-- Copyright (c) 2014, 2023, Oracle and/or its affiliates.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License, version 2.0,
-- as published by the Free Software Foundation.
--
-- This program is also distributed with certain software (including
-- but not limited to OpenSSL) that is licensed under separate terms,
-- as designated in a particular file or component or in included license
-- documentation.  The authors of MySQL hereby grant you an additional
-- permission to link the program and your derivative works with the
-- separately licensed software that they have included with MySQL.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License, version 2.0, for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

DROP FUNCTION IF EXISTS format_bytes;

DELIMITER $$

CREATE DEFINER='mysql.sys'@'localhost' FUNCTION format_bytes (
        -- We feed in and return TEXT here, as aggregates of
        -- bytes can return numbers larger than BIGINT UNSIGNED
        bytes TEXT
    )
    RETURNS TEXT
    COMMENT '
Description
-----------

Takes a raw bytes value, and converts it to a human readable format.

Parameters
-----------

bytes (TEXT):
  A raw bytes value.

Returns
-----------

TEXT

Example
-----------

mysql> SELECT sys.format_bytes(2348723492723746) AS size;
+----------+
| size     |
+----------+
| 2.09 PiB |
+----------+
1 row in set (0.00 sec)

mysql> SELECT sys.format_bytes(2348723492723) AS size;
+----------+
| size     |
+----------+
| 2.14 TiB |
+----------+
1 row in set (0.00 sec)

mysql> SELECT sys.format_bytes(23487234) AS size;
+-----------+
| size      |
+-----------+
| 22.40 MiB |
+-----------+
1 row in set (0.00 sec)
'
    SQL SECURITY INVOKER
    DETERMINISTIC
    NO SQL
BEGIN
  IF bytes IS NULL THEN RETURN NULL;
  ELSEIF bytes >= 1125899906842624 THEN RETURN CONCAT(ROUND(bytes / 1125899906842624, 2), ' PiB');
  ELSEIF bytes >= 1099511627776 THEN RETURN CONCAT(ROUND(bytes / 1099511627776, 2), ' TiB');
  ELSEIF bytes >= 1073741824 THEN RETURN CONCAT(ROUND(bytes / 1073741824, 2), ' GiB');
  ELSEIF bytes >= 1048576 THEN RETURN CONCAT(ROUND(bytes / 1048576, 2), ' MiB');
  ELSEIF bytes >= 1024 THEN RETURN CONCAT(ROUND(bytes / 1024, 2), ' KiB');
  ELSE RETURN CONCAT(ROUND(bytes, 0), ' bytes');
  END IF;
END$$

DELIMITER ;