add(aduio): tagging files

tests/test_import_flow.py

@@ -134,3 +134,37 @@ def test_bulk_requests_and_split_scan(client):
     by_name = {i["name"]: i["suggested_request_id"] for i in items}
     expected = {f"Die drei Fragezeichen - Folge {n:03d}": created[n - 1]["id"] for n in (1, 2, 3)}
     assert by_name == expected
+
+
+def test_audio_tags_written_on_import(client):
+    from mutagen.id3 import ID3
+
+    root = client.tmp_path / "library" / "kids_audio"
+    lib_id = client.post("/api/libraries", json={
+        "name": "KidsAudio", "media_type": "audiobook", "root_path": str(root),
+    }).json()["id"]
+    req_id = client.post("/api/requests", json={
+        "library_id": lib_id, "title": "Die drei ??? Kids Folge 085",
+        "authors": "Ulf Blanck", "series": "Die drei ??? Kids", "volume": 85,
+    }).json()["id"]
+
+    book_dir = client.downloads / "Kids 85 Schnueffler"
+    book_dir.mkdir()
+    for i in range(2):
+        (book_dir / f"track{i}.mp3").write_bytes(b"")
+
+    items = client.get("/api/import/scan").json()["items"]
+    resp = client.post("/api/import", json={"items": [{
+        "path": items[0]["path"], "is_dir": True,
+        "files": items[0]["files"], "request_id": req_id,
+    }]})
+    assert resp.json()["results"][0]["ok"]
+
+    dest = root / "Ulf Blanck" / "Die drei Kids Folge 085"  # "?" is stripped from paths
+    files = sorted(dest.iterdir())
+    tags = ID3(files[0])
+    assert str(tags["TALB"]) == "Die drei ??? Kids Folge 085"
+    assert str(tags["TPE1"]) == "Ulf Blanck"
+    assert str(tags["TXXX:SERIES"]) == "Die drei ??? Kids"
+    assert str(tags["TXXX:SERIES-PART"]) == "85"
+    assert str(tags["TRCK"]) == "1/2"