child: const Text('شروع')),
            OutlinedButton(onPressed: !_busy && widget.app.hasAction('stopSensor')
                ? () => _run('stopSensor') : null, child: const Text('توقف')),
          ]),
        ]),
      ));
    },
  );
}