fix(re-download): office file

Signed-off-by: alperozturk96 <alper_ozturk@proton.me>

Author: alperozturk96

app/src/main/java/com/owncloud/android/utils/RichDocumentDownloadAsParser.kt

@@ -47,13 +47,18 @@ object RichDocumentDownloadAsParser {
         val format = obj[FORMAT]?.jsonPrimitive?.contentOrNull
         val name = obj[NAME]?.jsonPrimitive?.contentOrNull
         if (format == null || url == null) return null
-        return DownloadAs(format = format, filename = name ?: "", url = url)
+        return DownloadAs(format = format, filename = createFilename(name, format), url = url)
     }
 
     private fun tryParseV1(obj: JsonObject, url: String?): DownloadAs? {
         val type = obj[TYPE]?.jsonPrimitive?.contentOrNull
         val filename = obj[FILENAME]?.jsonPrimitive?.contentOrNull
         if (type == null || url == null) return null
-        return DownloadAs(format = type, filename = filename ?: "", url = url)
+        return DownloadAs(format = type, filename = createFilename(filename, type), url = url)
+    }
+
+    // TODO: add correct file format
+    private fun createFilename(filename: String?, format: String?): String {
+        return filename ?: ("document_${System.currentTimeMillis()}")
     }
 }