restaurant_page.dart

/*
 *  Copyright 2022 Google LLC
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import 'dart:math';

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

import 'data/restaurant_provider.dart';
import 'model/restaurant.dart';
import 'model/review.dart';
import 'widgets/dialogs/review_create.dart';
import 'widgets/restaurant_page_details.dart';
import 'widgets/restaurant_page_review_list.dart';

class RestaurantPage extends StatefulWidget {
  static const route = '/restaurant';

  final Restaurant restaurant;

  const RestaurantPage({super.key, required this.restaurant});

  @override
  State<RestaurantPage> createState() => _RestaurantPageState();
}

class _RestaurantPageState extends State<RestaurantPage> {
  _RestaurantPageState() {
    _initAsyncData();
  }

  void _initAsyncData() async {
    // widget is null or something
    final reviews = await _firestoreRestaurantProvider
        .getReviewsForRestaurant("wARqBbQnTHaxV8Tig7FM");

    setState(() {
      _isLoading = false;
      _user = FirebaseAuth.instance.currentUser!;
      _reviews = reviews;
    });
  }

  late final User _user;
  late List<Review> _reviews;
  bool _isLoading = true;
  final FirestoreRestaurantProvider _firestoreRestaurantProvider =
      FirestoreRestaurantProvider();

  void _onCreateReviewPressed(BuildContext context) async {
    final newReview = await showDialog<Review>(
      context: context,
      builder: (BuildContext context) => ReviewCreateDialog(
        userId: _user.uid,
        userName: _user.displayName ?? 'Anonymous User',
      ),
    );
    if (newReview != null) {
      // Save the review
      await _firestoreRestaurantProvider.addReview(
        restaurantId: widget.restaurant.id!,
        review: newReview,
      );
    }

    _updateReviews();
  }

  void _onAddRandomReviewsPressed() async {
    // Await adding a random number of random reviews
    final numReviews = Random().nextInt(5) + 5;
    for (var i = 0; i < numReviews; i++) {
      await _firestoreRestaurantProvider.addReview(
        restaurantId: widget.restaurant.id!,
        review: Review.random(
          userId: _user.uid,
          userName: _user.displayName ?? 'Anonymous User',
        ),
      );
    }

    _updateReviews();
  }

  void _updateReviews() async {
    final reviews = await _firestoreRestaurantProvider
        .getReviewsForRestaurant(widget.restaurant.id!);
    setState(() {
      _reviews = reviews;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.restaurant.name),
      ),
      floatingActionButton: _isLoading
          ? null
          : FloatingActionButton(
              tooltip: 'Tap to add a review',
              onPressed: () => _onCreateReviewPressed(context),
              child: const Icon(Icons.add),
            ),
      body: Center(
        child: Container(
          color: Colors.white,
          constraints: const BoxConstraints(maxWidth: 900),
          alignment: Alignment.center,
          child: Column(
            children: [
              RestaurantDetails(restaurant: widget.restaurant),
              const Divider(thickness: 1),
              _isLoading
                  ? const Center(child: LinearProgressIndicator())
                  : RestaurantPageReviewList(reviews: _reviews),
              if (!_isLoading && _reviews.isEmpty)
                Padding(
                  padding: const EdgeInsets.only(top: 24.0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceAround,
                    children: [
                      const Text(
                        'There are no reviews yet! Generate random reviews with button.',
                      ),
                      ElevatedButton(
                        onPressed: _onAddRandomReviewsPressed,
                        child: const Text('Add Random Reviews'),
                      )
                    ],
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}

class RestaurantPageArguments {
  final Restaurant restaurant;

  RestaurantPageArguments(this.restaurant);
}