import 'package:flutter/material.dart';
import 'package:p_tits_pas/models/relais_model.dart';
import 'package:p_tits_pas/models/user.dart';
import 'package:p_tits_pas/services/relais_service.dart';
import 'package:p_tits_pas/services/user_service.dart';
import 'package:p_tits_pas/widgets/admin/common/admin_user_card.dart';
import 'package:p_tits_pas/widgets/admin/common/user_list.dart';

class GestionnaireManagementWidget extends StatefulWidget {
  final String searchQuery;

  const GestionnaireManagementWidget({
    Key? key,
    required this.searchQuery,
  }) : super(key: key);

  @override
  State<GestionnaireManagementWidget> createState() =>
      _GestionnaireManagementWidgetState();
}

class _GestionnaireManagementWidgetState
    extends State<GestionnaireManagementWidget> {
  bool _isLoading = false;
  String? _error;
  List<AppUser> _gestionnaires = [];
  List<RelaisModel> _relais = [];

  @override
  void initState() {
    super.initState();
    _loadGestionnaires();
  }

  @override
  void dispose() => super.dispose();

  Future<void> _loadGestionnaires() async {
    setState(() {
      _isLoading = true;
      _error = null;
    });
    try {
      final gestionnaires = await UserService.getGestionnaires();
      List<RelaisModel> relais = [];
      try {
        relais = await RelaisService.getRelais();
      } catch (_) {
        // L'ecran reste utilisable meme si la route Relais n'est pas disponible.
      }

      if (!mounted) return;
      setState(() {
        _gestionnaires = gestionnaires;
        _relais = relais;
        _isLoading = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = e.toString();
        _isLoading = false;
      });
    }
  }

  Future<void> _openRelaisAssignmentDialog(AppUser user) async {
    String? selectedRelaisId = user.relaisId;
    final saved = await showDialog<bool>(
      context: context,
      builder: (ctx) {
        return StatefulBuilder(
          builder: (context, setStateDialog) {
            return AlertDialog(
              title: Text(
                'Rattacher ${user.fullName.isEmpty ? user.email : user.fullName}',
              ),
              content: DropdownButtonFormField<String?>(
                value: selectedRelaisId,
                isExpanded: true,
                decoration: const InputDecoration(
                  labelText: 'Relais principal',
                  border: OutlineInputBorder(),
                ),
                items: [
                  const DropdownMenuItem<String?>(
                    value: null,
                    child: Text('Aucun relais'),
                  ),
                  ..._relais.map(
                    (relais) => DropdownMenuItem<String?>(
                      value: relais.id,
                      child: Text(relais.nom),
                    ),
                  ),
                ],
                onChanged: (value) {
                  setStateDialog(() {
                    selectedRelaisId = value;
                  });
                },
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.of(ctx).pop(false),
                  child: const Text('Annuler'),
                ),
                FilledButton(
                  onPressed: () => Navigator.of(ctx).pop(true),
                  child: const Text('Enregistrer'),
                ),
              ],
            );
          },
        );
      },
    );

    if (saved != true) return;

    try {
      await UserService.updateGestionnaireRelais(
        gestionnaireId: user.id,
        relaisId: selectedRelaisId,
      );
      if (!mounted) return;
      await _loadGestionnaires();
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Rattachement relais mis a jour.')),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            e.toString().replaceAll('Exception: ', ''),
          ),
          backgroundColor: Colors.red.shade600,
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final query = widget.searchQuery.toLowerCase();
    final filteredGestionnaires = _gestionnaires.where((u) {
      final name = u.fullName.toLowerCase();
      final email = u.email.toLowerCase();
      return name.contains(query) || email.contains(query);
    }).toList();

    return UserList(
      isLoading: _isLoading,
      error: _error,
      isEmpty: filteredGestionnaires.isEmpty,
      emptyMessage: 'Aucun gestionnaire trouvé.',
      itemCount: filteredGestionnaires.length,
      itemBuilder: (context, index) {
        final user = filteredGestionnaires[index];
        return AdminUserCard(
          title: user.fullName,
          avatarUrl: user.photoUrl,
          subtitleLines: [
            user.email,
            'Statut : ${user.statut ?? 'Inconnu'}',
            'Relais : ${user.relaisNom ?? 'Non rattaché'}',
          ],
          actions: [
            IconButton(
              icon: const Icon(Icons.location_city_outlined),
              tooltip: 'Rattacher un relais',
              onPressed: () => _openRelaisAssignmentDialog(user),
            ),
            IconButton(
              icon: const Icon(Icons.edit),
              tooltip: 'Modifier',
              onPressed: () {
                // TODO: Modifier gestionnaire.
              },
            ),
          ],
        );
      },
    );
  }
}