-- Consolidate single_elimination_playoff and page_playoff → playoff_bracket
-- PostgreSQL does not support DROP VALUE on enums, so we recreate the type.
-- Wrapped in DO block so re-running is safe if already applied.

DO $$
BEGIN
  -- Only migrate if the old enum values still exist
  IF EXISTS (
    SELECT 1 FROM pg_enum
    WHERE enumlabel = 'single_elimination_playoff'
      AND enumtypid = (SELECT oid FROM pg_type WHERE typname = 'scoring_pattern')
  ) THEN
    -- Step 1: Create new consolidated enum
    CREATE TYPE "scoring_pattern_new" AS ENUM('playoff_bracket', 'season_standings', 'qualifying_points');

    -- Step 2: Migrate column data, mapping old values to playoff_bracket
    ALTER TABLE "sports_seasons"
      ALTER COLUMN "scoring_pattern" TYPE "scoring_pattern_new"
      USING (
        CASE scoring_pattern::text
          WHEN 'single_elimination_playoff' THEN 'playoff_bracket'::scoring_pattern_new
          WHEN 'page_playoff'               THEN 'playoff_bracket'::scoring_pattern_new
          ELSE scoring_pattern::text::scoring_pattern_new
        END
      );

    -- Step 3: Replace old type
    DROP TYPE "scoring_pattern";
    ALTER TYPE "scoring_pattern_new" RENAME TO "scoring_pattern";
  END IF;
END $$;