minor

lib/model/filters/album.dart

@@ -20,11 +20,12 @@ class AlbumFilter extends CoveredCollectionFilter {
 
   const AlbumFilter(this.album, this.displayName);
 
-  AlbumFilter.fromMap(Map<String, dynamic> json)
+  factory AlbumFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return AlbumFilter(
       json['album'],
       json['uniqueName'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/coordinate.dart

@@ -23,11 +23,12 @@ class CoordinateFilter extends CollectionFilter {
 
   const CoordinateFilter(this.sw, this.ne, {this.minuteSecondPadding = false});
 
-  CoordinateFilter.fromMap(Map<String, dynamic> json)
+  factory CoordinateFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return CoordinateFilter(
       LatLng.fromJson(json['sw']),
       LatLng.fromJson(json['ne']),
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/date.dart

@@ -0,0 +1,91 @@
+import 'package:aves/model/device.dart';
+import 'package:aves/model/filters/filters.dart';
+import 'package:aves/theme/icons.dart';
+import 'package:aves/widgets/common/extensions/build_context.dart';
+import 'package:collection/collection.dart';
+import 'package:flutter/widgets.dart';
+
+class LocationFilter extends CoveredCollectionFilter {
+  static const type = 'location';
+  static const locationSeparator = ';';
+
+  final LocationLevel level;
+  late final String _location;
+  late final String? _countryCode;
+  late final EntryFilter _test;
+
+  @override
+  List<Object?> get props => [level, _location, _countryCode];
+
+  LocationFilter(this.level, String location) {
+    final split = location.split(locationSeparator);
+    _location = split.isNotEmpty ? split[0] : location;
+    _countryCode = split.length > 1 ? split[1] : null;
+
+    if (_location.isEmpty) {
+      _test = (entry) => !entry.hasGps;
+    } else if (level == LocationLevel.country) {
+      _test = (entry) => entry.addressDetails?.countryCode == _countryCode;
+    } else if (level == LocationLevel.place) {
+      _test = (entry) => entry.addressDetails?.place == _location;
+    }
+  }
+
+  LocationFilter.fromMap(Map<String, dynamic> json)
+      : this(
+          LocationLevel.values.firstWhereOrNull((v) => v.toString() == json['level']) ?? LocationLevel.place,
+          json['location'],
+        );
+
+  @override
+  Map<String, dynamic> toMap() => {
+        'type': type,
+        'level': level.toString(),
+        'location': _countryCode != null ? countryNameAndCode : _location,
+      };
+
+  String get countryNameAndCode => '$_location$locationSeparator$_countryCode';
+
+  String? get countryCode => _countryCode;
+
+  @override
+  EntryFilter get test => _test;
+
+  @override
+  String get universalLabel => _location;
+
+  @override
+  String getLabel(BuildContext context) => _location.isEmpty ? context.l10n.filterLocationEmptyLabel : _location;
+
+  @override
+  Widget iconBuilder(BuildContext context, double size, {bool showGenericIcon = true}) {
+    if (_countryCode != null && device.canRenderFlagEmojis) {
+      final flag = countryCodeToFlag(_countryCode);
+      if (flag != null) {
+        return Text(
+          flag,
+          style: TextStyle(fontSize: size),
+          textScaleFactor: 1.0,
+        );
+      }
+    }
+    return Icon(_location.isEmpty ? AIcons.locationUnlocated : AIcons.location, size: size);
+  }
+
+  @override
+  String get category => type;
+
+  @override
+  String get key => '$type-$level-$_location';
+
+  // U+0041 Latin Capital letter A
+  // U+1F1E6 🇦 REGIONAL INDICATOR SYMBOL LETTER A
+  static const _countryCodeToFlagDiff = 0x1F1E6 - 0x0041;
+
+  static String? countryCodeToFlag(String? code) {
+    if (code == null || code.length != 2) return null;
+    return String.fromCharCodes(code.toUpperCase().codeUnits.map((letter) => letter += _countryCodeToFlagDiff));
+  }
+}
+
+enum LocationLevel { place, country }

lib/model/filters/location.dart

@@ -31,11 +31,12 @@ class LocationFilter extends CoveredCollectionFilter {
     }
   }
 
-  LocationFilter.fromMap(Map<String, dynamic> json)
+  factory LocationFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return LocationFilter(
       LocationLevel.values.firstWhereOrNull((v) => v.toString() == json['level']) ?? LocationLevel.place,
       json['location'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/mime.dart

@@ -43,10 +43,11 @@ class MimeFilter extends CollectionFilter {
     _icon = icon ?? AIcons.vector;
   }
 
-  MimeFilter.fromMap(Map<String, dynamic> json)
+  factory MimeFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return MimeFilter(
       json['mime'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/path.dart

@@ -15,10 +15,11 @@ class PathFilter extends CollectionFilter {
 
   PathFilter(this.path) : _rootAlbum = path.substring(0, path.length - 1);
 
-  PathFilter.fromMap(Map<String, dynamic> json)
+  factory PathFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return PathFilter(
       json['path'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/query.dart

@@ -59,10 +59,11 @@ class QueryFilter extends CollectionFilter {
     _test = not ? (entry) => !testTitle(entry) : testTitle;
   }
 
-  QueryFilter.fromMap(Map<String, dynamic> json)
+  factory QueryFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return QueryFilter(
       json['query'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/rating.dart

@@ -13,10 +13,11 @@ class RatingFilter extends CollectionFilter {
 
   const RatingFilter(this.rating);
 
-  RatingFilter.fromMap(Map<String, dynamic> json)
+  factory RatingFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return RatingFilter(
       json['rating'] ?? 0,
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/tag.dart

@@ -20,11 +20,12 @@ class TagFilter extends CoveredCollectionFilter {
     }
   }
 
-  TagFilter.fromMap(Map<String, dynamic> json)
+  factory TagFilter.fromMap(Map<String, dynamic> json) {
-      : this(
+    return TagFilter(
       json['tag'],
       not: json['not'] ?? false,
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/type.dart

@@ -59,10 +59,11 @@ class TypeFilter extends CollectionFilter {
     }
   }
 
-  TypeFilter.fromMap(Map<String, dynamic> json)
+  factory TypeFilter.fromMap(Map<String, dynamic> json) {
-      : this._private(
+    return TypeFilter._private(
       json['itemType'],
     );
+  }
 
   @override
   Map<String, dynamic> toMap() => {