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

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

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

class _CalculatorWidgetState extends State<CalculatorWidget> {
  final _first = TextEditingController();
  final _second = TextEditingController();
  String _operation = '+';
  double? _result;
  bool _busy = false;

  @override
  void dispose() {
    _first.dispose();
    _second.dispose();
    super.dispose();
  }

  Future<void> _calculate() async {
    final a = double.tryParse(_first.text.trim());
    final b = double.tryParse(_second.text.trim());
    if (a == null || b == null || !a.isFinite || !b.isFinite) {
      widget.app.showMessage('دو عدد معتبر با رقم انگلیسی وارد کنید.');
      return;
    }
    if (_operation == '/' && b == 0) {
      widget.app.showMessage('تقسیم بر صفر ممکن نیست.');
      return;
    }
    final result = switch (_operation) {
      '+' => a + b,
      '-' => a - b,
      '*' => a * b,
      _ => a / b,
    };
    if (!result.isFinite) {
      widget.app.showMessage('نتیجه خارج از محدوده عددی است.');
      return;
    }
    final app = widget.app;
    final variable =
        app.params['resultVariable'] as String? ?? 'calculator_result';
    setState(() {
      _busy = true;
      _result = result;
    });
    try {
      await app.addVar(
        name: variable,
        value: result,
        storeOnDevice: app.params['storeResult'] == true,
        overwrite: true,
      );
      if (mounted && app.hasAction('onResult')) await app.runAction('onResult');
    } catch (error) {
      app.showMessage('ذخیره نتیجه یا اجرای عملکرد ممکن نشد: $error');
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final args = widget.app.params;
    final decimals = ((args['decimals'] as num?)?.toInt() ?? 2).clamp(0, 8);
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(
              args['title'] as String? ?? 'ماشین حساب',
              style: Theme.of(context).textTheme.titleLarge,
            ),
            const SizedBox(height: 16),
            Wrap(
              spacing: 12,
              runSpacing: 12,
              crossAxisAlignment: WrapCrossAlignment.center,
              children: [
                SizedBox(
                  width: 130,
                  child: TextField(
                    controller: _first,
                    textDirection: TextDirection.ltr,
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                      signed: true,
                    ),
                    decoration: const InputDecoration(labelText: 'عدد اول'),
                  ),
                ),
                DropdownButton<String>(
                  value: _operation,
                  items: ['+', '-', '*', '/'].map((value) {
                    return DropdownMenuItem(value: value, child: Text(value));
                  }).toList(),
                  onChanged: _busy
                      ? null
                      : (value) {
                          if (value != null) setState(() => _operation = value);
                        },
                ),
                SizedBox(
                  width: 130,
                  child: TextField(
                    controller: _second,
                    textDirection: TextDirection.ltr,
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                      signed: true,
                    ),
                    decoration: const InputDecoration(labelText: 'عدد دوم'),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),
            FilledButton(
              onPressed: _busy ? null : _calculate,
              child: Text(_busy ? 'در حال انجام…' : 'محاسبه'),
            ),
            if (_result != null) ...[
              const SizedBox(height: 16),
              Text(
                _result!.toStringAsFixed(decimals),
                textDirection: TextDirection.ltr,
                style: Theme.of(context).textTheme.headlineMedium,
              ),
            ],
          ],
        ),
      ),
    );
  }
}