@echo off
setlocal enabledelayedexpansion
cd /d "%~dp0"

rem Force a UTF-8 console + UTF-8 mode in Python so prints with em-dashes and
rem the like don't crash on machines whose console codepage is cp1252 / cp932.
chcp 65001 >nul 2>nul
set "PYTHONUTF8=1"
set "PYTHONIOENCODING=utf-8"

rem Pick a Python launcher. Try py first (works on most python.org installs),
rem then `python`, then `python3`. enabledelayedexpansion + !ERRORLEVEL! is
rem required so each check reads the value AFTER the preceding `where` runs.
set "PYCMD="

where py >nul 2>nul
if !ERRORLEVEL! EQU 0 set "PYCMD=py"

if not defined PYCMD (
    where python >nul 2>nul
    if !ERRORLEVEL! EQU 0 set "PYCMD=python"
)

if not defined PYCMD (
    where python3 >nul 2>nul
    if !ERRORLEVEL! EQU 0 set "PYCMD=python3"
)

if not defined PYCMD (
    echo [run.bat] No Python found on PATH.
    echo [run.bat] Install Python 3.10+ from https://www.python.org/downloads/
    echo [run.bat] During install, tick "Add Python to PATH".
    pause
    exit /b 1
)

echo [run.bat] Using !PYCMD! to launch app.py.
echo [run.bat] First run creates .venv and installs ~500 MB of packages.
echo [run.bat] That can take several minutes; it only happens once.
echo.

!PYCMD! "%~dp0app.py" %*
set "EXITCODE=!ERRORLEVEL!"

if !EXITCODE! NEQ 0 (
    echo.
    echo [run.bat] app.py exited with code !EXITCODE!.
    pause
)
endlocal & exit /b %EXITCODE%