Cache fixes

Model/Cache/BaseCacheModel.swift

@@ -0,0 +1,36 @@
+import Cache
+import Foundation
+import Logging
+import SwiftyJSON
+
+struct BaseCacheModel {
+    static var shared = BaseCacheModel()
+
+    static let jsonToDataTransformer: (JSON) -> Data = { try! $0.rawData() }
+    static let jsonFromDataTransformer: (Data) -> JSON = { try! JSON(data: $0) }
+    static let jsonTransformer = Transformer(toData: jsonToDataTransformer, fromData: jsonFromDataTransformer)
+
+    var models: [CacheModel] {
+        [
+            FeedCacheModel.shared,
+            VideosCacheModel.shared,
+            PlaylistsCacheModel.shared,
+            ChannelPlaylistsCacheModel.shared,
+            SubscribedChannelsModel.shared
+        ]
+    }
+
+    func clear() {
+        models.forEach { $0.clear() }
+    }
+
+    var totalSize: Int {
+        models.compactMap { $0.storage?.totalDiskStorageSize }.reduce(0, +)
+    }
+
+    var totalSizeFormatted: String {
+        byteCountFormatter.string(fromByteCount: Int64(totalSize))
+    }
+
+    private var byteCountFormatter: ByteCountFormatter { .init() }
+}