-- prc_order_bill.refund_status
SET NAMES utf8mb4;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_order_bill'
    AND COLUMN_NAME = 'refund_status'
  LIMIT 1
);
SET @sql := IF(
  @col IS NULL,
  'ALTER TABLE prc_order_bill ADD COLUMN refund_status varchar(20) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT ''NONE'' COMMENT ''退费状态：NONE未退费/REFUNDED已退费'' AFTER credit_arrears_status, ADD KEY idx_order_bill_refund_status (refund_status)',
  'SELECT 1'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

UPDATE prc_order_bill b
SET b.refund_status = 'REFUNDED'
WHERE EXISTS (
  SELECT 1 FROM prc_income_bill_fee f
   WHERE f.bill_id = b.bill_id
     AND UPPER(f.fee_type) = 'REFUND'
)
AND (b.refund_status IS NULL OR b.refund_status <> 'REFUNDED');

UPDATE prc_order_bill b
SET b.refund_status = 'NONE'
WHERE (b.refund_status IS NULL OR b.refund_status = '')
  AND NOT EXISTS (
    SELECT 1 FROM prc_income_bill_fee f
     WHERE f.bill_id = b.bill_id
       AND UPPER(f.fee_type) = 'REFUND'
  );