import 'dart:convert';
import 'dart:io';

import 'package:mirror_protocol/mirror_protocol.dart';

class LayoutPersistence {
  final String _path;

  LayoutPersistence({String? path})
      : _path = path ??
            '${Platform.environment['HOME']}/.config/mirror-os/dashboard_layout.json';

  Future<DashboardLayoutConfig> load() async {
    final file = File(_path);
    if (!await file.exists()) {
      return DashboardLayoutConfig.defaultLayout();
    }
    try {
      final content = await file.readAsString();
      final json = jsonDecode(content) as Map<String, dynamic>;
      return DashboardLayoutConfig.fromJson(json);
    } catch (_) {
      return DashboardLayoutConfig.defaultLayout();
    }
  }

  Future<void> save(DashboardLayoutConfig layout) async {
    final file = File(_path);
    final dir = file.parent;
    if (!await dir.exists()) {
      await dir.create(recursive: true);
    }
    final content = const JsonEncoder.withIndent('  ').convert(layout.toJson());
    await file.writeAsString(content);
  }
}