Reported on Discord by winecountrygames. The library "Reorganize" tool
had several layered bugs that all traced to the same root cause: the
endpoint reinvented every wheel post-processing already turns — its own
template engine, its own disc-number resolution from file tags, its own
sidecar sweep, its own collision detection — and each had drifted from
the canonical path used by fresh downloads. Reported symptoms:
- 3-disc Aerosmith deluxe collapsed to a flat single-disc layout
- Half the tracks on other albums silently skipped, no error / no count
- Re-runs left empty leftover album folders cluttering the artist dir
Architecture: stop reinventing wheels. Route reorganize through exactly
the same pipeline downloads use. Per-album:
1. Fetch the canonical tracklist from a metadata source (Spotify /
iTunes / Deezer / Discogs / Hydrabase) using the album's stored
source IDs. New `core/library_reorganize.py::plan_album_reorganize`
does this — primary-source-first, fall through priority chain
unless the user picked a specific source in the modal (strict mode).
2. For each local track, find the matching API entry via a scored
candidate matcher. Score components: exact-title (100),
substring-with-length-ratio (40-90), track-number agreement (20).
Hard reject when the two titles have different version
differentiators (Remix vs no-remix means different recordings,
not annotation drift). Below threshold = unmatched, surfaced as
"not in source's tracklist, left in place" rather than silently
mis-routing.
3. Copy the file to a per-album staging directory, build the same
context dict the import flow builds (`spotify_album` /
`track_info` / etc. with `is_album_download=True` so the path
builder enters ALBUM mode, not SINGLE mode), call
`_post_process_matched_download(...)` — same function fresh
downloads use. Post-process handles tagging, multi-disc subfolder
decisions, sidecar regeneration, AcoustID verification.
4. Read `context['_final_processed_path']` to learn where it landed.
Update `tracks.file_path` in the DB BEFORE removing the original
(DB-update failure leaves the file at both locations, recoverable
via library scan; the reverse would orphan the row). Delete
per-track sidecars (post-process recreates them at the new
destination).
3 concurrent workers per album via ThreadPoolExecutor, matching the
download path's per-batch worker count. State mutations all guarded by
a single lock; staging filenames carry a UUID prefix so concurrent
copies of identically-named source files don't overwrite each other.
Source picker in the modal lets the user choose which source to read
the tracklist from. Two endpoints feed it:
- `/api/library/album/<id>/reorganize/sources` — sources for THIS
album that are both authed AND have a stored ID. For the per-
album modal.
- `/api/library/reorganize/sources` — all authed sources globally.
For the bulk "Reorganize All" modal where per-album ID coverage
varies.
When the user picks a specific source, the orchestrator runs in
`strict_source=True` mode (no fallback chain) — picking Spotify means
"use Spotify or fail", not "use Spotify and silently fall back."
Preview endpoint shares the same planning logic as apply via
`preview_album_reorganize` — the destination path comes from the same
`_build_final_path_for_track` post-process uses, so what you see in
the preview is exactly what you get on apply.
Empty destination folders (from earlier failed runs OR from the
current run when post-process creates a dir then fails AcoustID)
get cleaned up after each successful run: walk up to the artist
folder from any successful destination, prune empty album-sibling
folders one level deep. Bounded scope = won't touch unrelated user
dirs.
Web_server.py shrinks by ~450 net lines. The endpoint handler is now
a thin wrapper that builds injected callables (path resolver, post-
process function, DB updater, empty-dir cleaner), spawns a thread
that calls `reorganize_album()`, and returns. All actual logic lives
in `core/library_reorganize.py` where it's unit-testable without
spinning up Flask.
Frontend cleanup: the per-call template input in both reorganize
modals (per-album and bulk) was redundant — the backend always uses
the configured global download template. Removed the input and the
variables-grid reference UI it was for.
39 new unit tests pin every contract:
- source resolution (no_source_id when album has none, fallthrough
chain when primary returns nothing, strict mode bypasses fallback)
- matcher scoring (exact / substring / multi-disc disambiguation /
smart-quote tolerance / dash-vs-parens / bonus-track substring /
Remix-vs-original differentiator rejection / "Real" doesn't false-
match "Real Real Real" / track-number-only no longer fires)
- file safety (DB-update failure leaves original in place, post-
process failure leaves original in place, post-process exception
caught and original preserved, success removes original AND
updates DB in the right order)
- sidecar handling (per-track .lrc/.nfo deleted on success, kept on
failure; album-level cover.jpg/folder.jpg cleaned only when
directory has no remaining audio)
- staging cleanup (recreated between tracks because post-process
nukes it, dir cleaned up on success AND on failure)
- destination-dir prune (empty siblings removed, real album with
files preserved, no recursive sweep)
- source picker (only authed-with-stored-ID sources for per-album,
all authed sources for bulk; strict mode doesn't fall back)
- concurrency (3 workers in flight, state stays consistent under
races, stop_check cuts off pending tasks)
- preview parity (preview produces same destination as apply for
multi-disc; ALBUM mode not SINGLE mode; unmatched/no-path tracks
surfaced with reasons)
Limitations (deliberate punts, NOT in this PR):
- Renamed local titles on multi-disc albums where track_number
also disagrees: matcher returns nothing (track is "not in
source"). Fixable by using duration_ms as a tertiary signal.
- Per-track in-modal source switching with per-album track-count
hints (would need a second API call before opening the modal).
- UI status panel on the artist page during a run — currently
just toasts. Documented as a follow-up PR.
Files:
- core/library_reorganize.py — new module: plan_album_reorganize,
preview_album_reorganize, reorganize_album, available_sources_for_album,
authed_sources, _score_candidate, helpers for staging/post-
processing/finalizing, sidecar + dest-dir cleanup
- core/metadata_service.py — no changes; reused get_album_for_source,
get_album_tracks_for_source, get_source_priority,
get_client_for_source
- web_server.py — three endpoints (preview / apply / sources GETs)
are thin wrappers; -450 net lines
- tests/test_library_reorganize_orchestrator.py — 39 tests covering
every contract above
- webui/static/library.js — source picker UI in both modals; dead
template input + variables-grid removed
- webui/static/style.css — dropdown option styling fix (white-on-
white was unreadable)
Reported on Discord by winecountrygames — his bug report named the
trigger button (Enhanced view → Reorganize All) and both symptoms
(multi-disc collapse, half-album skip), which let the diagnosis go
straight to the architectural problem.
2b15260b88