import 'package:comunic/helpers/account_helper.dart';
import 'package:comunic/ui/routes/app_settings_route.dart';
import 'package:comunic/ui/screens/conversations_list_screen.dart';
import 'package:comunic/ui/screens/friends_list_screen.dart';
import 'package:comunic/ui/screens/groups_list_screen.dart';
import 'package:comunic/ui/screens/newest_posts.dart';
import 'package:comunic/ui/screens/notifications_screen.dart';
import 'package:comunic/ui/widgets/navbar_widget.dart';
import 'package:comunic/utils/account_utils.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:comunic/utils/navigation_utils.dart';
import 'package:comunic/utils/ui_utils.dart';
import 'package:flutter/material.dart';

import 'login_route.dart';

/// Main route of the application
///
/// @author Pierre HUBERT

class HomeRoute extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _HomeRouteState();
}

class CurrPage {
  final BarCallbackActions action;
  final Map<String, dynamic> args;

  const CurrPage(this.action, {this.args}) : assert(action != null);
}

class _HomeRouteState extends State<HomeRoute> {
  CurrPage get _currTab => history.last;
  List<CurrPage> history = List();

  /// Change currently visible tab
  void _pushPage(CurrPage newPage) {
    setState(() {
      history.add(newPage);
    });
  }

  /// Pop the page
  void _popPage() {
    history.removeLast();
    setState(() {});
  }

  /// Allows to go to previous tab
  Future<bool> _willPop() async {
    if (history.length == 1) return true;

    _popPage();
    return false;
  }

  /// Handles a new tab being tapped
  void _onTap(BarCallbackActions action) {
    /// Check more quick actions
    switch (action) {

      /// Open current user page
      case BarCallbackActions.OPEN_MY_PAGE:
        _openCurrentUserPage();
        break;

      /// Open app settings page
      case BarCallbackActions.OPEN_APP_SETTINGS:
        _openAppSettings();
        break;

      /// Logout user
      case BarCallbackActions.ACTION_LOGOUT:
        _logoutRequested();
        break;

      default:
        _pushPage(CurrPage(action));
    }
  }

  @override
  void initState() {
    super.initState();

    // Default page: conversations list
    _pushPage(CurrPage(BarCallbackActions.OPEN_CONVERSATIONS));
  }

  /// Build the body of the application
  Widget _buildBody(BuildContext context) {
    switch (_currTab.action) {
      case BarCallbackActions.OPEN_NOTIFICATIONS:
        return NotificationsScreen();

      case BarCallbackActions.OPEN_CONVERSATIONS:
        return ConversationsListScreen();

      case BarCallbackActions.OPEN_NEWEST_POSTS:
        return NewestPostsScreen();

      case BarCallbackActions.OPEN_FRIENDS:
        return FriendsListScreen();

      case BarCallbackActions.OPEN_GROUPS:
        return GroupsListScreen();

      default:
        throw "Invalid tab : " + _currTab.toString();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.blueAccent,
      child: SafeArea(
        // Avoid OS areas
        child: WillPopScope(
          onWillPop: _willPop,
          child: Scaffold(
            appBar: ComunicAppBar(
              onTap: _onTap,
              selectedAction: _currTab.action,
            ),
            body: SafeArea(
              child: _buildBody(context),
            ),
          ),
        ),
      ),
    );
  }

  /// Open current user page
  Future<void> _openCurrentUserPage() async {
    openUserPage(context: context, userID: userID());
  }

  void _openAppSettings() {
    Navigator.of(context)
        .push(MaterialPageRoute(builder: (c) => AppSettingsRoute()));
  }

  /// Handle logout requests from user
  Future<void> _logoutRequested() async {
    if (!await showConfirmDialog(
        context: context,
        message: tr("Do you really want to sign out from the application ?"),
        title: tr("Sign out"))) return;

    await AccountHelper().signOut();

    Navigator.pushReplacement(context, MaterialPageRoute(builder: (c) {
      return LoginRoute();
    }));
  }
}