@echo off
setlocal EnableDelayedExpansion
title Campus - roll back the last fast deploy

REM ============================================================================
REM  Puts back the assembly UploadUpdate.bat replaced (CampusServer.dll.prev).
REM  One deep - it undoes the most recent fast deploy, not a chain of them.
REM ============================================================================

set "ROOT=%~dp0"
set "VPS=root@50.114.179.17"
set "REMOTE=/opt/campus"

if not exist "%ROOT%Password.txt" (echo  [x] Cannot find %ROOT%Password.txt & goto :fail)
set "PW="
for /f "usebackq delims=" %%p in ("%ROOT%Password.txt") do if not defined PW set "PW=%%p"
if not defined PW (echo  [x] Password.txt is empty. & goto :fail)

echo.
echo  Rolling %VPS% back to the previous CampusServer.dll ...
echo.

plink -batch -pw %PW% %VPS% "set -e; test -f %REMOTE%/CampusServer.dll.prev || { echo 'No CampusServer.dll.prev - nothing to roll back to.'; exit 1; }; systemctl stop campus; mv %REMOTE%/CampusServer.dll %REMOTE%/CampusServer.dll.rolledback; mv %REMOTE%/CampusServer.dll.prev %REMOTE%/CampusServer.dll; systemctl start campus; sleep 12; systemctl is-active --quiet campus || { echo 'SERVICE IS NOT RUNNING'; journalctl -u campus -n 30 --no-pager; exit 1; }; journalctl -u campus --since '-2min' --no-pager | grep -E 'Now listening' | tail -3"
if errorlevel 1 (echo. & echo  [x] Rollback FAILED. & goto :fail)

echo.
echo  === ROLLED BACK ============================================================
echo.
echo  The assembly that was live is kept as CampusServer.dll.rolledback.
echo.
endlocal
exit /b 0

:fail
echo.
echo  === FAILED =================================================================
echo.
endlocal
exit /b 1