import 'package:ac_web/Api/ApiClient.dart';
import 'package:ac_web/Api/ApiConfig.dart';
import 'package:ac_web/Api/Services/AgentsService.dart';
import 'package:ac_web/Api/Services/ReportsService.dart';
import 'package:http/http.dart' as http;

/// Single entry point for the whole Rest API of the Artificial Company backend.
///
/// Usage:
/// ```dart
/// // once during startup, e.g. in main.dart
/// AcApi.configure(const ApiConfig(host: '192.168.0.10', port: 5000));
///
/// // anywhere in the app
/// final agents = await AcApi.instance.agents.getAgents();
/// ```
class AcApi {
  AcApi({ApiConfig config = ApiConfig.development, http.Client? httpClient})
      : mClient = ApiClient(config: config, httpClient: httpClient);

  final ApiClient mClient;

  static AcApi? _instance;

  /// Globally shared instance. Created lazily with [ApiConfig.development] if
  /// [configure] was not called before.
  static AcApi get instance => _instance ??= AcApi();

  /// Replaces the shared instance, e.g. during app startup or in tests.
  static AcApi configure(ApiConfig config, {http.Client? httpClient}) {
    _instance?.dispose();
    return _instance = AcApi(config: config, httpClient: httpClient);
  }

  /// Drops the shared instance. Mainly useful for tests.
  static void reset() {
    _instance?.dispose();
    _instance = null;
  }

  ApiClient get client => mClient;

  ApiConfig get config => mClient.config;

  AgentsService? _agents;
  ReportsService? _reports;

  /// `/agents` controller.
  AgentsService get agents => _agents ??= AgentsService(mClient);

  /// `/reports` controller.
  ReportsService get reports => _reports ??= ReportsService(mClient);

  void dispose() {
    mClient.dispose();
  }
}