peyawallet/lib/native/monero_library_loader.dart

import 'dart:io';

import 'package:logger/logger.dart';
import 'package:path/path.dart' as p;

import 'platform_adapter.dart';

class MoneroLibraryLoader {
  MoneroLibraryLoader({required this.logger, PlatformAdapter? adapter})
      : _adapter = adapter ?? const PlatformAdapter();

  final Logger logger;
  final PlatformAdapter _adapter;

  String locate() {
    final overridePath = Platform.environment['PEYA_LIBWALLET'] ??
        Platform.environment['PEYA_WALLET_LIB'] ??
        Platform.environment['SALVIUM_LIBWALLET'] ??
        Platform.environment['SALVIUM_WALLET_LIB'];
    if (overridePath != null && overridePath.isNotEmpty) {
      return _validatePath(overridePath);
    }

    final searchBases = <String>{
      Directory.current.path,
      p.dirname(Platform.resolvedExecutable),
    };

    for (final base in searchBases) {
      for (final root in _adapter.moneroLibrarySearchPaths()) {
        for (final libName in _adapter.moneroLibraryNames()) {
          final candidate = p.normalize(p.join(base, root, libName));
          if (File(candidate).existsSync()) {
            logger.i('Using Peya libwallet2_api_c from $candidate');
            return candidate;
          }
        }
      }
    }

    throw StateError(
      'Peya libwallet2_api_c not found. Set PEYA_LIBWALLET or build monero_c.',
    );
  }

  String _validatePath(String rawPath) {
    final resolved = p.normalize(rawPath);
    if (!File(resolved).existsSync()) {
      throw StateError('Peya libwallet2_api_c not found at $resolved');
    }
    logger.i('Using Peya libwallet2_api_c from $resolved');
    return resolved;
  }
}