-- prc_surcharge: drop calc_rule; keep dict_value / block_title; charge_type stores billing mode
SET NAMES utf8mb4;

-- If calc_rule exists, copy into charge_type then drop
SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_surcharge'
    AND COLUMN_NAME = 'calc_rule'
  LIMIT 1
);
SET @sql := IF(@col IS NULL,
  'SELECT 1',
  'UPDATE prc_surcharge SET charge_type = calc_rule WHERE calc_rule IS NOT NULL AND calc_rule <> ''''');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_surcharge'
    AND COLUMN_NAME = 'calc_rule'
  LIMIT 1
);
SET @sql := IF(@col IS NULL,
  'SELECT 1',
  'ALTER TABLE prc_surcharge DROP COLUMN calc_rule');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_surcharge'
    AND COLUMN_NAME = 'dict_value'
  LIMIT 1
);
SET @sql := IF(@col IS NULL,
  'ALTER TABLE prc_surcharge ADD COLUMN dict_value varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT ''渠道产品 payment_product_type.dict_value'' AFTER charge_type',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_surcharge'
    AND COLUMN_NAME = 'block_title'
  LIMIT 1
);
SET @sql := IF(@col IS NULL,
  'ALTER TABLE prc_surcharge ADD COLUMN block_title varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT ''分区/区块（pay_postcode_group.block_title）'' AFTER country_code',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- legacy amount modes: FIXED -> ALWAYS; RATE no longer used as amount mode -> MANUAL
UPDATE prc_surcharge SET charge_type = 'ALWAYS' WHERE charge_type IS NULL OR charge_type = '' OR upper(charge_type) = 'FIXED';
UPDATE prc_surcharge SET charge_type = 'MANUAL' WHERE upper(charge_type) = 'RATE';