-- Removes persisted sprint status; sprint state is derived from start/end dates.
-- Safe to run multiple times.

BEGIN;

ALTER TABLE public.sprints DROP COLUMN IF EXISTS status;

CREATE OR REPLACE FUNCTION public.complete_ended_sprints_and_rollover()
RETURNS void
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = public
AS $$
DECLARE
  ended_sprint RECORD;
  next_sprint_id UUID;
BEGIN
  FOR ended_sprint IN
    SELECT id
    FROM public.sprints
    WHERE end_date < CURRENT_DATE
    ORDER BY end_date ASC, start_date ASC
  LOOP
    SELECT s.id
      INTO next_sprint_id
    FROM public.sprints s
    WHERE s.end_date >= CURRENT_DATE
      AND s.id <> ended_sprint.id
    ORDER BY s.start_date ASC
    LIMIT 1;

    IF next_sprint_id IS NOT NULL THEN
      UPDATE public.tasks
      SET sprint_id = next_sprint_id
      WHERE sprint_id = ended_sprint.id
        AND status NOT IN ('done', 'canceled', 'archived');
    END IF;
  END LOOP;
END;
$$;

COMMIT;