import 'package:p_tits_pas/models/card_assets.dart';
import 'package:p_tits_pas/models/dossier_unifie.dart';
import 'package:p_tits_pas/models/reprise_dossier.dart';
import 'package:p_tits_pas/models/user_registration_data.dart';
import 'package:p_tits_pas/services/api/api_config.dart';

/// Mapping GET reprise-dossier → modèles wizard. Ticket #112.
class RepriseMapper {
  RepriseMapper._();

  static const List<CardColorVertical> _childCardColors = [
    CardColorVertical.lavender,
    CardColorVertical.pink,
    CardColorVertical.peach,
    CardColorVertical.lime,
    CardColorVertical.red,
    CardColorVertical.green,
    CardColorVertical.blue,
  ];

  static ParentData parentFromDossier(ParentDossier p) {
    return ParentData(
      firstName: p.prenom ?? '',
      lastName: p.nom ?? '',
      phone: p.telephone ?? '',
      email: p.email,
      address: p.adresse ?? '',
      postalCode: p.codePostal ?? '',
      city: p.ville ?? '',
      password: '',
    );
  }

  static ChildData childFromEnfant(EnfantDossier e, int index) {
    final isUnborn = e.status == 'a_naitre';
    final dob = isUnborn
        ? isoToDdMmYyyy(e.dueDate)
        : isoToDdMmYyyy(e.birthDate);
    final photo = e.photoUrl?.trim();
    final hasPhoto = photo != null && photo.isNotEmpty;
    return ChildData(
      firstName: e.firstName ?? '',
      lastName: e.lastName ?? '',
      dob: dob,
      genre: e.gender ?? '',
      // Inscription initiale exigeait la coche pour envoyer la photo ; le back
      // ne persistait pas toujours consent_photo — on pré-coche si photo en base.
      photoConsent: e.consentPhoto || hasPhoto,
      multipleBirth: e.estMultiple,
      isUnbornChild: isUnborn,
      cardColor: _childCardColors[index % _childCardColors.length],
      repriseChildId: e.id,
      existingPhotoUrl: photo != null && photo.isNotEmpty
          ? ApiConfig.absoluteMediaUrl(photo)
          : null,
    );
  }

  static void applyParentDossier(UserRegistrationData data, RepriseDossier dossier) {
    ParentDossier? titulaire;
    ParentDossier? coParent;

    if (dossier.parents.isNotEmpty) {
      for (final p in dossier.parents) {
        if (p.id == dossier.id) {
          titulaire = p;
        } else {
          coParent = p;
        }
      }
      titulaire ??= dossier.parents.first;
      if (coParent == null && dossier.parents.length > 1) {
        coParent = dossier.parents.firstWhere(
          (p) => p.id != titulaire!.id,
          orElse: () => dossier.parents.last,
        );
      }
    }

    final p1 = titulaire != null
        ? parentFromDossier(titulaire)
        : ParentData(
            firstName: dossier.prenom ?? '',
            lastName: dossier.nom ?? '',
            phone: dossier.telephone ?? '',
            email: dossier.email,
            address: dossier.adresse ?? '',
            postalCode: dossier.codePostal ?? '',
            city: dossier.ville ?? '',
            password: '',
          );

    final children = dossier.enfants
        .asMap()
        .entries
        .map((e) => childFromEnfant(e.value, e.key))
        .toList();

    data.resetForReprise(
      parent1Data: p1,
      parent2Data: coParent != null ? parentFromDossier(coParent) : null,
      childrenData: children,
      motivation: dossier.texteMotivation ?? '',
    );
  }

  static DateTime? parseIsoDate(String? raw) {
    if (raw == null || raw.trim().isEmpty) return null;
    try {
      return DateTime.parse(raw.trim());
    } catch (_) {
      return null;
    }
  }

  static String isoToDdMmYyyy(String? iso) {
    final dt = parseIsoDate(iso);
    if (dt == null) return '';
    return '${dt.day.toString().padLeft(2, '0')}/'
        '${dt.month.toString().padLeft(2, '0')}/'
        '${dt.year}';
  }
}