-- Move Excel attachment link: product.pef_id -> excel_file.psv_id
SET NAMES utf8mb4;
SET @db := DATABASE();

SET @sql := (
  SELECT IF(COUNT(*) = 0,
    'ALTER TABLE prc_price_excel_file ADD COLUMN psv_id bigint(20) DEFAULT NULL COMMENT ''价格版本id prc_price_set_version.psv_id'' AFTER excel_type, ADD KEY idx_pef_psv (psv_id)',
    'SELECT 1')
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_excel_file' AND COLUMN_NAME = 'psv_id'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @has_psp_pef := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_product' AND COLUMN_NAME = 'pef_id'
);

SET @sql := IF(@has_psp_pef > 0,
  'UPDATE prc_price_excel_file f INNER JOIN (SELECT pef_id, MIN(psv_id) AS psv_id FROM prc_price_set_product WHERE pef_id IS NOT NULL GROUP BY pef_id) x ON x.pef_id = f.pef_id SET f.psv_id = IFNULL(f.psv_id, x.psv_id)',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @sql := (
  SELECT IF(COUNT(*) > 0,
    'ALTER TABLE prc_price_set_product DROP INDEX idx_psp_pef_id',
    'SELECT 1')
  FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_product' AND INDEX_NAME = 'idx_psp_pef_id'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @sql := (
  SELECT IF(COUNT(*) > 0,
    'ALTER TABLE prc_price_set_product DROP COLUMN pef_id',
    'SELECT 1')
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_product' AND COLUMN_NAME = 'pef_id'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;