import 'package:flutter/material.dart';
import 'package:p_tits_pas/models/enfant_admin_model.dart';
import 'package:p_tits_pas/models/parent_child_summary.dart';
import 'package:p_tits_pas/models/parent_model.dart';
import 'package:p_tits_pas/services/user_service.dart';
import 'package:p_tits_pas/utils/phone_utils.dart';
import 'package:p_tits_pas/widgets/admin/common/admin_child_detail_modal.dart';

/// Fiche parent éditable (doc 28 §6.1, tickets #131 / #138).
class AdminParentEditModal extends StatefulWidget {
  final ParentModel parent;
  final VoidCallback? onSaved;

  const AdminParentEditModal({
    super.key,
    required this.parent,
    this.onSaved,
  });

  @override
  State<AdminParentEditModal> createState() => _AdminParentEditModalState();
}

class _AdminParentEditModalState extends State<AdminParentEditModal> {
  late final TextEditingController _nomCtrl;
  late final TextEditingController _prenomCtrl;
  late final TextEditingController _emailCtrl;
  late final TextEditingController _telCtrl;
  late final TextEditingController _adresseCtrl;
  late final TextEditingController _villeCtrl;
  late final TextEditingController _cpCtrl;

  late String _statut;
  late List<ParentChildSummary> _children;
  bool _saving = false;
  bool _dirty = false;

  static const _statuts = ['actif', 'en_attente', 'suspendu', 'refuse'];

  @override
  void initState() {
    super.initState();
    final u = widget.parent.user;
    _nomCtrl = TextEditingController(text: u.nom ?? '');
    _prenomCtrl = TextEditingController(text: u.prenom ?? '');
    _emailCtrl = TextEditingController(text: u.email);
    _telCtrl = TextEditingController(text: u.telephone ?? '');
    _adresseCtrl = TextEditingController(text: u.adresse ?? '');
    _villeCtrl = TextEditingController(text: u.ville ?? '');
    _cpCtrl = TextEditingController(text: u.codePostal ?? '');
    _statut = u.statut ?? 'en_attente';
    _children = List.of(widget.parent.children);
    for (final c in [_nomCtrl, _prenomCtrl, _emailCtrl, _telCtrl, _adresseCtrl, _villeCtrl, _cpCtrl]) {
      c.addListener(_markDirty);
    }
  }

  @override
  void dispose() {
    for (final c in [_nomCtrl, _prenomCtrl, _emailCtrl, _telCtrl, _adresseCtrl, _villeCtrl, _cpCtrl]) {
      c.dispose();
    }
    super.dispose();
  }

  void _markDirty() {
    if (!_dirty) setState(() => _dirty = true);
  }

  String _displayStatus(String status) {
    switch (status) {
      case 'actif':
        return 'Actif';
      case 'en_attente':
        return 'En attente';
      case 'suspendu':
        return 'Suspendu';
      case 'refuse':
        return 'Refusé';
      default:
        return status;
    }
  }

  Future<void> _save() async {
    if (!_dirty) return;
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Confirmer'),
        content: const Text('Enregistrer les modifications de la fiche parent ?'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Annuler')),
          ElevatedButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('Sauvegarder')),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;

    setState(() => _saving = true);
    try {
      await UserService.updateParentFiche(
        parentUserId: widget.parent.user.id,
        body: {
          'nom': _nomCtrl.text.trim(),
          'prenom': _prenomCtrl.text.trim(),
          'email': _emailCtrl.text.trim(),
          'telephone': _telCtrl.text.trim(),
          'adresse': _adresseCtrl.text.trim(),
          'ville': _villeCtrl.text.trim(),
          'code_postal': _cpCtrl.text.trim(),
          'statut': _statut,
        },
      );
      if (!mounted) return;
      setState(() {
        _dirty = false;
        _saving = false;
      });
      widget.onSaved?.call();
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Fiche parent enregistrée')),
      );
    } catch (e) {
      if (!mounted) return;
      setState(() => _saving = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
    }
  }

  Future<void> _openChild(ParentChildSummary child) async {
    try {
      final enfant = await UserService.getEnfant(child.id);
      if (!mounted) return;
      await showDialog<void>(
        context: context,
        builder: (ctx) => AdminChildDetailModal(
          enfant: enfant,
          onSaved: () async {
            await _reloadChildren();
          },
        ),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
    }
  }

  Future<void> _reloadChildren() async {
    try {
      final refreshed = await UserService.getParent(widget.parent.user.id);
      if (!mounted) return;
      setState(() => _children = List.of(refreshed.children));
    } catch (_) {}
  }

  Future<void> _detachChild(ParentChildSummary child) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Détacher l\'enfant'),
        content: Text(
          'Retirer ${child.fullName} de la fiche de ce parent ?\n(L\'enfant ne sera pas supprimé.)',
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Annuler')),
          ElevatedButton(
            onPressed: () => Navigator.pop(ctx, true),
            style: ElevatedButton.styleFrom(backgroundColor: Colors.red.shade700),
            child: const Text('Détacher'),
          ),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;

    try {
      final updated = await UserService.detachEnfantFromParent(
        parentUserId: widget.parent.user.id,
        enfantId: child.id,
      );
      if (!mounted) return;
      setState(() => _children = List.of(updated.children));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Enfant détaché')),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
    }
  }

  Future<void> _attachChild() async {
    List<EnfantAdminModel> all;
    try {
      all = await UserService.getEnfants();
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
      return;
    }

    final linkedIds = _children.map((c) => c.id).toSet();
    final candidates = all.where((e) => !linkedIds.contains(e.id)).toList();
    if (candidates.isEmpty) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Aucun enfant disponible à rattacher')),
      );
      return;
    }

    if (!mounted) return;
    final selected = await showDialog<EnfantAdminModel>(
      context: context,
      builder: (ctx) => SimpleDialog(
        title: const Text('Rattacher un enfant'),
        children: candidates
            .map(
              (e) => SimpleDialogOption(
                onPressed: () => Navigator.pop(ctx, e),
                child: Text(e.fullName),
              ),
            )
            .toList(),
      ),
    );
    if (selected == null || !mounted) return;

    try {
      final updated = await UserService.attachEnfantToParent(
        parentUserId: widget.parent.user.id,
        enfantId: selected.id,
      );
      if (!mounted) return;
      setState(() => _children = List.of(updated.children));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Enfant rattaché')),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
    }
  }

  Widget _field(String label, TextEditingController ctrl, {TextInputType? keyboard}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 130,
            child: Padding(
              padding: const EdgeInsets.only(top: 12),
              child: Text(label, style: const TextStyle(fontWeight: FontWeight.w600)),
            ),
          ),
          Expanded(
            child: TextFormField(
              controller: ctrl,
              keyboardType: keyboard,
              decoration: const InputDecoration(isDense: true, border: OutlineInputBorder()),
            ),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final numero = widget.parent.user.numeroDossier;
    return Dialog(
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 680, maxHeight: 720),
        child: Padding(
          padding: const EdgeInsets.all(18),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Row(
                children: [
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          widget.parent.user.fullName.isEmpty
                              ? 'Parent'
                              : widget.parent.user.fullName,
                          style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
                        ),
                        Text(widget.parent.user.email, style: const TextStyle(color: Colors.black54)),
                      ],
                    ),
                  ),
                  IconButton(
                    onPressed: () => Navigator.of(context).pop(),
                    icon: const Icon(Icons.close),
                  ),
                ],
              ),
              const Divider(),
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      if (numero != null && numero.isNotEmpty)
                        Padding(
                          padding: const EdgeInsets.symmetric(vertical: 6),
                          child: Row(
                            children: [
                              const SizedBox(
                                width: 130,
                                child: Text('N° dossier', style: TextStyle(fontWeight: FontWeight.w600)),
                              ),
                              Expanded(child: Text(numero)),
                            ],
                          ),
                        ),
                      Padding(
                        padding: const EdgeInsets.symmetric(vertical: 6),
                        child: Row(
                          children: [
                            const SizedBox(
                              width: 130,
                              child: Text('Statut', style: TextStyle(fontWeight: FontWeight.w600)),
                            ),
                            Expanded(
                              child: DropdownButtonFormField<String>(
                                value: _statuts.contains(_statut) ? _statut : _statuts.first,
                                decoration: const InputDecoration(isDense: true, border: OutlineInputBorder()),
                                items: _statuts
                                    .map(
                                      (s) => DropdownMenuItem(
                                        value: s,
                                        child: Text(_displayStatus(s)),
                                      ),
                                    )
                                    .toList(),
                                onChanged: (v) {
                                  if (v == null) return;
                                  setState(() {
                                    _statut = v;
                                    _dirty = true;
                                  });
                                },
                              ),
                            ),
                          ],
                        ),
                      ),
                      _field('Nom', _nomCtrl),
                      _field('Prénom', _prenomCtrl),
                      _field('Email', _emailCtrl, keyboard: TextInputType.emailAddress),
                      _field('Téléphone', _telCtrl, keyboard: TextInputType.phone),
                      if (_telCtrl.text.isNotEmpty)
                        Padding(
                          padding: const EdgeInsets.only(left: 130, bottom: 4),
                          child: Text(
                            formatPhoneForDisplay(_telCtrl.text),
                            style: const TextStyle(fontSize: 12, color: Colors.black54),
                          ),
                        ),
                      _field('Adresse', _adresseCtrl),
                      _field('Ville', _villeCtrl),
                      _field('Code postal', _cpCtrl),
                      const SizedBox(height: 12),
                      Text(
                        'Nombre d\'enfants : ${_children.length}',
                        style: const TextStyle(fontWeight: FontWeight.w600),
                      ),
                      const SizedBox(height: 8),
                      Container(
                        decoration: BoxDecoration(
                          border: Border.all(color: Colors.grey.shade300),
                          borderRadius: BorderRadius.circular(8),
                        ),
                        padding: const EdgeInsets.all(8),
                        child: _children.isEmpty
                            ? const Text('Aucun enfant rattaché', style: TextStyle(color: Colors.black54))
                            : Column(
                                children: _children
                                    .map(
                                      (c) => ListTile(
                                        dense: true,
                                        contentPadding: EdgeInsets.zero,
                                        title: InkWell(
                                          onTap: () => _openChild(c),
                                          child: Text(
                                            c.fullName,
                                            style: const TextStyle(
                                              decoration: TextDecoration.underline,
                                              color: Colors.blue,
                                            ),
                                          ),
                                        ),
                                        subtitle: Text(_childStatusLabel(c.status)),
                                        trailing: IconButton(
                                          tooltip: 'Détacher',
                                          icon: Icon(Icons.link_off, color: Colors.orange.shade800),
                                          onPressed: () => _detachChild(c),
                                        ),
                                      ),
                                    )
                                    .toList(),
                              ),
                      ),
                      const SizedBox(height: 8),
                      Align(
                        alignment: Alignment.centerLeft,
                        child: TextButton.icon(
                          onPressed: _attachChild,
                          icon: const Icon(Icons.link),
                          label: const Text('Rattacher un enfant'),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 8),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton(
                    onPressed: _saving ? null : () => Navigator.of(context).pop(),
                    child: const Text('Fermer'),
                  ),
                  const SizedBox(width: 8),
                  ElevatedButton.icon(
                    onPressed: !_dirty || _saving ? null : _save,
                    icon: _saving
                        ? const SizedBox(
                            width: 16,
                            height: 16,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : const Icon(Icons.save),
                    label: Text(_dirty ? 'Sauvegarder' : 'Aucune modification'),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }

  String _childStatusLabel(String status) {
    switch (status) {
      case 'a_naitre':
        return 'À naître';
      case 'actif':
        return 'Actif';
      case 'scolarise':
        return 'Scolarisé';
      default:
        return status;
    }
  }
}