-- 存量库：分区明细增加匹配维度/方式/前缀长度（可重复执行）
SET @db := DATABASE();

SET @col := (
  SELECT COUNT(1)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_kpi_area_info'
    AND COLUMN_NAME = 'MatchDim'
);
SET @sql := IF(
  @col = 0,
  'ALTER TABLE `t_kpi_area_info`
    ADD COLUMN `MatchDim` VARCHAR(16) NOT NULL DEFAULT ''country'' COMMENT ''匹配维度：zip/state/city/country'' AFTER `RightPostcode`,
    ADD COLUMN `MatchMode` VARCHAR(16) NOT NULL DEFAULT ''all'' COMMENT ''匹配方式：prefix/exact/range/all'' AFTER `MatchDim`,
    ADD COLUMN `PrefixLen` INT NOT NULL DEFAULT 0 COMMENT ''邮编前缀长度（zip+prefix）'' AFTER `MatchMode`',
  'SELECT ''kpi area match columns already exist'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @idx := (
  SELECT COUNT(1)
  FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_kpi_area_info'
    AND INDEX_NAME = 'idx_kpi_info_area_dim'
);
SET @sql := IF(
  @idx = 0,
  'ALTER TABLE `t_kpi_area_info` ADD KEY `idx_kpi_info_area_dim` (`AreaId`, `CountryCode`, `MatchDim`)',
  'SELECT ''idx_kpi_info_area_dim already exists'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

UPDATE `t_kpi_area_info`
SET
  `MatchDim` = CASE
    WHEN IFNULL(`LeftPostcode`, '') <> '' OR IFNULL(`RightPostcode`, '') <> '' THEN 'zip'
    WHEN IFNULL(`City`, '') <> '' THEN 'city'
    WHEN IFNULL(`Province`, '') <> '' THEN 'state'
    ELSE 'country'
  END,
  `MatchMode` = CASE
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND IFNULL(`RightPostcode`, '') = '' THEN 'prefix'
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND `LeftPostcode` = `RightPostcode` THEN 'exact'
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND IFNULL(`RightPostcode`, '') <> '' THEN 'range'
    WHEN IFNULL(`City`, '') <> '' OR IFNULL(`Province`, '') <> '' THEN 'exact'
    ELSE 'all'
  END,
  `PrefixLen` = CASE
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND IFNULL(`RightPostcode`, '') = '' THEN CHAR_LENGTH(`LeftPostcode`)
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND `LeftPostcode` = `RightPostcode` THEN CHAR_LENGTH(`LeftPostcode`)
    WHEN IFNULL(`LeftPostcode`, '') <> '' AND IFNULL(`RightPostcode`, '') <> '' THEN LEAST(CHAR_LENGTH(`LeftPostcode`), CHAR_LENGTH(`RightPostcode`))
    ELSE 0
  END
WHERE IFNULL(`MatchDim`, '') IN ('', 'country')
  AND (
    IFNULL(`LeftPostcode`, '') <> ''
    OR IFNULL(`RightPostcode`, '') <> ''
    OR IFNULL(`Province`, '') <> ''
    OR IFNULL(`City`, '') <> ''
  );