fix: Add missing method for NFO file syncing

Resolves #674

Author: sparkison

app/Models/StrmFileMapping.php

@@ -825,6 +825,36 @@ protected static function isDirectoryOnlyContainsNfo(string $directory): bool
         }
     }
 
+    /**
+     * Convert a .strm file path to its corresponding .nfo path.
+     *
+     * Rules:
+     * - If a path ends with a slash or is a directory, return "<dir>/tvshow.nfo".
+     * - If a file path ends with ".strm" (case-insensitive), replace it with ".nfo".
+     * - If the path already ends with ".nfo", return it unchanged.
+     * - Otherwise append ".nfo" to the path.
+     */
+    protected static function strmPathToNfoPath(string $path): string
+    {
+        // Directory path -> tvshow.nfo
+        if (str_ends_with($path, '/') || is_dir($path)) {
+            return rtrim($path, '/').'/'.self::TVSHOW_NFO_FILENAME;
+        }
+
+        // Already .nfo -> return as-is
+        if (preg_match('/\.nfo$/i', $path)) {
+            return $path;
+        }
+
+        // Replace .strm with .nfo (case-insensitive)
+        if (preg_match('/\.strm$/i', $path)) {
+            return preg_replace('/\.strm$/i', self::NFO_EXTENSION, $path);
+        }
+
+        // Fallback: append .nfo
+        return $path.self::NFO_EXTENSION;
+    }
+
     /**
      * Clean up all orphaned files for all sync locations
      */