import 'package:flutter/material.dart';
import 'package:p_tits_pas/models/dossier_list_item.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/dashboard/dossier_list_card.dart';
import 'package:p_tits_pas/widgets/dashboard/pending_validation_widget.dart';
import 'package:p_tits_pas/widgets/dashboard/common/suppression_confirm_dialog.dart';
import 'package:p_tits_pas/widgets/dashboard/validation_dossier_modal.dart';

/// Onglet permanent « Dossiers » (#153) : pending en haut + liste unifiée en bas.
class DossiersManagementWidget extends StatefulWidget {
  final String searchQuery;
  final VoidCallback? onRefresh;

  const DossiersManagementWidget({
    super.key,
    this.searchQuery = '',
    this.onRefresh,
  });

  @override
  State<DossiersManagementWidget> createState() =>
      _DossiersManagementWidgetState();
}

class _DossiersManagementWidgetState extends State<DossiersManagementWidget> {
  bool _loading = true;
  String? _error;
  List<DossierListItem> _all = [];
  Set<String> _pendingNumeros = {};
  int _pendingRefreshTick = 0;
  bool _canDelete = false;

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

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

  Future<void> _loadAll() async {
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      final parents = await UserService.getParents();
      final ams = await UserService.getAssistantesMaternelles();
      Map<String, bool> sansEnfant = {};
      try {
        sansEnfant = await UserService.getSansEnfantByNumero();
      } catch (_) {
        // Flag optionnel : ne bloque pas la liste.
      }
      if (!mounted) return;
      final items = <DossierListItem>[
        ...DossierListItem.fromParents(parents),
        ...DossierListItem.fromAssistantes(ams),
      ].map((item) {
        if (!item.isFamille) return item;
        final apiFlag = sansEnfant[item.numeroDossier] == true;
        final localEmpty = (item.enfantsCount ?? 0) == 0;
        return item.copyWith(
          sansEnfant: apiFlag || localEmpty || item.sansEnfant,
        );
      }).toList();
      items.sort((a, b) {
        // Dossiers sans enfant en tête (#160), comme orphelins #157.
        final ae = a.sansEnfant ? 0 : 1;
        final be = b.sansEnfant ? 0 : 1;
        if (ae != be) return ae.compareTo(be);
        final byNum = a.numeroDossier.compareTo(b.numeroDossier);
        if (byNum != 0) return byNum;
        return a.typeLabel.compareTo(b.typeLabel);
      });
      setState(() {
        _all = items;
        _loading = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = e is Exception
            ? e.toString().replaceFirst('Exception: ', '')
            : 'Erreur inconnue';
        _loading = false;
      });
    }
  }

  Future<void> _refreshEverything() async {
    setState(() => _pendingRefreshTick++);
    await _loadAll();
    widget.onRefresh?.call();
  }

  void _openDossier(String numeroDossier) {
    final num = numeroDossier.trim();
    if (num.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Numéro de dossier manquant.')),
      );
      return;
    }
    showDialog<void>(
      context: context,
      builder: (context) => ValidationDossierModal(
        numeroDossier: num,
        openAsEdit: true,
        onClose: () => Navigator.of(context).pop(),
        onSuccess: () {
          Navigator.of(context).pop();
          _refreshEverything();
        },
      ),
    );
  }

  Future<void> _confirmDeleteDossier(DossierListItem item) async {
    final num = item.numeroDossier.trim();
    if (num.isEmpty) return;

    var people = <SuppressionPersonLine>[];
    String? fallbackSummary;
    try {
      final dossier = await UserService.getDossier(num);
      if (dossier.isFamily) {
        final f = dossier.asFamily;
        people = suppressionPeopleFromDossier(
          isFamille: true,
          parents: f.parents
              .map((p) => (
                    nom: p.nom ?? '',
                    prenom: p.prenom ?? '',
                    email: p.email,
                  ))
              .toList(),
          enfants: f.enfants
              .map((e) => (
                    nom: e.lastName ?? '',
                    prenom: e.firstName ?? '',
                  ))
              .toList(),
        );
      } else {
        final am = dossier.asAm.user;
        people = suppressionPeopleFromDossier(
          isFamille: false,
          parents: const [],
          enfants: const [],
          amName: formatDossierPersonLabel(
            nom: am.nom,
            prenom: am.prenom,
            email: am.email,
          ),
        );
      }
    } catch (_) {
      fallbackSummary = item.isFamille
          ? 'Tous les parents et enfants rattachés seront supprimés.'
          : 'Le compte AM sera supprimé ; les enfants accueillis '
              'seront conservés.';
      if (item.namesLine.trim().isNotEmpty) {
        for (final part in item.namesLine.split(' - ')) {
          final label = part.trim();
          if (label.isEmpty) continue;
          people.add(SuppressionPersonLine(
            label: label,
            icon: item.isFamille
                ? Icons.supervisor_account_outlined
                : Icons.face,
            role: item.isFamille ? 'Parent' : 'AM',
          ));
        }
      }
    }

    if (!mounted) return;
    final confirmed = await showDossierSuppressionConfirmDialog(
      context,
      numeroDossier: num,
      isFamille: item.isFamille,
      people: people,
      fallbackSummary: fallbackSummary,
    );
    if (!confirmed || !mounted) return;

    try {
      final result = await UserService.deleteDossier(num);
      if (!mounted) return;
      final msg = (result['message'] ?? 'Dossier supprimé.').toString();
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(msg)));
      await _refreshEverything();
    } 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;
    // Pending uniquement en haut — exclus de « Tous les dossiers ».
    final filtered = _all
        .where((d) => !_pendingNumeros.contains(d.numeroDossier))
        .where((d) => (d.statut ?? '').toLowerCase() != 'en_attente')
        .where((d) => d.matchesQuery(query))
        .toList(growable: false);

    return RefreshIndicator(
      onRefresh: _refreshEverything,
      child: CustomScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        slivers: [
          SliverToBoxAdapter(
            child: PendingValidationWidget(
              key: ValueKey('pending-$_pendingRefreshTick'),
              searchQuery: query,
              compactWhenEmpty: true,
              canDelete: _canDelete,
              onPendingNumerosChanged: (nums) {
                if (!mounted) return;
                setState(() => _pendingNumeros = nums);
              },
              onRefresh: () {
                _loadAll();
                widget.onRefresh?.call();
              },
            ),
          ),
          SliverToBoxAdapter(
            child: Padding(
              padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
              child: Text(
                'Tous les dossiers',
                style: Theme.of(context).textTheme.titleMedium?.copyWith(
                      fontWeight: FontWeight.w600,
                      color: Colors.black87,
                    ),
              ),
            ),
          ),
          if (_loading)
            const SliverFillRemaining(
              hasScrollBody: false,
              child: Center(child: CircularProgressIndicator()),
            )
          else if (_error != null && _error!.isNotEmpty)
            SliverFillRemaining(
              hasScrollBody: false,
              child: Center(
                child: Padding(
                  padding: const EdgeInsets.all(24),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(_error!, style: const TextStyle(color: Colors.red)),
                      const SizedBox(height: 16),
                      ElevatedButton(
                        onPressed: _loadAll,
                        child: const Text('Réessayer'),
                      ),
                    ],
                  ),
                ),
              ),
            )
          else if (filtered.isEmpty)
            SliverToBoxAdapter(
              child: Padding(
                padding: const EdgeInsets.fromLTRB(24, 12, 24, 32),
                child: Text(
                  query.trim().isEmpty
                      ? 'Aucun dossier pour le moment.\n'
                          'Pour créer un dossier → onglet Parents (+ Parents) '
                          'ou Assistantes maternelles (+ Asmat).'
                      : 'Aucun dossier ne correspond à la recherche.',
                  textAlign: TextAlign.center,
                  style: TextStyle(color: Colors.grey.shade600, height: 1.4),
                ),
              ),
            )
          else
            SliverPadding(
              padding: const EdgeInsets.fromLTRB(16, 0, 16, 24),
              sliver: SliverList(
                delegate: SliverChildBuilderDelegate(
                  (context, index) {
                    final item = filtered[index];
                    return DossierListCard(
                      numeroDossier: item.numeroDossier,
                      namesLine: item.namesLine,
                      isFamille: item.isFamille,
                      photoUrl: item.photoUrl,
                      sansEnfant: item.sansEnfant,
                      enfantsCount: item.enfantsCount,
                      vigilanceTooltip: item.sansEnfant
                          ? 'Aucun enfant rattaché à ce dossier famille'
                          : null,
                      onOpen: () => _openDossier(item.numeroDossier),
                      onDelete: _canDelete
                          ? () => _confirmDeleteDossier(item)
                          : null,
                    );
                  },
                  childCount: filtered.length,
                ),
              ),
            ),
        ],
      ),
    );
  }
}