#!/bin/bash
#
# Copyright (c) 2017 Igor Pecovnik, igor.pecovnik@gma**.com
#
# This file is licensed under the terms of the GNU General Public
# License version 2. This program is licensed "as is" without any
# warranty of any kind, whether express or implied.

# check for root
#
if [[ $EUID != 0 ]]; then
	echo "Warning. This script requires root privileges. Exiting ..."
	sleep 3
	exit
fi

echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
if [[ $? -ne 0 ]]; then
	read -n 1 -s -p "Warning. Configurator can't work properly without internet connection. Press CTRL C to stop to stop or any key to ignore and continue."
fi

function get_wlan_interface ()
{
# search for wlan interfaces and provide a selection menu if there are more than one
# selected is stored into variable WLAN_SELECTED
#
	IFS=$'\r\n' GLOBIGNORE='*' command eval  'WLAN_INTERFACES=($(iw dev | grep Interface | sed -e "s/\tInterface //" | sort))'
	local LIST=()
	for i in "${WLAN_INTERFACES[@]}"
	do
			LIST+=( "${i[0]//[[:blank:]]/}" "" )
	done
	LIST_LENGHT=$((${#LIST[@]}/2));
	if [ "$LIST_LENGHT" -eq 1 ]; then
			WLAN_SELECTED=${WLAN_INTERFACES[0]}
	else
			exec 3>&1
			WLAN_SELECTED=$(dialog --nocancel --backtitle "$BACKTITLE" --no-collapse --title "Select interface" --clear --menu "" $((6+${LIST_LENGHT})) 30 15 "${LIST[@]}" 2>&1 1>&3)
			exec 3>&-
	fi
}

# make a bacup
cp /etc/network/interfaces /etc/network/interfaces.debian-config.backup

# Install basic stuff
#
echo "Downloading dependencies ..."
apt-get -qq -y --no-install-recommends install bc expect rcconf  >> /dev/null

# gather some info
#
[[ -f /etc/armbian-release ]] && source /etc/armbian-release && ARMBIAN="Armbian $VERSION $IMAGE_TYPE";
DISTRO=$(lsb_release -is)
DISTROID=$(lsb_release -rs)
BACKTITLE="$ARMBIAN $DISTRO $DISTROID configuration utility, http://www.armbian.com"
TITLE="Configuring $BOARD_NAME"
WIRELESS_ADAPTER="wlan0"
NETWORK_CONF="/etc/network/interfaces"

LIST=()
###########################################################################################################################################
# here we add new items to menu. with condition when needed

[[ -f /usr/bin/h3disp && "$LINUXFAMILY" = "sun8i" && "$BRANCH" = "default" && -n $(bin2fex </boot/script.bin 2>/dev/null | grep -w "hdmi_used = 1") ]] && LIST+=( "Display" "set the display resolution" )
[[ -n $(ls -1 /sys/class/net/ | grep -vE "eth|lo|enp") ]] && LIST+=( "Wireless" "Connect to your router" )
[[ -n $(grep -w apt /etc/apt/sources.list.d/armbian.list) ]]  && LIST+=( "Nightly" "Switch to daily builds" )
LIST+=( "Hotspot" "Creates wireless Access Point" )
LIST+=( "Network" "Edit network settings" )
[[ -f /boot/armbianEnv.txt ]] && LIST+=( "Booting" "Edit boot environment" )
[[ -f /usr/sbin/nand-sata-install ]] && LIST+=( "Install" "Install Armbian to SATA, eMMC, NAND, USB" )
LIST+=( "Services" "Toogle running services" )
[[ -f /usr/bin/armbianmonitor ]] && LIST+=( "Monitor" "Provides simple CLI monitoring" )
[[ -f /usr/bin/softy ]] && LIST+=( "Softy" "Install 3rd party applications" )
[[ -f /usr/bin/armbianmonitor ]] && LIST+=( "Diagnostics" "Send diagnostics" )
###########################################################################################################################################
LISTLENGHT="$((7+${#LIST[@]}/2))"


# main dialog routine
DIALOG_CANCEL=1
DIALOG_ESC=255

while true; do
	exec 3>&1
	selection=$(dialog --backtitle "$BACKTITLE" --title "$TITLE" --clear --cancel-label "Exit to shell" --menu "Please select:" $LISTLENGHT 70 15 \
	"${LIST[@]}" 2>&1 1>&3)
	exit_status=$?
	exec 3>&-
	case $exit_status in
	$DIALOG_CANCEL)
		#clear
		#echo -e "\n\e[0;33mThank you for using Armbian configuration tool! Support: \e[1m\e[39mwww.armbian.com\x1B[0m\n"
		exit
	;;
	$DIALOG_ESC)
		clear
		exit 1
		;;
	esac

	#######################################################################################################################################
	case $selection in

	"Display" )
		h3disp
		exit
	;;
	"Services" )
		rcconf
	;;

	"Network" )
		dialog --backtitle "$BACKTITLE" --title "Edit network configuration" --no-collapse --editbox /etc/network/interfaces 30 0 2> /etc/network/interfaces.out
		[[ $? = 0 ]] && mv /etc/network/interfaces.out /etc/network/interfaces
	;;

	"Hotspot" )
		if [[ -n $(service hostapd status | grep -w active | grep -w running) ]]; then
			dialog --title "Info" --backtitle "$BACKTITLE" --no-collapse --yesno "\nHostapd service is configured and running.\n\nDo you want to stop the service?" 9 57
			[[ $? = 0 ]] && service hostapd stop && sed -i "s/^DAEMON_CONF=.*/DAEMON_CONF=/" /etc/init.d/hostapd
		else
			# check for WLAN interfaces
			get_wlan_interface
			# display dialog
			dialog --backtitle "$BACKTITLE" --title "Please wait" --infobox "\nChecking nl80211 hostapd driver compatibility." 5 50
			apt-get -o Dpkg::Options::="--force-confnew" -y -qq --no-install-recommends install hostapd > /dev/null
			# change to selected interface
			sed -i "s/^interface=.*/interface=$WLAN_SELECTED/" /etc/hostapd.conf
			# add hostapd.conf to services
			sed -i "s/^DAEMON_CONF=.*/DAEMON_CONF=\/etc\/hostapd.conf/" /etc/init.d/hostapd
			# check both options
			CHECK=$(systemctl daemon-reload;service hostapd restart;service hostapd status|grep fail)
			if [[ -n "$CHECK" ]]; then
				dialog --backtitle "$BACKTITLE" --title "Please wait" --infobox "\nChecking Realtek hostapd driver compatibility." 5 50
				apt-get -o Dpkg::Options::="--force-confnew" -y -qq --no-install-recommends install hostapd-realtek > /dev/null
				# change to selected interface
				sed -i "s/^interface=.*/interface=$WLAN_SELECTED/" /etc/hostapd.conf
			fi
			CHECK=$(systemctl daemon-reload;service hostapd restart;service hostapd status|grep fail)
			# if both fails there is other problem
			if [[ -n "$CHECK" ]]; then
				dialog --backtitle "$BACKTITLE" --title "Warning" --infobox "\nNo compatible hostapd driver found." 5 39
				sed -i "s/^DAEMON_CONF=.*/DAEMON_CONF=/" /etc/init.d/hostapd
				systemctl daemon-reload;service hostapd restart
				sleep 3
				exit
			fi

			dialog --title "Choose a AP mode" --backtitle "$BACKTITLE" --help-button --help-label "Manual" --yes-label "Bridge" --no-label "NAT" --yesno "\nBridge: wireless clients will use your routers DHCP server\n\nNAT: with own DHCP server, out of your primary network\n\nManual: edit configuration manually" 11 70
			response=$?
			DEFAULT_ADAPTER=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)')

			TEMP_CONF=/etc/network/interfaces.out
			cp $NETWORK_CONF $TEMP_CONF

			case $response in
				# bridge
				0)
					sed -i '/^#/ d' $TEMP_CONF
					apt-get -qq -y --no-install-recommends install bridge-utils >> /dev/null
					sed -i "s/^auto lo.*/auto lo br0/" $TEMP_CONF
					# if we have dhcp on default adapter
					if [[ -n $(grep dhcp $TEMP_CONF | grep "$DEFAULT_ADAPTER" | grep -v br) ]]; then
						sed -i "s/^iface $DEFAULT_ADAPTER inet dhcp/iface $DEFAULT_ADAPTER inet manual/" $TEMP_CONF
						echo -e "\niface br0 inet dhcp\nbridge_ports $DEFAULT_ADAPTER $WIRELESS_ADAPTER" >> $TEMP_CONF
						echo -e "\nauto $WIRELESS_ADAPTER\niface $WIRELESS_ADAPTER inet manual" >> $TEMP_CONF
					#fi
					# if we have static on default adapter
					#if [[ -n $(grep static $TEMP_CONF | grep "$DEFAULT_ADAPTER" | grep -v br) ]]; then
					else
						sed -i "s/^iface $DEFAULT_ADAPTER inet static/iface $DEFAULT_ADAPTER inet manual/" $TEMP_CONF
						sed -i "/^iface $DEFAULT_ADAPTER inet manual/a iface br0 inet static" $TEMP_CONF
						echo -e "bridge_ports $DEFAULT_ADAPTER $WIRELESS_ADAPTER" >> $TEMP_CONF
						echo -e "\nauto $WIRELESS_ADAPTER\niface $WIRELESS_ADAPTER inet manual" >> $TEMP_CONF
					fi
					sed -i 's/^bridge=.*/bridge=br0/' /etc/hostapd.conf
				;;

				# NAT
				1)
					sed -i '/^#/ d' $TEMP_CONF
					apt-get -qq -y --no-install-recommends install isc-dhcp-server
					echo -e "\nallow-hotplug $WIRELESS_ADAPTER\niface $WIRELESS_ADAPTER inet static\naddress 192.168.3.10\nnetmask 255.255.255.0\ngateway 192.168.3.1" >> $TEMP_CONF
					sed -i 's/^option domain-name "example.org";/#option domain-name "example.org";/' /etc/dhcp/dhcpd.conf
					sed -i 's/^option domain-name-servers ns1.example.org, ns2.example.org;/#option domain-name-servers ns1.example.org, ns2.example.org;/' /etc/dhcp/dhcpd.conf
					sed -i 's/^#authoritative;/authoritative;/' /etc/dhcp/dhcpd.conf
					# removes our previous conf
					sed -i '/# armbian conf/,$d' /etc/dhcp/dhcpd.conf
					# creates new
					echo "# armbian conf" >> /etc/dhcp/dhcpd.conf
					echo -e "subnet 192.168.3.0 netmask 255.255.255.0 {\nrange 192.168.3.10 192.168.3.210;" >> /etc/dhcp/dhcpd.conf
					echo -e "option broadcast-address 192.168.3.255;\noption routers 192.168.3.1;" >> /etc/dhcp/dhcpd.conf
					echo -e "default-lease-time 600;\nmax-lease-time 7200;\noption domain-name \"local\";" >> /etc/dhcp/dhcpd.conf
					echo -e "option domain-name-servers 8.8.8.8, 8.8.4.4;\n}" >> /etc/dhcp/dhcpd.conf
					# - Enable IPv4 forwarding
					sed -i "/net.ipv4.ip_forward=/c\net.ipv4.ip_forward=1" /etc/sysctl.conf
					echo 1 > /proc/sys/net/ipv4/ip_forward
					# - Apply iptables
					iptables -t nat -A POSTROUTING -o $DEFAULT_ADAPTER -j MASQUERADE
					iptables -A FORWARD -i $DEFAULT_ADAPTER -o $WIRELESS_ADAPTER -m state --state RELATED,ESTABLISHED -j ACCEPT
					iptables -A FORWARD -i $WIRELESS_ADAPTER -o $DEFAULT_ADAPTER -j ACCEPT
					# - Save IP tables, applied during ifup in /etc/network/interfaces.
					iptables-save > /etc/iptables.ipv4.nat
					# change to proper device
					sed -i 's/^INTERFACES=.*/INTERFACES='$WIRELESS_ADAPTER'/' /etc/default/isc-dhcp-server
					service isc-dhcp-server restart
					sed -i 's/^bridge=.*/#bridge=.*/' /etc/hostapd.conf
				;;
			3) exit;;
			255) exit;;
			esac
			dialog --title "Manually adjust network configuration if needed" --backtitle "$BACKTITLE" --ok-label "Reboot to apply new settings" --no-collapse --editbox $TEMP_CONF 30 0 2> $TEMP_CONF".tmp"
			if [[ $? = 0 ]]; then
				mv $TEMP_CONF $NETWORK_CONF
				reboot
			fi
		fi
	;;

	"Booting" )
		dialog --title "Edit u-boot environment" --no-collapse --editbox /boot/armbianEnv.txt 30 0 2> /boot/armbianEnv.txt.out
		[[ $? = 0 ]] && mv /boot/armbianEnv.txt.out /boot/armbianEnv.txt
	;;

	"Nightly" )
		sed -i 's/apt.armbian.com/beta.armbian.com/' /etc/apt/sources.list.d/armbian.list
		debconf-apt-progress -- apt-get update
		debconf-apt-progress -- apt-get upgrade
	;;
	"Install" )
		nand-sata-install
	;;

	"Wireless" )
		array=( $(iw dev | grep Interface | sed -e "s/\tInterface//") )
		declared_wlans=0;
		echo ${#array[@]}
		for i in "${array[@]}"
			do
			if grep --quiet "^iface $i" /etc/network/interfaces; then
				let declared_wlans+=1
			fi
		done
		if [ $declared_wlans = ${#array[@]} ]; then
			dialog --title "Error" --backtitle "$BACKTITLE" --no-collapse --msgbox "\nWireless network is in use by if-up service. Remove it from config." 7 57
		else
			CURRENT_SSID=$(nmcli -m m connection show --active | head -1 | awk '{print $2}')
			if [[ -n $(service hostapd status | grep -w active | grep -w running) ]]; then
				dialog --title "Error" --backtitle "$BACKTITLE" --no-collapse --msgbox "\nHostapd service is running. Disable it and try again." 7 57
				exit
			elif [[ -n $CURRENT_SSID ]]; then
				dialog --title "Info" --backtitle "$BACKTITLE" --no-collapse --yesno "\nAlready connected to $CURRENT_SSID.\n\nDo you want to disconnect?" 9 57
				[[ $? = 0 ]] && nmcli connection down id $CURRENT_SSID
			else
			nmtui-connect
			fi
		fi
	;;

	"Diagnostics" )
		clear
		armbianmonitor -u
		echo ""
		read -n 1 -s -p "Press any key to continue"
	;;

	"Softy" )
		softy
	;;

	"Monitor" )
		clear
		armbianmonitor -m | dialog --backtitle "$BACKTITLE" --title "Simple CLI monitoring $BOARD" --progressbox 15 64
	;;

	esac
	#######################################################################################################################################
done