import 'dart:convert';

import 'package:shared_preferences/shared_preferences.dart';

import '../models/geofence_runtime_state.dart';

class GeofenceRuntimeStore {
  static const String _runtimeKey = 'ignis_geofence_runtime';

  Future<GeofenceRuntimeState> load() async {
    final prefs = await SharedPreferences.getInstance();
    final raw = prefs.getString(_runtimeKey);
    if (raw == null || raw.isEmpty) {
      return const GeofenceRuntimeState();
    }

    final decoded = jsonDecode(raw);
    if (decoded is! Map<String, dynamic>) {
      return const GeofenceRuntimeState();
    }

    return GeofenceRuntimeState.fromJson(decoded);
  }

  Future<void> save(GeofenceRuntimeState state) async {
    final prefs = await SharedPreferences.getInstance();
    final data = state.toJson();
    if (data.isEmpty) {
      await prefs.remove(_runtimeKey);
      return;
    }

    await prefs.setString(_runtimeKey, jsonEncode(data));
  }

  Future<GeofenceRuntimeState> armForHome(String homeId) async {
    final next = (await load()).armForHome(homeId);
    await save(next);
    return next;
  }

  Future<GeofenceRuntimeState> disarm() async {
    final next = (await load()).disarm();
    await save(next);
    return next;
  }

  Future<GeofenceRuntimeState> removeHome(String homeId) async {
    final next = (await load()).removeHome(homeId);
    await save(next);
    return next;
  }
}