# Maintainer: otaj <jasek.ota@gmail.com>
# If you want to set only one GPU target compute capability, set _GPU_TARGET,
# otherwise leave it commented out and it will build default targets (35+).
# You can also set multiple targets separated by a semicolon
# If you want the python package to work with MKL, you need to have python-numpy-mkl installed!
# See https://github.com/facebookresearch/faiss/issues/1393

# _GPU_TARGET="native"
_pkgname=faiss
pkgbase=faiss-cuda-git
pkgname=('faiss-cuda-git' 'python-faiss-cuda-git')
arch=('i686' 'x86_64')
url="https://github.com/facebookresearch/faiss"
license=('MIT')
pkgver=v1.7.3.r10.ga996a4a0
pkgrel=1
source=(${_pkgname}::git+https://github.com/facebookresearch/faiss.git)
sha256sums=('SKIP')
depends=('blas' 'lapack' 'cuda' 'openmp')
makedepends=('git' 'python' 'python-numpy' 'swig' 'python-setuptools' 'cmake')
optdepends=('intel-mkl: To use MKL blas implemenetation' 'python-numpy-mkl: To use MKL blas implementation.')
checkdepends=('python-pytest' 'python-scipy')

pkgver() {
  cd "${_pkgname}"
  git describe --long --tags | sed 's/\([^-]*-g\)/r\1/;s/-/./g'
}


prepare() {
  cd "${srcdir}/${_pkgname}"
  mkdir -p build
  cd build
  _CMAKE_FLAGS="\
    -DFAISS_ENABLE_GPU=ON \
    -DFAISS_ENABLE_PYTHON=ON \
    -DCUDAToolkit_ROOT=/opt/cuda \
    -DCMAKE_BUILD_TYPE=Release \
    -DBUILD_TESTING=ON \
    -DCMAKE_INSTALL_PREFIX=/usr "
  if ! [ -z "$_GPU_TARGET" ]
  then
    _CMAKE_FLAGS=$_CMAKE_FLAGS"-DCMAKE_CUDA_ARCHITECTURES="$_GPU_TARGET""
  else
    _CMAKE_FLAGS=$_CMAKE_FLAGS"-DCMAKE_CUDA_ARCHITECTURES=35;37;50;52;60;61;70;75;80;86;87;89;90"
  fi
  # echo $_CMAKE_FLAGS
  CC=/usr/bin/gcc-11 CXX=/usr/bin/g++-11 CUDAHOSTCXX=/usr/bin/g++-11 cmake $_CMAKE_FLAGS ..
}

check() {
  cd "${srcdir}/${_pkgname}/build"
  make test
  PYTHONPATH="${srcdir}/${_pkgname}/build/${_pkgname}/python" python -c "import faiss; import faiss.contrib"
  cd "${srcdir}/${_pkgname}/tests"
  PYTHONPATH="${srcdir}/${_pkgname}/build/${_pkgname}/python" pytest  
}



build() {
  cd "${srcdir}/${_pkgname}/build"
  make
  cd faiss/python
  python setup.py build
}

package_faiss-cuda-git() {
  pkgdesc='A library for efficient similarity search and clustering of dense vectors, CUDA version.'
  provides=('faiss')
  conflicts=('faiss')
  cd "${srcdir}/${_pkgname}/build"
  make DESTDIR="$pkgdir" install
  cd ..
  install -Dm 644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
}

package_python-faiss-cuda-git() {
  pkgdesc='A library for efficient similarity search and clustering of dense vectors, CUDA version. Python wrappers'
  provides=('python-faiss')
  conflicts=('python-faiss')
  depends=('python' 'python-numpy')

  cd "${srcdir}/${_pkgname}/build/faiss/python"
  python setup.py install --root="$pkgdir/" --optimize=1 --skip-build
  cd ../../..
  install -Dm 644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
}