import 'package:flutter/material.dart';
import 'package:p_tits_pas/models/enfant_admin_model.dart';
import 'package:p_tits_pas/services/user_service.dart';

/// Fiche enfant consultation / édition (ticket #138).
class AdminChildDetailModal extends StatefulWidget {
  final EnfantAdminModel enfant;
  final VoidCallback? onSaved;

  const AdminChildDetailModal({
    super.key,
    required this.enfant,
    this.onSaved,
  });

  @override
  State<AdminChildDetailModal> createState() => _AdminChildDetailModalState();
}

class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
  late final TextEditingController _prenomCtrl;
  late final TextEditingController _nomCtrl;
  late final TextEditingController _birthCtrl;
  late final TextEditingController _dueCtrl;
  late String _status;
  late String _gender;
  late bool _consentPhoto;
  late bool _isMultiple;
  bool _dirty = false;
  bool _saving = false;

  static const _statuses = ['a_naitre', 'actif', 'scolarise'];
  static const _genders = ['H', 'F', 'Autre'];

  @override
  void initState() {
    super.initState();
    final e = widget.enfant;
    _prenomCtrl = TextEditingController(text: e.firstName ?? '');
    _nomCtrl = TextEditingController(text: e.lastName ?? '');
    _birthCtrl = TextEditingController(text: e.birthDate ?? '');
    _dueCtrl = TextEditingController(text: e.dueDate ?? '');
    _status = _statuses.contains(e.status) ? e.status : 'actif';
    _gender = _genders.contains(e.gender) ? e.gender! : 'H';
    _consentPhoto = e.consentPhoto;
    _isMultiple = e.isMultiple;
    for (final c in [_prenomCtrl, _nomCtrl, _birthCtrl, _dueCtrl]) {
      c.addListener(_markDirty);
    }
  }

  @override
  void dispose() {
    for (final c in [_prenomCtrl, _nomCtrl, _birthCtrl, _dueCtrl]) {
      c.dispose();
    }
    super.dispose();
  }

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

  Future<void> _save() async {
    if (!_dirty) return;
    setState(() => _saving = true);
    try {
      await UserService.updateEnfant(
        enfantId: widget.enfant.id,
        body: {
          'first_name': _prenomCtrl.text.trim(),
          'last_name': _nomCtrl.text.trim(),
          'status': _status,
          'gender': _gender,
          if (_birthCtrl.text.trim().isNotEmpty) 'birth_date': _birthCtrl.text.trim(),
          if (_dueCtrl.text.trim().isNotEmpty) 'due_date': _dueCtrl.text.trim(),
          'consent_photo': _consentPhoto,
          'is_multiple': _isMultiple,
        },
      );
      if (!mounted) return;
      setState(() {
        _dirty = false;
        _saving = false;
      });
      widget.onSaved?.call();
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Fiche enfant enregistrée')),
      );
    } catch (e) {
      if (!mounted) return;
      setState(() => _saving = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final parents = widget.enfant.parentLinks
        .map((l) => l.parentName ?? l.parentId)
        .where((s) => s.isNotEmpty)
        .join(', ');

    return Dialog(
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 560, maxHeight: 640),
        child: Padding(
          padding: const EdgeInsets.all(18),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Row(
                children: [
                  Expanded(
                    child: Text(
                      widget.enfant.fullName,
                      style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
                    ),
                  ),
                  IconButton(
                    onPressed: () => Navigator.of(context).pop(),
                    icon: const Icon(Icons.close),
                  ),
                ],
              ),
              if (parents.isNotEmpty)
                Padding(
                  padding: const EdgeInsets.only(bottom: 8),
                  child: Text('Responsables : $parents', style: const TextStyle(color: Colors.black54)),
                ),
              const Divider(),
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    children: [
                      _rowField('Prénom', TextField(controller: _prenomCtrl, decoration: _decoration())),
                      _rowField('Nom', TextField(controller: _nomCtrl, decoration: _decoration())),
                      _rowDropdown(
                        'Statut',
                        _status,
                        _statuses.map((s) => MapEntry(s, _statusLabel(s))).toList(),
                        (v) => setState(() {
                          _status = v;
                          _dirty = true;
                        }),
                      ),
                      _rowDropdown(
                        'Genre',
                        _gender,
                        _genders.map((g) => MapEntry(g, g)).toList(),
                        (v) => setState(() {
                          _gender = v;
                          _dirty = true;
                        }),
                      ),
                      _rowField(
                        'Date naissance',
                        TextField(
                          controller: _birthCtrl,
                          decoration: _decoration(hint: 'AAAA-MM-JJ'),
                        ),
                      ),
                      _rowField(
                        'Date prévue',
                        TextField(
                          controller: _dueCtrl,
                          decoration: _decoration(hint: 'AAAA-MM-JJ'),
                        ),
                      ),
                      SwitchListTile(
                        contentPadding: EdgeInsets.zero,
                        title: const Text('Consentement photo'),
                        value: _consentPhoto,
                        onChanged: (v) => setState(() {
                          _consentPhoto = v;
                          _dirty = true;
                        }),
                      ),
                      SwitchListTile(
                        contentPadding: EdgeInsets.zero,
                        title: const Text('Naissance multiple'),
                        value: _isMultiple,
                        onChanged: (v) => setState(() {
                          _isMultiple = v;
                          _dirty = true;
                        }),
                      ),
                    ],
                  ),
                ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton(
                    onPressed: () => 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: const Text('Sauvegarder'),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }

  InputDecoration _decoration({String? hint}) {
    return InputDecoration(isDense: true, border: const OutlineInputBorder(), hintText: hint);
  }

  Widget _rowField(String label, Widget field) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 120,
            child: Padding(
              padding: const EdgeInsets.only(top: 12),
              child: Text(label, style: const TextStyle(fontWeight: FontWeight.w600)),
            ),
          ),
          Expanded(child: field),
        ],
      ),
    );
  }

  Widget _rowDropdown(
    String label,
    String value,
    List<MapEntry<String, String>> items,
    ValueChanged<String> onChanged,
  ) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          SizedBox(
            width: 120,
            child: Text(label, style: const TextStyle(fontWeight: FontWeight.w600)),
          ),
          Expanded(
            child: DropdownButtonFormField<String>(
              value: items.any((e) => e.key == value) ? value : items.first.key,
              decoration: _decoration(),
              items: items
                  .map((e) => DropdownMenuItem(value: e.key, child: Text(e.value)))
                  .toList(),
              onChanged: (v) {
                if (v != null) onChanged(v);
              },
            ),
          ),
        ],
      ),
    );
  }

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