[chodeus]

Summary

When a flagged file has a Lidarr track file ID, the delete goes only through Lidarr's bulk track-file delete, and Lidarr removes the file at its own path. So a wrong match deletes Lidarr's copy and leaves the flagged file on disk. The lookups that give flagged files their IDs could match a file that isn't Lidarr's:

• A second copy of an album (say /data/Incoming/Artist/Album/01.flac) matched Lidarr's /data/Artist/Album/01.flac, because the path ending is the same.
• The scan lookup accepted a file whose name only one Lidarr track file has. The lookup before a delete did too when its stricter pass found nothing. So /data/Artist/Album (Deluxe)/07.flac matched Lidarr's /data/Artist/Album/07.flac.
• The stricter pass needed only the filename and its folder to match. So Album (Deluxe)/CD1/07.flac matched Album/CD1/07.flac, and Other/Greatest Hits/01.flac matched another artist's album with that title.

#314 added a check for this, but only to the whole-folder lookup (_another_copy_exists).

Now:

• _is_lidarr_copy (new) holds the rule. Lidarr's track file is the flagged file only when the whole path from the artist folder down is the same, Lidarr's path isn't a different file on this disk, and the same path under the artist folder doesn't also exist higher in the library. _pick_lidarr_copy applies the rule to a list of candidates. The scan lookup, the lookup before a delete and the folder lookup from fix: send a folder delete's tracked files through Lidarr when Lidarr doesn't track the flagged file #314 all call it. The lookup before a delete no longer has its loose pass.
• The index the scan builds now holds each track file's artist folder.
• Before every delete, _drop_wrong_lidarr_matches checks the IDs saved by earlier scans again. It reads Lidarr's artist list and clears a saved match that fails the rule, has no saved Lidarr path, or belongs to an artist Lidarr no longer lists. The lookup that follows tries those files again. If the artist list can't be read, nothing is deleted. The cleared fields are written back to corrupt_details.json, because auto-delete reads that file again.
• A whole-folder delete also checks the saved IDs of the folder's other files again, including files that are no longer in corrupt.txt.

A flagged file with no match is deleted directly, as before. Behaviour changes:

• Some files Lidarr does track are no longer matched: those whose path differs from Lidarr's below the artist folder, for example when BeatsCheck's music folder points inside an artist folder. They are deleted directly, with no blocklist entry and no search. docs/lidarr.md now says the scanned folder must hold the artist folders.
• When Lidarr can't be read, a delete whose files all have saved IDs now stops with "Lidarr lookup failed" before it deletes anything. Before, it continued and failed at Lidarr's delete call, and files in the same batch with no ID were still deleted directly.
• A delete with saved IDs makes one more request (the artist list).

docs/lidarr.md describes the rule under Path handling, and the folder-delete bullet now refers to it.

Testing

• New tests/test_lidarr_copy_match.py (8 tests, 24 cases) stubs the Lidarr API around files in a temporary library. Lidarr sees the library at the same path or at a different one.
  • None of these gets an ID, at scan time or in the lookup before a delete: a second copy higher in the library (same and different mount path), another edition with the same file names (flat and with a disc folder), and another artist's album with the same title.
  • Lidarr's own file still gets its ID at both mount paths, and a Windows-style Lidarr path still matches.
  • A wrong match saved by an older scan: the WebUI file delete, the WebUI whole-folder delete and auto-delete remove the flagged copy directly. Lidarr's bulk delete isn't called, and Lidarr's copies stay.
  • A saved match is looked up again when it has no Lidarr path, when Lidarr no longer lists its artist, or when the artist moved to another root folder. A saved match isn't trusted when Lidarr can't be read.
  • A whole-folder delete checks the saved match of a file in the folder that isn't in corrupt.txt, and the folder lookup stops when saved matches can't be checked.
• test_only_the_files_being_deleted_are_looked_up now saves a valid match with its Lidarr path and expects one artist-list read. It still checks that the file not being deleted isn't looked up.
• On the old code, 21 of the 25 new or changed cases fail. The 4 that pass are the guards that Lidarr's own file still gets its ID.
• Each test was checked against mutations of the code it covers. All 15 mutations were caught, and removing the whole-folder check fails its 2 tests.
• Full suite: 421 passed. flake8, ruff and node --check clean.

Summary by CodeRabbit

• Bug Fixes
  • Improved Lidarr file matching to reject saved matches that no longer correspond to the current artist folder and file location.
  • Deletion now rechecks saved matches and avoids deleting Lidarr tracks when a flagged file is a separate copy.
  • When Lidarr is unavailable for verification, deletion stops rather than relying on unchecked saved matches.
• Documentation
  • Clarified Lidarr matching and deletion behavior, including path requirements and handling of unmatched files.

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📝 Walkthrough

Lidarr trackfile matching now checks artist-relative paths and conflicting copies. Before deletion, the application revalidates saved matches against current Lidarr data, clears invalid matches, and stops when required lookups fail.

Changes: Lidarr match validation

Layer / File(s)	Summary
Artist-relative path matching app/main.py, tests/test_lidarr_copy_match.py, docs/lidarr.md	Indexed trackfiles now include the artist path. Matching checks the relative path under that artist folder and validates that no conflicting copy exists. Tests cover matching across mount roots and Windows-style paths. The documentation describes the path rules.
Saved-match revalidation before deletion app/main.py, tests/test_lidarr_copy_match.py, tests/test_lidarr_ids_before_delete.py, docs/lidarr.md	Before deletion, saved matches are checked against current Lidarr artist paths. Invalid saved fields are cleared and looked up again. Lookup failures stop deletion. Tests cover file, folder, and automatic deletion, stale matches, and unavailable Lidarr responses. The documentation describes the recheck behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to 35489

The fallback conditions could be clearer, but this does not block merging.

Pre-merge checks: 4

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title follows Conventional Commits with the fix type and accurately describes the main behavior change: preventing a flagged file from being matched to and deleting Lidarr’s valid copy.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @docs/lidarr.md:
- Line 15: Clarify the stored-ID fallback in the “Scan” description: state that
BeatsCheck uses the stored ID only when the current album lookup returns no
track files or no current track file matches; otherwise, remove the fallback
claim if that is not the intended behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3dc3acc and 354893c.

📒 Files selected for processing: 4

• app/main.py
• docs/lidarr.md
• tests/test_lidarr_copy_match.py
• tests/test_lidarr_ids_before_delete.py

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