#!/sbin/sh

OUTFD=$2
ZIP=$3
BACKUP_DIR="/data/media/0/nanodroid_backups"
VERSION=23.1.2.20210117

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

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

grep_prop() {
	sed -n "s/^${1}=//p" /system/build.prop ${2} | 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 () {
	grep -q " $(readlink -f ${1}) " /proc/mounts 2>/dev/null
	return $?
}

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

	if [ -n "${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
	unzip -oq "${ZIP}" busybox.arm -d "/dev/tmp"
	unzip -oq "${ZIP}" busybox.x86 -d "/dev/tmp"

	case $(uname -m) in
		arm* | aarch* )	local bb_arch=arm ;;
		x86* )	local bb_arch=x86 ;;
		*    ) error "arch \"$(uname -m)\" is not supported"
	esac

	mkdir -p /dev/tmp/busybox
	ln -s /dev/tmp/busybox.${bb_arch} /dev/tmp/busybox/busybox

	chmod 0755 /dev/tmp/busybox.${bb_arch}
	/dev/tmp/busybox.${bb_arch} --install -s /dev/tmp/busybox/

	OLD_PATH=${PATH}
	export PATH=/dev/tmp/busybox:/system/bin:/vendor/bin
}

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

	${BOOTMODE} || umount_partitions

	exit 1
}


##########################################################################################
# taken from Magisk, with minor modifications for NanoDroid
# mount partitions
##########################################################################################

toupper() {
	echo "$@" | tr '[:lower:]' '[:upper:]'
}

find_block () {
	local block partname devname device

	block=${1}${SLOT}
	device=$(find /dev/block \( -type b -o -type c -o -type l \) -name ${block} | head -n 1)

	if [ -n "$device" ]; then
		readlink -f "$device"
		return 0
	fi

	for uevent in /sys/dev/block/*/uevent; do
		partname=$(awk -F= '/PARTNAME/{print $2}' ${uevent})
		devname=$(awk -F= '/DEVNAME/{print $2}' ${uevent})
		if [ "$(toupper ${block})" = "$(toupper ${partname})" ]; then
			echo /dev/block/${devname}
			return 0
		fi
	done

	device=$(find /dev \( -type b -o -type c -o -type l \) -maxdepth 1 -iname ${block} | head -n 1)
	if [ -n "$device" ]; then
		readlink -f "$device"
		return 0
	fi

	return 1

}

mount_partitions () {
	if ! ${BOOTMODE}; then
		VENDOR_COMPAT=FALSE
		SYSTEM_AS_ROOT=FALSE

		SLOT=$(grep_cmdline androidboot.slot_suffix)
		if [ -z ${SLOT} ]; then
			SLOT=$(grep_cmdline androidboot.slot)
			[ -z ${SLOT} ] || SLOT=_${SLOT}
		fi
		[ -z ${SLOT} ] && DEVICE_AB=FALSE || DEVICE_AB=TRUE
		decho " INFO: #1 [SLOT] ${SLOT}"

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

		mount -o bind /dev/urandom /dev/random

		SYSTEM_BLOCK=$(find_block system)
		decho " INFO: #5 [SYSTEM_BLOCK] ${SYSTEM_BLOCK}"

		if is_mounted /system_root; then
			umount /system 2&>/dev/null
			umount /system_root 2&>/dev/null
		fi

		mkdir -p /system /system_root
		mount -o rw ${SYSTEM_BLOCK} /system

		if [ -f /system/build.prop ]; then
			SYSTEM=/system
		elif [ -f /system/system/build.prop -o -f /system/init -o -L /system/init ]; then
			SYSTEM_AS_ROOT=true
			SYSTEM=/system/system
			if ! mount --move /system /system_root; then
				umount /system
				umount -l /system
				mount -o rw ${SYSTEM_BLOCK} /system_root
			fi
			mount -o bind /system_root/system /system
		fi

		VENDOR_BLOCK=$(find_block vendor)
		echo " INFO: #7 [VENDOR_BLOCK] ${VENDOR_BLOCK}"

		! is_mounted /vendor && mount -o ro /vendor
		! is_mounted /vendor && mount -o ro ${VENDOR_BLOCK} /vendor

		if [[ ! $(is_mounted /vendor) && -d /system/vendor ]]; then
			### XXX work-around required for some devices
			VENDOR_COMPAT=TRUE
			ln -sf /system/vendor /vendor >/dev/null
		fi

		echo " "
		mount | sed -e '/magisk/d' | awk '{print $1 " on " $3 " params: " $6}'
		echo " "

		echo " INFO: #8 [prop]"
		ls -l /system/*.prop

		[ -d /system/apex ] && mount_apex
	fi

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


	if [ -d /apex/com.android.art ]; then
		export ANDROID_ART_ROOT=/apex/com.android.art
		export ANDROID_RUNTIME_ROOT=${ANDROID_ART_ROOT}
	elif [ -d /apex/com.android.runtime ]; then
		export ANDROID_RUNTIME_ROOT=/apex/com.android.runtime
	fi

	export ANDROID_TZDATA_ROOT=/apex/com.android.tzdata
	export ANDROID_I18N_ROOT=/apex/com.android.i18n
}

##########################################################################################
# taken from Magisk, with minor modifications for NanoDroid
# mount APEX directories or images
##########################################################################################

mount_apex () {
	mkdir -p /apex

	for apex in /system/apex/*; do
		apex_mount="/apex/$(basename ${apex} .apex)"
		apex_loop="/dev/loop_apex_$(basename ${apex} .apex)"

		[ "${apex_mount}" == /apex/com.android.runtime.release ] && apex_mount=/apex/com.android.runtime
		[ "${apex_mount}" == /apex/com.android.runtime.debug ] && apex_mount=/apex/com.android.runtime
		[ "${apex_mount}" == /apex/com.android.art.release ] && apex_mount=/apex/com.android.art
		[ "${apex_mount}" == /apex/com.android.art.debug ] && apex_mount=/apex/com.android.art

		mkdir -p "${apex_mount}"

		if [ -f "${apex}" ]; then
			unzip -oq "${apex}" apex_payload.img -d /apex
			mount_apex_loop "${apex_mount}" || error "APEX loop setup failed!"
		elif [ -d "${apex}" ]; then
			mount -o bind "${apex}" "${apex_mount}"
		fi
	done

	echo " INFO: #10 [APEX [ALL]] $(ls /system/apex/*)"
}

##########################################################################################
# taken from Magisk, with minor modifications for NanoDroid
# helper function for mounting APEX directories or images
##########################################################################################

mount_apex_loop () {
	local number=0
	local minorx=1
	local loop

	[ -e /dev/block/loop1 ] && minorx=$(stat -Lc '%T' /dev/block/loop1)

	apex_mount="${1}"

	echo " *** mount_apex_loop [apex_mount]: ${apex_mount}"

	while [ ${number} -lt 64 ]; do
		loop=/dev/block/loop${number}
		[ -e ${loop} ] || mknod ${loop} b 7 $((number * minorx))

		if losetup "${loop}" /apex/apex_payload.img 2>/dev/null; then
			echo " *** mount_apex_loop [loop]: ${loop}"
			if mount -text4 -oro,noatime "${loop}" "${apex_mount}"; then
				rm -f /apex/apex_payload.img
				break
			fi
		fi

		number=$((number + 1))
	done
}

##########################################################################################
# unmount partitions
##########################################################################################

umount_partitions () {
	umount -l /system_root 2>/dev/null
	umount -l /system 2>/dev/null
	umount -l /system/vendor 2>/dev/null
	umount -l /vendor 2>/dev/null
	umount -l /dev/random 2>/dev/null

	mount | awk '/ \/apex/{print $1 " " $3}' | while read apex_loop apex_mount; do
		umount -l "${apex_mount}" 2>/dev/null
		losetup -d "${apex_loop}" 2>/dev/null
	done

	rm -rf /apex

	unset ANDROID_RUNTIME_ROOT
	unset ANDROID_TZDATA_ROOT
}

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

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

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

	rm -f "${system_list}"
}

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

detect_bootmode
setup_busybox
mount_partitions

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

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

# System Mode uninstallation
[ -f /data/adb/NanoDroid_FileList ] && system_mode_uninstall /data/adb/NanoDroid_FileList
[ -f /system/addon.d/NanoDroid_FileList ] && system_mode_uninstall /system/addon.d/NanoDroid_FileList

# remove Patcher
rm -rf /data/adb/nanodroid_patcher
rm -f /system/addon.d/70-nanodroidpatcher.sh
rm -f /data/adb/NanoDroid_Patched

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

ui_print " >> clean up"

${BOOTMODE} || umount_partitions

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

exit 0