Use mixin for helper class

app/lib/ui/flow/home/home_view_model_helper_mixin.dart

@@ -0,0 +1,71 @@
+import 'package:cloud_gallery/domain/formatter/date_formatter.dart';
+import 'package:collection/collection.dart';
+import 'package:data/models/media/media.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final homeViewModelHelperProvider = Provider<HomeViewModelHelper>((ref) {
+  return const HomeViewModelHelper();
+});
+
+class HomeViewModelHelper {
+
+  List<AppMedia> mergeCommonMedia({
+    required List<AppMedia> localMedias,
+    required List<AppMedia> googleDriveMedias,
+  }) {
+    // If one of the lists is empty, return the other list.
+    if (googleDriveMedias.isEmpty) return localMedias;
+    if (localMedias.isEmpty) return [];
+
+    // Convert the lists to mutable lists.
+    localMedias = localMedias.toList();
+    googleDriveMedias = googleDriveMedias.toList();
+
+    final mergedMedias = <AppMedia>[];
+
+    // Add common media to mergedMedias and remove them from the lists.
+    for (AppMedia localMedia in localMedias.toList()) {
+      googleDriveMedias
+          .toList()
+          .where((googleDriveMedia) => googleDriveMedia.path == localMedia.path)
+          .forEach((googleDriveMedia) {
+        localMedias.removeWhere((media) => media.id == localMedia.id);
+
+        mergedMedias.add(localMedia.copyWith(
+          sources: [AppMediaSource.local, AppMediaSource.googleDrive],
+          thumbnailLink: googleDriveMedia.thumbnailLink,
+          driveRefId: googleDriveMedia.id,
+        ));
+      });
+    }
+
+    return [...mergedMedias, ...localMedias];
+  }
+
+  Map<DateTime, List<AppMedia>> sortMedias({required List<AppMedia> medias}) {
+    medias.sort((a, b) => (b.createdTime ?? DateTime.now())
+        .compareTo(a.createdTime ?? DateTime.now()));
+    return groupBy<AppMedia, DateTime>(
+      medias,
+      (AppMedia media) =>
+          media.createdTime?.dateOnly ?? DateTime.now().dateOnly,
+    );
+  }
+
+  List<AppMedia> removeGoogleDriveRefFromMedias(
+      Map<DateTime, List<AppMedia>> medias) {
+    final allMedias = medias.values.expand((element) => element).toList();
+    for (int index = 0; index < allMedias.length; index++) {
+      if (allMedias[index].sources.length > 1) {
+        allMedias[index] = allMedias[index].copyWith(
+          sources: allMedias[index].sources.toList()
+            ..remove(AppMediaSource.googleDrive),
+          thumbnailLink: null,
+        );
+      } else if (allMedias.contains(AppMediaSource.googleDrive)) {
+        allMedias.removeAt(index);
+      }
+    }
+    return allMedias;
+  }
+}

data/lib/models/media/media.dart

@@ -98,6 +98,7 @@ enum AppMediaSource {
 class AppMedia with _$AppMedia {
   const factory AppMedia({
     required String id,
+    String? driveMediaRefId,
     String? name,
     required String path,
     String? thumbnailLink,
@@ -204,4 +205,12 @@ extension AppMediaExtension on AppMedia {
       quality: 70,
     );
   }
+
+  bool get isGoogleDriveStored =>
+      sources.contains(AppMediaSource.googleDrive) && sources.length == 1;
+
+  bool get isLocalStored =>
+      sources.contains(AppMediaSource.local) && sources.length == 1;
+
+  bool get isCommonStored => sources.length > 1;
 }

data/lib/models/media/media.freezed.dart

@@ -21,6 +21,7 @@ AppMedia _$AppMediaFromJson(Map<String, dynamic> json) {
 /// @nodoc
 mixin _$AppMedia {
   String get id => throw _privateConstructorUsedError;
+  String? get driveMediaRefId => throw _privateConstructorUsedError;
   String? get name => throw _privateConstructorUsedError;
   String get path => throw _privateConstructorUsedError;
   String? get thumbnailLink => throw _privateConstructorUsedError;
@@ -50,6 +51,7 @@ abstract class $AppMediaCopyWith<$Res> {
   @useResult
   $Res call(
       {String id,
+      String? driveMediaRefId,
       String? name,
       String path,
       String? thumbnailLink,
@@ -81,6 +83,7 @@ class _$AppMediaCopyWithImpl<$Res, $Val extends AppMedia>
   @override
   $Res call({
     Object? id = null,
+    Object? driveMediaRefId = freezed,
     Object? name = freezed,
     Object? path = null,
     Object? thumbnailLink = freezed,
@@ -102,6 +105,10 @@ class _$AppMediaCopyWithImpl<$Res, $Val extends AppMedia>
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
               as String,
+      driveMediaRefId: freezed == driveMediaRefId
+          ? _value.driveMediaRefId
+          : driveMediaRefId // ignore: cast_nullable_to_non_nullable
+              as String?,
       name: freezed == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
@@ -176,6 +183,7 @@ abstract class _$$AppMediaImplCopyWith<$Res>
   @useResult
   $Res call(
       {String id,
+      String? driveMediaRefId,
       String? name,
       String path,
       String? thumbnailLink,
@@ -205,6 +213,7 @@ class __$$AppMediaImplCopyWithImpl<$Res>
   @override
   $Res call({
     Object? id = null,
+    Object? driveMediaRefId = freezed,
     Object? name = freezed,
     Object? path = null,
     Object? thumbnailLink = freezed,
@@ -226,6 +235,10 @@ class __$$AppMediaImplCopyWithImpl<$Res>
           ? _value.id
           : id // ignore: cast_nullable_to_non_nullable
               as String,
+      driveMediaRefId: freezed == driveMediaRefId
+          ? _value.driveMediaRefId
+          : driveMediaRefId // ignore: cast_nullable_to_non_nullable
+              as String?,
       name: freezed == name
           ? _value.name
           : name // ignore: cast_nullable_to_non_nullable
@@ -295,6 +308,7 @@ class __$$AppMediaImplCopyWithImpl<$Res>
 class _$AppMediaImpl implements _AppMedia {
   const _$AppMediaImpl(
       {required this.id,
+      this.driveMediaRefId,
       this.name,
       required this.path,
       this.thumbnailLink,
@@ -318,6 +332,8 @@ class _$AppMediaImpl implements _AppMedia {
   @override
   final String id;
   @override
+  final String? driveMediaRefId;
+  @override
   final String? name;
   @override
   final String path;
@@ -356,7 +372,7 @@ class _$AppMediaImpl implements _AppMedia {
 
   @override
   String toString() {
-    return 'AppMedia(id: $id, name: $name, path: $path, thumbnailLink: $thumbnailLink, displayHeight: $displayHeight, displayWidth: $displayWidth, type: $type, mimeType: $mimeType, createdTime: $createdTime, modifiedTime: $modifiedTime, orientation: $orientation, size: $size, videoDuration: $videoDuration, latitude: $latitude, longitude: $longitude, sources: $sources)';
+    return 'AppMedia(id: $id, driveMediaRefId: $driveMediaRefId, name: $name, path: $path, thumbnailLink: $thumbnailLink, displayHeight: $displayHeight, displayWidth: $displayWidth, type: $type, mimeType: $mimeType, createdTime: $createdTime, modifiedTime: $modifiedTime, orientation: $orientation, size: $size, videoDuration: $videoDuration, latitude: $latitude, longitude: $longitude, sources: $sources)';
   }
 
   @override
@@ -365,6 +381,8 @@ class _$AppMediaImpl implements _AppMedia {
         (other.runtimeType == runtimeType &&
             other is _$AppMediaImpl &&
             (identical(other.id, id) || other.id == id) &&
+            (identical(other.driveMediaRefId, driveMediaRefId) ||
+                other.driveMediaRefId == driveMediaRefId) &&
             (identical(other.name, name) || other.name == name) &&
             (identical(other.path, path) || other.path == path) &&
             (identical(other.thumbnailLink, thumbnailLink) ||
@@ -397,6 +415,7 @@ class _$AppMediaImpl implements _AppMedia {
   int get hashCode => Object.hash(
       runtimeType,
       id,
+      driveMediaRefId,
       name,
       path,
       thumbnailLink,
@@ -430,6 +449,7 @@ class _$AppMediaImpl implements _AppMedia {
 abstract class _AppMedia implements AppMedia {
   const factory _AppMedia(
       {required final String id,
+      final String? driveMediaRefId,
       final String? name,
       required final String path,
       final String? thumbnailLink,
@@ -452,6 +472,8 @@ abstract class _AppMedia implements AppMedia {
   @override
   String get id;
   @override
+  String? get driveMediaRefId;
+  @override
   String? get name;
   @override
   String get path;

data/lib/services/google_drive_service.dart

@@ -73,6 +73,15 @@ class GoogleDriveService {
     }
   }
 
+  Future<void> deleteMedia(String id) async {
+    try {
+      final driveApi = await _getGoogleDriveAPI();
+      await driveApi.files.delete(id);
+    } catch (e) {
+      throw AppError.fromError(e);
+    }
+  }
+
   Future<void> uploadInGoogleDrive(
       {required String folderID, required AppMedia media}) async {
     final localFile = File(media.path);

data/lib/services/local_media_service.dart

@@ -45,4 +45,12 @@ class LocalMediaService {
       throw AppError.fromError(e);
     }
   }
+
+  Future<List<String>> deleteMedias(List<String> medias) async {
+    try {
+      return await PhotoManager.editor.deleteWithIds(medias);
+    } catch (e) {
+      throw AppError.fromError(e);
+    }
+  }
 }