import 'dart:convert';

import 'package:http/http.dart' as http;
import 'package:package_info_plus/package_info_plus.dart';
import 'package:url_launcher/url_launcher.dart';

/// Vérifie s'il existe une version plus récente (API `/version`) et, si oui,
/// ouvre l'URL de l'APK (le navigateur télécharge, l'utilisateur installe —
/// robuste, sans dépendance de packaging fragile).
class UpdateService {
  UpdateService(this._baseUrl);
  final Future<String> _baseUrl;

  Future<UpdateInfo?> check() async {
    try {
      final base = await _baseUrl;
      final res = await http.get(Uri.parse('$base/version')).timeout(const Duration(seconds: 6));
      if (res.statusCode != 200) return null;
      final data = jsonDecode(res.body) as Map<String, dynamic>;
      final remote = data['version_code'] as int? ?? 0;
      final info = await PackageInfo.fromPlatform();
      final current = int.tryParse(info.buildNumber) ?? 0;
      if (remote > current) {
        return UpdateInfo(
          version: data['version'] as String? ?? '?',
          apkUrl: data['apk_url'] as String? ?? '$base/download/apk',
          notes: data['notes'] as String? ?? '',
        );
      }
    } catch (_) {/* pas de réseau / pas d'update → on ignore */}
    return null;
  }

  Future<bool> apply(UpdateInfo info) async {
    final uri = Uri.parse(info.apkUrl);
    if (!await canLaunchUrl(uri)) return false;
    return launchUrl(uri, mode: LaunchMode.externalApplication);
  }
}

class UpdateInfo {
  UpdateInfo({required this.version, required this.apkUrl, required this.notes});
  final String version;
  final String apkUrl;
  final String notes;
}