#!/usr/bin/env bash
# Pi-hole: A black hole for Internet advertisements
# (c) 2015, 2016 by Jacob Salmela
# Network-wide ad blocking via your Raspberry Pi
# http://pi-hole.net
# Calculates stats and displays to an LCD
#
# Pi-hole 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 2 of the License, or
# (at your option) any later version.


#Functions##############################################################################################################

setupVars="/etc/pihole/setupVars.conf"

if [[ -f "${setupVars}" ]] ; then
    . "${setupVars}"
else
    echo "::: WARNING: /etc/pihole/setupVars.conf missing. Possible installation failure."
    echo ":::          Please run 'pihole -r', and choose the 'reconfigure' option to reconfigure."
    exit 1
fi

piLog="/var/log/pihole.log"
gravityraw="/etc/pihole/list.preEventHorizon"
gravity="/etc/pihole/gravity.list"

IPv4_address=${IPv4_address%/*}

CalcPercentBlockedToday() {
	if [ "${queriesToday}" != "Err." ] && [ "${blockedToday}" != "Err." ]; then
		if [ "${queriesToday}" != 0 ]; then #Fixes divide by zero error :)
		 #scale 2 rounds the number down, so we'll do scale 4 and then trim the last 2 zeros
			percentBlockedToday=$(echo "scale=4; $(pihole stats blocked)/$(pihole stats hits)*100" | bc)
			percentBlockedToday=$(sed 's/.\{2\}$//' <<< "${percentBlockedToday}")
		else
			percentBlockedToday=0
		fi
	fi
}

outputJSON() {
	CalcPercentBlockedToday
	printf '{"domains_being_blocked":"%s","dns_queries_today":"%s","ads_blocked_today":"%s","ads_percentage_today":"%s"}\n' "$(pihole stats list)" "$(pihole stats hits)" "$(pihole stats blocked)" "${percentBlockedToday}"
}

normalChrono() {
	for (( ; ; ))
	do
		clear
		# Displays a colorful Pi-hole logo
		echo " ___ _     _        _"
		echo "| _ (_)___| |_  ___| |___"
		echo "|  _/ |___| ' \/ _ \ / -_)"
		echo "|_| |_|   |_||_\___/_\___|"
		echo ""
		echo "        ${IPv4_address}"
		echo ""
		uptime | cut -d' ' -f11-
		#uptime -p	#Doesn't work on all versions of uptime
		uptime | awk -F'( |,|:)+' '{if ($7=="min") m=$6; else {if ($7~/^day/) {d=$6;h=$8;m=$9} else {h=$6;m=$7}}} {print d+0,"days,",h+0,"hours,",m+0,"minutes."}'
		echo "-------------------------------"
		# Uncomment to continually read the log file and display the current domain being blocked
		#tail -f /var/log/pihole.log | awk '/\/etc\/pihole\/gravity.list/ {if ($7 != "address" && $7 != "name" && $7 != "/etc/pihole/gravity.list") print $7; else;}'

		#uncomment next 4 lines to use original query count calculation
		#today=$(date "+%b %e")
		#todaysQueryCount=$(cat /var/log/pihole.log | grep "$today" | awk '/query/ {print $7}' | wc -l)
		#todaysQueryCountV4=$(cat /var/log/pihole.log | grep "$today" | awk '/query/ && /\[A\]/ {print $7}' | wc -l)
		#todaysQueryCountV6=$(cat /var/log/pihole.log | grep "$today" | awk '/query/ && /\[AAAA\]/ {print $7}' | wc -l)


		CalcPercentBlockedToday

		echo "Blocking:      $(pihole stats list)"
		echo "Queries:       $(pihole stats hits)" #same total calculation as dashboard
		echo "Pi-holed:      $(pihole stats blocked) ($percentBlockedToday%)"

		sleep 5
	done
}

displayHelp() {
	cat << EOM
::: Displays stats about your piHole!
:::
::: Usage: sudo pihole -c [optional:-j]
::: Note: If no option is passed, then stats are displayed on screen, updated every 5 seconds
:::
::: Options:
:::  -j, --json		output stats as JSON formatted string
:::  -h, --help		display this help text
EOM
    exit 1
}

if [[ $# = 0 ]]; then
	normalChrono
fi

for var in "$@"
do
  case "$var" in
    "-j" | "--json"  ) outputJSON;;
    "-h" | "--help"  ) displayHelp;;
    *                ) exit 1;;
  esac
done