import 'package:flutter/foundation.dart';

enum MallBridgeTab { home, market, orders, profile }

class MallBridgeState {
  const MallBridgeState({
    this.ready = false,
    this.activeTab = MallBridgeTab.home,
    this.canGoBack = false,
  });

  final bool ready;
  final MallBridgeTab activeTab;
  final bool canGoBack;
}

class MallBridgeController {
  MallBridgeController._();

  static final instance = MallBridgeController._();

  final state = ValueNotifier(const MallBridgeState());
  Future<void> Function(MallBridgeTab tab, bool reselect)? _activateTab;
  Future<void> Function()? _goBack;

  void attach({
    required Future<void> Function(MallBridgeTab tab, bool reselect)
    activateTab,
    required Future<void> Function() goBack,
  }) {
    _activateTab = activateTab;
    _goBack = goBack;
  }

  void detach() {
    _activateTab = null;
    _goBack = null;
    state.value = const MallBridgeState();
  }

  void update(Map<dynamic, dynamic>? raw) {
    final tab = MallBridgeTab.values.firstWhere(
      (item) => item.name == raw?['activeTab'],
      orElse: () => MallBridgeTab.home,
    );
    state.value = MallBridgeState(
      ready: _asBool(raw?['ready']),
      activeTab: tab,
      canGoBack: _asBool(raw?['canGoBack']),
    );
  }

  Future<void> activate(MallBridgeTab tab, {bool reselect = false}) async {
    final current = state.value;
    state.value = MallBridgeState(
      ready: current.ready,
      activeTab: tab,
      canGoBack: current.canGoBack,
    );
    await _activateTab?.call(tab, reselect);
  }

  Future<void> goBack() async => await _goBack?.call();
}

bool _asBool(Object? value) =>
    value == true || value == 1 || value == '1' || value == 'true';