#!/bin/sh
# Copyright 2017 Roger Shimizu <rogershimizu@gmail.com>
#
# This is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

help_usage() {
cat << EOT

Build shadowsocks-libev and its dependencies
Usage:
	$(basename $0) [--help|-h] [lib|bin|all]

	--help|-h	Show this usage.
	lib		Build library packages only.
	bin		Build binary packages only.
			However, you need the libraries built previously, in current working directory.
			For advanced user only.
	all		Build both binary and library packages (default).
			The safe choice for everyone.

Please run this script in a clean place.
e.g.
	mkdir -p ~/build-area
	cd ~/build-area
	ln -s $(readlink -f $0) .
	./$(basename $0)

EOT
exit
}

help_lib() {
cat << EOT

Failed to install required library:
	$1
You can try to fix it by:

	$0 lib

EOT
exit
}

apt_init() {
	DEPS="$1"
	DEPS_BPO="$2"
	if [ -n "$DEPS_BPO" ]; then
		BPO=${OSVER}-backports
		case "$OSID" in
		debian)
			REPO=http://httpredir.debian.org/debian
			;;
		ubuntu)
			REPO=http://archive.ubuntu.com/ubuntu
			;;
		esac
		sudo sh -c "printf \"deb $REPO ${OSVER}-backports main\" > /etc/apt/sources.list.d/${OSVER}-backports.list"
		sudo apt-get update
		sudo apt-get install -y -t $BPO $DEPS_BPO
	else
		sudo apt-get update
	fi
	sudo apt-get install -y $DEPS
}

# Cleanup
apt_clean() {
	sudo apt-get purge -y $DEPS $DEPS_BPO debhelper \
		libbloom-dev libcork-dev libcorkipset-dev libmbedtls-dev libsodium-dev
	sudo apt-get purge -y libcork-build-deps libcorkipset-build-deps \
		libbloom-build-deps libsodium-build-deps mbedtls-build-deps
	sudo apt-get purge -y simple-obfs-build-deps shadowsocks-libev-build-deps
	sudo apt-get autoremove -y
}

gbp_build() {
	REPO=$1
	BRANCH=$2
	PROJECT_NAME=$(basename $1|sed s/\.git$//)
	gbp clone --pristine-tar $REPO
	cd $PROJECT_NAME
	git checkout $BRANCH
	mk-build-deps --root-cmd sudo --install --tool "apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y"
	rm ${PROJECT_NAME}-build-deps_*.deb
	gbp buildpackage -us -uc --git-ignore-branch --git-pristine-tar
	git clean -fdx
	git reset --hard HEAD
	cd -
}

git_build() {
	REPO=$1
	BRANCH=$2
	PROJECT_NAME=$(basename $1|sed s/\.git$//)
	git clone $REPO
	cd $PROJECT_NAME
	git checkout $BRANCH
	mk-build-deps --root-cmd sudo --install --tool "apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y"
	rm ${PROJECT_NAME}-build-deps_*.deb
	gbp buildpackage -us -uc --git-ignore-branch
	git clean -fdx
	git reset --hard HEAD
	cd -
}

dsc_build() {
	DSC=$1
	DSC_FILE=$(basename $1)
	dget -ux $DSC
	PROJECT_NAME=$(grep ^Source: $DSC_FILE|cut -d" " -f2)
	echo cd ${PROJECT_NAME}-*
	cd ${PROJECT_NAME}-*
	mk-build-deps --root-cmd sudo --install --tool "apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y"
	rm ${PROJECT_NAME}-build-deps_*.deb
	dpkg-buildpackage -us -uc
	cd -
}

# Build and install libcork deb
build_install_libcork() {
	BRANCH=$1
	if [ $BUILD_LIB -eq 1 ]; then
		gbp_build https://github.com/rogers0/libcork $BRANCH
	else
		ls libcork-dev_*.deb libcork16_*.deb 2>&1 > /dev/null ||
			help_lib "libcork-dev libcork16"
	fi
	sudo dpkg -i libcork-dev_*.deb libcork16_*.deb
}

# Build and install libcorkipset deb
build_install_libcorkipset() {
	BRANCH=$1
	if [ $BUILD_LIB -eq 1 ]; then
		gbp_build https://github.com/rogers0/libcorkipset $BRANCH
	else
		ls libcorkipset-dev_*.deb libcorkipset1_*.deb 2>&1 > /dev/null ||
			help_lib "libcorkipset-dev libcorkipset1"
	fi
	sudo dpkg -i libcorkipset-dev_*.deb libcorkipset1_*.deb
}

# Build libmbedtls deb
build_install_libmbedtls() {
	BRANCH=$1
	if [ $BUILD_LIB -eq 1 ]; then
		gbp_build https://anonscm.debian.org/git/collab-maint/mbedtls.git $BRANCH
	else
		ls libmbed*.deb 2>&1 > /dev/null ||
			help_lib libmbedtls
	fi
	sudo dpkg -i libmbed*.deb
}

# Build libsodium deb
build_install_libsodium() {
	if [ $BUILD_LIB -eq 1 ]; then
		dsc_build http://httpredir.debian.org/debian/pool/main/libs/libsodium/libsodium_1.0.11-1~bpo8+1.dsc
	else
		ls libsodium*.deb 2>&1 > /dev/null ||
			help_lib libsodium
	fi
	sudo dpkg -i libsodium*.deb
}

# Build libbloom deb
build_install_libbloom() {
	BRANCH=$1
	if [ $BUILD_LIB -eq 1 ]; then
		gbp_build https://github.com/rogers0/libbloom $BRANCH
	else
		ls libbloom-dev_*.deb libbloom1_*.deb 2>&1 > /dev/null ||
			help_lib "libbloom-dev libbloom1"
	fi
	sudo dpkg -i libbloom-dev_*.deb libbloom1_*.deb
}

# Add patch to work on system with debhelper 9 only
patch_sslibev_dh9() {
if [ $BUILD_BIN -eq 1 ]; then
	BRANCH=$1
	gbp clone --pristine-tar https://anonscm.debian.org/git/collab-maint/shadowsocks-libev.git
	cd shadowsocks-libev
	git checkout $BRANCH
	sed -i 's/dh $@/dh $@ --with systemd,autoreconf/' debian/rules
	sed -i 's/debhelper (>= 10)/debhelper (>= 9), dh-systemd, dh-autoreconf/' debian/control
	echo 9 > debian/compat
	git add -u
	git commit -m "Patch to work with ubuntu trusty (14.04)"
	cd -
fi
}

# Build and install shadowsocks-libev deb
build_install_sslibev() {
if [ $BUILD_BIN -eq 1 ]; then
	BRANCH=$1
	gbp_build https://anonscm.debian.org/git/collab-maint/shadowsocks-libev.git $BRANCH
	sudo dpkg -i shadowsocks-libev_*.deb
	sudo apt-get install -fy
fi
}

# Build and install simple-obfs
build_install_simpleobfs() {
if [ $BUILD_BIN -eq 1 ]; then
	BRANCH=$1
	git_build https://github.com/rogers0/simple-obfs $BRANCH
	sudo dpkg -i simple-obfs_*.deb
	sudo apt-get install -fy
fi
}

export XZ_DEFAULTS=--memlimit=128MiB

OSID=$(grep ^ID= /etc/os-release|cut -d= -f2)
OSVER=$(lsb_release -cs)
BUILD_LIB=0
BUILD_BIN=0

case "$1" in
--help|-h)
	help_usage
	;;
lib)
	BUILD_LIB=1
	;;
bin)
	BUILD_BIN=1
	;;
all|"")
	BUILD_LIB=1
	BUILD_BIN=1
	;;
*)
	echo Parameter error, exiting ...
	exit
esac

# Exit if in a git repo
[ -d .git ] && help_usage

case "$OSVER" in
jessie)
	BPO="debhelper libsodium-dev"
	;;
xenial)
	BPO=debhelper
	;;
esac
apt_init "git-buildpackage equivs" "$BPO"

case "$OSVER" in
wheezy|precise)
	echo Sorry, your system $OSID/$OSVER is not supported.
	;;
jessie|stretch|unstable|sid|zesty)
	build_install_libbloom exp1
	build_install_sslibev exp1
	build_install_simpleobfs exp1
	apt_clean
	;;
trusty)
	build_install_libcork trusty
	build_install_libcorkipset trusty
	build_install_libmbedtls debian/jessie-backports
	build_install_libsodium
	build_install_libbloom exp1_trusty
	patch_sslibev_dh9 exp1
	build_install_sslibev exp1
	build_install_simpleobfs exp1_trusty
	apt_clean
	;;
xenial|yakkety)
	build_install_libcork debian
	build_install_libcorkipset debian
	build_install_libbloom exp1
	build_install_sslibev exp1
	build_install_simpleobfs exp1
	apt_clean
	;;
*)
	echo Your system $OSID/$OSVER is not supported yet.
	echo Please report issue:
	echo "    https://github.com/shadowsocks/shadowsocks-libev/issues/new"
	;;
esac