#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     makeMETIS
#
# Description
#     Build script for METIS
#
# ----------------------------------------------
# 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%/}" # <- METIS_ARCH_PATH
    if [ -d "$dir/include" ]
    then
        for lib in \
            $FOAM_EXT_LIBBIN/libmetis$EXT_SO \
            $dir/lib/libmetis.a \
            $dir/lib/libmetis$EXT_SO \
            $dir/lib$WM_COMPILER_LIB_ARCH/libmetis.a \
            $dir/lib$WM_COMPILER_LIB_ARCH/libmetis$EXT_SO \
            ;
        do
            if [ -r "$lib" ]
            then
                echo "    metis include: $dir/include"
                echo "    metis 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 metis

metisPACKAGE=${METIS_VERSION:-metis-system}
targetType=libso

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

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

* build METIS with
      ${metisPACKAGE:-'unspecified metis 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"
        ;;

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

[ -n "$metisPACKAGE" ] || die "The metis-VERSION was not specified"

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

#------------------------------------------------------------------------------
#
# Build METIS
#
#   METIS_ARCH_PATH  : installation directory
#   METIS_SOURCE_DIR : location of the original sources

METIS_SOURCE_DIR=$sourceBASE/$metisPACKAGE
: "${METIS_ARCH_PATH:=$installBASE$WM_SIZE_OPTIONS/$metisPACKAGE}"

[ -d "$METIS_SOURCE_DIR" ] || {
    echo "Missing sources: '$metisPACKAGE'"
    showDownloadHint METIS
    exit 2
}

#
# Manual installation (of library)
#
install()
{
    local libdir=$METIS_ARCH_PATH/lib

    if [ "$targetType" = libso ]
    then
        \mv $libdir/libmetis$EXT_SO $FOAM_EXT_LIBBIN
        rmdir $libdir 2>/dev/null # Failed rmdir is uncritical

        echo "Installing: $FOAM_EXT_LIBBIN/libmetis$EXT_SO"
    fi
    return 0
}

echo "Starting build: $metisPACKAGE ($targetType)"
echo
(
    # Configuration options:
    unset configOpt
    if [ "$targetType" = libso ]
    then
        configOpt="shared=1"
    fi

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

    rm -rf $METIS_ARCH_PATH
    rm -f $FOAM_EXT_LIBBIN/libmetis$EXT_SO

    # Adjust metis integer size to match OpenFOAM label-size
    sed -i -e 's=\(#define IDXTYPEWIDTH\).*=\1 '$WM_LABEL_SIZE'=' \
        include/metis.h

    # No config option for the library location.
    # - build normally and use mv to relocate it

    make config $configOpt prefix=$METIS_ARCH_PATH \
    && make -j $WM_NCOMPPROCS install \
    && echo "Built: metis" \
    && install
) || {
    echo "Error building: metis"
    exit 1
}


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