#!/bin/sh
# send mail script for adblock notifications
# Copyright (c) 2015-2025 Dirk Brenken (dev@brenken.org)
# This is free software, licensed under the GNU General Public License v3.

# Please note: you have to manually install and configure the package 'msmtp' before using this script

# set (s)hellcheck exceptions
# shellcheck disable=all

[ -r "/usr/bin/adblock.sh" ] && . "/usr/bin/adblock.sh" "mail"

adb_debug="$(uci_get adblock global adb_debug "0")"
adb_mailsender="$(uci_get adblock global adb_mailsender "no-reply@adblock")"
adb_mailreceiver="$(uci_get adblock global adb_mailreceiver)"
adb_mailtopic="$(uci_get adblock global adb_mailtopic "adblock notification")"
adb_mailprofile="$(uci_get adblock global adb_mailprofile "adb_notify")"

[ -z "${adb_mailreceiver}" ] && f_log "err" "please set the mail receiver with the 'adb_mailreceiver' option"
[ "${adb_debug}" = "1" ] && debug="--debug"

adb_mailhead="From: ${adb_mailsender}\nTo: ${adb_mailreceiver}\nSubject: ${adb_mailtopic}\nReply-to: ${adb_mailsender}\nMime-Version: 1.0\nContent-Type: text/html;charset=utf-8\nContent-Disposition: inline\n\n"

# info preparation
#
sys_info="$("${adb_catcmd}" /etc/banner 2>/dev/null; "${adb_ubuscmd}" call system board | "${adb_awkcmd}" 'BEGIN{FS="[{}\"]"}{if($2=="kernel"||$2=="hostname"||$2=="system"||$2=="model"||$2=="description")printf "  + %-12s: %s\n",$2,$4}' 2>/dev/null)"
adb_info="$(/etc/init.d/adblock status 2>/dev/null)"
rep_info="${1}"
if [ -x "${adb_logreadcmd}" ]; then
	log_info="$("${adb_logreadcmd}" -l 100 -e "adblock-" | "${adb_awkcmd}" '{NR=1;max=120;if(length($0)>max+1)while($0){if(NR==1){print substr($0,1,max)}else{print substr($0,1,max)}{$0=substr($0,max+1);NR=NR+1}}else print}')"
fi

# mail body
#
adb_mailtext="<html><body><pre style='display:block;font-family:monospace;font-size:1rem;padding:20;background-color:#f3eee5;white-space:pre'>"
adb_mailtext="${adb_mailtext}\n<strong>++\n++ System Information ++\n++</strong>\n${sys_info}"
adb_mailtext="${adb_mailtext}\n\n<strong>++\n++ Adblock Information ++\n++</strong>\n${adb_info}"
if [ -n "${rep_info}" ]; then
	adb_mailtext="${adb_mailtext}\n\n<strong>++\n++ Report Information ++\n++</strong>\n${rep_info}"
fi
adb_mailtext="${adb_mailtext}\n\n<strong>++\n++ Logfile Information ++\n++</strong>\n${log_info}"
adb_mailtext="${adb_mailtext}</pre></body></html>"

# send mail
#
if [ -x "${adb_mailcmd}" ]; then
	printf "%b" "${adb_mailhead}${adb_mailtext}" 2>/dev/null | "${adb_mailcmd}" ${debug} -a "${adb_mailprofile}" "${adb_mailreceiver}" >/dev/null 2>&1
	f_log "info" "mail sent to '${adb_mailreceiver}' with rc '${?}'"
else
	f_log "err" "msmtp mail daemon not found"
fi
