import 'dart:ui';
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;
  bool _showPosologyPanel = 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 _insertText(String textToInsert) {
    final text = _prescriptionController.text;
    final selection = _prescriptionController.selection;

    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, textToInsert);
    final newOffset = start + textToInsert.length;

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

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

  void _insertNextNumber() {
    final text = _prescriptionController.text;
    final matches = RegExp(r'(?:^|\n)\s*(\d+)\.').allMatches(text);
    int nextNumber = 1;
    if (matches.isNotEmpty) {
      final lastNum = int.tryParse(matches.last.group(1) ?? '0') ?? 0;
      nextNumber = lastNum + 1;
    }
    final prefix = text.isEmpty || text.endsWith('\n') ? '$nextNumber. ' : '\n$nextNumber. ';
    _insertText(prefix);
  }

  void _insertSubIndication() {
    final text = _prescriptionController.text;
    final prefix = text.isEmpty || text.endsWith('\n') ? '   - ' : '\n   - ';
    _insertText(prefix);
  }

  void _insertDosageQuick(String dosage) {
    final text = _prescriptionController.text;
    final selection = _prescriptionController.selection;
    int start = selection.start;
    String toInsert = dosage;
    if (start > 0 && text.isNotEmpty && start <= text.length) {
      final prevChar = text[start - 1];
      if (prevChar != ' ' && prevChar != '\n') {
        toInsert = ' $dosage';
      }
    }
    _insertText(toInsert);
  }

  Widget _buildPosologyCategoryRow({
    required String badgeLabel,
    required Color badgeBgColor,
    required Color badgeTextColor,
    required List<String> items,
  }) {
    return _PosologyCategoryRowWidget(
      badgeLabel: badgeLabel,
      badgeBgColor: badgeBgColor,
      badgeTextColor: badgeTextColor,
      items: items,
      onSelected: _insertDosageQuick,
    );
  }

  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),

                // Sección de Medicamentos y Redacción Inteligente
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text(
                      'Medicamentos e Indicaciones:',
                      style: TextStyle(
                        fontSize: 13,
                        fontWeight: FontWeight.w700,
                        color: AppColors.textPrimary,
                      ),
                    ),
                    ValueListenableBuilder<TextEditingValue>(
                      valueListenable: _prescriptionController,
                      builder: (context, val, _) {
                        if (val.text.isEmpty) return const SizedBox.shrink();
                        return InkWell(
                          onTap: () {
                            _prescriptionController.clear();
                          },
                          borderRadius: BorderRadius.circular(4),
                          child: const Padding(
                            padding: EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                            child: Row(
                              children: [
                                Icon(Icons.clear_all_rounded, size: 14, color: AppColors.textMuted),
                                SizedBox(width: 4),
                                Text(
                                  'Limpiar lienzo',
                                  style: TextStyle(fontSize: 11, color: AppColors.textMuted, fontWeight: FontWeight.w500),
                                ),
                              ],
                            ),
                          ),
                        );
                      },
                    ),
                  ],
                ),
                const SizedBox(height: 8),

                // Editor de Receta con Toolbar Inteligente Integrada
                Container(
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(10),
                    border: Border.all(color: const Color(0xFFCBD5E1)),
                    boxShadow: [
                      BoxShadow(
                        color: Colors.black.withValues(alpha: 0.02),
                        blurRadius: 4,
                        offset: const Offset(0, 2),
                      ),
                    ],
                  ),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      // Barra de herramientas superior
                      Container(
                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
                        decoration: const BoxDecoration(
                          color: Color(0xFFF8FAFC),
                          borderRadius: BorderRadius.vertical(top: Radius.circular(9)),
                          border: Border(bottom: BorderSide(color: Color(0xFFE2E8F0))),
                        ),
                        child: ScrollConfiguration(
                          behavior: const MaterialScrollBehavior().copyWith(
                            dragDevices: {
                              PointerDeviceKind.touch,
                              PointerDeviceKind.mouse,
                              PointerDeviceKind.trackpad,
                              PointerDeviceKind.stylus,
                            },
                          ),
                          child: SingleChildScrollView(
                            scrollDirection: Axis.horizontal,
                            physics: const BouncingScrollPhysics(),
                            child: Row(
                              children: [
                                // 1. Número consecutivo
                                _ToolbarActionBtn(
                                  icon: Icons.format_list_numbered_rounded,
                                  label: '1. Número',
                                  tooltip: 'Agregar siguiente número consecutivo (1., 2., ...)',
                                  onTap: _insertNextNumber,
                                ),
                                const SizedBox(width: 6),
                                // Viñeta (Mantiene texto exacto para compatibilidad con tests)
                                _ToolbarActionBtn(
                                  icon: Icons.format_list_bulleted_rounded,
                                  label: 'Insertar viñeta (•)',
                                  tooltip: 'Insertar viñeta de indicación secundaria',
                                  onTap: _insertBullet,
                                ),
                                const SizedBox(width: 6),
                                // Sub-indicación (Dosis)
                                _ToolbarActionBtn(
                                  icon: Icons.subdirectory_arrow_right_rounded,
                                  label: '↳ Dosis',
                                  tooltip: 'Indentar indicación de dosis (- )',
                                  onTap: _insertSubIndication,
                                ),
                                const SizedBox(width: 6),
                                // Separador vertical
                                Container(
                                  height: 18,
                                  width: 1,
                                  margin: const EdgeInsets.symmetric(horizontal: 2),
                                  color: const Color(0xFFCBD5E1),
                                ),
                                const SizedBox(width: 6),
                                // Botón alternador del panel de posologías
                                _ToolbarActionBtn(
                                  icon: Icons.tune_rounded,
                                  label: _showPosologyPanel ? 'Ocultar posologías ▲' : '⏱ Posologías rápidas ▼',
                                  tooltip: _showPosologyPanel
                                      ? 'Ocultar el panel de atajos de posología'
                                      : 'Mostrar atajos de horario, duración e indicaciones',
                                  isActive: _showPosologyPanel,
                                  onTap: () {
                                    setState(() {
                                      _showPosologyPanel = !_showPosologyPanel;
                                    });
                                  },
                                ),
                              ],
                            ),
                          ),
                        ),
                      ),

                      // Panel Desplegable de Posología Categorizada
                      if (_showPosologyPanel)
                        Container(
                          padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
                          decoration: const BoxDecoration(
                            color: Color(0xFFF8FAFC),
                            border: Border(bottom: BorderSide(color: Color(0xFFE2E8F0))),
                          ),
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              // Fila 1: Horarios / Frecuencia
                              _buildPosologyCategoryRow(
                                badgeLabel: '🕒 Horario',
                                badgeBgColor: const Color(0xFFEFF6FF),
                                badgeTextColor: const Color(0xFF1D4ED8),
                                items: const [
                                  'cada 8 horas',
                                  'cada 12 horas',
                                  'cada 24 horas',
                                  '1 vez al día (mañana)',
                                  '1 vez al día (noche)',
                                  'al acostarse',
                                ],
                              ),
                              const SizedBox(height: 6),
                              // Fila 2: Duración
                              _buildPosologyCategoryRow(
                                badgeLabel: '📅 Duración',
                                badgeBgColor: const Color(0xFFF0FDF4),
                                badgeTextColor: const Color(0xFF15803D),
                                items: const [
                                  'por 3 días',
                                  'por 5 días',
                                  'por 7 días',
                                  'por 10 días',
                                  'por 14 días',
                                  'por 30 días',
                                  'SOS (según dolor)',
                                ],
                              ),
                              const SizedBox(height: 6),
                              // Fila 3: Forma e Indicación Especial
                              _buildPosologyCategoryRow(
                                badgeLabel: '💡 Indicación',
                                badgeBgColor: const Color(0xFFFFFBEB),
                                badgeTextColor: const Color(0xFFB45309),
                                items: const [
                                  '1 tableta',
                                  '1 cápsula',
                                  '1 ampolla',
                                  'con alimentos',
                                  'en ayunas (30 min antes)',
                                  'con abundante agua',
                                  'no suspender',
                                ],
                              ),
                            ],
                          ),
                        ),

                      // Lienzo de prescripción
                      TextField(
                        controller: _prescriptionController,
                        focusNode: _prescriptionFocusNode,
                        maxLines: 12,
                        minLines: 7,
                        style: const TextStyle(fontSize: 13.5, height: 1.5, color: AppColors.textPrimary),
                        decoration: const InputDecoration(
                          hintText: '1. Ciprofloxacina 500mg (14 tabletas)\n   - Tomar 1 tableta cada 12 horas por 7 días con abundante agua.\n\n2. Tamsulosina 0.4mg (30 cápsulas)\n   - Tomar 1 cápsula cada 24 horas después de la cena.',
                          hintStyle: TextStyle(color: Color(0xFF94A3B8), fontSize: 12.5),
                          border: InputBorder.none,
                          contentPadding: EdgeInsets.all(14),
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        );
      },
    );
  }
}

class _ToolbarActionBtn extends StatelessWidget {
  final IconData icon;
  final String label;
  final String tooltip;
  final VoidCallback onTap;
  final bool isActive;

  const _ToolbarActionBtn({
    required this.icon,
    required this.label,
    required this.tooltip,
    required this.onTap,
    this.isActive = false,
  });

  @override
  Widget build(BuildContext context) {
    return Tooltip(
      message: tooltip,
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(6),
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
          decoration: BoxDecoration(
            color: isActive ? AppColors.primary.withValues(alpha: 0.08) : Colors.white,
            borderRadius: BorderRadius.circular(6),
            border: Border.all(
              color: isActive ? AppColors.primary : const Color(0xFFCBD5E1),
              width: isActive ? 1.2 : 1.0,
            ),
          ),
          child: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              Icon(icon, size: 14, color: AppColors.primary),
              const SizedBox(width: 4),
              Text(
                label,
                style: TextStyle(
                  fontSize: 11.5,
                  fontWeight: FontWeight.w600,
                  color: isActive ? AppColors.primary : AppColors.textPrimary,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _PosologyChip extends StatelessWidget {
  final String label;
  final VoidCallback onTap;

  const _PosologyChip({
    required this.label,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(6),
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 3.5),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(6),
          border: Border.all(color: const Color(0xFFCBD5E1)),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withValues(alpha: 0.02),
              blurRadius: 2,
              offset: const Offset(0, 1),
            ),
          ],
        ),
        child: Text(
          label,
          style: const TextStyle(
            fontSize: 11,
            fontWeight: FontWeight.w600,
            color: AppColors.textPrimary,
          ),
        ),
      ),
    );
  }
}

class _PosologyCategoryRowWidget extends StatefulWidget {
  final String badgeLabel;
  final Color badgeBgColor;
  final Color badgeTextColor;
  final List<String> items;
  final ValueChanged<String> onSelected;

  const _PosologyCategoryRowWidget({
    required this.badgeLabel,
    required this.badgeBgColor,
    required this.badgeTextColor,
    required this.items,
    required this.onSelected,
  });

  @override
  State<_PosologyCategoryRowWidget> createState() => _PosologyCategoryRowWidgetState();
}

class _PosologyCategoryRowWidgetState extends State<_PosologyCategoryRowWidget> {
  final ScrollController _scrollController = ScrollController();
  bool _canScrollLeft = false;
  bool _canScrollRight = false;

  @override
  void initState() {
    super.initState();
    _scrollController.addListener(_updateScrollIndicators);
    WidgetsBinding.instance.addPostFrameCallback((_) => _updateScrollIndicators());
  }

  void _updateScrollIndicators() {
    if (!mounted || !_scrollController.hasClients) return;
    final pos = _scrollController.position;
    final canLeft = pos.pixels > 3;
    final canRight = pos.pixels < (pos.maxScrollExtent - 3);
    if (canLeft != _canScrollLeft || canRight != _canScrollRight) {
      setState(() {
        _canScrollLeft = canLeft;
        _canScrollRight = canRight;
      });
    }
  }

  void _scroll(double delta) {
    if (!_scrollController.hasClients) return;
    _scrollController.animateTo(
      (_scrollController.offset + delta).clamp(0.0, _scrollController.position.maxScrollExtent),
      duration: const Duration(milliseconds: 220),
      curve: Curves.easeOutCubic,
    );
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        // Category Badge
        Container(
          width: 82,
          padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2.5),
          decoration: BoxDecoration(
            color: widget.badgeBgColor,
            borderRadius: BorderRadius.circular(4),
            border: Border.all(color: widget.badgeTextColor.withValues(alpha: 0.25)),
          ),
          child: Text(
            widget.badgeLabel,
            style: TextStyle(
              fontSize: 9.5,
              fontWeight: FontWeight.w700,
              color: widget.badgeTextColor,
            ),
          ),
        ),
        const SizedBox(width: 6),

        // Botón flecha izquierda cuando hay contenido antes
        if (_canScrollLeft) ...[
          InkWell(
            onTap: () => _scroll(-120),
            borderRadius: BorderRadius.circular(10),
            child: Container(
              padding: const EdgeInsets.all(2),
              decoration: BoxDecoration(
                color: Colors.white,
                shape: BoxShape.circle,
                border: Border.all(color: const Color(0xFFCBD5E1)),
                boxShadow: [
                  BoxShadow(
                    color: Colors.black.withValues(alpha: 0.04),
                    blurRadius: 2,
                  ),
                ],
              ),
              child: const Icon(Icons.chevron_left, size: 14, color: AppColors.textPrimary),
            ),
          ),
          const SizedBox(width: 4),
        ],

        // Área de desplazamiento horizontal
        Expanded(
          child: ScrollConfiguration(
            behavior: const MaterialScrollBehavior().copyWith(
              dragDevices: {
                PointerDeviceKind.touch,
                PointerDeviceKind.mouse,
                PointerDeviceKind.trackpad,
                PointerDeviceKind.stylus,
              },
            ),
            child: SingleChildScrollView(
              controller: _scrollController,
              scrollDirection: Axis.horizontal,
              physics: const BouncingScrollPhysics(),
              child: Row(
                children: widget.items.map((item) {
                  return Padding(
                    padding: const EdgeInsets.only(right: 5),
                    child: _PosologyChip(
                      label: item,
                      onTap: () => widget.onSelected(item),
                    ),
                  );
                }).toList(),
              ),
            ),
          ),
        ),

        // Botón flecha derecha cuando hay contenido después
        if (_canScrollRight) ...[
          const SizedBox(width: 4),
          InkWell(
            onTap: () => _scroll(120),
            borderRadius: BorderRadius.circular(10),
            child: Container(
              padding: const EdgeInsets.all(2),
              decoration: BoxDecoration(
                color: Colors.white,
                shape: BoxShape.circle,
                border: Border.all(color: const Color(0xFFCBD5E1)),
                boxShadow: [
                  BoxShadow(
                    color: Colors.black.withValues(alpha: 0.04),
                    blurRadius: 2,
                  ),
                ],
              ),
              child: const Icon(Icons.chevron_right, size: 14, color: AppColors.textPrimary),
            ),
          ),
        ],
      ],
    );
  }
}