# Copyright (C) Max Romanov
# Copyright (C) NGINX, Inc.


shift

NXT_GO=go

for nxt_option; do

    case "$nxt_option" in
        -*=*) value=`echo "$nxt_option" | sed -e 's/[-_a-zA-Z0-9]*=//'`     ;;
           *) value="" ;;
    esac

    case "$nxt_option" in
        --go=*)       NXT_GO="$value"                                        ;;
        --go-path=*)  NXT_GO_PATH="$value"                                   ;;

        --help)
            cat << END

    --go=NAME        set go executable
    --go-path=PATH   set GOPATH variable to install package

END
            exit 0
        ;;

        *)
            echo
            echo $0: error: invalid Go option \"$nxt_option\"
            echo
            exit 1
        ;;

    esac

done


if [ ! -f $NXT_AUTOCONF_DATA ]; then
   echo
   echo Please run common $0 before configuring module \"$nxt_module\".
   echo
   exit 1
fi

. $NXT_AUTOCONF_DATA


$echo "configuring Go package"
$echo "configuring Go package ..." >> $NXT_AUTOCONF_ERR

$echo -n "checking for Go ..."
$echo "checking for Go ..." >> $NXT_AUTOCONF_ERR


if /bin/sh -c "${NXT_GO} version" >> $NXT_AUTOCONF_ERR 2>&1; then
    $echo " found"

    NXT_GO_VERSION="`${NXT_GO} version`"
    $echo " + ${NXT_GO_VERSION}"

else
    $echo
    $echo $0: error: no Go found.
    $echo
    exit 1;
fi


NXT_GO_PATH=${NXT_GO_PATH=`${NXT_GO} env GOPATH`}
NXT_GO_PATH=${NXT_GO_PATH:-${PWD}/${NXT_BUILD_DIR}/${NXT_GO}}

NXT_GO_PKG=unit.nginx.org/go

$echo " + Go package path: \"${NXT_GO_PATH}\""

if grep ^$NXT_GO: $NXT_MAKEFILE 2>&1 > /dev/null; then
    $echo
    $echo $0: error: duplicate \"$NXT_GO\" package configured.
    $echo
    exit 1;
fi

NXT_GO_LDFLAGS=

for o in ${CFLAGS} ${NXT_CC_OPT}; do
    case "$o" in
      -fsanitize* | -L* | -l*) NXT_GO_LDFLAGS="${NXT_GO_LDFLAGS} $o" ;;
    esac
done

cat << END >> $NXT_MAKEFILE

.PHONY: ${NXT_GO}
.PHONY: ${NXT_GO}-install
.PHONY: ${NXT_GO}-install-src
.PHONY: ${NXT_GO}-uninstall

GOPATH =	$NXT_GO_PATH
GOOS =		`${NXT_GO} env GOOS`
GOARCH =	`${NXT_GO} env GOARCH`

NXT_GO_DST =	${NXT_GO_PATH%%:*}

install: ${NXT_GO}-install

${NXT_GO}:

${NXT_GO}-install: ${NXT_GO}-install-src ${NXT_GO}-install-env
	GOPATH=\$(DESTDIR)\$(GOPATH) ${NXT_GO} build ${NXT_GO_PKG}

${NXT_GO}-install-src:
	install -d \$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}
	install -p -m644 ./go/* \$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}/

${NXT_GO}-install-env: \$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}/env.go \
    ${NXT_VERSION_H} ${NXT_BUILD_DIR}/${NXT_LIB_UNIT_STATIC}

\$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}/env.go:
	install -d \$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}
	$echo "package unit" > \$@
	$echo "/*" >> \$@
	$echo "#cgo CFLAGS: ${CFLAGS} ${NXT_CC_OPT}" >> \$@
	$echo "#cgo CPPFLAGS: -I${PWD}/src -I${PWD}/${NXT_BUILD_DIR}" >> \$@
	$echo "#cgo LDFLAGS: -L${PWD}/${NXT_BUILD_DIR} ${NXT_GO_LDFLAGS} ${NXT_LD_OPT}" >> \$@
	$echo "*/" >> \$@
	$echo 'import "C"' >> \$@


uninstall: ${NXT_GO}-uninstall

${NXT_GO}-uninstall:
	rm -rf \$(DESTDIR)\$(NXT_GO_DST)/src/${NXT_GO_PKG}
	rm -rf \$(DESTDIR)\$(NXT_GO_DST)/pkg/\$(GOOS)_\$(GOARCH)/${NXT_GO_PKG}

END