import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:barber_app/core/theme/app_theme.dart';
import 'package:barber_app/features/services/data/models/service_model.dart';
import 'package:barber_app/features/services/data/repositories/service_repository.dart';
import 'package:barber_app/shared/widgets/custom_text_field.dart';
import 'package:barber_app/shared/widgets/loading_button.dart';
import 'package:intl/intl.dart';

class AddServicePage extends StatefulWidget {
  final ServiceModel? service;

  const AddServicePage({super.key, this.service});

  @override
  State<AddServicePage> createState() => _AddServicePageState();
}

class _AddServicePageState extends State<AddServicePage> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _priceController = TextEditingController(); // Valor numérico raw
  final _displayPriceController = TextEditingController(); // Valor formatado R$
  final _durationController = TextEditingController(text: '30');
  
  final _repository = ServiceRepository();
  bool _isLoading = false;
  
  final _currencyFormat = NumberFormat.currency(locale: 'pt_BR', symbol: 'R\$');

  bool get _isEditing => widget.service != null;

  @override
  void initState() {
    super.initState();
    if (_isEditing) {
      _nameController.text = widget.service!.name;
      _priceController.text = widget.service!.price.toStringAsFixed(2);
      _displayPriceController.text = _currencyFormat.format(widget.service!.price);
      _durationController.text = widget.service!.durationMinutes.toString();
    }
  }
  
  void _formatPrice(String value) {
    if (value.isEmpty) return;
    
    // Remove tudo que não é número
    String numbers = value.replaceAll(RegExp(r'[^0-9]'), '');
    if (numbers.isEmpty) return;
    
    double val = double.parse(numbers) / 100;
    _priceController.text = val.toStringAsFixed(2);
    _displayPriceController.text = _currencyFormat.format(val);
    
    // Mantém cursor no final
    _displayPriceController.selection = TextSelection.fromPosition(
      TextPosition(offset: _displayPriceController.text.length),
    );
  }

  Future<void> _saveService() async {
    if (!_formKey.currentState!.validate()) return;
    if (_priceController.text.isEmpty) {
        ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Por favor, informe o preço')),
        );
        return;
    }

    setState(() => _isLoading = true);

    try {
      final price = double.parse(_priceController.text);
      final duration = int.tryParse(_durationController.text) ?? 30;

      if (_isEditing) {
        final updatedService = widget.service!.copyWith(
          name: _nameController.text.trim(),
          price: price,
          durationMinutes: duration,
        );
        await _repository.updateService(updatedService);
      } else {
        await _repository.createService(
          name: _nameController.text.trim(),
          price: price,
          durationMinutes: duration,
        );
      }

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(_isEditing 
              ? 'Serviço atualizado com sucesso!' 
              : 'Serviço criado com sucesso!'
            ),
            backgroundColor: AppColors.success,
          ),
        );
        Navigator.pop(context, true);
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Erro ao salvar: $e'),
            backgroundColor: AppColors.error,
          ),
        );
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_isEditing ? 'Editar Serviço' : 'Novo Serviço'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(24),
        child: Form(
          key: _formKey,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              CustomTextField(
                label: 'Nome do Serviço',
                controller: _nameController,
                hint: 'Ex: Corte Degradê, Barba Terapia...',
                validator: (v) => v?.isEmpty == true ? 'Informe o nome' : null,
              ),
              const SizedBox(height: 16),
              
              CustomTextField(
                label: 'Preço',
                controller: _displayPriceController,
                hint: 'R\$ 0,00',
                keyboardType: TextInputType.number,
                onChanged: _formatPrice,
                validator: (v) => v?.isEmpty == true ? 'Informe o preço' : null,
              ),
              
              const SizedBox(height: 16),
              
              CustomTextField(
                label: 'Duração Média (minutos)',
                controller: _durationController,
                keyboardType: TextInputType.number,
                hint: '30',
                inputFormatters: [FilteringTextInputFormatter.digitsOnly],
              ),
              
              const SizedBox(height: 32),
              
              LoadingButton(
                text: 'Salvar Serviço',
                onPressed: _saveService,
                isLoading: _isLoading,
              ),
            ],
          ),
        ),
      ),
    );
  }
}