import 'dart:convert';

import 'package:http/http.dart' as http;
import 'package:p_tits_pas/models/carte_bulle.dart';
import 'package:p_tits_pas/services/api/api_config.dart';
import 'package:p_tits_pas/services/api/tokenService.dart';

/// Accès API Cartes (file d'attention) — tickets #173 / #194.
/// - GET    /cards?placementId=
/// - POST   /cards/:id/respond
class CardsService {
  static Future<Map<String, String>> _headers() async {
    final token = await TokenService.getToken();
    return token != null
        ? ApiConfig.authHeaders(token)
        : Map<String, String>.from(ApiConfig.headers);
  }

  static String _extractError(String body, String fallback) {
    try {
      final decoded = jsonDecode(body);
      if (decoded is Map<String, dynamic>) {
        final message = decoded['message'];
        if (message is String && message.trim().isNotEmpty) {
          return message;
        }
        if (message is Map && message['message'] is String) {
          return message['message'] as String;
        }
      }
    } catch (_) {}
    return fallback;
  }

  /// Feed de bulles pour l'utilisateur (filtré par couple / placement).
  static Future<List<CarteBulle>> lister({String? placementId}) async {
    final query = <String, String>{};
    if (placementId != null && placementId.isNotEmpty) {
      query['placementId'] = placementId;
    }
    final uri = Uri.parse(
      '${ApiConfig.baseUrl}${ApiConfig.cards}',
    ).replace(queryParameters: query.isEmpty ? null : query);

    final response = await http.get(uri, headers: await _headers());
    if (response.statusCode != 200) {
      throw Exception(
        _extractError(response.body, 'Erreur chargement des cartes'),
      );
    }

    final decoded = jsonDecode(response.body);
    final list = (decoded is Map ? decoded['items'] as List? : null) ?? const [];
    return list
        .whereType<Map>()
        .map((e) => CarteBulle.fromJson(Map<String, dynamic>.from(e)))
        .toList();
  }

  /// Répondre : accept | refuse | ack.
  static Future<CarteBulle> repondre({
    required String cardId,
    required String action,
    String? comment,
  }) async {
    final response = await http.post(
      Uri.parse(
        '${ApiConfig.baseUrl}${ApiConfig.cards}/$cardId/respond',
      ),
      headers: await _headers(),
      body: jsonEncode({
        'action': action,
        if (comment != null && comment.trim().isNotEmpty)
          'comment': comment.trim(),
      }),
    );

    if (response.statusCode != 200) {
      throw Exception(
        _extractError(response.body, 'Erreur lors de la réponse'),
      );
    }

    final decoded = jsonDecode(response.body);
    return CarteBulle.fromJson(Map<String, dynamic>.from(decoded as Map));
  }
}