// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/widgets.dart';

import 'parsed_route.dart';
import 'parser.dart';

/// The current route state. To change the current route, call obtain the state
/// using `RouteStateScope.of(context)` and call `go()`:
///
/// ```
/// RouteStateScope.of(context).go('/book/2');
/// ```
class RouteState extends ChangeNotifier {
  final AppRouteParser _parser;
  ParsedRoute _route;

  RouteState(this._parser,{String initial=''}) : _route = ParsedRoute(initial,{});

  ParsedRoute get route => _route;

  set route(ParsedRoute route) {
    // Don't notify listeners if the path hasn't changed.
    if (_route == route) return;

    _route = route;
    notifyListeners();
  }

  Future<void> go(String route) async {
    this.route = await _parser
        .parseRouteInformation(RouteInformation(uri: Uri.parse(route)));
  }
}

/// Provides the current [RouteState] to descendant widgets in the tree.
class RouteStateScope extends InheritedNotifier<RouteState> {
  const RouteStateScope({
    required super.notifier,
    required super.child,
    super.key,
  });

  static RouteState of(BuildContext context) =>
      context.dependOnInheritedWidgetOfExactType<RouteStateScope>()!.notifier!;
}