#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2020 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     have_libz
#
# Description
#     Detection/setup of LIBZ (zlib)
#
# Requires
#     None
#
# Functions provided
#     have_libz, no_libz, echo_libz, search_libz
#
# Variables set on success
#     HAVE_LIBZ - as per GNU autoconf
#     LIBZ_INC_DIR
#     LIBZ_LIB_DIR
#
#------------------------------------------------------------------------------
. ${WM_PROJECT_DIR:?}/wmake/scripts/sysFunctions    # General system functions

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

# Reset
no_libz()
{
    unset HAVE_LIBZ LIBZ_INC_DIR LIBZ_LIB_DIR
}


# Report
echo_libz()
{
    echo "libz=${HAVE_LIBZ:-false}"
    echo "include=\"$LIBZ_INC_DIR\""
    echo "library=\"$LIBZ_LIB_DIR\""
}


# Search
# $1 : prefix (*_ARCH_PATH, system, ...)
#
# On success, return 0 and export variables
# -> HAVE_LIBZ, LIBZ_INC_DIR, LIBZ_LIB_DIR
search_libz()
{
    local warn # warn="==> skip libz"
    local incName="zlib.h"
    local libName="libz"

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

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

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

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

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

    # OK
    export HAVE_LIBZ=true
    export LIBZ_INC_DIR="${header%/*}"     # Basename
    export LIBZ_LIB_DIR="${library%/*}"    # Basename
}


# Output as per search_* function
have_libz()
{
    search_libz system
}


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

# Reset
no_libz

# Test/query
case "$1" in
-test)
    have_libz
    echo_libz
    ;;
esac

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