feat(uploads): preview storage paths, detect templates, attach covers and withdraw batches

services/api/internal/uploads/store.go

@@ -98,7 +98,7 @@ type Reserved struct {
 
 // CreateBatch создаёт пачку и резервирует место под файлы: проверка «занято + запрошено ≤ лимит»
 // под блокировкой строки счётчика (docs/uploads.md#3). Дубли по SHA-256 отклоняются, не занимая места.
-func (st *Store) CreateBatch(ctx context.Context, author uuid.UUID, comment *string, files []NewFile, s Settings) (uuid.UUID, []Reserved, error) {
+func (st *Store) CreateBatch(ctx context.Context, author uuid.UUID, comment *string, files []NewFile, s Settings, coverPath *string) (uuid.UUID, []Reserved, error) {
 	tx, err := st.pool.Begin(ctx)
 	if err != nil {
 		return uuid.Nil, nil, fmt.Errorf("uploads: create batch: %w", err)
@@ -116,8 +116,8 @@ func (st *Store) CreateBatch(ctx context.Context, author uuid.UUID, comment *str
 	}
 
 	batchID := newID()
-	if _, err := tx.Exec(ctx, `INSERT INTO upload_batches (id, author_id, comment) VALUES ($1, $2, $3)`,
-		batchID, author, comment); err != nil {
+	if _, err := tx.Exec(ctx, `INSERT INTO upload_batches (id, author_id, comment, cover_path) VALUES ($1, $2, $3, $4)`,
+		batchID, author, comment, coverPath); err != nil {
 		return uuid.Nil, nil, fmt.Errorf("uploads: insert batch: %w", err)
 	}
 	out := make([]Reserved, 0, len(files))
@@ -231,9 +231,10 @@ const fileColumns = `f.id, f.batch_id, f.author_id, u.username, b.comment, f.sta
 	f.size_bytes, f.received_bytes, f.sha256, coalesce(f.staging_path, ''), f.format, f.codec, f.bitrate, f.sample_rate,
 	f.bit_depth, f.duration_ms, f.tags, f.metadata, f.metadata_edited, f.matched_artist_id, f.matched_album_id,
 	f.duplicate_of_track_id, f.duplicate_level, f.possible_duplicate, f.quality_upgrade, f.target_source_id, f.target_rel_path,
-	f.status_reason, f.reviewed_by, f.reviewed_at, f.imported_file_id, b.cover_path, f.created_at, f.updated_at`
+	f.status_reason, f.reviewed_by, f.reviewed_at, f.imported_file_id, b.cover_path, f.created_at, f.updated_at, src.name`
 
-const fileFrom = ` FROM upload_files f JOIN upload_batches b ON b.id = f.batch_id JOIN users u ON u.id = f.author_id`
+const fileFrom = ` FROM upload_files f JOIN upload_batches b ON b.id = f.batch_id JOIN users u ON u.id = f.author_id
+	LEFT JOIN library_sources src ON src.id = f.target_source_id`
 
 func scanFile(row pgx.Row) (File, error) {
 	var (
@@ -244,7 +245,7 @@ func scanFile(row pgx.Row) (File, error) {
 		&f.ClientRelPath, &f.Size, &f.Received, &f.SHA256, &f.StagingPath, &f.Format, &f.Codec, &f.Bitrate, &f.SampleRate,
 		&f.BitDepth, &f.DurationMs, &tags, &meta, &f.MetadataEdited, &f.MatchedArtistID, &f.MatchedAlbumID,
 		&f.DuplicateOfTrackID, &f.DuplicateLevel, &f.PossibleDuplicate, &f.QualityUpgrade, &f.TargetSourceID, &f.TargetRelPath,
-		&f.StatusReason, &f.ReviewedBy, &f.ReviewedAt, &f.ImportedFileID, &f.CoverPath, &f.CreatedAt, &f.UpdatedAt)
+		&f.StatusReason, &f.ReviewedBy, &f.ReviewedAt, &f.ImportedFileID, &f.CoverPath, &f.CreatedAt, &f.UpdatedAt, &f.TargetSourceName)
 	if errors.Is(err, pgx.ErrNoRows) {
 		return File{}, ErrNotFound
 	}
@@ -348,7 +349,9 @@ func (st *Store) NextWithStatus(ctx context.Context, s Status) (File, error) {
 
 // StagingInUse — пути staging файлов, которым он ещё нужен (сверка при старте).
 func (st *Store) StagingInUse(ctx context.Context) (map[string]bool, error) {
-	rows, err := st.pool.Query(ctx, `SELECT staging_path FROM upload_files WHERE status::text = ANY($1) AND staging_path IS NOT NULL`,
+	rows, err := st.pool.Query(ctx, `SELECT staging_path FROM upload_files WHERE status::text = ANY($1) AND staging_path IS NOT NULL
+		UNION SELECT b.cover_path FROM upload_batches b JOIN upload_files f ON f.batch_id = b.id
+		WHERE f.status::text = ANY($1) AND b.cover_path IS NOT NULL`,
 		occupyingStatuses)
 	if err != nil {
 		return nil, fmt.Errorf("uploads: staging in use: %w", err)
@@ -364,6 +367,17 @@ func (st *Store) StagingInUse(ctx context.Context) (map[string]bool, error) {
 	return out, nil
 }
 
+// UnusedBatchCover returns a cover only after every file in its batch has released staging.
+func (st *Store) UnusedBatchCover(ctx context.Context, batch uuid.UUID) (*string, error) {
+	var cover *string
+	err := st.pool.QueryRow(ctx, `SELECT b.cover_path FROM upload_batches b WHERE b.id = $1
+		AND NOT EXISTS (SELECT 1 FROM upload_files f WHERE f.batch_id = b.id AND f.status::text = ANY($2))`, batch, occupyingStatuses).Scan(&cover)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, nil
+	}
+	return cover, err
+}
+
 // Stale — недокачанные файлы старше before.
 func (st *Store) Stale(ctx context.Context, before time.Time) ([]uuid.UUID, error) {
 	rows, err := st.pool.Query(ctx, `SELECT id FROM upload_files WHERE status = 'uploading' AND updated_at < $1`, before)