#----------------------------------*-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
#     have_mgridgen
#
# Description
#     Detection/setup of mgridgen
#
# Requires
#     config.sh/mgridgen
#
# Functions provided
#     have_mgridgen, no_mgridgen, echo_mgridgen
#
# Variables set on success
#     HAVE_MGRIDGEN
#     MGRIDGEN_ARCH_PATH
#     MGRIDGEN_INC_DIR
#     MGRIDGEN_LIB_DIR
#
#------------------------------------------------------------------------------
. $WM_PROJECT_DIR/wmake/scripts/sysFunctions # General system functions

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

# Reset variables
no_mgridgen()
{
    unset HAVE_MGRIDGEN MGRIDGEN_ARCH_PATH MGRIDGEN_INC_DIR MGRIDGEN_LIB_DIR
    unset MGRIDGEN_VERSION
    return 0
}


# Report
echo_mgridgen()
{
    echo "mgridgen=${HAVE_MGRIDGEN:-false}"
    echo "root=$MGRIDGEN_ARCH_PATH"
    echo "include=$MGRIDGEN_INC_DIR"
    echo "library=$MGRIDGEN_LIB_DIR"
}


# On success, return 0 and export variables
# -> HAVE_MGRIDGEN, MGRIDGEN_ARCH_PATH, MGRIDGEN_INC_DIR, MGRIDGEN_LIB_DIR
have_mgridgen()
{
    local prefix header library static settings warn
    warn="==> skip mgridgen"

    # Setup
    if settings=$($WM_PROJECT_DIR/bin/foamEtcFile config.sh/mgridgen)
    then
        . "$settings"
    else
        #silent# [ -n "$warn" ] && echo "$warn (no config.sh/mgridgen settings)"
        return 2
    fi

    # Location
    prefix="$MGRIDGEN_ARCH_PATH"

    # Header/library names
    header="mgridgen.h"
    library="libMGridGen$extLibso"
    static="libmgrid$extLiba"

    # ----------------------------------
    if isNone "$prefix"
    then
        #silent# [ -n "$warn" ] && echo "$warn (disabled)"
        return 1
    elif hasAbsdir "$prefix"
    then
        header=$(findFirstFile "$prefix/include/$header")

        library=$(findFirstFile \
            "$(thirdExtLib $library)" \
            "$prefix/lib/$static" \
            "$prefix/lib/$library" \
            "$prefix/lib$WM_COMPILER_LIB_ARCH/$static" \
            "$prefix/lib$WM_COMPILER_LIB_ARCH/$library" \
        )
    elif isSystem "$prefix"
    then
        prefix=/usr
        header=$(findFirstFile "/usr/local/include/$header" "/usr/include/$header")
        case "$header" in (/usr/local/*) prefix=/usr/local ;; esac

        library=$(findFirstFile \
            "$prefix/lib/$library" \
            "$prefix/lib$WM_COMPILER_LIB_ARCH/$library" \
        )
    else
        unset prefix header library
    fi
    # ----------------------------------

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

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

    local good label scalar

    # Ensure consistent sizes with OpenFOAM and mgridgen header
    # Extract typedef for idxtype, realtype
    label=$(sed -ne \
        's/^.*typedef *\([^ ]*\) *idxtype.*/\1/ip' \
        "$header")
    scalar=$(sed -ne \
        's/^.*typedef *\([^ ]*\) *realtype.*/\1/ip' \
        "$header")

    : "${label:=unknown}"
    : "${scalar:=unknown}"

    case "$WM_LABEL_SIZE:$label" in
    (32:int32_t | 32:int | 64:int64_t | 64:long)
        good=true
        ;;

    (*)
        if [ -n "$warn" ]
        then
            echo "$warn (label='$WM_LABEL_SIZE', ${header##*/} has '$label')"
        fi
        no_mgridgen
        return 1
        ;;
    esac
    case "$WM_PRECISION_OPTION:$scalar" in
    (SP:float | DP:double)
        good=true
        ;;

    (*)
        if [ -n "$warn" ]
        then
            echo "$warn (scalar='$WM_PRECISION_OPTION', ${header##*/} has '$scalar')"
        fi
        no_mgridgen
        return 1
        ;;
    esac

    # OK
    echo "mgridgen (label=$label, scalar=$scalar) - $prefix"
    export HAVE_MGRIDGEN=true
    export MGRIDGEN_ARCH_PATH="$prefix"
    export MGRIDGEN_INC_DIR="${header%/*}"     # Basename
    export MGRIDGEN_LIB_DIR="${library%/*}"    # Basename
    export MGRIDGEN_VERSION
}


# Force reset of old variables
no_mgridgen

# Testing
if [ "$1" = "-test" ]
then
    have_mgridgen
    echo_mgridgen
fi

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