import 'package:flutter/material.dart';
import '../../core/app_colors.dart';
import '../../data/celaya_colonias.dart';
import '../../database/db_helper.dart';
import '../../models/models.dart';

class CreateRouteScreen extends StatefulWidget {
  final RouteDefinitionModel? editing;
  const CreateRouteScreen({super.key, this.editing});
  @override State<CreateRouteScreen> createState() => _CreateRouteScreenState();
}

class _CreateRouteScreenState extends State<CreateRouteScreen> {
  final _nombreCtrl = TextEditingController();
  final _routeIdCtrl = TextEditingController();
  String _turno = 'MATUTINO';
  String _horaInicio = '06:00';
  String _horaFin = '08:00';
  List<String> _diasSeleccionados = [];
  List<String> _coloniasSeleccionadas = [];
  String _searchColonia = '';
  bool _loading = false;

  static const _diasGrupoA = ['LUNES', 'MIERCOLES', 'VIERNES'];
  static const _diasGrupoB = ['MARTES', 'JUEVES', 'SABADO'];

  @override
  void initState() {
    super.initState();
    if (widget.editing != null) {
      final e = widget.editing!;
      _nombreCtrl.text = e.nombre;
      _routeIdCtrl.text = e.routeId;
      _turno = e.turno;
      _horaInicio = e.horaInicio;
      _horaFin = e.horaFin;
      _diasSeleccionados = List.from(e.dias);
      _coloniasSeleccionadas = List.from(e.colonias);
    }
  }

  List<String> get _filteredColonias => _searchColonia.isEmpty
      ? celayaColonias
      : celayaColonias.where((c) =>
          c.toLowerCase().contains(_searchColonia.toLowerCase())).toList();

  Future<void> _guardar() async {
    if (_nombreCtrl.text.trim().isEmpty) {
      _snack('Ingresa un nombre para la ruta', isError: true); return; }
    if (_routeIdCtrl.text.trim().isEmpty) {
      _snack('Ingresa el ID de la ruta (ej. RUTA-16)', isError: true); return; }
    if (_diasSeleccionados.isEmpty) {
      _snack('Selecciona al menos un día', isError: true); return; }
    if (_coloniasSeleccionadas.isEmpty) {
      _snack('Selecciona al menos una colonia', isError: true); return; }

    setState(() => _loading = true);
    final route = RouteDefinitionModel(
      id: widget.editing?.id,
      routeId: _routeIdCtrl.text.trim().toUpperCase(),
      nombre: _nombreCtrl.text.trim(),
      dias: _diasSeleccionados,
      horaInicio: _horaInicio,
      horaFin: _horaFin,
      turno: _turno,
      colonias: _coloniasSeleccionadas,
    );
    await DbHelper.insertRouteDefinition(route);
    if (!mounted) return;
    setState(() => _loading = false);
    _snack('Ruta guardada correctamente');
    Navigator.pop(context, true);
  }

  void _snack(String msg, {bool isError = false}) =>
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text(msg),
          backgroundColor: isError ? AppColors.rojoError : AppColors.verdeExito));

  Future<TimeOfDay?> _pickTime(String current) async {
    final parts = current.split(':');
    return showTimePicker(
      context: context,
      initialTime: TimeOfDay(hour: int.parse(parts[0]), minute: int.parse(parts[1])),
    );
  }

  String _timeLabel(TimeOfDay t) =>
      '${t.hour.toString().padLeft(2,'0')}:${t.minute.toString().padLeft(2,'0')}';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.grisFondo,
      appBar: AppBar(
        backgroundColor: AppColors.guindaPrimary, foregroundColor: Colors.white,
        title: Text(widget.editing != null ? 'Editar Ruta' : 'Nueva Ruta'),
        bottom: PreferredSize(preferredSize: const Size.fromHeight(4),
            child: Container(height: 4, color: AppColors.dorado)),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [

          // Info básica
          _section('Información de la ruta'),
          _field(_routeIdCtrl, 'ID de Ruta (ej. RUTA-16)', Icons.tag),
          const SizedBox(height: 12),
          _field(_nombreCtrl, 'Nombre descriptivo', Icons.route),
          const SizedBox(height: 16),

          // Turno
          _section('Turno de operación'),
          Row(children: ['MATUTINO','VESPERTINO','NOCTURNO'].map((t) =>
            Expanded(child: RadioListTile<String>(dense: true, value: t,
              groupValue: _turno,
              title: Text(_turnoLabel(t), style: const TextStyle(fontSize: 12)),
              activeColor: AppColors.guindaPrimary,
              onChanged: (v) => setState(() => _turno = v!)))
          ).toList()),
          const SizedBox(height: 8),

          // Horario
          _section('Horario de servicio'),
          Row(children: [
            Expanded(child: _timeButton('Hora inicio', _horaInicio, () async {
              final t = await _pickTime(_horaInicio);
              if (t != null) setState(() => _horaInicio = _timeLabel(t));
            })),
            const SizedBox(width: 12),
            Expanded(child: _timeButton('Hora fin', _horaFin, () async {
              final t = await _pickTime(_horaFin);
              if (t != null) setState(() => _horaFin = _timeLabel(t));
            })),
          ]),
          const SizedBox(height: 16),

          // Días
          _section('Días de operación'),
          Container(padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(color: Colors.blue.shade50,
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.blue.shade200)),
            child: const Text(
              ' Selecciona Grupo A (L/M/V) o Grupo B (M/J/S), o días individuales.',
              style: TextStyle(fontSize: 12, color: AppColors.azulInfo)),
          ),
          const SizedBox(height: 8),
          Row(children: [
            Expanded(child: OutlinedButton(
              onPressed: () => setState(() => _diasSeleccionados = List.from(_diasGrupoA)),
              style: OutlinedButton.styleFrom(
                  foregroundColor: AppColors.guindaPrimary,
                  side: const BorderSide(color: AppColors.guindaPrimary)),
              child: const Text('Grupo A\nL/M/V', textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 11)))),
            const SizedBox(width: 8),
            Expanded(child: OutlinedButton(
              onPressed: () => setState(() => _diasSeleccionados = List.from(_diasGrupoB)),
              style: OutlinedButton.styleFrom(
                  foregroundColor: AppColors.guindaPrimary,
                  side: const BorderSide(color: AppColors.guindaPrimary)),
              child: const Text('Grupo B\nM/J/S', textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 11)))),
          ]),
          const SizedBox(height: 8),
          Wrap(spacing: 6, runSpacing: 6, children: AppDias.todos.map((dia) {
            final sel = _diasSeleccionados.contains(dia);
            return FilterChip(
              label: Text(AppDias.label(dia), style: TextStyle(fontSize: 11,
                  color: sel ? Colors.white : AppColors.negroTexto)),
              selected: sel,
              selectedColor: AppColors.guindaPrimary,
              checkmarkColor: Colors.white,
              onSelected: (v) => setState(() {
                if (v) _diasSeleccionados.add(dia);
                else _diasSeleccionados.remove(dia);
              }),
            );
          }).toList()),
          const SizedBox(height: 16),

          // Colonias
          _section('Colonias que cubre (${_coloniasSeleccionadas.length} seleccionadas)'),
          TextField(
            onChanged: (v) => setState(() => _searchColonia = v),
            decoration: const InputDecoration(
              hintText: 'Buscar colonia de Celaya...',
              prefixIcon: Icon(Icons.search), border: OutlineInputBorder(),
              filled: true, fillColor: Colors.white, isDense: true),
          ),
          const SizedBox(height: 8),
          Container(height: 220,
            decoration: BoxDecoration(color: Colors.white,
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.grey.shade300)),
            child: ListView.builder(
              itemCount: _filteredColonias.length,
              itemBuilder: (_, i) {
                final c = _filteredColonias[i];
                final sel = _coloniasSeleccionadas.contains(c);
                return CheckboxListTile(dense: true,
                  title: Text(c, style: const TextStyle(fontSize: 12)),
                  value: sel,
                  activeColor: AppColors.guindaPrimary,
                  controlAffinity: ListTileControlAffinity.leading,
                  onChanged: (v) => setState(() {
                    if (v == true) _coloniasSeleccionadas.add(c);
                    else _coloniasSeleccionadas.remove(c);
                  }),
                );
              },
            ),
          ),
          if (_coloniasSeleccionadas.isNotEmpty) ...[
            const SizedBox(height: 8),
            Wrap(spacing: 4, runSpacing: 4, children: _coloniasSeleccionadas.map((c) =>
              Chip(label: Text(c, style: const TextStyle(fontSize: 10)),
                  backgroundColor: AppColors.guindaPrimary.withOpacity(0.1),
                  deleteIconColor: AppColors.guindaPrimary,
                  onDeleted: () => setState(() => _coloniasSeleccionadas.remove(c)))).toList()),
          ],
          const SizedBox(height: 24),

          SizedBox(width: double.infinity, height: 50,
            child: ElevatedButton.icon(
              onPressed: _loading ? null : _guardar,
              style: ElevatedButton.styleFrom(
                  backgroundColor: AppColors.guindaPrimary, foregroundColor: Colors.white,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8))),
              icon: _loading
                  ? const SizedBox(width: 18, height: 18,
                      child: CircularProgressIndicator(color: Colors.white, strokeWidth: 2))
                  : const Icon(Icons.save),
              label: const Text('GUARDAR RUTA', style: TextStyle(fontWeight: FontWeight.bold)))),
          const SizedBox(height: 30),
        ]),
      ),
    );
  }

  Widget _section(String title) => Padding(
    padding: const EdgeInsets.only(bottom: 8),
    child: Text(title, style: const TextStyle(fontWeight: FontWeight.bold,
        color: AppColors.guindaPrimary, fontSize: 15)));

  Widget _field(TextEditingController ctrl, String label, IconData icon) =>
      TextField(controller: ctrl,
        decoration: InputDecoration(labelText: label,
            prefixIcon: Icon(icon, color: AppColors.guindaPrimary),
            border: const OutlineInputBorder(), filled: true, fillColor: Colors.white));

  Widget _timeButton(String label, String value, VoidCallback onTap) =>
      InkWell(onTap: onTap,
        child: Container(padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(color: Colors.white,
              borderRadius: BorderRadius.circular(8),
              border: Border.all(color: Colors.grey.shade400)),
          child: Row(children: [
            const Icon(Icons.access_time, color: AppColors.guindaPrimary, size: 18),
            const SizedBox(width: 8),
            Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
              Text(label, style: const TextStyle(fontSize: 10, color: AppColors.grisTexto)),
              Text(value, style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16)),
            ]),
          ])));

  String _turnoLabel(String t) => t == 'MATUTINO' ? 'Matutino'
      : t == 'VESPERTINO' ? 'Vespertino' : 'Nocturno';

  @override void dispose() { _nombreCtrl.dispose(); _routeIdCtrl.dispose(); super.dispose(); }
}