Rework storage structs, link preview

CHDataManagement/Model/LocalizedPost.swift

@@ -22,13 +22,7 @@ final class LocalizedPost: ObservableObject {
     var pageLinkText: String?
 
     @Published
-    var linkPreviewImage: FileResource?
-
-    @Published
-    var linkPreviewTitle: String?
-
-    @Published
-    var linkPreviewDescription: String?
+    var linkPreview: LinkPreview
 
     init(content: Content,
          title: String? = nil,
@@ -36,41 +30,14 @@ final class LocalizedPost: ObservableObject {
          lastModified: Date? = nil,
          images: [FileResource] = [],
          pageLinkText: String? = nil,
-         linkPreviewImage: FileResource? = nil,
-         linkPreviewTitle: String? = nil,
-         linkPreviewDescription: String? = nil) {
+         linkPreview: LinkPreview = .init()) {
         self.content = content
         self.title = title
         self.text = text
         self.lastModified = lastModified
         self.images = images
         self.pageLinkText = pageLinkText
-        self.linkPreviewImage = linkPreviewImage
-        self.linkPreviewTitle = linkPreviewTitle
-        self.linkPreviewDescription = linkPreviewDescription
-    }
-
-    init(content: Content, file: LocalizedPostFile, images: [String : FileResource]) {
-        self.content = content
-        self.title = file.title
-        self.text = file.content
-        self.lastModified = file.lastModifiedDate
-        self.images = file.images.compactMap { images[$0] }
-        self.pageLinkText = file.pageLinkText
-        self.linkPreviewImage = file.linkPreviewImage.map { images[$0] }
-        self.linkPreviewTitle = file.linkPreviewTitle
-        self.linkPreviewDescription = file.linkPreviewDescription
-    }
-
-    var postFile: LocalizedPostFile {
-        .init(images: images.map { $0.id },
-              title: title,
-              content: text,
-              lastModifiedDate: lastModified,
-              pageLinkText: pageLinkText,
-              linkPreviewImage: linkPreviewImage?.id,
-              linkPreviewTitle: linkPreviewTitle,
-              linkPreviewDescription: linkPreviewDescription)
+        self.linkPreview = linkPreview
     }
 
     func contains(_ string: String) -> Bool {
@@ -84,10 +51,41 @@ final class LocalizedPost: ObservableObject {
         if images.contains(file) {
             images.remove(file)
         }
-        remove(linkPreviewImage: file)
+        linkPreview.remove(file)
     }
 }
 
-extension LocalizedPost: LinkPreviewItem {
+// MARK: Storage
 
+extension LocalizedPost {
+
+    convenience init(context: LoadingContext, data: Data) {
+        self.init(
+            content: context.content,
+            title: data.title,
+            text: data.text,
+            lastModified: data.lastModifiedDate,
+            images: data.images.compactMap(context.image),
+            pageLinkText: data.pageLinkText,
+            linkPreview: .init(context: context, data: data.linkPreview))
+    }
+
+    var data: Data {
+        .init(images: images.map { $0.id },
+              title: title,
+              text: text,
+              lastModifiedDate: lastModified,
+              pageLinkText: pageLinkText,
+              linkPreview: linkPreview.data)
+    }
+
+    /// The structure to store the metadata of a localized post
+    struct Data: Codable {
+        let images: [String]
+        let title: String?
+        let text: String
+        let lastModifiedDate: Date?
+        let pageLinkText: String?
+        let linkPreview: LinkPreview.Data
+    }
 }