import 'package:flutter/material.dart';

/// Abstract main application route
///
/// This mixin contains methods available in all display modes
///
/// @author Pierre Hubert

/// Main controller key statically shared across application
///
/// Do not use it directly to avoid context leak, instead use the access method
/// [MainController.of]
final mainControllerKey = GlobalKey<MainController>();

mixin MainRoute implements StatefulWidget {}

/// Public interface of home controller
abstract class MainController extends State<MainRoute> {
  /// Get current instance of Home controller
  static MainController of(BuildContext context) {
    assert(context != null); // A future implementation might need context again
    return mainControllerKey.currentState;
  }

  /// Pop until main route is reached
  void popUntilMainRoute() => Navigator.of(context).popUntil((settings) =>
      ModalRoute.of(context).isCurrent || !ModalRoute.of(context).isActive);

  /// Open user page
  void openUserPage(int userID);

  void openUserAccessDeniedPage(int userID);

  /// Open a specific group page specified by its [groupID]
  void openGroup(int groupID);

  /// Display the list of friends of a user
  void openUserFriendsList(int userID);

  /// Pop current page. Last page can not be popped
  ///
  /// If the current route is not the main route, we pop one page
  void popPage() {
    if (!ModalRoute.of(context).isCurrent)
      Navigator.of(context).pop();
    else
      doPopPage();
  }

  /// Pop current page. Do not call this method directly.
  @protected
  void doPopPage();

  /// Push a new widget
  void push(Widget w, {bool hideNavBar, bool allowAsDialog});

  /// Open a conversation
  void openConversation(int convID, {fullScreen: false});

  /// Start a call for a given conversation
  void startCall(int convID);
}