Add local dashcam video library

Co-authored-by: Copilot <[email protected]>

modules/app_dash.py

@@ -33,6 +33,44 @@ DEFAULT_DESTINATION = os.path.join(
     os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "dash", "videos"
 )
 _device_lock = threading.Lock()
+_local_video_state_lock = threading.Lock()
+_local_videos_in_use = {}
+_local_videos_deleting = set()
+
+
+def begin_local_video_use(relative_path):
+    with _local_video_state_lock:
+        if relative_path in _local_videos_deleting:
+            return False
+        _local_videos_in_use[relative_path] = (
+            _local_videos_in_use.get(relative_path, 0) + 1
+        )
+        return True
+
+
+def end_local_video_use(relative_path):
+    with _local_video_state_lock:
+        uses = _local_videos_in_use.get(relative_path, 0)
+        if uses <= 1:
+            _local_videos_in_use.pop(relative_path, None)
+        else:
+            _local_videos_in_use[relative_path] = uses - 1
+
+
+def begin_local_video_delete(relative_path):
+    with _local_video_state_lock:
+        if (
+            relative_path in _local_videos_in_use
+            or relative_path in _local_videos_deleting
+        ):
+            return False
+        _local_videos_deleting.add(relative_path)
+        return True
+
+
+def end_local_video_delete(relative_path):
+    with _local_video_state_lock:
+        _local_videos_deleting.discard(relative_path)
 
 
 def list_usb_storage_partitions():
@@ -275,7 +313,7 @@ def list_dashcam_files(mount_point=DEFAULT_MOUNT_POINT):
                 unmount_device(mount_point)
 
 
-def _safe_video_path(source_folder, relative_path):
+def safe_video_path(source_folder, relative_path):
     if not isinstance(relative_path, str) or not relative_path.strip():
         raise ValueError("A non-empty relative video path is required.")
     if os.path.isabs(relative_path):
@@ -337,7 +375,7 @@ def delete_dashcam_files(relative_path=None, delete_all=False, mount_point=DEFAU
                 targets = find_video_files(source)
             else:
                 try:
-                    target = _safe_video_path(source, relative_path)
+                    target = safe_video_path(source, relative_path)
                 except ValueError as e:
                     result = {"status": "invalid_path", "message": str(e)}
                 except FileNotFoundError:
@@ -353,7 +391,7 @@ def delete_dashcam_files(relative_path=None, delete_all=False, mount_point=DEFAU
                 errors = []
                 for _abs_path, rel_path in targets:
                     try:
-                        safe_path = _safe_video_path(source, rel_path)
+                        safe_path = safe_video_path(source, rel_path)
                         _remove_video_file(safe_path)
                         deleted.append(rel_path)
                     except (OSError, ValueError) as e:
@@ -413,7 +451,7 @@ def copy_files(source_folder, destination_folder, relative_paths=None):
                 continue
             seen.add(relative_path)
             try:
-                abs_path = _safe_video_path(source_folder, relative_path)
+                abs_path = safe_video_path(source_folder, relative_path)
             except ValueError as e:
                 return {
                     "found": 0,