# This is the recipe.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

DOWNLOAD="https://www.fftw.org/fftw-${BPM_PKG_VERSION}.tar.gz"
FILENAME="${DOWNLOAD##*/}"

# The prepare function is executed in the root of the temp directory
# This function is used for downloading files and putting them into the correct location
prepare() {
  wget "$DOWNLOAD"
  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  # Build double precision arithmetic version
  mkdir "$BPM_SOURCE"/double_precision
  cd "$BPM_SOURCE"/double_precision
  ../configure --prefix=/usr --enable-shared --disable-static --enable-threads --enable-sse2 --enable-avx --enable-avx2
  make

  # Build single precision arithmetic version
  mkdir "$BPM_SOURCE"/single_precision
  cd "$BPM_SOURCE"/single_precision
  ../configure --prefix=/usr --enable-shared --disable-static --enable-threads --enable-sse2 --enable-avx --enable-avx2 --enable-float
  make

  # Build long double precision arithmetic version
  mkdir "$BPM_SOURCE"/long_double_precision
  cd "$BPM_SOURCE"/long_double_precision
  ../configure --prefix=/usr --enable-shared --disable-static --enable-threads --enable-long-double
  make
}

# The check function is executed in the source directory
# This function is used to run tests to verify the package has been compiled correctly
check() {
  # Check double precision arithmetic version
  cd "$BPM_SOURCE"/double_precision
  make check

  # Check single precision arithmetic version
  cd "$BPM_SOURCE"/single_precision
  make check

  # Check long double precision arithmetic version
  cd "$BPM_SOURCE"/long_double_precision
  make check
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package() {
  # Package double precision arithmetic version
  cd "$BPM_SOURCE"/double_precision
  make DESTDIR="$BPM_OUTPUT" install

  # Package single precision arithmetic version
  cd "$BPM_SOURCE"/single_precision
  make DESTDIR="$BPM_OUTPUT" install

  # Package long double precision arithmetic version
  cd "$BPM_SOURCE"/long_double_precision
  make DESTDIR="$BPM_OUTPUT" install

  # Install license
  install -Dm644 "$BPM_SOURCE"/COPYING "$BPM_OUTPUT"/usr/share/licenses/fftw/COPYING
}