Name:           openfoam
Version:        13
Release:        1%{?dist}
Summary:        Open source CFD (Computational Fluid Dynamics) toolbox

License:        GPL-3.0-or-later
URL:            https://openfoam.org/
Source0:        https://github.com/OpenFOAM/OpenFOAM-%{version}/archive/refs/tags/version-%{version}.tar.gz#/OpenFOAM-%{version}.tar.gz
Source1:        https://github.com/OpenFOAM/ThirdParty-%{version}/archive/refs/tags/version-%{version}.tar.gz#/ThirdParty-%{version}.tar.gz

BuildRequires:  gcc-c++
BuildRequires:  cmake
BuildRequires:  flex
BuildRequires:  zlib-devel
BuildRequires:  openmpi-devel
BuildRequires:  boost-devel
BuildRequires:  CGAL-devel
BuildRequires:  fftw-devel
BuildRequires:  scotch-devel
BuildRequires:  metis-devel
BuildRequires:  readline-devel
BuildRequires:  ncurses-devel
BuildRequires:  gmp-devel
BuildRequires:  mpfr-devel
BuildRequires:  python3-devel
BuildRequires:  perl

Requires:       openmpi
Requires:       environment-modules

# Filter private libraries
%global __provides_exclude_from ^%{_libdir}/openfoam/.*\\.so.*$
%global __requires_exclude ^(libOpenFOAM|libfiniteVolume|libmeshTools|libtriSurface|libfileFormats|libgenericPatchFields|liblagrangian|libconversion|libsampling|libsurfMesh).*\\.so.*$

%description
OpenFOAM is a free, open source CFD software package developed by
OpenFOAM Foundation. It has a large user base across most areas of
engineering and science, from both commercial and academic organisations.
OpenFOAM has an extensive range of features to solve anything from complex
fluid flows involving chemical reactions, turbulence and heat transfer,
to solid dynamics and electromagnetics.

%prep
# Extract in parent directory without auto-cd
cd %{_builddir}
rm -rf OpenFOAM-%{version} ThirdParty-%{version}
tar -xzf %{SOURCE0}
tar -xzf %{SOURCE1}
# Rename to expected names
mv OpenFOAM-%{version}-version-%{version} OpenFOAM-%{version}
mv ThirdParty-%{version}-version-%{version} ThirdParty-%{version}
cd OpenFOAM-%{version}

%build
# Change to the renamed directory
cd %{_builddir}/OpenFOAM-%{version}

# Source OpenFOAM environment
export FOAM_INST_DIR=$(cd .. && pwd)
export WM_PROJECT_DIR=$(pwd)

# Don't modify etc/bashrc yet - we need to source it first for the build
# We'll configure the installed version in %install

# Set compiler flags
export FOAM_EXTRA_CFLAGS="%{optflags}"
export FOAM_EXTRA_CXXFLAGS="%{optflags}"

# Set number of build processes
export WM_NCOMPPROCS="%{?_smp_mflags}"

# Load MPI module
%_openmpi_load

# Ensure MPI paths are available for ThirdParty builds
export MPI_ROOT=/usr/lib64/openmpi
export MPI_ARCH_PATH=$MPI_ROOT
# Set CPPFLAGS and LDFLAGS so ThirdParty configure scripts can find MPI
export CPPFLAGS="-I/usr/include/openmpi-x86_64 $CPPFLAGS"
# OpenMPI libraries are in /usr/lib64/openmpi/lib (not lib64)
export LDFLAGS="-L/usr/lib64/openmpi/lib $LDFLAGS"
export LD_LIBRARY_PATH="/usr/lib64/openmpi/lib:$LD_LIBRARY_PATH"
# Explicitly tell configure where MPI libs are to prevent it from guessing lib64
export MPI_LIBS="-L/usr/lib64/openmpi/lib -lmpi"
export MPI_LIBDIR="/usr/lib64/openmpi/lib"

# Disable scotch and ptscotch - scotch 6.0.9 has compilation errors with GCC 14
# We'll use zoltan (parallel) + metis (system) for decomposition instead
export SCOTCH_TYPE=none
export PTSCOTCH_TYPE=none

# Source the environment (ignore return code from bashrc's function context issues)
source etc/bashrc || true

# After sourcing, use ThirdParty zoltan and system METIS for decomposition
export METIS_TYPE=system
export PARMETIS_TYPE=none

# OLD APPROACH - disabled decomposition libraries entirely:
# export SCOTCH_TYPE=none
# export PTSCOTCH_TYPE=none
# export ZOLTAN_TYPE=none
# export METIS_TYPE=system
# export PARMETIS_TYPE=none

# Build OpenFOAM (use verbose mode to see what's happening)
./Allwmake -j 2>&1 | tee build.log
# Check if build succeeded
if [ "${PIPESTATUS[0]}" -ne 0 ]; then
    echo "Build failed!"
    exit 1
fi

%_openmpi_unload

%install
# Change to the build directory
cd %{_builddir}/OpenFOAM-%{version}

# Create installation directory
install -dm 0755 %{buildroot}%{_libdir}/openfoam-%{version}

# Copy the built files
cp -a platforms %{buildroot}%{_libdir}/openfoam-%{version}/
cp -a etc %{buildroot}%{_libdir}/openfoam-%{version}/
cp -a bin %{buildroot}%{_libdir}/openfoam-%{version}/
cp -a applications %{buildroot}%{_libdir}/openfoam-%{version}/
cp -a tutorials %{buildroot}%{_libdir}/openfoam-%{version}/

# Now configure the installed bashrc for system installation
sed -i "s|WM_PROJECT_INST_DIR=\$FOAM_INST_DIR|WM_PROJECT_INST_DIR=%{_libdir}|" %{buildroot}%{_libdir}/openfoam-%{version}/etc/bashrc
sed -i "s|export WM_PROJECT_USER_DIR=.*|export WM_PROJECT_USER_DIR=\$HOME/OpenFOAM/\$USER-\$WM_PROJECT_VERSION|" %{buildroot}%{_libdir}/openfoam-%{version}/etc/bashrc

# Create environment module file
install -dm 0755 %{buildroot}%{_datadir}/modulefiles/openfoam
cat > %{buildroot}%{_datadir}/modulefiles/openfoam/%{version} <<'EOF'
#%%Module1.0
proc ModulesHelp { } {
    puts stderr "OpenFOAM %{version} - CFD Toolbox"
}

module-whatis "OpenFOAM %{version} - Open source CFD toolbox"

module load mpi/openmpi-%{_arch}

setenv FOAM_INST_DIR %{_libdir}
setenv WM_PROJECT_DIR %{_libdir}/openfoam-%{version}
setenv WM_PROJECT OpenFOAM
setenv WM_PROJECT_VERSION %{version}

prepend-path PATH %{_libdir}/openfoam-%{version}/platforms/linux64GccDPInt32Opt/bin
prepend-path LD_LIBRARY_PATH %{_libdir}/openfoam-%{version}/platforms/linux64GccDPInt32Opt/lib
EOF

# Create wrapper script
install -dm 0755 %{buildroot}%{_sysconfdir}/profile.d
cat > %{buildroot}%{_sysconfdir}/profile.d/openfoam-%{version}.sh <<'EOF'
#!/bin/bash
# OpenFOAM %{version} environment setup
export FOAM_INST_DIR=%{_libdir}
export WM_PROJECT_DIR=%{_libdir}/openfoam-%{version}

if [ -f $WM_PROJECT_DIR/etc/bashrc ]; then
    source $WM_PROJECT_DIR/etc/bashrc
fi
EOF

%files
%doc README.md
%license COPYING
%config(noreplace) %{_sysconfdir}/profile.d/openfoam-%{version}.sh
%{_libdir}/openfoam-%{version}/
%{_datadir}/modulefiles/openfoam/%{version}

%changelog
* Mon Oct 27 2025 Your Name <your.email@example.com> - 13-1
- Initial OpenFOAM 13 package for COPR