-- name: UpsertTrackLoudness :exec
-- Written when the backfill measures a track (#4995). Replaces the row
-- wholesale: a measurement of the old bytes has no standing once the file has
-- changed.
INSERT INTO track_loudness (
    track_id, integrated_lufs, true_peak_dbtp, loudness_range_lu,
    block_hist_start, block_hist, unreadable, analysis_version
) VALUES (
    sqlc.arg(track_id), sqlc.narg(integrated_lufs), sqlc.narg(true_peak_dbtp),
    sqlc.narg(loudness_range_lu), sqlc.narg(block_hist_start), sqlc.narg(block_hist),
    sqlc.arg(unreadable), sqlc.arg(analysis_version)
)
ON CONFLICT (track_id) DO UPDATE SET
    integrated_lufs   = EXCLUDED.integrated_lufs,
    true_peak_dbtp    = EXCLUDED.true_peak_dbtp,
    loudness_range_lu = EXCLUDED.loudness_range_lu,
    block_hist_start  = EXCLUDED.block_hist_start,
    block_hist        = EXCLUDED.block_hist,
    unreadable        = EXCLUDED.unreadable,
    analysis_version  = EXCLUDED.analysis_version,
    analyzed_at       = now();

-- name: DeleteTrackLoudness :exec
-- The scan saw new bytes at this path. The stored measurement describes the old
-- ones, so it goes, and the backfill measures the file again.
DELETE FROM track_loudness WHERE track_id = $1;

-- name: ListTracksNeedingLoudness :many
-- The backfill's work queue: tracks with no measurement, or one taken by an
-- older method. Keyset-paged on id so a pass visits each track at most once;
-- an inconclusive attempt writes no row, and without the cursor a file that
-- keeps timing out would be listed again straight away. Missing tracks are
-- skipped: there is no file to read.
SELECT t.id, t.file_path, t.duration_ms
  FROM tracks t
  LEFT JOIN track_loudness l ON l.track_id = t.id
 WHERE t.missing_since IS NULL
   AND (l.track_id IS NULL OR l.analysis_version < sqlc.arg(current_version))
   AND t.id > sqlc.arg(after_id)
 ORDER BY t.id
 LIMIT sqlc.arg(batch_limit);

-- name: GetLoudnessCoverage :one
-- The admin gauge. measured + silent + unreadable + pending = total. Missing
-- tracks are excluded, or the gauge could never reach the end.
SELECT count(*)::bigint AS total,
       count(*) FILTER (
           WHERE l.analysis_version >= sqlc.arg(current_version)
             AND l.integrated_lufs IS NOT NULL
       )::bigint AS measured,
       count(*) FILTER (
           WHERE l.analysis_version >= sqlc.arg(current_version)
             AND l.integrated_lufs IS NULL AND NOT l.unreadable
       )::bigint AS silent,
       count(*) FILTER (
           WHERE l.analysis_version >= sqlc.arg(current_version)
             AND l.unreadable
       )::bigint AS unreadable,
       count(*) FILTER (
           WHERE l.track_id IS NULL OR l.analysis_version < sqlc.arg(current_version)
       )::bigint AS pending
  FROM tracks t
  LEFT JOIN track_loudness l ON l.track_id = t.id
 WHERE t.missing_since IS NULL;

-- name: GetLoudnessSettings :one
SELECT * FROM loudness_settings WHERE id = true;

-- name: UpdateLoudnessSettings :one
-- Whole-row write from the admin card; migration 0065's CHECK is the backstop
-- behind the service's own validation.
UPDATE loudness_settings
   SET enabled              = sqlc.arg(enabled),
       backfill_concurrency = sqlc.arg(backfill_concurrency),
       updated_at           = now()
 WHERE id = true
RETURNING *;