-- +goose Up
ALTER TABLE library_sources ADD COLUMN excluded_dirs text[] NOT NULL DEFAULT '{}';

-- +goose StatementBegin
CREATE FUNCTION library_path_excluded(rel_path text, excluded_dirs text[])
RETURNS boolean LANGUAGE sql IMMUTABLE PARALLEL SAFE AS $$
  SELECT EXISTS (
    SELECT 1 FROM unnest(excluded_dirs) AS d(dir)
    WHERE rel_path = dir OR starts_with(rel_path, dir || '/')
  );
$$;
-- +goose StatementEnd

-- Keep historical jobs and files; only tracks whose every known file is excluded are suppressed.
-- +goose StatementBegin
CREATE FUNCTION library_track_scan_excluded(track uuid)
RETURNS boolean LANGUAGE sql STABLE AS $$
  SELECT EXISTS (SELECT 1 FROM media_files WHERE track_id = track)
    AND NOT EXISTS (
      SELECT 1 FROM media_files f JOIN library_sources s ON s.id = f.source_id
      WHERE f.track_id = track AND NOT library_path_excluded(f.rel_path, s.excluded_dirs)
    );
$$;
-- +goose StatementEnd

-- +goose Down
DROP FUNCTION library_track_scan_excluded(uuid);
DROP FUNCTION library_path_excluded(text, text[]);
ALTER TABLE library_sources DROP COLUMN excluded_dirs;