CREATE OR REPLACE FUNCTION update_days_read()
RETURNS TRIGGER AS $$
DECLARE
  pacific_now TIMESTAMPTZ;
  pacific_today DATE;
  last_read DATE;
BEGIN
  SELECT (NOW() AT TIME ZONE 'America/Los_Angeles')::DATE INTO pacific_today;

  SELECT COALESCE(last_read_date::DATE, pacific_today - INTERVAL '1 day') INTO last_read FROM reading_streak LIMIT 1;

  IF last_read < pacific_today - INTERVAL '1 day' THEN
    UPDATE reading_streak
    SET days_read = 0, last_read_date = NOW() AT TIME ZONE 'America/Los_Angeles'
    WHERE id = 1;
  END IF;

  IF last_read IS DISTINCT FROM pacific_today THEN
    UPDATE reading_streak
    SET days_read = days_read + 1, last_read_date = NOW() AT TIME ZONE 'America/Los_Angeles'
    WHERE id = 1;
  END IF;

  RETURN NEW;
END;
$$ LANGUAGE plpgsql;