#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     have_kahip
#
# Description
#     Detection/setup of KAHIP
#
# Requires
#     config.sh/kahip
#
# Functions provided
#     have_kahip, no_kahip, echo_kahip
#
# Variables set on success
#     HAVE_KAHIP
#     KAHIP_ARCH_PATH
#     KAHIP_INC_DIR
#     KAHIP_LIB_DIR
#
#------------------------------------------------------------------------------
. $WM_PROJECT_DIR/wmake/scripts/sysFunctions # General system functions

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

# Reset variables
no_kahip()
{
    unset HAVE_KAHIP KAHIP_ARCH_PATH KAHIP_INC_DIR KAHIP_LIB_DIR
    unset KAHIP_VERSION
    return 0
}


# Report
echo_kahip()
{
    echo "kahip=${HAVE_KAHIP:-false}"
    echo "root=$KAHIP_ARCH_PATH"
    echo "include=$KAHIP_INC_DIR"
    echo "library=$KAHIP_LIB_DIR"
}


# On success, return 0 and export variables
# -> HAVE_KAHIP, KAHIP_ARCH_PATH, KAHIP_INC_DIR, KAHIP_LIB_DIR
have_kahip()
{
    local header library static label settings warn
    warn="==> skip kahip"

    # Basic setup/checks
    settings=$($WM_PROJECT_DIR/bin/foamEtcFile config.sh/kahip) || {
        [ -n "$warn" ] && echo "$warn (no config.sh/kahip settings)"
        return 1
    }
    . $settings
    if isNone "$KAHIP_ARCH_PATH"
    then
        [ -n "$warn" ] && echo "$warn (not available)"
        return 1
    fi


    # Header/library names
    header="kaHIP_interface.h"
    library="libkahip$extLibso"
    static="libkahip$extLiba"

    if hasAbsdir "$KAHIP_ARCH_PATH"
    then
        header=$(findFirstFile $KAHIP_ARCH_PATH/include/$header)

        library=$(findFirstFile \
            "$(thirdExtLib $library)" \
            $KAHIP_ARCH_PATH/lib/$static \
            $KAHIP_ARCH_PATH/lib/$library \
            $KAHIP_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$static \
            $KAHIP_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$library \
        )
    elif isSystem "$KAHIP_ARCH_PATH"
    then
        header=$(findFirstFile /usr/local/include/$header /usr/include/$header)

        case "$header" in
        /usr/local/*)
            library=$(findFirstFile \
                /usr/local/lib/$library \
                /usr/local/lib$WM_COMPILER_LIB_ARCH/$library \
            )
            ;;

        *)
            library=$(findFirstFile \
                /usr/lib/$library \
                /usr/lib$WM_COMPILER_LIB_ARCH/$library \
            )
            ;;
        esac
    else
        unset header library
    fi


    # Header found?
    [ -n "$header" ] || {
        [ -n "$warn" ] && echo "$warn (no header)"
        return 2
    }

    # Library found?
    [ -n "$library" ] || {
        [ -n "$warn" ] && echo "$warn (missing library)"
        return 2
    }


    # kahip itself is 32-bit int, but our interface itself handles some
    # 64-bit conversion (mesh size).

    echo "kahip (label=32) - $KAHIP_ARCH_PATH"
    export HAVE_KAHIP=true
    export KAHIP_ARCH_PATH
    export KAHIP_INC_DIR="${header%/*}"     # Basename
    export KAHIP_LIB_DIR="${library%/*}"    # Basename
}


# Force reset of old variables
no_kahip

# Testing
if [ "$1" = "-test" ]
then
    have_kahip
    echo_kahip
fi

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