Add feed filter options

lib/main.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:feet/widgets/centered_page_hint.dart';
+import 'package:feet/widgets/filter_menu.dart';
 import 'package:feet/widgets/homepage_post.dart';
 import 'package:feet/widgets/login_prompt.dart';
 import 'package:flutter/material.dart';
@@ -83,9 +84,15 @@ class _MyHomePageState extends State<MyHomePage> {
   var _fetched = false;
   var _fetchedCount = 0;
   var _knownPostsSize = -1;
+  List<int> _feedFilter = [];
 
   Future<void> refresh() async {
     widget.api.cache.clear();
+    setState(() {
+      _fetchedCount = 0;
+      _knownPostsSize = -1;
+      _feedFilter = [];
+    });
 
     print("Starting refresh");
 
@@ -97,10 +104,8 @@ class _MyHomePageState extends State<MyHomePage> {
         .sinceId(0)
         .execute();
 
-    while (
-      (data['items'] as List<dynamic>).isNotEmpty &&
-      _fetchedCount < FETCH_MAX_POSTS
-    ) {
+    while ((data['items'] as List<dynamic>).isNotEmpty &&
+        _fetchedCount < FETCH_MAX_POSTS) {
       print("Fetching more items");
 
       var ids = widget.api.cache.items
@@ -134,7 +139,10 @@ class _MyHomePageState extends State<MyHomePage> {
   @override
   Widget build(BuildContext context) {
     var loggedIn = widget.api.loggedIn();
-    var posts = widget.api.cache.items.getAll().values;
+    var posts = widget.api.cache.items.getAll().values.where(
+      (element) => _feedFilter.isEmpty || _feedFilter.contains(element.feedId)
+    );
+
     var savedPosts = posts.where((element) => element.isSaved);
     var unreadPosts = posts.where((element) => !element.isRead);
 
@@ -173,7 +181,8 @@ class _MyHomePageState extends State<MyHomePage> {
               text: "Nothing here yet. Try saving some posts!"),
     ];
 
-    // I'm aware that this is stupid, but I'm sick and tired and really don't care as long as it works
+    // I'm aware that this is stupid, but I'm sick and tired and
+    // really don't care as long as it works
     if (!loggedIn) {
       Timer.periodic(const Duration(seconds: 1), (timer) {
         setState(() {
@@ -248,7 +257,33 @@ class _MyHomePageState extends State<MyHomePage> {
                           ),
                         );
                       },
-                    )
+                    ),
+                    PopupMenuItem(
+                      value: "filter",
+                      child: Text(
+                        _feedFilter.isEmpty
+                          ? "Filter..."
+                          : "Filter (${_feedFilter.length}/${widget.api.cache.feeds.size})"
+                      ),
+                      onTap: () {
+                        Future.delayed(
+                          Duration.zero,
+                          () => showDialog(
+                            context: context,
+                            barrierDismissible: false,
+                            builder: (context) => FilterMenu(
+                              api: widget.api,
+                              initData: _feedFilter,
+                              onConfirm: (items) {
+                                setState(() {
+                                  _feedFilter = items;
+                                });
+                              },
+                            ),
+                          ),
+                        );
+                      },
+                    ),
                   ]),
         ],
       ),

lib/widgets/filter_menu.dart

@@ -0,0 +1,97 @@
+import 'package:feet/api/api.dart';
+import 'package:flutter/material.dart';
+
+class FilterMenu extends StatefulWidget {
+  final FeverAPI api;
+  final List<int> initData;
+  final void Function(List<int> items) onConfirm;
+  const FilterMenu({
+    super.key,
+    required this.api,
+    required this.initData,
+    required this.onConfirm,
+  });
+
+  @override
+  State<FilterMenu> createState() => _FilterMenuState();
+}
+
+class _FilterMenuState extends State<FilterMenu> {
+  final Map<int, bool> _checked = {};
+
+  @override
+  void initState() {
+    super.initState();
+    for (var feed in widget.api.cache.feeds.getAll().values) {
+      _checked[feed.id] = widget.initData.contains(feed.id);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    int selected = _checked.values.where((e) => e == true).length;
+
+    return SimpleDialog(
+      title: const Text("Filter"),
+      children: [
+        Container(
+          padding: const EdgeInsets.symmetric(horizontal: 24.0, vertical: 4.0),
+          child: Text(
+            selected == 0
+                ? "All feeds will be shown"
+                : "$selected out of ${_checked.length} feeds will be shown",
+          ),
+        ),
+        Container(
+          width: 300,
+          height: 280,
+          padding: const EdgeInsets.all(8.0),
+          child: ListView(
+            children: widget.api.cache.feeds
+                .getAll()
+                .values
+                .map((feed) => Row(
+                      children: [
+                        Checkbox(
+                          value: _checked[feed.id] ?? false,
+                          onChanged: (value) {
+                            setState(() {
+                              _checked[feed.id] = value ?? true;
+                            });
+                          },
+                        ),
+                        Text(feed.title),
+                      ],
+                    ))
+                .toList(),
+          ),
+        ),
+        Row(
+          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+          children: [
+            TextButton(
+              onPressed: () {
+                List<int> items = _checked.keys
+                    .where((element) => _checked[element]!)
+                    .toList();
+
+                widget.onConfirm(items);
+                Navigator.of(context).pop();
+              },
+              child: const Text("Done"),
+            ),
+            TextButton(
+                onPressed: () {
+                  setState(() {
+                    _checked.forEach((key, value) {
+                      _checked[key] = false;
+                    });
+                  });
+                },
+                child: const Text("Reset")),
+          ],
+        )
+      ],
+    );
+  }
+}