#!/bin/bash
set -eu


# TODO:
# - Add support for,
#	- BLAS_LAPACK
#	- MUMPS
#	- PETSC
# (see configs/4/static/CMakeLists.txt)
#

## Constants
#
VER="4.5.6"

PREFIX="${ISSM_DIR}/externalpackages/gmsh/install" # Set to location where external package should be installed

# Find libgfortran so that we do not have to hardcode it.
#
# Should retrieve a copy of gfortran that is compiled from source before 
# returning one that is installed via package manager.
#
# TODO:
# - Move this to etc/environment.sh
#
LIBGFORTRAN=$(mdfind -onlyin /usr -name libgfortran | egrep -n libgfortran.a | egrep -v i386 | sed "s/[0-9]*://g" | head -1)
LIBGFORTRAN_ROOT=${LIBGFORTRAN%/*}

# Cleanup
rm -rf ${PREFIX} src
mkdir -p ${PREFIX} src

# Download source
$ISSM_DIR/scripts/DownloadExternalPackage.sh "https://issm.ess.uci.edu/files/externalpackages/gmsh-${VER}-source.tgz" "gmsh-${VER}-source.tgz"

# Unpack source
tar -xvzf gmsh-${VER}-source.tgz

# Move source to 'src' directory
mv gmsh-${VER}-source/* src
rm -rf gmsh-${VER}-source

# Configure
#
# NOTE:
# - Option -DENABLE_FLTK=0 is used because we do not need GUI.
# - Option -DENABLE_MPEG_ENCODE=0 is used because we do not need to record MPEG 
#	movies.
# - Option -DENABLE_OCC=0 is used because we do not need CAD kernel and are not 
#	importing STEP/IGES files.
# - Option -DENABLE_TOUCHBAR=0 is used because we do not have GUI, therefore we 
#	do not need to support Apple Touch bar (does not affect compilation on 
#	Linux).
#
cd src
cmake \
	-DCMAKE_INSTALL_PREFIX="${PREFIX}" \
	-DENABLE_BUILD_DYNAMIC=1 \
	-DENABLE_BUILD_SHARED=1 \
	-DENABLE_FLTK=0 \
	-DENABLE_MPEG_ENCODE=0 \
	-DENABLE_MPI=1 \
	-DENABLE_OCC=0 \
	-DENABLE_TOUCHBAR=0 \
	-DBLAS_LAPACK_LIBRARIES="-L${LAPACK_ROOT}/lib -lflapack -L${BLAS_ROOT}/lib -lfblas -L${LIBGFORTRAN_ROOT} -lgfortran" \
	-DMETIS_ROOT="${METIS_ROOT}"

# Compile and install
if [ $# -eq 0 ]; then
	make
	make install
else
	make -j $1
	make -j $1 install
fi

# Make necessary link on RHEL
if [[ -d ${PREFIX}/lib64 && ! -d ${PREFIX}/lib ]]; then
	cd ${PREFIX}
	ln -s ./lib64 ./lib
fi