#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2018-2020 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     have_mgridgen
#
# Description
#     Detection/setup of MGRIDGEN
#
# Requires
#     config.sh/mgridgen
#
# Functions provided
#     have_mgridgen, no_mgridgen, echo_mgridgen, query_mgridgen, search_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
no_mgridgen()
{
    unset HAVE_MGRIDGEN MGRIDGEN_ARCH_PATH MGRIDGEN_INC_DIR MGRIDGEN_LIB_DIR
    unset MGRIDGEN_VERSION
}


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


# Search
# $1 : prefix (*_ARCH_PATH, system, ...)
#
# On success, return 0 and export variables
# -> HAVE_MGRIDGEN, MGRIDGEN_ARCH_PATH, MGRIDGEN_INC_DIR, MGRIDGEN_LIB_DIR
search_mgridgen()
{
    local warn="==> skip mgridgen"
    local incName="mgridgen.h"
    local libName="libMGridGen"
    local libName2="libmgrid"

    local prefix="${1:-system}"
    local header library

    # ----------------------------------
    if isNone "$prefix"
    then
        #silent# [ -n "$warn" ] && echo "$warn (disabled)"
        return 1
    elif hasAbsdir "$prefix"
    then
        header=$(findFirstFile "$prefix/include/$incName")
        library=$(findExtLib "$libName" "$libName2")
    elif isSystem "$prefix"
    then
        header=$(findSystemInclude -name="$incName")
        prefix=$(sysPrefix "$header")
    else
        unset prefix
    fi
    # ----------------------------------

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

    # Library
    [ -n "$library" ] \
    || library=$(findLibrary -prefix="$prefix" -name="$libName") \
    || library=$(findLibrary -prefix="$prefix" -name="$libName2") \
    || {
        #silent# [ -n "$warn" ] && echo "$warn (no library)"
        return 2
    }

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

    local 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)
        ;;

    (*)
        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 | SPDP:float | DP:double)
        ;;

    (*)
        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
}


# Output as per search_* function
have_mgridgen()
{
    local warn="==> skip mgridgen"
    local config="config.sh/mgridgen"
    local file

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

    search_mgridgen "$MGRIDGEN_ARCH_PATH"
}


# Query settings
query_mgridgen()
{
    local config="config.sh/mgridgen"
    local file

    if file="$("$WM_PROJECT_DIR"/bin/foamEtcFile -mode=o "$config")"
    then
        . "$file"
        _process_query mgridgen "$MGRIDGEN_ARCH_PATH"
    else
        echo "(no $config)" 1>&2
        echo "mgridgen=unknown"
    fi
}


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

# Reset
no_mgridgen

# Test/query
case "$1" in
-test)
    have_mgridgen
    echo_mgridgen
    ;;
-query)
    query_mgridgen
    ;;
esac

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