#!/usr/bin/sh
#----------------------------------------------------------------------------------
# /var/install/bin/lprng_power-queue-control - view log file
#
# Copyright (c) 2010-2024  The Eisfair Team, team(at)eisfair(dot)org
#
# Creation:     2018-06-08  jed
# Last Update:  $Id$
#
# 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 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------------

# debug mode: true/false
#debug=true
if ${debug:-false}
then
    exec 2>/tmp/$(basename ${0})-trace$$.log
    set -x
    ask_debug=true
    export ask_debug
fi

config_file=/etc/config.d/lprng_power
stop_file=/var/run/lprng_power.stop

interval=30

if [ -f ${config_file} ]
then
    # load configuration
    . ${config_file}

    # start control process
    if [ "${START_LPRNG_POWER}" = 'yes' ]
    then
        rm -f ${stop_file}

        # check if an active configuration exists
        queue_list=''
        idx=1
        while [ ${idx} -le ${LPRNG_POWER_N} ]
        do
            eval active='$LPRNG_POWER_'${idx}'_ACTIVE'

            if [ "${active}" = 'yes' ]
            then
                eval queue='$LPRNG_POWER_'${idx}'_PRINTER_CAPNAME'

                lpq -P${queue} | grep -q "ERROR:"

                if [ $? -ne 0 ]
                then
                    if [ -z "${queue_list}" ]
                    then
                        queue_list="${queue}"
                    else
                        queue_list="${queue_list} ${queue}"
                    fi
                fi
            fi

            idx=`expr ${idx} + 1`
        done

        if [ -n "${queue_list}" ]
        then
            # active queues exist
            while [ 1 ]
            do
                {
                    # check if stop of process has been requested
                    if [ -f ${stop_file} ]
                    then
                        # exit loop
                        rm -f ${stop_file}
                        exit 0
                    fi

                    for LPQ in ${queue_list}
                    do
                        # 1. get queue status
                        # 2. remove all control characters from output, see
                        #    http://www.lprng.com/PrintingCookbook/#RF1179COMMANDS
                        # 3. revert line order
                        # 4. grep all lines form the beginning until the first match
                        # 5. remove matching and empty lines
                        job_log=`lpq -P${LPQ} | tr -d '\000-\007\008\009'  |
                                     tac | awk '1; /job .* removed at/{exit}' |
                                     grep -E -v "job .* removed at|^[ \t]*$"`

                        if [ -n "${job_log}" ]
                        then
                            # Status: opening device '/dev/usb/lp1' at 23:42:38.564
                            device_path=`echo "${job_log}" | grep "Status: opening device" | sed 's#^.* device .\(.*\). at.*#\1#'`

                            # Status: cannot open '/dev/usb/lp1' - 'No such file or directory'
                            # Status: cannot open '192.168.1.104%9100' - 'Connection refused'
                            echo "${job_log}" | grep -E -i -q "Status: cannot open .${device_path}.*No such file or directory|Status: cannot open .*Connection refused"

                            if [ $? -eq 0 ]
                            then
                                # 'cannot open' message found, force switch-on of device
                                /usr/bin/lprng_power-access --queue ${LPQ} --on-autooff
                            fi
                        fi
                    done
                } > /dev/null

                sleep ${interval}
            done &
        fi
    fi
fi