#!/usr/bin/env bash
#
# check if there is some mails in the deferred queue of postfix
# + danger color if >= 100 messages
# + warning color if >= 1 messages
#
# requirements: sudo apt install postfix

# GENERAL ###########################################################

# locale env
unset LC_ALL
export LC_MESSAGES=C

# check if module was disabled
module_disable=${module_postqueue_disable:=0}
if (($module_disable == 1)); then
    exit 1
fi

# colors
c_txt=${c_txt:="39"}
c_txt_emphase=${c_txt_emphase:="35"}
c_txt_deco=${c_txt_deco:="97"}
c_txt_invert=${c_txt_invert:="30"}
c_bg=${c_bg_sec:="47"}
c_danger=${c_danger:="31"}
c_warning=${c_warning:="33"}
c_success=${c_success:="32"}
c_title=${c_title:="${c_bg};1;${c_txt_invert}m"}

# PREPARATIONS ######################################################

# print loading message
echo -e "\nWaiting for Postqueue checks\e[5m...\e[0m"

# check if postfix is available, with qshape
if ! command -v qshape 1>/dev/null; then
    # output module header
    echo -e "\e[1A\e[${c_title} Postfix deferred queue status  \e[0m\n"
    echo -e "  no Postfix server available"
    exit 1
fi

# parse deferred messages qty with qshape
deferredcmd=$(timeout 5 qshape -b 6 deferred 2>/dev/null)

# OUTPUT ############################################################

# if qshape timeout 5sec
if [[ "$deferredcmd" == "" ]]; then
    # output module header
    echo -e "\e[1A\e[${c_title} Postfix deferred  \e[0m\n"
    echo -e "  \e[1;${c_warning}mqshape needs more than 5 sec to parse the deferred Mails list,\n  you should investigate!\e[0m"
    exit 1
fi

# if total deferred is 0
deferredtotal=$(echo -e "$deferredcmd" | grep TOTAL | awk '{print $2}')
if [[ "$deferredtotal" == "0" ]]; then
    # output module header
    echo -e "\e[1A\e[${c_title} Postfix deferred queue status  \e[0m\n"
    echo -e "  There is \e[1;${c_success}m${deferredtotal}\e[0m deferred Mails."
    exit 1
fi

# else print qshape output
# output module header
echo -e "\e[1A\e[${c_title} Postfix deferred queue status  \e[0m\n"
if [[ "$deferredtotal" -gt 100 ]]; then
    echo -e "  There is \e[1;${c_danger}m${deferredtotal}\e[0m deferred Mails in queue."
else
    echo -e "  There is \e[1;${c_warning}m${deferredtotal}\e[0m deferred Mails in queue."
fi