import 'package:flutter/material.dart';
import 'package:flutter_mobx/flutter_mobx.dart';
import 'package:intl/intl.dart';
import '../../../../core/theme/app_colors.dart';
import '../../../../core/widgets/medical_modal.dart';
import '../../../config/presentation/store/config_store.dart';
import '../../services/prescription_pdf_service.dart';

class PrescriptionModalView extends StatefulWidget {
  final String patientName;
  final ConfigStore? configStore;

  const PrescriptionModalView({
    super.key,
    required this.patientName,
    this.configStore,
  });

  @override
  State<PrescriptionModalView> createState() => _PrescriptionModalViewState();
}

class _PrescriptionModalViewState extends State<PrescriptionModalView> {
  late final TextEditingController _patientController;
  late final TextEditingController _prescriptionController;
  late final FocusNode _prescriptionFocusNode;
  late final ConfigStore _configStore;
  bool _isPrinting = false;
  String? _statusMessage;
  bool _hasError = false;

  @override
  void initState() {
    super.initState();
    _patientController = TextEditingController(text: widget.patientName);
    _prescriptionController = TextEditingController();
    _prescriptionFocusNode = FocusNode();
    _configStore = widget.configStore ?? ConfigStore();
    _configStore.loadConfig();
  }

  @override
  void dispose() {
    _patientController.dispose();
    _prescriptionController.dispose();
    _prescriptionFocusNode.dispose();
    super.dispose();
  }

  void _insertBullet() {
    final text = _prescriptionController.text;
    final selection = _prescriptionController.selection;
    final bullet = text.isEmpty || text.endsWith('\n') ? '• ' : '\n• ';

    int start = selection.start;
    int end = selection.end;
    if (start < 0 || end < 0) {
      start = text.length;
      end = text.length;
    }

    final newText = text.replaceRange(start, end, bullet);
    final newOffset = start + bullet.length;

    _prescriptionController.value = TextEditingValue(
      text: newText,
      selection: TextSelection.collapsed(offset: newOffset),
    );
    _prescriptionFocusNode.requestFocus();
  }

  Future<void> _handlePrint() async {
    final patient = _patientController.text.trim();
    final prescription = _prescriptionController.text.trim();

    if (patient.isEmpty) {
      setState(() {
        _statusMessage = 'Debe indicar el nombre del paciente.';
        _hasError = true;
      });
      return;
    }

    if (prescription.isEmpty) {
      setState(() {
        _statusMessage = 'Debe redactar los medicamentos e indicaciones de la receta.';
        _hasError = true;
      });
      return;
    }

    setState(() {
      _isPrinting = true;
      _statusMessage = 'Generando receta médica en formato oficial...';
      _hasError = false;
    });

    try {
      await PrescriptionPdfService.printPrescription(
        doctorName: _configStore.nombreDoctor,
        specialty: _configStore.especialidad,
        subspecialty: _configStore.descripEspecialidad,
        generalContact: _configStore.descripGeneral,
        patientName: patient,
        prescriptionText: prescription,
      );

      if (mounted) {
        setState(() {
          _isPrinting = false;
          _statusMessage = 'Receta generada con éxito.';
          _hasError = false;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _isPrinting = false;
          _statusMessage = 'Error al generar la receta: $e';
          _hasError = true;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final formattedDate = DateFormat('dd/MM/yyyy').format(DateTime.now());

    return Observer(
      builder: (_) {
        return MedicalModalDialog(
          maxWidth: 820,
          maxHeight: 650,
          title: 'Emisión de Receta Médica',
          titleIcon: Container(
            padding: const EdgeInsets.all(8),
            decoration: BoxDecoration(
              color: const Color(0xFF00A65A).withValues(alpha: 0.12),
              borderRadius: BorderRadius.circular(10),
            ),
            child: const Icon(
              Icons.medication_rounded,
              color: Color(0xFF00A65A),
              size: 20,
            ),
          ),
          subtitle: const Text(
            'Redacte la prescripción para imprimir en talonario media carta institucional',
            style: TextStyle(fontSize: 12, color: AppColors.textMuted),
          ),
          bottomBar: Container(
            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
            decoration: const BoxDecoration(
              color: Color(0xFFF8FAFC),
              border: Border(top: BorderSide(color: Color(0xFFE2E8F0))),
            ),
            child: Row(
              children: [
                Container(
                  padding: const EdgeInsets.all(4),
                  decoration: BoxDecoration(
                    color: _hasError
                        ? AppColors.error.withValues(alpha: 0.12)
                        : const Color(0xFF00A65A).withValues(alpha: 0.12),
                    shape: BoxShape.circle,
                  ),
                  child: Icon(
                    _hasError
                        ? Icons.error_outline_rounded
                        : Icons.check_circle_outline_rounded,
                    size: 15,
                    color: _hasError ? AppColors.error : const Color(0xFF00A65A),
                  ),
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    _statusMessage ??
                        (_isPrinting
                            ? 'Preparando documento para impresión...'
                            : 'Listo para emitir la receta médica'),
                    style: TextStyle(
                      fontSize: 12,
                      fontWeight: FontWeight.w600,
                      color: _hasError ? AppColors.error : AppColors.textSecondary,
                    ),
                  ),
                ),
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(6),
                    border: Border.all(color: const Color(0xFFE2E8F0)),
                  ),
                  child: const Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(Icons.keyboard_outlined, size: 12, color: AppColors.textMuted),
                      SizedBox(width: 4),
                      Text(
                        'ESC para salir',
                        style: TextStyle(
                          fontSize: 11,
                          color: AppColors.textMuted,
                          fontWeight: FontWeight.w500,
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(width: 12),
                ElevatedButton.icon(
                  onPressed: _isPrinting ? null : _handlePrint,
                  icon: _isPrinting
                      ? const SizedBox(
                          width: 16,
                          height: 16,
                          child: CircularProgressIndicator(
                            strokeWidth: 2,
                            color: Colors.white,
                          ),
                        )
                      : const Icon(Icons.print_rounded, size: 16),
                  label: Text(
                    _isPrinting ? 'Generando...' : 'Crear / Imprimir Receta',
                    style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 12.5),
                  ),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: const Color(0xFF00A65A),
                    foregroundColor: Colors.white,
                    padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                    elevation: 0,
                  ),
                ),
              ],
            ),
          ),
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                // Membrete Informativo del Médico (Vista preliminar institucional)
                Container(
                  padding: const EdgeInsets.all(16),
                  decoration: BoxDecoration(
                    color: const Color(0xFFF8FAFC),
                    borderRadius: BorderRadius.circular(12),
                    border: Border.all(color: const Color(0xFFE2E8F0)),
                  ),
                  child: Column(
                    children: [
                      Text(
                        _configStore.nombreDoctor.isNotEmpty
                            ? _configStore.nombreDoctor
                            : 'Dr. Luis A. Castro Sosa',
                        textAlign: TextAlign.center,
                        style: const TextStyle(
                          fontSize: 18,
                          fontWeight: FontWeight.w700,
                          color: AppColors.textPrimary,
                          letterSpacing: -0.3,
                        ),
                      ),
                      if (_configStore.especialidad.isNotEmpty) ...[
                        const SizedBox(height: 2),
                        Text(
                          _configStore.especialidad.toUpperCase(),
                          textAlign: TextAlign.center,
                          style: const TextStyle(
                            fontSize: 11.5,
                            fontWeight: FontWeight.w600,
                            color: AppColors.primary,
                            letterSpacing: 0.5,
                          ),
                        ),
                      ],
                      if (_configStore.descripEspecialidad.isNotEmpty) ...[
                        const SizedBox(height: 2),
                        Text(
                          _configStore.descripEspecialidad.toUpperCase(),
                          textAlign: TextAlign.center,
                          style: const TextStyle(
                            fontSize: 10,
                            color: AppColors.textMuted,
                          ),
                        ),
                      ],
                      const SizedBox(height: 4),
                      Text(
                        'Fecha: $formattedDate',
                        style: const TextStyle(
                          fontSize: 11,
                          fontWeight: FontWeight.w500,
                          color: AppColors.textSecondary,
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 16),

                // Campo Paciente
                Row(
                  children: [
                    Container(
                      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
                      decoration: BoxDecoration(
                        color: const Color(0xFF00A65A).withValues(alpha: 0.1),
                        borderRadius: BorderRadius.circular(8),
                      ),
                      child: const Text(
                        'Rx',
                        style: TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.w800,
                          color: Color(0xFF00A65A),
                        ),
                      ),
                    ),
                    const SizedBox(width: 12),
                    Expanded(
                      child: TextField(
                        controller: _patientController,
                        decoration: InputDecoration(
                          labelText: 'Paciente',
                          hintText: 'Nombre del paciente',
                          isDense: true,
                          floatingLabelBehavior: FloatingLabelBehavior.always,
                          filled: true,
                          fillColor: Colors.white,
                          contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 12),
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                            borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
                          ),
                          enabledBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                            borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
                          ),
                          focusedBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                            borderSide: const BorderSide(color: AppColors.primary, width: 1.5),
                          ),
                        ),
                        style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 16),

                // Barra de herramientas de redacción
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text(
                      'Medicamentos y Posología:',
                      style: TextStyle(
                        fontSize: 13,
                        fontWeight: FontWeight.w700,
                        color: AppColors.textPrimary,
                      ),
                    ),
                    TextButton.icon(
                      onPressed: _insertBullet,
                      icon: const Icon(Icons.format_list_bulleted_rounded, size: 16),
                      label: const Text('Insertar viñeta (•)', style: TextStyle(fontSize: 12)),
                      style: TextButton.styleFrom(
                        foregroundColor: AppColors.primary,
                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                        visualDensity: VisualDensity.compact,
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 6),

                // Lienzo de prescripción
                TextField(
                  controller: _prescriptionController,
                  focusNode: _prescriptionFocusNode,
                  maxLines: 12,
                  minLines: 8,
                  style: const TextStyle(fontSize: 13.5, height: 1.5, color: AppColors.textPrimary),
                  decoration: InputDecoration(
                    hintText: '1. Nombre del medicamento, concentración\n   - Dosis y frecuencia (ej. Tomar 1 tableta cada 8 horas por 7 días)\n   - Indicaciones especiales (con comidas, en ayunas, etc.)\n\n2. Siguiente medicamento...',
                    hintStyle: const TextStyle(color: Color(0xFF94A3B8), fontSize: 13),
                    filled: true,
                    fillColor: Colors.white,
                    contentPadding: const EdgeInsets.all(16),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
                    ),
                    enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
                    ),
                    focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(color: AppColors.primary, width: 1.5),
                    ),
                  ),
                ),
              ],
            ),
          ),
        );
      },
    );
  }
}