-- Move demo dates forward to the real UTC+8 today.
-- Run this on the morning of a demo when that day is later than
-- settings DEMO.dateAnchor. Safe to run again on the same day.
--
-- Adds the same number of days to:
--   inventory_lot.expiryDate
--   delivery_order.estimatedArrivalDate
--   purchase_order.estimatedArrivalDate
-- Quantities, statuses, and lot numbers stay. Already-expired lots stay expired.
--
-- Does not anonymize. Run scripts/anonymize_demo_copy.sql once first.
-- Only updates when DATABASE() is fpsms_demo and the guards below are ok.
--
-- Workbench: select fpsms_demo, File → Open SQL Script, run the whole file.
-- No DELIMITER / procedure (Workbench File → Run friendly).
--
--   mysql -h127.0.0.1 -P3306 -uroot -p fpsms_demo < scripts/refresh_demo_dates.sql

SET NAMES utf8mb4;
SET SESSION time_zone = '+08:00';
SET SESSION sql_safe_updates = 0;
SET SESSION net_read_timeout = 7200;
SET SESSION net_write_timeout = 7200;
SET SESSION wait_timeout = 28800;

SELECT CASE
  WHEN DATABASE() IS NULL OR DATABASE() <> 'fpsms_demo'
    THEN CONCAT('FAIL: current database is ', IFNULL(DATABASE(), 'NULL'), ' — select fpsms_demo')
  WHEN (SELECT COUNT(*) FROM settings WHERE name = 'DEMO.anonymized.v1') = 0
    THEN 'FAIL: run anonymize_demo_copy.sql first'
  WHEN (SELECT COUNT(*) FROM settings WHERE name = 'DEMO.dateAnchor') <> 1
    THEN 'FAIL: DEMO.dateAnchor must exist exactly once'
  WHEN (
    SELECT STR_TO_DATE(value, '%Y-%m-%d')
    FROM settings
    WHERE name = 'DEMO.dateAnchor'
  ) IS NULL
    THEN 'FAIL: DEMO.dateAnchor is not YYYY-MM-DD'
  ELSE 'ok'
END AS refresh_guard
INTO @refresh_guard;

SET @day_delta = IF(
  @refresh_guard = 'ok',
  (
    SELECT DATEDIFF(CURDATE(), STR_TO_DATE(value, '%Y-%m-%d'))
    FROM settings
    WHERE name = 'DEMO.dateAnchor'
  ),
  NULL
);

START TRANSACTION;

UPDATE inventory_lot
SET expiryDate = DATE_ADD(expiryDate, INTERVAL @day_delta DAY)
WHERE @refresh_guard = 'ok'
  AND @day_delta > 0
  AND expiryDate IS NOT NULL;

UPDATE delivery_order
SET estimatedArrivalDate = DATE_ADD(estimatedArrivalDate, INTERVAL @day_delta DAY)
WHERE @refresh_guard = 'ok'
  AND @day_delta > 0
  AND estimatedArrivalDate IS NOT NULL;

UPDATE purchase_order
SET estimatedArrivalDate = DATE_ADD(estimatedArrivalDate, INTERVAL @day_delta DAY)
WHERE @refresh_guard = 'ok'
  AND @day_delta > 0
  AND estimatedArrivalDate IS NOT NULL;

UPDATE settings
SET value = DATE_FORMAT(CURDATE(), '%Y-%m-%d')
WHERE @refresh_guard = 'ok'
  AND @day_delta > 0
  AND name = 'DEMO.dateAnchor';

COMMIT;

SELECT
  @refresh_guard AS refresh_guard,
  @day_delta AS days_added,
  name,
  value
FROM settings
WHERE name = 'DEMO.dateAnchor';