#!/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
# Check Pi-hole core and admin pages versions and determine what
# upgrade (if any) is required. Automatically updates and reinstalls
# application if update is detected.
#
# 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.

# Variables

readonly WEBINTERFACEGITURL="https://github.com/pi-hole/AdminLTE.git"
readonly WEBINTERFACEDIR="/var/www/html/admin"
readonly PIHOLEGITURL="https://github.com/pi-hole/pi-hole.git"
readonly PIHOLEFILESDIR="/etc/.pihole"

spinner() {
	local pid=${1}
	local delay=0.50
	local spinstr='/-\|'
	while [ "$(ps a | awk '{print $1}' | grep "${pid}")" ]; do
		local temp=${spinstr#?}
		printf " [%c]  " "${spinstr}"
		local spinstr=${temp}${spinstr%"$temp"}
		sleep ${delay}
		printf "\b\b\b\b\b\b"
	done
	printf "    \b\b\b\b"
}

getGitFiles() {
	# Setup git repos for directory and repository passed
	# as arguments 1 and 2
	echo ":::"
	echo "::: Checking for existing repository..."
	if is_repo "${1}"; then
		update_repo "${1}"
	else
		make_repo "${1}" "${2}"
	fi
}

is_repo() {
	# Use git to check if directory is currently under VCS
	echo -n ":::    Checking $1 is a repo..."
	cd "${1}" &> /dev/null || return 1
	git status &> /dev/null && echo " OK!"; return 0 || echo " not found!"; return 1
}

make_repo() {
	# Remove the non-repod interface and clone the interface
	echo -n ":::    Cloning $2 into $1..."
	rm -rf "${1}"
	git clone -q --depth 1 "${2}" "${1}" > /dev/null & spinner $!
	echo " done!"
}

update_repo() {
# Pull the latest commits
	echo -n ":::     Updating repo in $1..."
	cd "${1}" || exit 1
	git stash -q > /dev/null & spinner $!
	git pull -q > /dev/null & spinner $!
	echo " done!"
}

if [ ! -d "/etc/.pihole" ]; then #This is unlikely
	echo "::: Critical Error: Pi-Hole repo missing from system!"
	echo "::: Please re-run install script from https://github.com/pi-hole/pi-hole"
	exit 1;
fi
if [ ! -d "/var/www/html/admin" ]; then #This is unlikely
	echo "::: Critical Error: Pi-Hole repo missing from system!"
	echo "::: Please re-run install script from https://github.com/pi-hole/pi-hole"
	exit 1;
fi

echo "::: Checking for updates..."
# Checks Pi-hole version > pihole only > current local git repo version : returns string in format vX.X.X
piholeVersion=$(pihole -v -p -c)
# Checks Pi-hole version > pihole only > remote upstream repo version : returns string in format vX.X.X
piholeVersionLatest=$(pihole -v -p -l)

# Checks Pi-hole version > admin only > current local git repo version : returns string in format vX.X.X
webVersion=$(pihole -v -a -c)
# Checks Pi-hole version > admin only > remote upstream repo version : returns string in format vX.X.X
webVersionLatest=$(pihole -v -a -l)

echo ":::"
echo "::: Pi-hole version is $piholeVersion (Latest version is $piholeVersionLatest)"
echo "::: Web Admin version is $webVersion (Latest version is $webVersionLatest)"
echo ":::"

# Logic
# If latest versions are blank - we've probably hit Github rate limit (stop running `pihole -up so often!):
#            Update anyway
# If Core up to date AND web up to date:
#            Do nothing
# If Core up to date AND web NOT up to date:
#            Pull web repo
# If Core NOT up to date AND web up to date:
#            pull pihole repo, run install --unattended -- reconfigure
# if Core NOT up to date AND web NOT up to date:
#            pull pihole repo run install --unattended



if [[ "${piholeVersion}" == "${piholeVersionLatest}" ]] && [[ "${webVersion}" == "${webVersionLatest}" ]]; then
	echo "::: Everything is up to date!"
	echo ""
	exit 0

elif [[ "${piholeVersion} == ${piholeVersionLatest}" ]] && [[ "${webVersion}" != "${webVersionLatest}" ]]; then
	echo "::: Pi-hole Web Admin files out of date"
	getGitFiles "${WEBINTERFACEDIR}" "${WEBINTERFACEGITURL}"
	echo ":::"
	webVersion=$(pihole -v -a -c)
	echo "::: Web Admin version is now at ${webVersion}"
	echo "::: If you had made any changes in '/var/www/html/admin', they have been stashed using 'git stash'"
	echo ""
elif [[ "${piholeVersion}" != "${piholeVersionLatest}" ]] && [[ "${webVersion}" == "${webVersionLatest}" ]]; then
	echo "::: Pi-hole core files out of date"
	getGitFiles "${PIHOLEFILESDIR}" "${PIHOLEGITURL}"
	/etc/.pihole/automated\ install/basic-install.sh --reconfigure --unattended
	echo ":::"
	piholeVersion=$(pihole -v -p -c)
	echo "::: Pi-hole version is now at ${piholeVersion}"
	echo "::: If you had made any changes in '/etc/.pihole', they have been stashed using 'git stash'"
	echo ""
elif [[ "${piholeVersion}" != "${piholeVersionLatest}" ]] && [[ "${webVersion}" != "${webVersionLatest}" ]]; then
	echo "::: Updating Everything"
	getGitFiles "${PIHOLEFILESDIR}" "${PIHOLEGITURL}"

	/etc/.pihole/automated\ install/basic-install.sh --unattended || echo "Unable to complete update, contact Pi-hole" && exit 1

	# Checks Pi-hole version > admin only > current local git repo version : returns string in format vX.X.X
	webVersion=$(pihole -v -a -c)
	# Checks Pi-hole version > admin only > current local git repo version : returns string in format vX.X.X
	piholeVersion=$(pihole -v -p -c)
	echo ":::"
	echo "::: Pi-hole version is now at ${piholeVersion}"
	echo "::: If you had made any changes in '/etc/.pihole', they have been stashed using 'git stash'"
	echo ":::"
	echo "::: Pi-hole version is now at ${piholeVersion}"
	echo "::: If you had made any changes in '/etc/.pihole', they have been stashed using 'git stash'"
	echo ""
fi