#!/sbin/sh

OUTFD=$2
ZIP=$3

detect_bootmode () {
	[ -z ${BOOTMODE} ] && BOOTMODE=false
	${BOOTMODE} || ps | grep zygote | grep -qv grep && BOOTMODE=true
	${BOOTMODE} || ps -A | 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 $?
}

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

		x86 | x86_64 )
			unzip -o "${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
}

request_size_check() {
	reqSizeM=`unzip -l "$1" 2>/dev/null | tail -n 1 | awk '{ print $1 }'`
	reqSizeM=$((reqSizeM / 1048576 + 1))
}

image_size_check() {
	e2fsck -yf $1
	curBlocks=`e2fsck -n $1 2>/dev/null | grep $1 | cut -d, -f3 | cut -d\  -f2`;
	curUsedM=`echo "$curBlocks" | cut -d/ -f1`
	curSizeM=`echo "$curBlocks" | cut -d/ -f1`
	curFreeM=$(((curSizeM - curUsedM) * 4 / 1024))
	curUsedM=$((curUsedM * 4 / 1024 + 1))
	curSizeM=$((curSizeM * 4 / 1024))
}

shrink_magisk_img () {
	image_size_check /data/magisk.img
	NEWDATASIZE=$((curUsedM / 32 * 32 + 32))
	if [ "$curSizeM" -gt "$NEWDATASIZE" ]; then
		resize2fs $IMG ${NEWDATASIZE}M
	fi
}

mount_image() {
	if [ ! -d "$2" ]; then
		mount -o rw,remount rootfs /
		mkdir -p "$2" 2>/dev/null
		[ ! -d "$2" ] && return 1
	fi

	if ! is_mounted "$2"; then
		LOOPDEVICE=
		for LOOP in 0 1 2 3 4 5 6 7; do
			if ! is_mounted "$2"; then
				LOOPDEVICE=/dev/block/loop$LOOP
				[ -e $LOOPDEVICE ] || mknod $LOOPDEVICE b 7 $LOOP 2>/dev/null
				losetup $LOOPDEVICE "$1" && mount -t ext4 -o loop $LOOPDEVICE "$2"
				if is_mounted "$2"; then
					break;
				fi
			fi
		done
	fi
}

# 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!"

	! is_mounted /system && mount -o rw /system

	if [ ! -f /system/build.prop ]; then
		SYSTEMBLOCK=$(find /dev/block -iname system${SLOT} | head -n 1)
		mount -t ext4 -o rw ${SYSTEMBLOCK} /system
	fi

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

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

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

restore_apps () {
	if [ -d /sdcard/nanodroid_backups/app/ ]; then
		for app in /sdcard/nanodroid_backups/app/*; do
			if [ -d /system/app/${app} ]; then
				ui_print " << removing backup: app:${app}"
				rm -rf /sdcard/nanodroid_backups/app/${app}
			else
				ui_print " << restoring: app:${app}"
				mv /sdcard/nanodroid_backups/app/${app} \
					/system/app/ || error " failed to restore ${app}"
			fi
		done

		rm -rf /sdcard/nanodroid_backups/app/
	fi

	if [ -d /sdcard/nanodroid_backups/priv-app/ ]; then
		for app in /sdcard/nanodroid_backups/priv-app/*; do
			if [ -d /system/priv-app/${app} ]; then
				ui_print " << removing backup: priv-app:${app}"
				rm -rf /sdcard/nanodroid_backups/priv-app/${app}
			else
				ui_print " << restoring: priv-app:${app}"
				mv /sdcard/nanodroid_backups/priv-app/${app} \
					/system/priv-app/ || error " failed to restore ${app}"
			fi
		done

		rm -rf /sdcard/nanodroid_backups/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 -f < ${system_list} || error "failed to remove files"

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

	rm -f "${system_list}"
}

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

		if [ -f /sdcard/nanodroid_backups/services.jar ]; then
			ui_print " << restoring: unpatched services.jar"
			mv /sdcard/nanodroid_backups/services.jar /system/framework/services.jar \
				|| error " failed to restore services.jar"
		elif [ -f /sdcard/nanodroid_backups/${services_name} ]; then
			ui_print " << restoring: unpatched services.jar"
			mv "/sdcard/nanodroid_backups/${services_name}" /system/framework/services.jar \
				|| error " failed to restore services.jar"
		else	ui_print " << can't restore unpatched services.jar"
		fi
	fi

	[ -d /data/adb/nanodroid_patcher ] && rm -rf /data/adb/nanodroid_patcher

	for addonsh in /system/addon.d/999-nanodroidpatcher.sh \
		/system/addon.d/70-nanodroidpatcher.sh \
		/system/addon.d/91-nanodroid.sh; do
		[ -f ${addonsh} ] && rm -f ${addonsh}
	done

	for pfile in /data/adb/.nanodroid-patcher /data/adb/NanoDroid_Patched; do
		[ -f ${pfile} ] && rm -f ${pfile}
	done
}

ui_print " "
ui_print "*****************************"
ui_print "   NanoDroid 20.4.20181230     "
ui_print "      created by Nanolx      "
ui_print "        Uninstaller          "
ui_print "*****************************"
ui_print " "

detect_bootmode
mount_partitions

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

# old format
rm -f /data/adb/.nanodroid_*
rm -f /data/adb/.recovery_*

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

# System Mode uninstallation
for install_info in /data/adb/.nanodroid-list /data/adb/NanoDroid_FileList; do
	[ -f ${install_info} ] && system_mode_uninstall ${install_info}
done

patcher_uninstall

if [ -f /data/adb/magisk.img ]; then
	mkdir -p /magisk
	mount_image /data/adb/magisk.img /magisk || \
		error " failed to mount /magisk"
fi

if (is_mounted /magisk); then
	for module in NanoDroid NanoDroid_microG NanoDroid_FDroid NanoDroid_BromiteWebView NanoDroid_OsmAnd; do
		if [ -d /magisk/${module} ]; then
			ui_print " << uninstalling: ${module}"
			rm -rf /magisk/${module}
		fi
	done
fi

ui_print " >> clean up"

if (is_mounted /magisk); then
	umount /magisk
	losetup -d $LOOPDEVICE
	rmdir /magisk
	shrink_magisk_img || \
		error " failed to shrink magisk.img"
fi

umount /system

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

exit 0