#!/sbin/sh

OUTFD=$2
ZIP=$3
BACKUP_DIR="/data/media/0/nanodroid_backups"
VERSION=22.3.20190805

detect_bootmode () {
	[ -z ${BOOTMODE} ] && BOOTMODE=false
	${BOOTMODE} || ps | grep zygote | grep -qv grep && BOOTMODE=true
	${BOOTMODE} || ps -A 2>/dev/null | grep zygote | grep -qv grep && BOOTMODE=true

	${BOOTMODE} && error "NanoDroid Uninstaller can't be run from Magisk Manager!"
}

ui_print() {
	echo -n -e "ui_print $1\n" >> /proc/self/fd/$OUTFD
	echo -n -e "ui_print\n" >> /proc/self/fd/$OUTFD
}

grep_prop() {
	REGEX="${1}"
	shift
	FILES="${@}"
	[ -z "${@}" ] && FILES='/system/build.prop'
	sed -n "s/^${REGEX}=//p" ${FILES} | \
		head -n 1
}

grep_cmdline() {
	local REGEX="s/^${1}=//p"
	sed -E 's/ +/\n/g' /proc/cmdline | \
		sed -n "${REGEX}" 2>/dev/null
}

is_mounted() {
	if [ ! -z "$2" ]; then
		cat /proc/mounts | grep $1 | grep $2, >/dev/null
	else
		cat /proc/mounts | grep $1 >/dev/null
	fi
	return $?
}

set_perm () {
	chown ${2}:${3} ${1} || error "failed change owner for ${1}"
	chmod ${4} ${1} || error "failed to change mode for ${1}"

	if [ ! -z "${5}" ]; then
		chcon ${5} ${1} 2>/dev/null
	else	chcon 'u:object_r:system_file:s0' ${1} 2>/dev/null
	fi
}

set_perm_recursive() {
	find ${1} -type d 2>/dev/null | while read dir; do
		set_perm ${dir} ${2} ${3} ${4} ${6}
	done
	find ${1} -type f 2>/dev/null | while read file; do
		set_perm ${file} ${2} ${3} ${5} ${6}
	done
}

set_perm_data () {
	if [ "${1}" = "-r" ]; then
		echo "    perm: data [recursive] {${2}}"
		set_perm_recursive ${2} 0 0 0755 0644
	else
		echo "    perm: data [single] {${1}}"
		set_perm ${1} 0 0 0644
	fi
}

setup_busybox () {
	mkdir /dev/tmp

	ABI=$(grep_prop ro.product.cpu.abi | cut -c-3)
	ABI2=$(grep_prop ro.product.cpu.abi2 | cut -c-3)
	ABILONG=$(grep_prop ro.product.cpu.abi)

	ARCH=arm

	[ "$ABI" = "x86" ] && ARCH=x86
	[ "$ABI2" = "x86" ] && ARCH=x86
	[ "$ABILONG" = "arm64-v8a" ] && ARCH=arm64
	[ "$ABILONG" = "x86_64" ] && ARCH=x86_64

	case ${ARCH} in
		arm | arm64 )
			unzip -oq "${ZIP}" busybox.arm -d "/dev/tmp"
			BUSY=/dev/tmp/busybox.arm
		;;

		x86 | x86_64 )
			unzip -oq "${ZIP}" busybox.x86 -d "/dev/tmp"
			BUSY=/dev/tmp/busybox.x86
		;;
	esac

	OLD_PATH=${PATH}

	chmod 0755 ${BUSY}
	mkdir -p /dev/tmp/busybox
	ln -s ${BUSY} /dev/tmp/busybox/busybox
	${BUSY} --install -s /dev/tmp/busybox/

	export PATH="/dev/tmp/busybox:${PATH}"
}

error () {
	ui_print " !!"
	ui_print " !! ${@}"
	ui_print " !!"
	exit 1
}

# taken from Magisk, with minor modifications for NanoDroid
mount_partitions () {
	SLOT=$(grep_cmdline androidboot.slot_suffix)
	if [ -z ${SLOT} ]; then
		SLOT=_$(grep_cmdline androidboot.slot)
		[ "${SLOT}" = "_" ] && SLOT=
	fi

	is_mounted /data || mount /data || error "failed to mount /data!"

	mount -o bind /dev/urandom /dev/random
	! is_mounted /system && mount -o rw /system || mount -o rw,remount /system

	if [ ! -f /system/build.prop ]; then
		SYSTEMBLOCK=$(find /dev/block -iname system${SLOT} | head -n 1)
		mount -o rw ${SYSTEMBLOCK} /system
	fi

	if [ -f /system/init.rc ]; then
		[ -L /system_root ] && rm -f /system_root
		mkdir /system_root 2>/dev/null
		mount --move /system /system_root
		mount -o bind /system_root/system /system
	fi

	[ ! -f /system/build.prop ] && error "failed to mount /system (unsupported A/B device?)"

	if [ -L /system/vendor ]; then
		! is_mounted /vendor && mount /vendor
		if ! is_mounted /vendor; then
			VENDORBLOCK=$(find /dev/block -iname vendor${SLOT} | head -n 1)
			mount -o ro ${VENDORBLOCK} /vendor
		fi
	elif [ -d /system/vendor ]; then
		### XXX work-around required for some ROMs
		echo " xxx compat /vendor link created!"
		ln -sf /system/vendor /vendor >/dev/null
	fi

	if [ ! -d /system/xbin ]; then
		NANODROID_BINDIR=/system/bin
	else	NANODROID_BINDIR=/system/xbin
	fi
}

# check for configuration files
config_locations="/data/media/0 /external_sd /sdcard1 /data $(dirname ${ZIP}))"
config_files=".nanodroid-setup .nanodroid-apps .nanodroid-overlay"

restore_apps () {
	backup_path="${BACKUP_DIR}/$(grep_prop ro.build.flavor)_$(grep_prop ro.build.id)"

	if [ -d ${backup_path}/app/ ]; then
		for app in ${backup_path}/app/*; do
			_app=$(basename ${app})
			if [ -d /system/app/${_app} ]; then
				ui_print " << removing backup: app:{_app}"
				rm -rf "${app}"
			else
				ui_print " << restoring: app:${_app}"
				mv "${app}" "/system/app/${_app}"
				set_perm_data -r "/system/app/${_app}"
			fi
		done

		rmdir ${backup_path}/app
	fi

	if [ -d ${backup_path}/priv-app/ ]; then
		for app in ${backup_path}/priv-app/*; do
			_app=$(basename ${app})
			if [ -d /system/priv-app/${_app} ]; then
				ui_print " << removing backup: priv-app:{_app}"
				rm -rf "${app}"
			else
				ui_print " << restoring: priv-app:${_app}"
				mv "${app}" "/system/priv-app/${_app}"
				set_perm_data -r "/system/priv-app/${_app}"
			fi
		done

		rmdir ${backup_path}/priv-app
	fi
}

system_mode_uninstall () {
	ui_print " << uninstalling: NanoDroid (System)"
	ui_print " << using: ${1}"
	system_list=${1}

	if test -h /system/fonts/Roboto-Regular.ttf; then
		CUSTOM_FONT="$(basename $(readlink /system/fonts/Roboto-Regular.ttf) .ttf)"
		ui_print " << Detected NanoDroid-Font (${CUSTOM_FONT})"
		ui_print "  < Restoring original Font"

		${NANODROID_BINDIR}/nanodroid-font -r
	fi

	restore_apps
	xargs rm < ${system_list} || error "failed to remove files"

	# remove empty directories
	# (find -empty not available on Android)
	for dir in app priv-app; do
		find /system/${dir} -type d | xargs rmdir -p
	done

	rm -f "${system_list}"
}

patcher_uninstall () {
	if [ -f /data/adb/NanoDroid_Patched ]; then
		services_name="services.jar_$(grep_prop ro.build.flavor)_$(grep_prop ro.build.id)"

		if [ -f ${BACKUP_DIR}/${services_name} ]; then
			ui_print " << restoring: unpatched services.jar"
			mv "${BACKUP_DIR}/${services_name}" /system/framework/services.jar
			set_perm_data /system/framework/services.jar
		else	ui_print " << can't restore unpatched services.jar"
		fi
	fi

	[ -d /data/adb/nanodroid_patcher ] && rm -rf /data/adb/nanodroid_patcher
	[ -f /system/addon.d/70-nanodroidpatcher.sh ] && rm -f ${addonsh}
	[ -f /data/adb/NanoDroid_Patched ] && rm -f ${pfile}
}

ui_print " "
ui_print "**********************"
ui_print " NanoDroid            "
ui_print " Uninstaller          "
ui_print " ${VERSION}           "
ui_print "**********************"
ui_print " "

detect_bootmode
mount_partitions

ui_print " << Removing installation logs (if any)"

# old format
rm -f /data/adb/NanoDroid_log*
rm -f /data/adb/NanoDroid_twrp*

# new format
rm -rf /data/media/0/nanodroid_logs

# System Mode uninstallation
[ -f /data/adb/NanoDroid_FileList ] && system_mode_uninstall /data/adb/NanoDroid_FileList

patcher_uninstall

for module in NanoDroid NanoDroid_microG NanoDroid_FDroid \
	NanoDroid_BromiteWebView NanoDroid_OsmAnd; do
	if [ -d /data/adb/modules/${module} ]; then
		ui_print " << uninstalling: ${module}"
		rm -rf /data/adb/modules/${module}
	fi
done

ui_print " >> clean up"

umount /system

ui_print " "
ui_print " > Done!"
ui_print " "
ui_print "Thanks for giving NanoDroid a try"
ui_print " "

exit 0
