# Packager = Tuxcore <dev@tuxcore.org> 
pkgbase=fftw
pkgname=(fftw fftw-openmpi)
pkgver=3.3.10
pkgrel=7
pkgdesc="A library for computing the discrete Fourier transform (DFT)"
arch=(x86_64)
url="http://www.fftw.org/"
license=(GPL-2.0-or-later)
makedepends=(
  bash
  cmake
  gcc-fortran
  gcc-libs
  glibc
  openmpi
)
source=(http://www.fftw.org/$pkgname-$pkgver.tar.gz)
sha512sums=('2d34b5ccac7b08740dbdacc6ebe451d8a34cf9d9bfec85a5e776e87adf94abfd803c222412d8e10fbaa4ed46f504aa87180396af1b108666cde4314a55610b40')
b2sums=('3663872bd95a01d2c79af185f53918e1d1a9c91c620082402772c07f25b9b77d4920a78dc686fac6b51aa961b8d62b7e2cef3f3031e096bed40ced80b59b29d5')
_build_types=(single double long-double quad)
_soname=3.6.10

_pick() {
  local p="$1" f d; shift
  for f; do
    d="$srcdir/$p/${f#$pkgdir/}"
    mkdir -p "$(dirname "$d")"
    mv "$f" "$d"
    rmdir -p --ignore-fail-on-non-empty "$(dirname "$f")"
  done
}

prepare() {
  local _i

  # fix wrong soname in FFTW3LibraryDepends.cmake
  sed -e "s/3.6.9/$_soname/" -i $pkgname-$pkgver/CMakeLists.txt

  mv -v $pkgname-$pkgver $pkgname-$pkgver-single
  for _i in {1..3}; do
    cp -av $pkgname-$pkgver-single $pkgname-$pkgver-"${_build_types[$_i]}"
  done
}

build() {
  local _name
  local _configure=(
    ./configure
    --prefix=/usr
    --enable-shared
    --enable-threads
    --enable-mpi
    --enable-openmp
    MPILIBS="$(mpicc --showme:link)"
  )
  local _configure_single=(
    --enable-sse
    --enable-avx
    --enable-single
  )
  local _configure_double=(
    --enable-sse2
    --enable-avx
  )
  local _configure_long_double=(
    --enable-long-double
  )
  local _configure_quad=(
    --disable-mpi
    --enable-quad-precision
  )
  local _cmake_options=(
    -B build
    -S $pkgname-$pkgver-$_build_types
    -D CMAKE_INSTALL_PREFIX=/usr
    -D CMAKE_BUILD_TYPE=None
    -D ENABLE_OPENMP=ON
    -D ENABLE_THREADS=ON
    -D ENABLE_FLOAT=ON
    -D ENABLE_LONG_DOUBLE=ON
    -D ENABLE_QUAD_PRECISION=ON
    -D ENABLE_SSE=ON
    -D ENABLE_SSE2=ON
    -D ENABLE_AVX=ON
    -D ENABLE_AVX2=ON
  )

  # create missing FFTW3LibraryDepends.cmake
  # https://bugs.archlinux.org/task/67604
  cmake "${_cmake_options[@]}"
  # fix broken IMPORTED_LOCATION: https://github.com/FFTW/fftw3/issues/130#issuecomment-1030280157
  sed -e 's|\(IMPORTED_LOCATION_NONE\).*|\1 "/usr/lib/libfftw3.so.3"|' -i build/FFTW3LibraryDepends.cmake

  export F77='gfortran'
  # use upstream default CFLAGS while keeping our -march/-mtune
  CFLAGS+=" -O3 -fomit-frame-pointer -malign-double -fstrict-aliasing -ffast-math"

  for _name in "${_build_types[@]}"; do
    (
      cd $pkgname-$pkgver-$_name
      case $_name in
        single)
        "${_configure[@]}" "${_configure_single[@]}"
        ;;
        double)
        "${_configure[@]}" "${_configure_double[@]}"
        ;;
        long-double)
        "${_configure[@]}" "${_configure_long_double[@]}"
        ;;
        quad)
        "${_configure[@]}" "${_configure_quad[@]}"
        ;;
      esac
      # fix overlinking because of libtool
      sed -i -e 's/ -shared / -Wl,-O1,--as-needed\0/g' libtool
    )
  done

  for _name in "${_build_types[@]}"; do
    make -C $pkgname-$pkgver-$_name
  done
}

check() {
  local _name

  for _name in "${_build_types[@]}"; do
    make smallcheck -C $pkgname-$pkgver-$_name/tests
  done
}

package_fftw() {
  depends=(
    bash
    gcc-libs
    glibc
  )
  optdepends=('fftw-openmpi: for OpenMPI integration')
  provides=(
    libfftw3q_threads.so
    libfftw3q_omp.so
    libfftw3q.so
    libfftw3l_threads.so
    libfftw3l_omp.so
    libfftw3l.so
    libfftw3f_threads.so
    libfftw3f_omp.so
    libfftw3f.so
    libfftw3_threads.so
    libfftw3_omp.so
    libfftw3.so
  )

  local _name

  for _name in "${_build_types[@]}"; do
    make DESTDIR="$pkgdir" install -C $pkgname-$pkgver-$_name
  done
  (
    cd "$pkgdir"
    _pick $pkgbase-openmpi usr/include/fftw3-mpi.h
    _pick $pkgbase-openmpi usr/include/fftw3{,l}-mpi.f03
    _pick $pkgbase-openmpi usr/lib/libfftw3{,f,l}_mpi.{a,so}
    _pick $pkgbase-openmpi usr/lib/libfftw3{,f,l}_mpi.so.${_soname%%.*}
    _pick $pkgbase-openmpi usr/lib/libfftw3{,f,l}_mpi.so.$_soname
  )
  install -vDm 644 $pkgname-$pkgver-$_build_types/{AUTHORS,ChangeLog,NEWS,README,TODO} -t "$pkgdir/usr/share/doc/$pkgname"
  # install missing FFTW3LibraryDepends.cmake
  install -vDm 644 build/FFTW3LibraryDepends.cmake -t "$pkgdir/usr/lib/cmake/fftw3/"
}

package_fftw-openmpi() {
  pkgdesc+=" - OpenMPI libraries"
  depends=(
    fftw
    glibc
    openmpi
  )
  provides=(
    libfftw3l_mpi.so
    libfftw3f_mpi.so
    libfftw3_mpi.so
  )

  mv -v $pkgname/* "$pkgdir"
}
