#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2025  Michael Tremer                                          #
#                                                                             #
# 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/>.       #
#                                                                             #
###############################################################################

. /etc/sysconfig/rc
. "${rc_functions}"

# Read the IPS settings
readhash CONFIG "/var/ipfire/suricata/settings"

send_report() {
	local args=( "$@" )

	# Add the email sender
	if [ -n "${CONFIG[EMAIL_SENDER]}" ]; then
		args+=( "--email-sender=${CONFIG[EMAIL_SENDER]}" )

	# Fail if we don't have a sender
	else
		echo "${0}: Cannot send reports with EMAIL_SENDER being set" >&2
		return 2
	fi

	# Generate the report
	if ! suricata-report-generator "${args[@]}"; then
		return 1
	fi

	return 0
}

send_monthly_report() {
	# Check if we are supposed to send monthly reports
	case "${CONFIG[ENABLE_REPORT_MONTHLY]}" in
		on)
			;;
		*)
			return 0
			;;
	esac

	# Determine the last month
	local y="$(date --date="last month" +"%Y")"
	local m="$(date --date="last month" +"%m")"

	# Send the report
	send_report --year="${y}" --month="${m}" $(fetch_recipients monthly)
}

send_weekly_report() {
	# Check if we are supposed to send weekly reports
	case "${CONFIG[ENABLE_REPORT_WEEKLY]}" in
		on)
			;;
		*)
			return 0
			;;
	esac

	# Determine last week
	local y="$(date --date="last week" +"%Y")"
	local w="$(date --date="last week" +"%V")"

	# Send the report
	send_report --year="${y}" --week="${w}" $(fetch_recipients weekly)
}

# Sends a daily report for "yesterday"
send_daily_report() {
	# Check if we are supposed to send daily reports
	case "${CONFIG[ENABLE_REPORT_DAILY]}" in
		on)
			;;
		*)
			return 0
			;;
	esac

	# Determine yesterday's date
	local y="$(date --date="yesterday" +"%Y")"
	local m="$(date --date="yesterday" +"%m")"
	local d="$(date --date="yesterday" +"%d")"

	# Send the report
	send_report --year="${y}" --month="${m}" --day="${d}" $(fetch_recipients daily)
}

fetch_recipients() {
	local interval="${1}"

	local recipients="${CONFIG[EMAIL_RECIPIENTS_REPORT_${interval^^}]:-${CONFIG[EMAIL_RECIPIENTS]}}"

	# Parse this as an array
	IFS=',;' read -ra recipients <<< "${recipients}"

	# Return all recipients
	local recipient
	for recipient in ${recipients[@]}; do
		echo "--email-recipient=${recipient}"
	done

	return 0
}

main() {
	local interval="${1}"
	shift

	case "${interval}" in
		monthly)
			if ! send_monthly_report "$@"; then
				return $?
			fi
			;;

		weekly)
			if ! send_weekly_report "$@"; then
				return $?
			fi
			;;

		daily)
			if ! send_daily_report "$@"; then
				return $?
			fi
			;;
		*)
			echo "${0}: Unknown interval '${interval}'" >&2
			return 2
			;;
	esac

	return 0
}

main "$@" || exit 1