#/bin/bash
set -eu
REMOVEPERL=${REMOVEPERL:-0}
PORTDIR="/usr/portage"
DISTDIR="${PORTDIR}/distfiles"
PORTAGE_TMPDIR="/var/tmp"

if [[ $# -ne 2 ]] ; then
	echo "Two arguments are required."
	echo ""
	echo "arg 1: TARGETVER"
	echo "arg 2: TARGETMODE, Please set kernel, freebsd_userland, world."
	exit 1
else
	TARGETVER=$1
	TARGETMODE=$2
fi

set_profile(){
	echo "Setting the ${TARGETVER} profile..."

	emerge --info | head -n 1 | grep clang &>/dev/null && :
	if [[ $? -eq 0 ]] ; then
		eselect profile set $(eselect profile list | grep "${TARGETVER}" | grep clang | awk '{print $1}' | sed 's:\[::g' | sed 's:\]::g' | tail -n 1)
		export CXX="clang++ -stdlib=libc++"
	else
		eselect profile set $(eselect profile list | grep "${TARGETVER}" | grep -v clang | awk '{print $1}' | sed 's:\[::g' | sed 's:\]::g' | tail -n 1)
	fi
}

move_makeconf(){
	[[ ! -e /etc/portage ]] && mkdir -p /etc/portage
	if [[ -e /etc/make.conf ]] && [[ ! -e /etc/portage/make.conf ]] ; then
		echo "Moving the /etc/make.conf to /etc/portage..."
		mv /etc/make.conf /etc/portage
	fi
	gsed -i '/LDFLAGS=/d' /etc/portage/make.conf
	if [[ -e /etc/make.profile ]] && [[ ! -e /etc/portage/make.profile ]] ; then
		echo "Creating the make.profile..."
		ln -s ../..${PORTDIR}profiles/$(eselect profile list | grep '*' | awk '{print $2}') /etc/portage/make.profile
	fi
}

update_portage(){
	local dl_portage_ver="2.3.6"

	echo "Updating the sys-apps/portage with a manual method..."

	cd /tmp
	if [[ -e "${DISTDIR}"/portage-${dl_portage_ver}.tar.bz2 ]] ; then
		cp -a "${DISTDIR}/portage-${dl_portage_ver}.tar.bz2" .
	else
		wget -q "http://dev.gentoo.org/~dolsen/releases/portage/portage-${dl_portage_ver}.tar.bz2"
	fi

	tar xjf "portage-${dl_portage_ver}.tar.bz2"

	cd "/tmp/portage-${dl_portage_ver}"
	PYTHON_TARGETS="python2_7" bin/emerge --nodeps dev-lang/python-exec
	eselect python set 1
	PYTHON_TARGETS="python2_7" bin/emerge --nodeps sys-apps/portage --exclude sys-freebsd/*

	eselect python set 1
}

update_bmake_command(){
	echo "Updating bmake..."

	[[ -e /usr/local/bin/make ]] && exit 1

	cd "${PORTDIR}/sys-freebsd/freebsd-ubin" && ebuild $(ls -1 freebsd-ubin-${TARGETVER}*.ebuild | tail -n 1) prepare
	cd "${PORTAGE_TMPDIR}"/portage/sys-freebsd/freebsd-ubin-${TARGETVER}*/work/usr.bin/bmake
	make
	cp -a make /usr/local/bin/
	cd "${PORTDIR}/sys-freebsd/freebsd-ubin" && ebuild $(ls -1 freebsd-ubin-${TARGETVER}*.ebuild | tail -n 1) clean

	env-update
	source /etc/profile
}

update_config_command(){
	echo "Updating config..."

	[[ -e /usr/local/sbin/config ]] && exit 1

	cd "${PORTDIR}/sys-freebsd/freebsd-usbin" && ebuild $(ls -1 freebsd-usbin-${TARGETVER}*.ebuild | tail -n 1) prepare
	cd "${PORTAGE_TMPDIR}"/portage/sys-freebsd/freebsd-usbin-${TARGETVER}*/work/usr.sbin/config
	/usr/local/bin/make -m /usr/share/mk/system
	cp -a config /usr/local/sbin/
	cd "${PORTDIR}/sys-freebsd/freebsd-usbin" && ebuild $(ls -1 freebsd-usbin-${TARGETVER}*.ebuild | tail -n 1) clean
}

update_minimal(){
	echo "Updating the minimal packages to upgrade the Gentoo/FreeBSD..."

	emerge -u sys-devel/gcc-config --exclude sys-freebsd/*
	update_bmake_command

	emerge --nodeps sys-freebsd/freebsd-mk-defs
	update_config_command

	emerge -u '<sys-apps/findutils-4.6' --exclude sys-freebsd/*
	emerge sys-devel/libtool --exclude sys-freebsd/*

	# https://bugs.gentoo.org/564168
	USE="-*" emerge --nodeps sys-devel/gettext --exclude sys-freebsd/*
	emerge sys-devel/gettext --exclude sys-freebsd/*

	USE="-acl" emerge -u app-arch/libarchive --exclude sys-freebsd/*
	emerge -u sys-devel/flex sys-devel/patch sys-devel/m4 net-libs/libpcap sys-devel/gettext sys-libs/zlib dev-util/dialog --exclude sys-freebsd/*
	emerge sys-devel/libtool --exclude sys-freebsd/*

	if [[ -e /usr/lib/libc++.so ]] ; then
		if [[ $(uname -p) == amd64 ]] && [[ ! -e /usr/lib32/librt.so ]] ; then
			[[ ! -e /etc/portage/profile ]] && mkdir -p /etc/portage/profile
			echo "sys-libs/libcxx abi_x86_32" >> /etc/portage/profile/package.use.mask
			echo "sys-libs/libcxxrt abi_x86_32" >> /etc/portage/profile/package.use.mask
			USE="internal-glib" emerge -u dev-util/pkgconfig --exclude sys-freebsd/*
			USE="-nls" emerge -u cmake --exclude sys-freebsd/*
			emerge --nodeps '<sys-libs/libcxx-3.9' '<sys-libs/libcxxrt-3.9' --exclude sys-freebsd/*
			[[ -e /etc/portage/profile/package.use.mask ]] && gsed -i '/sys-libs\/libcxx abi_x86_32/d' /etc/portage/profile/package.use.mask
			[[ -e /etc/portage/profile/package.use.mask ]] && gsed -i '/sys-libs\/libcxxrt abi_x86_32/d' /etc/portage/profile/package.use.mask
		fi
	fi
}

update_toolchain(){
	echo "Updating the toolchains..."

	if [[ $(uname -p) == amd64 ]] ; then
		gsed -i "s:CHOST=.*:CHOST=\"x86_64-gentoo-freebsd${TARGETVER}\":g" /etc/portage/make.conf
	else
		gsed -i "s:CHOST=.*:CHOST=\"i686-gentoo-freebsd${TARGETVER}\":g" /etc/portage/make.conf
	fi

	# https://bugs.gentoo.org/629128
	[[ ! -e /etc/portage/package.unmask ]] && mkdir -p /etc/portage/package.unmask
	echo "sys-devel/binutils" > /etc/portage/package.unmask/toolchain-oldversion
	echo "<sys-devel/gcc-7.0" >> /etc/portage/package.unmask/toolchain-oldversion
	emerge -u '<sys-devel/binutils-2.28' --exclude sys-freebsd/*
	emerge -u sys-devel/gcc-config --exclude sys-freebsd/*
	emerge '<sys-devel/gcc-5.0' --exclude sys-freebsd/* --exclude sys-devel/binutils
	gcc-config $(gcc-config -l | grep "${TARGETVER}" | awk '{print $1}' | sed 's:\[::g' | sed 's:\]::g' | tail -n 1)
	env-update
	source /etc/profile
	emerge sys-devel/libtool --exclude sys-freebsd/*
}

update_kernel(){
	echo "Updating the kernel..."

	emerge -C freebsd-sources sys-freebsd/virtio-kmod sys-fs/fuse4bsd && :
	emerge freebsd-sources
}

fix_dependence_issue(){
	echo "" > /var/db/pkg/sys-freebsd/freebsd-lib-*/RDEPEND
	rm /var/db/pkg/sys-freebsd/freebsd-lib-*/*.ebuild
	echo "" > /var/db/pkg/dev-libs/glib-*/RDEPEND
	echo "" > /var/db/pkg/dev-libs/glib-*/DEPEND
	rm /var/db/pkg/dev-libs/glib-*/*.ebuild
	rm /var/db/pkg/sys-freebsd/freebsd-libexec-*/*.ebuild
}

update_freebsd_userland(){
	echo "Updating the FreeBSD userland..."

	# Fixing the dependence issue:
	ls -1 /var/db/pkg/sys-freebsd/freebsd-lib-9.* &>/dev/null && :
	[[ $? -eq 0 ]] && fix_dependence_issue

	[[ -e /usr/share/misc/windrv_stub.c ]] && rm -rf /usr/share/misc/windrv_stub.c

	CC=gcc CXX=g++ CXXFLAGS="-O2 -pipe" USE=build emerge -u freebsd-bin freebsd-lib freebsd-mk-defs freebsd-pam-modules freebsd-sbin freebsd-share freebsd-sources freebsd-ubin freebsd-usbin
	emerge freebsd-share

	if type -P clang &> /dev/null ; then
		emerge dev-util/re2c
		emerge --nodeps '<sys-libs/libcxxrt-3.9' --exclude sys-freebsd/*
		emerge --nodeps '<sys-libs/libcxx-3.9' --exclude sys-freebsd/*
		CMAKE_MAKEFILE_GENERATOR=emake CC=gcc CXX=g++ CXXFLAGS="-O2 -pipe" emerge -u '<sys-devel/llvm-4.0' '<sys-devel/clang-4.0' --exclude sys-freebsd/*
		CMAKE_MAKEFILE_GENERATOR=emake emerge sys-devel/llvm sys-devel/clang sys-libs/libcxxrt sys-libs/libcxx --exclude sys-freebsd/*
	fi

	emerge freebsd-bin freebsd-lib freebsd-mk-defs freebsd-pam-modules freebsd-sbin freebsd-share freebsd-sources freebsd-ubin freebsd-usbin

	[[ -e /usr/local/bin/make ]] && rm /usr/local/bin/make
	[[ -e /usr/local/sbin/config ]] && rm /usr/local/sbin/config
	env-update
	source /etc/profile
}

post_freebsd_userland(){
	echo "Updating the minimal tools..."

	emerge sys-devel/libtool app-admin/eselect
	emerge sys-apps/portage
}

remove_perl(){
	echo "Removing and re-installing the dev-lang/perl..."

	emerge -C dev-lang/perl
	emerge -C dev-perl/* perl-core/* virtual/perl*
	emerge dev-lang/perl
	emerge dev-perl/Text-Unidecode dev-perl/Unicode-EastAsianWidth dev-perl/XML-Parser

	rm -rf "${PORTAGE_TMPDIR}"/portage/dev-perl/libintl-perl*
	cd "${PORTDIR}/dev-perl/libintl-perl" && ebuild $(ls -1 libintl-perl-*.ebuild | tail -n 1) clean prepare
	gsed -i 's:-liconv::g' "${PORTAGE_TMPDIR}"/portage/dev-perl/libintl-perl-*/work/libintl-perl-*/gettext_xs/Makefile.PL
	ebuild $(ls -1 libintl-perl-*.ebuild | tail -n 1) merge clean
}

emerge_world(){
	echo "Updating all packages... It takes a lot of time."

	emerge sys-devel/libtool
	emerge -C dev-lang/python:3.3 && :
	gsed -i '/python3.3/d' /etc/python-exec/python-exec.conf
	USE="internal-glib" emerge -u dev-util/pkgconfig
	emerge dev-libs/libxml2
	emerge dev-libs/libxslt app-arch/libarchive dev-libs/glib
	emerge -u sys-devel/gcc
	emerge -C \<$(emerge -pq --nodeps sys-devel/gcc --exclude sys-freebsd/* | grep ebuild | awk '{print $4}') && :
	gcc-config $(gcc-config -l | grep "${TARGETVER}" | awk '{print $1}' | sed 's:\[::g' | sed 's:\]::g' | tail -n 1)
	source /etc/profile
	if [[ ${REMOVEPERL} -ne 0 ]] ; then
		emerge -e @world --exclude dev-perl/libintl-perl
	else
		emerge -e @world
	fi
	emerge -C dev-lang/python:3.2 && :
	emerge -C '<sys-devel/binutils-2.28.1' && :
	emerge @preserved-rebuild
	emerge dev-perl/libintl-perl
	emerge sys-apps/portage
}

cleanup(){
	emerge sys-devel/libtool app-admin/eselect
	[[ -e /etc/portage/package.unmask/toolchain-oldversion ]] && rm /etc/portage/package.unmask/toolchain-oldversion
	echo "done!"
}

case "${TARGETMODE}" in
	"kernel" )
		set_profile
		move_makeconf
		update_portage
		update_minimal
		update_toolchain
		update_kernel
	;;
	"kernelonly" ) update_kernel ;;
	"freebsd_userland" )
		update_freebsd_userland
		post_freebsd_userland
	;;
	"world" )
		[[ ${REMOVEPERL} -ne 0 ]] && remove_perl
		emerge_world
		cleanup
	;;
	* )
		echo "Please set the argument:"
		echo "kernel, freebsd_userland, world."
		exit 1
	;;
esac