@echo off
setlocal

set "PROJECT_DIR=%~dp0"
pushd "%PROJECT_DIR%" >nul || (
    echo Failed to switch to project directory: %PROJECT_DIR%
    pause
    exit /b 1
)

set "VENV_DIR=.venv"
set "VENV_PYTHON=%VENV_DIR%\Scripts\python.exe"

rem --- If the venv already exists, just run the app (works fully offline) ---
if exist "%VENV_PYTHON%" goto run

rem --- First run only: create venv and install dependencies (needs internet) ---
echo Virtual environment not found. Creating it (internet required, one time only)...
call :find_python
if errorlevel 1 goto :error

"%PYTHON_EXE%" %PYTHON_ARGS% -m venv "%VENV_DIR%"
if errorlevel 1 goto :error

if exist "requirements.txt" (
    echo Installing dependencies...
    "%VENV_PYTHON%" -m pip install --disable-pip-version-check -r requirements.txt
    if errorlevel 1 (
        echo.
        echo Failed to install dependencies. Check your internet connection and run again.
        rem Remove the half-baked venv so the next run retries cleanly.
        rmdir /s /q "%VENV_DIR%"
        goto :error
    )
) else (
    echo requirements.txt not found. Skipping dependency installation.
)

:run
echo Starting laser_control.gui.main...
"%VENV_PYTHON%" -m laser_control.gui.main
set "EXIT_CODE=%ERRORLEVEL%"

popd >nul
if not "%EXIT_CODE%"=="0" pause
exit /b %EXIT_CODE%

:find_python
where py >nul 2>&1
if not errorlevel 1 (
    set "PYTHON_EXE=py"
    set "PYTHON_ARGS=-3"
    exit /b 0
)

where python >nul 2>&1
if not errorlevel 1 (
    set "PYTHON_EXE=python"
    set "PYTHON_ARGS="
    exit /b 0
)

echo Python 3 was not found. Install Python and try again.
exit /b 1

:error
set "EXIT_CODE=%ERRORLEVEL%"
echo Script failed with exit code %EXIT_CODE%.
popd >nul
pause
exit /b %EXIT_CODE%