@echo off
setlocal

rem Usage:
rem   build_windows.bat C:\Qt\6.6.0\mingw_64 C:\opencv\build
rem   build_windows.bat C:\Qt\6.6.0\msvc2019_64 C:\opencv\build\x64\vc16\lib "Visual Studio 17 2022"

if "%~1"=="" (
    echo Usage: %~nx0 ^<QtDir^> ^<OpenCV_DIR^> [CMakeGenerator]
    echo Example MinGW: %~nx0 C:\Qt\6.6.0\mingw_64 C:\opencv\build "MinGW Makefiles"
    echo Example MSVC : %~nx0 C:\Qt\6.6.0\msvc2019_64 C:\opencv\build\x64\vc16\lib "Visual Studio 17 2022"
    exit /b 1
)

if "%~2"=="" (
    echo Missing OpenCV_DIR.
    exit /b 1
)

set QT_DIR=%~1
set OPENCV_DIR=%~2
set GENERATOR=%~3

if "%GENERATOR%"=="" (
    set GENERATOR=MinGW Makefiles
)

if not exist build-windows (
    mkdir build-windows
)

cmake -S . -B build-windows -G "%GENERATOR%" -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="%QT_DIR%" -DOpenCV_DIR="%OPENCV_DIR%"
if errorlevel 1 exit /b %errorlevel%

cmake --build build-windows --config Release
if errorlevel 1 exit /b %errorlevel%

echo.
echo Build finished.
echo If the exe cannot start because DLLs are missing, run:
echo   "%QT_DIR%\bin\windeployqt.exe" build-windows\QtOpenCVImageTool.exe
echo Then copy OpenCV runtime DLLs to the exe directory.