Generate video thumbnails

CHDataManagement/Storage/Storage.swift

@@ -26,6 +26,8 @@ final class Storage: ObservableObject {
 
     private let tagsFolderName = "tags"
 
+    private let videoThumbnailFolderName = "thumbnails"
+
     private let outputPathFileName = "outputPath.bin"
 
     private let settingsDataFileName = "settings.json"
@@ -238,7 +240,10 @@ final class Storage: ObservableObject {
         guard contentScope.deleteFile(at: filePath(file: fileId)) else {
             return false
         }
-        return contentScope.deleteFile(at: fileInfoPath(file: fileId))
+        guard contentScope.deleteFile(at: fileInfoPath(file: fileId)) else {
+            return false
+        }
+        return contentScope.deleteFile(at: videoThumbnailPath(fileId))
     }
 
     /**
@@ -248,7 +253,11 @@ final class Storage: ObservableObject {
         guard let contentScope else {
             return false
         }
-        return contentScope.deleteFile(at: filePath(file: fileId))
+        guard contentScope.deleteFile(at: filePath(file: fileId)) else {
+            return false
+        }
+        // Delete video thumbnail, which may not exist (not generated / not a video)
+        return contentScope.deleteFile(at: videoThumbnailPath(fileId))
     }
 
     /**
@@ -366,6 +375,39 @@ final class Storage: ObservableObject {
         return contentScope.write(fileContent, to: path)
     }
 
+    func with<T>(file fileId: String, perform operation: (URL) async -> T?) async -> T? {
+        guard let contentScope else { return nil }
+        let path = filePath(file: fileId)
+        return await contentScope.with(relativePath: path, perform: operation)
+    }
+
+    // MARK: Video thumbnails
+
+    func hasVideoThumbnail(for videoId: String) -> Bool {
+        guard let contentScope else { return false }
+        let path = videoThumbnailPath(videoId)
+        return contentScope.hasFile(at: path)
+    }
+
+    private func videoThumbnailPath(_ videoId: String) -> String {
+        guard !videoId.hasSuffix("jpg") else {
+            return videoThumbnailFolderName + "/" + videoId
+        }
+        return videoThumbnailFolderName + "/" + videoId + ".jpg"
+    }
+
+    func save(thumbnail: Data, for videoId: String) -> Bool {
+        guard let contentScope else { return false }
+        let path = videoThumbnailPath(videoId)
+        return contentScope.write(thumbnail, to: path)
+    }
+
+    func getVideoThumbnail(for videoId: String) -> Data? {
+        guard let contentScope else { return nil }
+        let path = videoThumbnailPath(videoId)
+        return contentScope.readData(at: path)
+    }
+
     // MARK: Settings
 
     func loadSettings() -> Settings.Data? {