#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2018-2019 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     makePETSC
#
# Description
#     Build script for PETSC
#
# ----------------------------------------------
# NO USER-CONFIGURABLE SETTINGS WITHIN THIS FILE
#------------------------------------------------------------------------------
# Dynamic library ending (default is .so)
[ "$(uname -s)" = Darwin ] && EXT_SO=.dylib || EXT_SO=.so

# Short-circuit test for an installation
if [ "$1" = "-test" ]
then
    [ "$#" -eq 2 ] || { echo "${0##*/} -test : needs 1 argument"; exit 1; }
    dir="${2%/}" # <- PETSC_ARCH_PATH
    if [ -d "$dir/include" ]
    then
        for lib in \
            $FOAM_EXT_LIBBIN/libpetsc$EXT_SO \
            $dir/lib/libpetsc.a \
            $dir/lib/libpetsc$EXT_SO \
            $dir/lib$WM_COMPILER_LIB_ARCH/libpetsc.a \
            $dir/lib$WM_COMPILER_LIB_ARCH/libpetsc$EXT_SO \
            ;
        do
            if [ -r "$lib" ]
            then
                echo "    petsc include: $dir/include"
                echo "    petsc library: ${lib%/*}"
                exit 0
            fi
        done
    fi
    exit 2
fi
#------------------------------------------------------------------------------
# Run from third-party directory only
cd ${0%/*} && wmakeCheckPwd "$WM_THIRD_PARTY_DIR" 2>/dev/null || {
    echo "Error (${0##*/}) : not located in \$WM_THIRD_PARTY_DIR"
    echo "    Check your OpenFOAM environment and installation"
    exit 1
}
[ -n "$FOAM_EXT_LIBBIN" ] || {
    echo "Error (${0##*/}) : \$FOAM_EXT_LIBBIN not set"
    echo "    Check your OpenFOAM environment and installation"
    exit 1
}
. etc/tools/ThirdPartyFunctions
#------------------------------------------------------------------------------
_foamConfig petsc

petscPACKAGE=${petsc_version:-petsc-system}
targetType=libso

#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

usage: ${0##*/} [OPTION] [lib|libso] [PETSC-VERSION]
options:
  -gcc          Force use of gcc/g++
  -help

* build PETSC with
      ${petscPACKAGE:-'unspecified petsc version'}

USAGE
    exit 1
}
#------------------------------------------------------------------------------
exportCompiler          # Compiler info for CMake/configure

# Parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    '') ;;      # Ignore empty
    -h | -help) usage   ;;
    -gcc)       useGcc  ;;

    lib|libso)
        targetType="$1"
        ;;

    petsc-[0-9]*)
        petscPACKAGE="${1%%/}"
        unset PETSC_ARCH_PATH  # Avoid inconsistency
        ;;
    *)
        die "unknown option/argument: '$1'"
        ;;
    esac
    shift
done

[ -n "$petscPACKAGE" ] || die "The petsc-VERSION was not specified"

# Nothing to build
if _foamIsNone $petscPACKAGE
then
    echo "Using petsc-none (skip ThirdParty build of PETSC)"
    exit 0
elif _foamIsSystem $petscPACKAGE
then
    echo "Using petsc-system"
    exit 0
fi

#------------------------------------------------------------------------------
#
# Build PETSC
#
#   PETSC_ARCH_PATH  : installation directory
#   PETSC_SOURCE_DIR : location of the original sources

PETSC_SOURCE_DIR=$sourceBASE/$petscPACKAGE
: "${PETSC_ARCH_PATH:=$installBASE$WM_SIZE_OPTIONS/$petscPACKAGE}"

[ -d "$PETSC_SOURCE_DIR" ] || {
    echo "Missing sources: '$petscPACKAGE'"
    showDownloadHint PETSC
    exit 2
}


echo "Starting build: $petscPACKAGE ($targetType)"
echo
(
    # PETSC arch - same root as WM_OPTIONS (eg, DPInt32)
    archOpt="$WM_SIZE_OPTIONS"

    # Configuration options:
    configOpt="--with-cc=$(whichMpicc) --with-cxx=$(whichMpicxx)"

    if [ "$targetType" = libso ]
    then
        configOpt="--with-shared-libraries"
    fi

    if [ "$WM_LABEL_SIZE" = 64 ]
    then
        configOpt="$configOpt --with-64-bit-indices=1"
    else
        configOpt="$configOpt --with-64-bit-indices=0"
    fi

    if [ "$WM_PRECISION_OPTION" = SP ]
    then
        configOpt="$configOpt --with-precision=single"
    else
        configOpt="$configOpt --with-precision=double"
    fi

    cd $PETSC_SOURCE_DIR || exit 1
    export GIT_DIR=$PWD/.git # Mask seeing our own git-repo

    rm -rf $PETSC_ARCH_PATH

    ./configure \
       --prefix=$PETSC_ARCH_PATH \
       --with-petsc-arch=$archOpt \
       --with-clanguage=C \
       --with-scalapack=0 \
       --with-superlu_dist=0 \
       --with-suitesparse=0 \
       --download-f2cblaslapack=1 \
       $configOpt \
     && echo "Configured: petsc" \
     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH="$archOpt" all \
     && echo "Built: petsc" \
     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH="$archOpt" install
     && echo "Installed: petsc"
) || {
    echo "Error building: petsc"
    exit 1
}


#------------------------------------------------------------------------------