import 'package:flutter/material.dart';
import 'package:p_tits_pas/models/dossier_list_item.dart';
import 'package:p_tits_pas/utils/enfant_status_utils.dart';
import 'package:p_tits_pas/models/enfant_admin_model.dart';
import 'package:p_tits_pas/services/auth_service.dart';
import 'package:p_tits_pas/services/user_service.dart';
import 'package:p_tits_pas/utils/staff_deletion_rights.dart';
import 'package:p_tits_pas/widgets/admin/common/admin_child_detail_modal.dart';
import 'package:p_tits_pas/widgets/admin/common/admin_enfant_user_card.dart';
import 'package:p_tits_pas/widgets/admin/common/suppression_confirm_dialog.dart';
import 'package:p_tits_pas/widgets/admin/common/user_list.dart';

/// Onglet liste globale des enfants (doc 28 §6.2, ticket #137).
class EnfantManagementWidget extends StatefulWidget {
  final String searchQuery;
  final String? statusFilter;

  const EnfantManagementWidget({
    super.key,
    required this.searchQuery,
    this.statusFilter,
  });

  @override
  State<EnfantManagementWidget> createState() => _EnfantManagementWidgetState();
}

class _EnfantManagementWidgetState extends State<EnfantManagementWidget> {
  bool _isLoading = false;
  String? _error;
  List<EnfantAdminModel> _enfants = [];
  bool _canDelete = false;

  @override
  void initState() {
    super.initState();
    _loadRights();
    _loadEnfants();
  }

  Future<void> _loadRights() async {
    final user = await AuthService.getCurrentUser();
    if (!mounted) return;
    setState(() => _canDelete = canDeleteMetier(user?.role));
  }

  Future<void> _loadEnfants() async {
    setState(() {
      _isLoading = true;
      _error = null;
    });
    try {
      final list = await UserService.getEnfants();
      if (!mounted) return;
      setState(() {
        _enfants = list;
        _isLoading = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = e.toString();
        _isLoading = false;
      });
    }
  }

  Future<void> _openEnfant(EnfantAdminModel enfant) async {
    await showDialog<void>(
      context: context,
      builder: (ctx) => AdminChildDetailModal(
        enfant: enfant,
        onSaved: _loadEnfants,
        onDeleted: _loadEnfants,
      ),
    );
  }

  Future<({String? numero, String famille, bool isLast, String? amLabel})>
      _resolveContext(
    EnfantAdminModel enfant,
  ) async {
    String? amLabel;
    try {
      final am = await UserService.findAmForEnfant(enfant.id);
      if (am != null) {
        final label = formatDossierPersonLabel(
          nom: am.user.nom,
          prenom: am.user.prenom,
          email: am.user.email,
        );
        if (label.isNotEmpty) amLabel = label;
      }
    } catch (_) {}

    final parentId = enfant.parentLinks
        .map((l) => l.parentId.trim())
        .firstWhere((id) => id.isNotEmpty, orElse: () => '');
    if (parentId.isEmpty) {
      return (numero: null, famille: '', isLast: true, amLabel: amLabel);
    }
    try {
      final parent = await UserService.getParent(parentId);
      final num = (parent.user.numeroDossier ?? '').trim();
      final famille = parent.user.fullName.isNotEmpty
          ? parent.user.fullName
          : parent.user.email;
      if (num.isEmpty) {
        return (
          numero: null,
          famille: famille,
          isLast: true,
          amLabel: amLabel,
        );
      }
      final dossier = await UserService.getDossier(num);
      if (!dossier.isFamily) {
        return (
          numero: num,
          famille: famille,
          isLast: true,
          amLabel: amLabel,
        );
      }
      final n = dossier.asFamily.enfants.length;
      final names = dossier.asFamily.parents
          .map((p) => formatDossierPersonLabel(
                nom: p.nom,
                prenom: p.prenom,
                email: p.email,
              ))
          .where((s) => s.isNotEmpty)
          .join(' - ');
      return (
        numero: num,
        famille: names.isNotEmpty ? names : famille,
        isLast: n <= 1,
        amLabel: amLabel,
      );
    } catch (_) {
      return (numero: null, famille: '', isLast: false, amLabel: amLabel);
    }
  }

  Future<void> _confirmDelete(EnfantAdminModel enfant) async {
    final ctx = await _resolveContext(enfant);
    if (!mounted) return;

    bool deleteDossier = false;
    if (ctx.isLast && (ctx.numero ?? '').isNotEmpty) {
      final choice = await showDernierEnfantSuppressionDialog(
        context,
        enfantName: enfant.fullName,
        familleLabel: ctx.famille,
        numeroDossier: ctx.numero!,
        amLabel: ctx.amLabel,
      );
      if (choice == null || !mounted) return;
      deleteDossier =
          choice == DernierEnfantSuppressionChoice.dossierAussi;
    } else {
      final confirmed = await showSuppressionConfirmDialog(
        context,
        title: 'Supprimer l\'enfant',
        subtitle: (ctx.numero ?? '').isEmpty
            ? null
            : 'Dossier ${ctx.numero}',
        people: [SuppressionPersonLine.enfant(enfant.fullName)],
        footnotes: enfantSuppressionFootnotes(
          numeroDossier: ctx.numero,
          familleLabel: ctx.famille,
          amLabel: ctx.amLabel,
        ),
      );
      if (!confirmed || !mounted) return;
    }

    try {
      final result = await UserService.deleteEnfant(
        enfant.id,
        deleteDossier: deleteDossier,
      );
      if (!mounted) return;
      final msg = (result['message'] ?? 'Enfant supprimé.').toString();
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(msg)));
      await _loadEnfants();
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            e is Exception
                ? e.toString().replaceFirst('Exception: ', '')
                : 'Erreur suppression',
          ),
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final query = widget.searchQuery.toLowerCase();
    final filtered = _enfants.where((e) {
      final matchesName = e.fullName.toLowerCase().contains(query);
      final matchesStatus = widget.statusFilter == null ||
          normalizeEnfantStatus(e.status) ==
              normalizeEnfantStatus(widget.statusFilter);
      return matchesName && matchesStatus;
    }).toList()
      ..sort((a, b) {
        // Orphelins (#157) en tête, puis ordre alphabétique.
        final ao = a.hasNoResponsable ? 0 : 1;
        final bo = b.hasNoResponsable ? 0 : 1;
        if (ao != bo) return ao.compareTo(bo);
        return a.fullName.toLowerCase().compareTo(b.fullName.toLowerCase());
      });

    return UserList(
      isLoading: _isLoading,
      error: _error,
      isEmpty: filtered.isEmpty,
      emptyMessage: 'Aucun enfant trouvé.',
      itemCount: filtered.length,
      itemBuilder: (context, index) {
        final enfant = filtered[index];
        return AdminEnfantUserCard.fromEnfant(
          enfant,
          onCardTap: () => _openEnfant(enfant),
          actions: [
            IconButton(
              icon: const Icon(Icons.visibility_outlined),
              tooltip: 'Voir / modifier',
              onPressed: () => _openEnfant(enfant),
            ),
            if (_canDelete)
              suppressionIconButton(
                onPressed: () => _confirmDelete(enfant),
              ),
          ],
        );
      },
    );
  }
}