pre_upgrade() {
    echo "Stopping HylaFAX+ services"
    systemctl stop hfaxd.service faxq.service "faxgetty@*.service" || true
}

post_upgrade() {
    echo "Starting enabled HylaFAX+ services"
    systemctl daemon-reload
    systemctl reset-failed "faxgetty@*" hfaxd faxq 2>/dev/null || true
    local _svcs=$(systemctl list-units --all | \
                    awk '/^[[:space:]]*faxgetty@/ { print $1 }')
    _svcs="$_svcs hfaxd faxq"
    for s in $_svcs; do
        systemctl is-enabled "$s" >/dev/null && \
            systemctl start "$s" || true
    done
}

pre_remove() {
    pre_upgrade
    echo "Stopping and disabling HylaFAX+ services and timers"
    systemctl stop faxqclean.timer faxcron.timer
    systemctl disable hfaxd.service faxq.service faxqclean.timer faxcron.timer
    local _svcs=$(systemctl list-units --all | \
                    awk '/^[[:space:]]*faxgetty@/ { print $1 }')
    for s in $_svcs; do
        systemctl is-enabled "$s" >/dev/null && \
            systemctl disable "$s" || true
    done
    rm -f /opt/hylafax/spool/FIFO*
}

post_remove() {
    echo "Deleting user and group hylafax"
    usermod -G "" hylafax || true
    userdel hylafax || true
    groupdel hylafax 2>/dev/null || true
    echo "Any remaining data in /opt/hylafax have to be deleted manually."
}

post_install() {
    cat << EOF

Here are some tasks left to you to finish your setup:

- The default page size is A4, you can change this in
    /opt/hylafax/spool/etc/pagesizes

- Configure some modems in /opt/hylafax/spool/etc
    Example: config.ttyIAX0 config.ttyIAX1

- For SSL faxing, create X.509 certificate with key as
  file ssl.pem in /opt/hylafax/spool/etc

- Add Fax{Notify,Dispatch,Wedged} in /opt/hylafax/spool/etc

- Enable and start faxgetty named instances:
    systemctl enable faxgetty@ttyIAX0.service faxgetty@ttyIAX1.service
    systemctl start faxgetty@ttyIAX0.service faxgetty@ttyIAX1.service

- Enable and start faxq hfaxd service, faxqclean and faxcron timer
    systemctl enable faxq.service hfaxd.service faxqclean.timer faxcron.timer
    systemctl start faxq.service hfaxd.service faxqclean.timer faxcron.timer

- Check http://hylafax.sourceforge.net/howto/tweaking.php
  for more tweaking tips

EOF
}