// 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 'package:path_to_regexp/path_to_regexp.dart';

import 'parsed_route.dart';

/// Used by [TemplateRouteParser] to guard access to routes.
typedef RouteGuard<T> = Future<T> Function(T from);

/// Parses the URI path into a [ParsedRoute].
class TemplateRouteParser extends RouteInformationParser<ParsedRoute> {
  final List<String> _pathTemplates;
  final ParsedRoute initialRoute;

  TemplateRouteParser({
    /// The list of allowed path templates (['/', '/users/:id'])
    required List<String> allowedPaths,

    /// The initial route
    String initialRoute = '/',

  })  : initialRoute = ParsedRoute(initialRoute, initialRoute, {}, {}),
        _pathTemplates = [
          ...allowedPaths,
        ],
        assert(allowedPaths.contains(initialRoute));

  @override
  Future<ParsedRoute> parseRouteInformation(
    RouteInformation routeInformation,
  ) async {
    print("=======parseRouteInformation:${routeInformation.uri.path}===================");

    final uri = routeInformation.uri;
    final path = uri.toString();
    final queryParams = uri.queryParameters;
    var parsedRoute = initialRoute;

    for (var pathTemplate in _pathTemplates) {
      final parameters = <String>[];
      var pathRegExp = pathToRegExp(pathTemplate, parameters: parameters);
      if (pathRegExp.hasMatch(path)) {
        final match = pathRegExp.matchAsPrefix(path);
        if (match == null) continue;
        final params = extract(parameters, match);
        parsedRoute = ParsedRoute(path, pathTemplate, params, queryParams);
      }
    }

    return parsedRoute;
  }

  @override
  RouteInformation restoreRouteInformation(ParsedRoute configuration) {
    print("=======restoreRouteInformation:${configuration}===================");

    return RouteInformation(uri: Uri.parse(configuration.path));
  }
}