Generate video thumbnails

CHDataManagement/Model/FileResource.swift

@@ -136,15 +136,14 @@ final class FileResource: Item, LocalizedItem {
         }
     }
 
-    var imageToDisplay: Image {
-        guard let imageData = content.storage.fileData(for: id) else {
-            print("Failed to load data for image \(id)")
-            return failureImage
+    var imageToDisplay: Image? {
+        guard let displayImageData else {
+            return nil
         }
-        update(fileSize: imageData.count)
-        guard let loadedImage = NSImage(data: imageData) else {
+        update(fileSize: displayImageData.count)
+        guard let loadedImage = NSImage(data: displayImageData) else {
             print("Failed to create image \(id)")
-            return failureImage
+            return nil
         }
         update(imageDimensions: loadedImage.size)
 
@@ -167,14 +166,25 @@ final class FileResource: Item, LocalizedItem {
         return size
     }
 
+    private var displayImageData: Foundation.Data? {
+        if type.isImage {
+            guard let data = content.storage.fileData(for: id) else {
+                print("Failed to load data for image \(id)")
+                return nil
+            }
+            return data
+        }
+        if type.isVideo {
+            return content.storage.getVideoThumbnail(for: id)
+        }
+        return nil
+    }
+
     private func getCurrentImageDimensions() -> CGSize? {
-        guard type.isImage else {
+        guard let displayImageData else {
             return nil
         }
-        guard let imageData = content.storage.fileData(for: id) else {
-            return nil
-        }
-        guard let loadedImage = NSImage(data: imageData) else {
+        guard let loadedImage = NSImage(data: displayImageData) else {
             return nil
         }
         return loadedImage.size
@@ -214,10 +224,6 @@ final class FileResource: Item, LocalizedItem {
         self.generatedImageVersions = []
     }
 
-    private var failureImage: Image {
-        Image(systemSymbol: .exclamationmarkTriangle)
-    }
-
     /// The path to the output folder where image versions are stored (no leading slash)
     var outputImageFolder: String {
         "\(content.settings.paths.imagesOutputFolderPath)/\(id.fileNameWithoutExtension)"
@@ -260,6 +266,18 @@ final class FileResource: Item, LocalizedItem {
         return content.settings.general.url + version.outputPath
     }
 
+    // MARK: Video thumbnail
+
+    func createVideoThumbnail() {
+        guard type.isVideo else { return }
+        guard !content.storage.hasVideoThumbnail(for: id) else { return }
+        Task {
+            if await content.imageGenerator.createVideoThumbnail(for: id) {
+                didChange()
+            }
+        }
+    }
+
     // MARK: Paths
 
     func removeFileFromOutputFolder() {