Add "Tipy dne" folder and fix stale genre folder cleanup

tests/test_hardlink_manager.py

@@ -136,11 +136,30 @@ class TestHardlinkManager:
         mirror_link = mirror / "file1.txt"
         os.link(temp_source_dir / "file1.txt", mirror_link)
 
-        manager.sync_structure(files_with_tags, category_roots=roots)
+        manager.sync_structure(
+            files_with_tags, category_roots=roots,
+            reserved_subfolders={"Seriály"})
 
-        # The mirror (not a managed tag folder) is left alone
+        # The mirror (reserved folder) is left alone
         assert mirror_link.exists()
 
+    def test_sync_removes_root_genre_folder_when_last_movie_drops_tag(
+        self, temp_source_dir, temp_output_dir, tag_manager
+    ):
+        """A genre folder at the output root is cleaned when no movie has it."""
+        f = File(temp_source_dir / "file1.txt", tag_manager)
+        f.tags.clear()
+        f.add_tag(Tag("žánr", "Akční"))
+        roots = {"žánr": ""}
+        manager = HardlinkManager(temp_output_dir)
+        manager.sync_structure([f], category_roots=roots)
+        assert (temp_output_dir / "Akční").is_dir()
+
+        # last movie with the tag loses it → folder must go
+        f.tags.clear()
+        manager.sync_structure([f], category_roots=roots)
+        assert not (temp_output_dir / "Akční").exists()
+
     def test_category_transform_groups_folder_by_band(
         self, temp_source_dir, temp_output_dir, tag_manager
     ):
@@ -202,6 +221,40 @@ class TestHardlinkManager:
         assert [p.name for p in folder.iterdir()] == ["1962 - Dr. No.txt"]
         assert removed == 0  # nothing treated as obsolete on the second run
 
+    def test_generate_random_tips_creates_hardlinks(
+        self, files_with_tags, temp_output_dir
+    ):
+        """Tips folder gets `count` random pool files as hardlinks."""
+        manager = HardlinkManager(temp_output_dir)
+        created, fail = manager.generate_random_tips(files_with_tags, count=2)
+
+        tips = temp_output_dir / "Tipy dne"
+        assert created == 2
+        assert fail == 0
+        links = sorted(p.name for p in tips.iterdir())
+        assert len(links) == 2
+        # each is a hardlink to one of the source files
+        srcs = {f.filename for f in files_with_tags}
+        assert set(links) <= srcs
+
+    def test_generate_random_tips_caps_at_available(
+        self, files_with_tags, temp_output_dir
+    ):
+        """Asking for more than available yields all of them, no error."""
+        manager = HardlinkManager(temp_output_dir)
+        created, _ = manager.generate_random_tips(files_with_tags, count=99)
+        assert created == len(files_with_tags)
+
+    def test_generate_random_tips_refreshes_each_run(
+        self, files_with_tags, temp_output_dir
+    ):
+        """A second run replaces the previous selection (folder is emptied)."""
+        manager = HardlinkManager(temp_output_dir)
+        manager.generate_random_tips(files_with_tags, count=1)
+        manager.generate_random_tips(files_with_tags, count=1)
+        tips = temp_output_dir / "Tipy dne"
+        assert len(list(tips.iterdir())) == 1  # not accumulated to 2
+
     def test_dry_run(self, files_with_tags, temp_output_dir):
         """Test dry run (bez skutečného vytváření)"""
         manager = HardlinkManager(temp_output_dir)