#!/bin/sh
#----------------------------------------------------------------------------------------
# /var/install/bin/owswitch-letterbox-alert - owSwitch letterbox alert
#
# Copyright (c) 2016-2019  The Eisfair Team, team(at)eisfair(dot)org
#
# Creation:    2016-06-19  jed
# Last Update: $Id$
#
# Usage:       owswitch-letterbox-alert [options]
#
# Options:     --newletter [letterbox-index] [-resettime time-in-min]
#                                            - you got new mail, exit code: 1
#              --reset     [letterbox-index] - letterbox emptied.
#              --status    [letterbox-index] - show letterbox status.
#
#              --debug  - activate debug trace.
#              --help   - show this help.
#              --quiet  - don't show any screen output.
#
# 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.
#----------------------------------------------------------------------------------------

# read eislib
. /var/install/include/eislib
. /var/install/include/jedlib

#exec 2>/tmp/owswitch-letterbox-alert-trace-$$.log
#set -x

#----------------------------------------------------------------------------------------
# my echo
#----------------------------------------------------------------------------------------
myecho ()
{
    case $1 in
        *-std )
            _me_switch=$1
            shift
            _me_outstr="`echo "$*" | sed -r 's/^(-)?-std //g'`"
            ;;
        *-info )
            _me_switch=$1
            shift
            _me_outstr="`echo "$*" | sed -r 's/^(-)?-info //g'`"
            ;;
        *-warn )
            _me_switch=$1
            shift
            _me_outstr="`echo "$*" | sed -r 's/^(-)?-warn //g'`"
            ;;
        *-error )
            _me_switch=$1
            shift
            _me_outstr="`echo "$*" | sed -r 's/^(-)?-error //g'`"
            ;;
        * )
            _me_switch=''
            _me_outstr="$*"
            ;;
    esac

    if [ "${verbose}" = 'true' ]
    then
        # be verbose
        mecho ${_me_switch} "${_me_outstr}"
    fi
}

#----------------------------------------------------------------------------------------
# show help
#----------------------------------------------------------------------------------------
show_help ()
{
    # show help
    echo
    echo "Usage:"
    echo "  ${pgmname} [options]"
    echo '      --newletter [letterbox-index] [-resettime time-in-min] - you got new mail, exit code: 1'
    echo '      --reset     [letterbox-index] - letterbox emptied.'
    echo '      --status    [letterbox-index] - show letterbox status.'
    echo
    echo '      --debug  - activate debug trace.'
    echo '      --help   - show this help.'
    echo "      --quiet  - don't show any screen output."
    echo
}

#========================================================================================
# main
#========================================================================================

module_name='owswitch'
pgmname=`basename $0`
owswitchrunpath=/var/lib/${module_name}

cmd=''
letterbox_nbr=1
letterbox_str=''
letterbox_resettime=0
debug_trace=false
verbose=true

while [ $# -ge 1 ]
do
    case $1 in
        --debug )
            debug_trace=true
            shift
            ;;
        --help|-h|--? )
            cmd=help
            shift
            ;;
        --newletter )
            cmd=newletter
            if `is_numeric "$2"`
            then
                letterbox_nbr=$2
                letterbox_str="$2 "
                shift
            fi
            shift
            ;;
        *-resettime )
            if `is_numeric "$2"`
            then
                letterbox_resettime=$2
                shift
            fi
            shift
            ;;
        --reset )
            cmd=reset
            if `is_numeric "$2"`
            then
                letterbox_nbr=$2
                letterbox_str="$2 "
                shift
            fi
            shift
            ;;
        --status )
            cmd=status
            if `is_numeric "$2"`
            then
                letterbox_nbr=$2
                letterbox_str="$2 "
                shift
            fi
            shift
            ;;
        --quiet )
            verbose=false
            shift
            ;;
        * )
            shift
            ;;
    esac
done

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

cmdfile=${owswitchrunpath}/${module_name}-cmd-letterbox-${letterbox_nbr}.alert

exit_code=0
case ${cmd} in
    help )
        show_help
        ;;
    newletter )
        if [ -f ${cmdfile} ]
        then
            # show status
            myecho "letterbox ${letterbox_str}contains new mail (`date +'%Y-%m-%d %H:%Mh' -r ${cmdfile}`)"
        else
            # letterbox flap opened -> new letters arrived
            touch ${cmdfile}
            myecho "letterbox ${letterbox_str}contains new mail (`date +'%Y-%m-%d %H:%Mh' -r ${cmdfile}`)"
            /usr/bin/logger -p "local0.info" -t "owswitch" "letterbox ${letterbox_str}contains new mail!"

            if [ ${letterbox_resettime} -gt 0 ]
            then
                # set auto-reset of letterbox status
                atjob_tmp_file=`/bin/mktemp -t owswitch-letterbox-alert-job-XXXXXXXXXX`
                echo "`realpath $0` --quiet --reset" | at now + ${letterbox_resettime}min >> ${atjob_tmp_file} 2>> ${atjob_tmp_file}
                atjob_nbr=`sed -e '/^job .* at/!d' -e 's/^job //' -e 's/ at.*$//' ${atjob_tmp_file}`
                rm -f ${atjob_tmp_file}

                /usr/bin/logger -p "local0.info" -t "owswitch" "letterbox reset time: ${letterbox_resettime}min (job ${atjob_nbr})."
            fi
        fi
        exit_code=1
        ;;
    reset )
        if [ -f ${cmdfile} ]
        then
            # letterbox door opened -> letters removed
            rm -f ${cmdfile}
            myecho "letterbox emptied"
            /usr/bin/logger -p "local0.info" -t "owswitch" "letterbox ${letterbox_str}emptied."
        else
            # show status
            myecho "the letterbox ${letterbox_str}is currently empty."
        fi
        ;;
    status )
        if [ -f ${cmdfile} ]
        then
            myecho "the letterbox ${letterbox_str}contains new letter(s) (`date +'%Y-%m-%d %H:%Mh' -r ${cmdfile}`)"
        else
            myecho "the letterbox ${letterbox_str}is currently empty."
        fi
        ;;
esac

#========================================================================================
# end
#========================================================================================
exit ${exit_code}