#!/bin/bash
#########################################################################
#        common - Utility file with common functions for updater        #
#                                                                       #
#                             Dependencies:                             #
#                                  tar                                  #
#                                                                       #
#                                                                       #
#                       Author: Ethan Smith-Coss                        #
#                            Version: 0.1.4                             #
#                    Created: 2021-05-20T16:47+0100                     #
#                 Last Modified: 2021-06-05T16:45+0100                  #
#                                                                       #
#                 ####################################                  #
#                                                                       #
#        common - Utility file with common functions for updater        #
#                   Copyright ©️ 2021 Ethan Smith-Coss                   #
#                                                                       #
# This program 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 3 of the License, or   #
#                  (at your option) any later version.                  #
#                                                                       #
#    This program is distributed in the hope that it will be useful,    #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of     #
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the     #
#             GNU General Public License for more details.              #
#                                                                       #
#   You should have received a copy of the GNU General Public License   #
# along with this program.  If not, see <http://www.gnu.org/licenses/>. #
#                                                                       #
#########################################################################

function log {
	local log_out=$(realpath "${0%/*}/.log.1")
	[[ $# -eq 0 ]] && log "ERROR" "Log function was called without any arguments. Returning 1." "$log_out" && return 1
	[[ ! $# -eq 3 ]] && log "ERROR" "Log function expected at least 3 arguments, recieved $#. Returning 1." "$log_out" && return 1
	$(echo "$(date -Iseconds) ($1): $2" >> "$3") >/dev/null 2>&1
	[[ ! $? -eq 0 ]] && log "ERROR" "Log function encountered an issue writing to \"$3\". Returning 1." "$log_out" && return 1

	return 0
}

function archive_system {
	local log_out=$(realpath "${0%/*}/.log.1")
	[[ -e $1 ]] && log "ERROR" "Archive function was called without any arguments." "$log_out"
	
	local archive_output="/tmp/microsoft-edge-autoupdater/$(echo $1 | sed 's/\//_/').tar.gz"
	[[ -f "$archive_output" ]] && return 0
	
	exit_code=$(grep 'usr/.*' "/tmp/microsoft-edge-autoupdater/Contents-amd64" | tar --overwrite -cvzf "$archive_output" "/opt/$1/" 2>>"$log_out" ; echo $?)
	[[ ! $exit_code -eq 0 ]] && { log "ERROR" "(Archive) There was an issue creating the archive file of system. Returning...(10)" "$log_out" ; return 10 ; }

	return 0
}

function restore_files {
	local log_out=$(realpath "${0%/*}/.log.1")
	[[ -e $1 ]] && log "ERROR" "Restore function was called without any arguments." "$log_out"
	local backup_file="/tmp/microsoft-edge-autoupdater/$(echo $1 | 's/\//_/').tar.gz"
	[[ -f "$backup_file" ]] && { log "ERROR" "There is no backup of Microsoft Edge (Beta) identified. Restoration not possible." "$log_out" ; return 12 ; }
	exit_code=$(tar -xvzf "$backup_file" "/" 2>>"$log_out" ; echo $?)
	[[ ! $exit_code -eq 0 ]] && { log "ERROR" "There was an issue restoring pervious files to system." \
		"The backup created will not be removed to allow for manual restoration. Returning...(12)" ; return 12 ; }

	return 0
}

function notify {
	## :@TODO: implement notification system.
	local log_out=$(realpath "${0%/*}/.log.1")
	[[ $# -eq 0 ]] && log "ERROR" "Notify function was called without any arguments. Returning 1." "$log_out" && return 1
	[[ ! $# -eq 2 ]] && log "ERROR" "Notify function expected at least 2 arguments, recieved $#. Returning 1." "$log_out" && return 1
	exit_code=$(notify-send "$1" "$2" >>"$log_out" 2>&1 ; echo $?) && tput bel
	[[ ! $exit_code -eq 0 ]] && log "ERROR" "There was an issue send a notification to the system." "$log_out"

	return 0
}