# Maintainer (lib32): Nocifer <apmichalopoulos at gmail dot com>
# Maintainer: David Runge <dvzrv@archlinux.org>
# Contributor: Ronald van Haren <ronald.archlinux.org>
# Contributor: David Runge <dvzrv@archlinux.org>
# Contributor: damir <damir@archlinux.org>
# Contributor: Adam <adam900710@gmail.com>
# Contributor: GordonGR <ntheo1979@gmail.com>
# Contributor: josephgbr <rafael.f.f1@gmail.com>

_pkgname=fftw
pkgname=lib32-$_pkgname
pkgver=3.3.10
pkgrel=3
pkgdesc='A library for computing the discrete Fourier transform (DFT) (32 bit)'
arch=('x86_64')
url='https://www.fftw.org'
license=('GPL2')
depends=("$_pkgname" 'lib32-gcc-libs')
makedepends=('cmake' 'gcc-fortran')
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')
source=("https://www.fftw.org/$_pkgname-$pkgver.tar.gz")
sha256sums=('56c932549852cddcfafdab3820b0200c7742675be92179e59e6215b340e26467')

_build_types=(single double long-double quad)

prepare() {
  local _i

  # fix wrong soname in FFTW3LibraryDepends.cmake
  sed -e 's/3.6.9/3.6.10/' -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-openmp
    #--enable-mpi
    --libdir=/usr/lib32
  )
  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/lib32/libfftw3.so.3"|' -i build/FFTW3LibraryDepends.cmake

  export F77='gfortran'
  export CC='gcc -m32'
  export CXX='g++ -m32'
  export PKG_CONFIG_PATH='/usr/lib32/pkgconfig'
  # 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
}

package() {
  local _name

  for _name in "${_build_types[@]}"; do
    make DESTDIR="$pkgdir" install -C $_pkgname-$pkgver-$_name
  done
  #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/lib32/cmake/fftw3/"

  rm -rf "${pkgdir}/usr"/{bin,include,share}
}