Rework storage structs, link preview

CHDataManagement/Model/LocalizedTag.swift

@@ -12,14 +12,7 @@ final class LocalizedTag: ObservableObject {
     var name: String
 
     @Published
-    var linkPreviewTitle: String?
-
-    @Published
-    var linkPreviewDescription: String?
-
-    /// The image id of the thumbnail
-    @Published
-    var linkPreviewImage: FileResource?
+    var linkPreview: LinkPreview
 
     /// The original url in the previous site layout
     let originalUrl: String?
@@ -27,42 +20,51 @@ final class LocalizedTag: ObservableObject {
     init(content: Content,
          urlComponent: String,
          name: String,
-         linkPreviewTitle: String? = nil,
-         linkPreviewDescription: String? = nil,
-         linkPreviewImage: FileResource? = nil,
+         linkPreview: LinkPreview = .init(),
          originalUrl: String? = nil) {
         self.content = content
         self.urlComponent = urlComponent
         self.name = name
-        self.linkPreviewTitle = linkPreviewTitle
-        self.linkPreviewDescription = linkPreviewDescription
-        self.linkPreviewImage = linkPreviewImage
+        self.linkPreview = linkPreview
         self.originalUrl = originalUrl
     }
 
     func isValid(urlComponent: String) -> Bool {
+        !urlComponent.isEmpty &&
         content.isValidIdForTagOrPageOrPost(urlComponent) &&
         !content.containsTag(withUrlComponent: urlComponent)
     }
 
     /// The title to display when considering multiple items of this tag
     var title: String {
-        linkPreviewTitle ?? name
+        linkPreview.title ?? name
     }
 }
 
-extension LocalizedTag: LinkPreviewItem {
-
-}
+// MARK: Storage
 
 extension LocalizedTag {
 
-    var tagFile: LocalizedTagFile {
+    convenience init(context: LoadingContext, data: Data) {
+        self.init(
+            content: context.content,
+            urlComponent: data.urlComponent,
+            name: data.name,
+            linkPreview: .init(context: context, data: data.linkPreview),
+            originalUrl: data.originalUrl)
+    }
+
+    struct Data: Codable {
+        let urlComponent: String
+        let name: String
+        let linkPreview: LinkPreview.Data
+        let originalUrl: String?
+    }
+
+    var data: Data {
         .init(urlComponent: urlComponent,
               name: name,
-              linkPreviewTitle: linkPreviewTitle,
-              linkPreviewDescription: linkPreviewDescription,
-              linkPreviewImage: linkPreviewImage?.id,
-              originalURL: originalUrl)
+              linkPreview: linkPreview.data,
+              originalUrl: originalUrl)
     }
 }