import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:sighej/models/match_result.dart';

const _baseUrl = String.fromEnvironment('API_URL', defaultValue: 'http://10.0.2.2:8000');

/// Registers the user's profile with the backend session store.
Future<void> registerSession(
  String bleToken,
  List<String> interests, {
  String name = '',
  String tagline = '',
}) async {
  final response = await http.post(
    Uri.parse('$_baseUrl/session'),
    headers: {'Content-Type': 'application/json'},
    body: jsonEncode({
      'ble_token': bleToken,
      'interests': interests,
      if (name.isNotEmpty) 'name': name,
      if (tagline.isNotEmpty) 'tagline': tagline,
    }),
  );
  if (response.statusCode != 200) {
    throw Exception('Failed to register session: ${response.statusCode}');
  }
}

/// Reports a detected BLE token to the backend and returns the match result.
/// Returns null if the backend returns a non-200 status (soft failure).
Future<MatchResult?> reportMatch(String ownToken, String detectedToken) async {
  try {
    final response = await http.post(
      Uri.parse('$_baseUrl/match'),
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({'own_token': ownToken, 'detected_token': detectedToken}),
    );
    if (response.statusCode != 200) return null;
    return MatchResult.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
  } catch (_) {
    return null;
  }
}