fix(import): re-offer imported requests whose files left the library

tests/test_import_flow.py

@@ -1,4 +1,5 @@
 import importlib
+import shutil
 from pathlib import Path
 
 import pytest
@@ -820,3 +821,71 @@ def test_relocate_refuses_to_overwrite(client):
     assert res.status_code == 409
     assert (occupied / "fremd.mp3").exists()
     assert (root / "Erstes" / "Erstes - Part 01.mp3").exists()
+
+
+def test_files_moved_back_are_matched_against_imported_requests(client):
+    """Moving a library folder back into the download dir: the request still says
+    "imported", but its files are gone - the scan should suggest it anyway."""
+    root = client.tmp_path / "library" / "kids"
+    lib_id = client.post("/api/libraries", json={
+        "name": "kids", "media_type": "audiobook", "root_path": str(root),
+        "folder_template": "{Series}/{Volume} - {Title}", "file_template": "{Title}",
+    }).json()["id"]
+    req_id = client.post("/api/requests", json={
+        "library_id": lib_id, "title": "Die Zeitreisende",
+        "series": "Die drei ???", "volume": 194,
+    }).json()["id"]
+
+    src = client.downloads / "194 - Die Zeitreisende"
+    src.mkdir()
+    for i in (1, 2):
+        (src / f"{i:02d}.mp3").write_bytes(b"")
+    dest = Path(client.post("/api/import", json={"items": [{
+        "path": str(src), "is_dir": True,
+        "files": [str(f) for f in sorted(src.iterdir())], "request_id": req_id,
+    }]}).json()["results"][0]["dest"])
+
+    # while the files are in place the request is not offered again
+    scan = client.get("/api/import/scan").json()
+    assert scan["orphaned_request_ids"] == []
+
+    # now move the folder back into the download dir, as the user did
+    shutil.move(str(dest), client.downloads / dest.name)
+    scan = client.get("/api/import/scan").json()
+    assert scan["orphaned_request_ids"] == [req_id]
+    item = next(i for i in scan["items"] if i["name"] == dest.name)
+    assert item["suggested_request_id"] == req_id
+
+    res = client.post("/api/import", json={"items": [{
+        "path": item["path"], "is_dir": True, "files": item["files"],
+        "request_id": req_id,
+    }]}).json()["results"][0]
+    assert res["ok"], res
+    assert Path(res["dest"]) == root / "Die drei ???" / "194 - Die Zeitreisende"
+    assert sorted(p.name for p in Path(res["dest"]).iterdir()) == [
+        "Die Zeitreisende - Part 01.mp3", "Die Zeitreisende - Part 02.mp3",
+    ]
+
+
+def test_imported_request_with_files_in_place_is_still_refused(client):
+    lib_id = client.post("/api/libraries", json={
+        "name": "L", "media_type": "audiobook", "root_path": str(client.tmp_path / "l"),
+    }).json()["id"]
+    req_id = client.post("/api/requests",
+                         json={"library_id": lib_id, "title": "X"}).json()["id"]
+    src = client.downloads / "a"
+    src.mkdir()
+    (src / "1.mp3").write_bytes(b"")
+    (src / "2.mp3").write_bytes(b"")
+    client.post("/api/import", json={"items": [{
+        "path": str(src), "is_dir": True,
+        "files": [str(src / "1.mp3"), str(src / "2.mp3")], "request_id": req_id,
+    }]})
+    again = client.downloads / "b"
+    again.mkdir()
+    (again / "1.mp3").write_bytes(b"")
+    res = client.post("/api/import", json={"items": [{
+        "path": str(again), "is_dir": False, "files": [str(again / "1.mp3")],
+        "request_id": req_id,
+    }]}).json()["results"][0]
+    assert not res["ok"] and "bereits importiert" in res["error"]