@echo off
rem ============================================================
rem  Download URL (notify.exe is fetched from here on first run) -- edit as needed
set "DOWNLOAD_URL=https://git.pchuan.top/cc-tools/notify/releases/download/v1.0.0/notify.exe"
rem ============================================================
setlocal
set "BIN=%~dp0..\bin"
set "EXE=%BIN%\notify.exe"
set "LOCK=%BIN%\notify.download.lock"

rem only bootstrap on first run; the common path runs the exe directly (keeps piped stdin intact)
if not exist "%EXE%" call :bootstrap

if exist "%EXE%" "%EXE%" %*
endlocal
exit /b

:bootstrap
if not exist "%BIN%" mkdir "%BIN%" 2>nul
set "TMP=%BIN%\notify.exe.%RANDOM%.tmp"
rem mkdir is atomic; success = this process downloads, failure = someone else is downloading
mkdir "%LOCK%" 2>nul
if errorlevel 1 goto :waitdl
rem double-check in case it just finished
if exist "%EXE%" ( rmdir "%LOCK%" 2>nul & exit /b )
rem download to temp then atomic rename, so no half-written exe is ever seen
curl -fsSL "%DOWNLOAD_URL%" -o "%TMP%"
if errorlevel 1 ( del "%TMP%" 2>nul & rmdir "%LOCK%" 2>nul & exit /b )
move /y "%TMP%" "%EXE%" >nul
rmdir "%LOCK%" 2>nul
exit /b

:waitdl
rem did not get the lock; wait for the exe to appear (up to ~60s)
set /a _w=0
:waitloop
if exist "%EXE%" exit /b
if %_w% geq 120 (
    rem timed out; a killed download may have left a stale lock, clear it for next time
    rmdir "%LOCK%" 2>nul
    exit /b
)
ping -n 2 127.0.0.1 >nul
set /a _w+=1
goto :waitloop