feature: add bookmarking functionality

lib/main.dart

@@ -43,10 +43,30 @@ class HomePage extends StatelessWidget {
               child: const Icon(Icons.delete))
         ],
       ),
-      body: MovieManagerList(manager),
-      floatingActionButton: FloatingActionButton(
-        child: const Icon(Icons.refresh),
-        onPressed: () => manager.loadUpcomingMovies(),
+      body: DefaultTabController(
+        length: 2,
+        child: Column(
+          children: [
+            Expanded(
+              child: TabBarView(
+                children: [
+                  Scaffold(
+                    body: MovieManagerList(manager),
+                    floatingActionButton: FloatingActionButton(
+                      child: const Icon(Icons.refresh),
+                      onPressed: () => manager.loadUpcomingMovies(),
+                    ),
+                  ),
+                  MovieManagerList(manager, filter: (movie) => movie.bookmarked)
+                ],
+              ),
+            ),
+            const TabBar(tabs: [
+              Tab(icon: Icon(Icons.list), child: Text("Upcoming")),
+              Tab(icon: Icon(Icons.bookmark), child: Text("Bookmarked")),
+            ]),
+          ],
+        ),
       ),
     );
   }

lib/model/movie.dart

@@ -4,6 +4,7 @@ import 'package:intl/intl.dart';
 class MovieData extends ChangeNotifier {
   String _title;
   DateWithPrecisionAndCountry _releaseDate;
+  bool _bookmarked = false;
 
   bool _hasDetails = false;
   List<DateWithPrecisionAndCountry>? _releaseDates;
@@ -21,6 +22,10 @@ class MovieData extends ChangeNotifier {
     return _releaseDate;
   }
 
+  bool get bookmarked {
+    return _bookmarked;
+  }
+
   List<DateWithPrecisionAndCountry>? get releaseDates {
     return _releaseDates;
   }
@@ -41,7 +46,9 @@ class MovieData extends ChangeNotifier {
     return _hasDetails;
   }
 
-  void updateWithNew(MovieData movie) {
+  /// Updates the information with that of a new version of the movie
+  /// but ignores fields that are user controlled, like whether the movie was bookmarked.
+  void updateWithNewIgnoringUserControlled(MovieData movie) {
     setDetails(
         title: movie.title,
         releaseDate: movie.releaseDate,
@@ -54,6 +61,7 @@ class MovieData extends ChangeNotifier {
   void setDetails(
       {String? title,
       DateWithPrecisionAndCountry? releaseDate,
+      bool? bookmarked,
       List<DateWithPrecisionAndCountry>? releaseDates,
       List<String>? genres,
       List<TitleInLanguage>? titles,
@@ -64,6 +72,9 @@ class MovieData extends ChangeNotifier {
     if (releaseDate != null) {
       _releaseDate = releaseDate;
     }
+    if (bookmarked != null) {
+      _bookmarked = bookmarked;
+    }
     if (releaseDates != null) {
       _releaseDates = releaseDates;
     }
@@ -85,6 +96,10 @@ class MovieData extends ChangeNotifier {
     return "$title (${_releaseDate.toString()}${_genres?.isNotEmpty ?? true ? "; ${_genres?.join(", ")}" : ""})";
   }
 
+  bool same(MovieData other) {
+    return title == other.title && releaseDate.date == other.releaseDate.date;
+  }
+
   Map toJsonEncodable() {
     List? releaseDatesByCountry =
         _releaseDates?.map((e) => e.toJsonEncodable()).toList();
@@ -92,6 +107,7 @@ class MovieData extends ChangeNotifier {
     return {
       "title": title,
       "releaseDate": _releaseDate.toJsonEncodable(),
+      "bookmarked": _bookmarked,
       "releaseDates": releaseDatesByCountry,
       "genres": genres,
       "titles": titlesByCountry,
@@ -99,15 +115,12 @@ class MovieData extends ChangeNotifier {
     };
   }
 
-  bool same(MovieData other) {
-    return title == other.title && releaseDate.date == other.releaseDate.date;
-  }
-
   MovieData.fromJsonEncodable(Map json)
       : _title = json["title"],
         _releaseDate =
             DateWithPrecisionAndCountry.fromJsonEncodable(json["releaseDate"]) {
     setDetails(
+        bookmarked: json["bookmarked"] as bool,
         genres: (json["genres"] as List<dynamic>?)
             ?.map((genre) => genre as String)
             .toList(),

lib/model/movie_manager.dart

@@ -54,7 +54,7 @@ class MovieManager extends ChangeNotifier {
         added = true;
         actualMovies.add(movie);
       } else {
-        existing.updateWithNew(movie);
+        existing.updateWithNewIgnoringUserControlled(movie);
         actualMovies.add(existing);
       }
     }

lib/view/movie_item.dart

@@ -12,9 +12,16 @@ class MovieItem extends StatelessWidget {
       animation: movie,
       builder: (context, widget) {
         return ListTile(
-            title: Text(movie.title),
-            subtitle: Text(
-                "${dateRelativeToNow(movie.releaseDate.date)}, ${movie.releaseDate.toString()}, ${movie.genres?.join(", ") ?? ""}"));
+          title: Text(movie.title),
+          subtitle: Text(
+              "${dateRelativeToNow(movie.releaseDate.date)}, ${movie.releaseDate.toString()}, ${movie.genres?.join(", ") ?? ""}"),
+          trailing: TextButton(
+            child: Icon(movie.bookmarked
+                ? Icons.bookmark_added
+                : Icons.bookmark_border),
+            onPressed: () => movie.setDetails(bookmarked: !movie.bookmarked),
+          ),
+        );
       },
     );
   }

lib/view/movie_list.dart

@@ -4,10 +4,28 @@ import 'package:release_schedule/view/movie_item.dart';
 
 class MovieList extends StatelessWidget {
   final List<MovieData> movies;
-  const MovieList(this.movies, {super.key});
+  final bool Function(MovieData)? filter;
+  const MovieList(this.movies, {this.filter, super.key});
 
   @override
   Widget build(Object context) {
+    final localFilter = filter;
+    if (localFilter != null) {
+      List<int> indexMap = [];
+      int index = 0;
+      for (var movie in movies) {
+        if (localFilter(movie)) {
+          indexMap.add(index);
+        }
+        index++;
+      }
+      return ListView.builder(
+        itemCount: indexMap.length,
+        itemBuilder: (context, index) {
+          return MovieItem(movies[indexMap[index]]);
+        },
+      );
+    }
     return ListView.builder(
       itemCount: movies.length,
       itemBuilder: (context, index) {

lib/view/movie_manager_list.dart

@@ -1,10 +1,12 @@
 import 'package:flutter/material.dart';
+import 'package:release_schedule/model/movie.dart';
 import 'package:release_schedule/model/movie_manager.dart';
 import 'package:release_schedule/view/movie_list.dart';
 
 class MovieManagerList extends StatelessWidget {
   final MovieManager manager;
-  const MovieManagerList(this.manager, {super.key});
+  final bool Function(MovieData)? filter;
+  const MovieManagerList(this.manager, {this.filter, super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -14,7 +16,7 @@ class MovieManagerList extends StatelessWidget {
         return Column(
           children: [
             manager.loading ? const LinearProgressIndicator() : Container(),
-            Expanded(child: MovieList(manager.movies))
+            Expanded(child: MovieList(manager.movies, filter: filter))
           ],
         );
       },

test/model/movie_test.dart

@@ -23,7 +23,7 @@ void main() {
       ], reviews: [
         Review('8.5', 'John Doe', DateTime(2023, 1, 1), 100)
       ]);
-      movie1.updateWithNew(movie2);
+      movie1.updateWithNewIgnoringUserControlled(movie2);
       expect(movie1.title, equals('Title 2'));
       expect(movie1.releaseDate.country, equals('UK'));
       expect(movie1.releaseDates!.length, equals(1));