import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:shared_preferences/shared_preferences.dart';

const String _overrideKey = 'api_base_url_override';

String? _override;

String _fromEnv() {
  final raw = dotenv.env['API_BASE_URL']?.trim() ?? '';
  final url = raw.replaceAll(' ', '');
  if (url.isEmpty) return 'http://localhost:3001';
  return url.endsWith('/') ? url.substring(0, url.length - 1) : url;
}

/// API base URL (no trailing slash). Uses in-app override if set, else .env.
/// Strips spaces so accidental spaces don't break DNS.
String get apiBaseUrl {
  if (_override != null && _override!.trim().isNotEmpty) {
    final u = _override!.trim().replaceAll(' ', '');
    if (u.isNotEmpty) {
      return u.endsWith('/') ? u.substring(0, u.length - 1) : u;
    }
  }
  return _fromEnv();
}

/// Load saved override from disk. Call once at startup.
Future<void> loadApiBaseUrlOverride() async {
  final prefs = await SharedPreferences.getInstance();
  _override = prefs.getString(_overrideKey);
}

/// Save or clear the in-app base URL override. Pass null or empty to use .env again.
Future<void> setApiBaseUrlOverride(String? value) async {
  final prefs = await SharedPreferences.getInstance();
  if (value == null || value.trim().isEmpty) {
    await prefs.remove(_overrideKey);
    _override = null;
    return;
  }
  final u = value.trim().replaceAll(' ', '');
  final withoutSlash = u.endsWith('/') ? u.substring(0, u.length - 1) : u;
  await prefs.setString(_overrideKey, withoutSlash);
  _override = withoutSlash;
}

/// Current default from .env (ignoring override). For display only.
String get apiBaseUrlDefault => _fromEnv();