#!/bin/bash

#export DISPLAY=:0.0
echo "DISPLAY:$DISPLAY"

Dir="~/img/wallpap/1920x1200/"
wallpaplist="~/.wallpaplist"
contact="n@tourmentine.com"

if [ ! -d "$Dir" ];
then
    echo "${Dir} does not exist"
    exit 1
fi

if [ ! -f ${wallpaplist} ];
then
        touch ${wallpaplist}
fi

while true; do
AvailableFiles=`ls -1 ${Dir} | wc -l`
AlreadyViewedFiles=`cat ${wallpaplist} | wc -l`

TotalFiles=`expr $AvailableFiles - $AlreadyViewedFiles`

if [ $TotalFiles -lt 1 ];
then
        echo "*** Seems we have displayed all available wallpapers; let's do the time warp...again. ***"
        echo ""> ${wallpaplist}
	echo "" | /usr/bin/mail -s "Seems we have displayed all available wallpapers; let's do the time warp...again." ${contact}
        TotalFiles=$AvailableFiles
fi

RandomNumber=$(( $RANDOM % $TotalFiles ))
test ! $RandomNumber = 0 || RandomNumber=1

RandomFile="$( ls -1 ${Dir} | grep -w -v -F -f ${wallpaplist} | head -n $RandomNumber | tail -n 1)"
if [[ ${RandomFile} == "" ]];
then
        echo "*** Oops, something went wrong. erasing cache for security ***"
        echo ""> ${wallpaplist}
	echo "" | /usr/bin/mail -s "Oops, something went wrong. erasing cache for security" ${contact}
        exit 1
else
        echo "${RandomFile}" >> ${wallpaplist}
fi

if [ -z "${DBUS_SESSION_BUS_ADDRESS}" ] ; then
        . ${HOME}/.dbus/session-bus/`ls -rt ${HOME}/.dbus/session-bus/ | tail -1`
        export DBUS_SESSION_BUS_ADDRESS DBUS_SESSION_BUS_PID
fi

#echo ${DBUS_SESSION_BUS_ADDRESS}

echo "" | /usr/bin/mail -s "New wallpaper: ${RandomFile}" ${contact}
echo "Selected File: $RandomFile"
xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path -s "${Dir%/}/${RandomFile}"
xfconf-query -c xfce4-desktop -v -p /backdrop/screen0/monitor0/last-image -s "${Dir%/}/${RandomFile}"
xfconf-query -c xfce4-desktop -v -p /backdrop/screen0/monitorVGA1/workspace0/last-image -s "${Dir%/}/${RandomFile}"
xfconf-query -c xfce4-desktop -v -p /backdrop/screen0/monitor0/workspace0/last-image -s "${Dir%/}/${RandomFile}"
pkill gkrellm && gkrellm &
# 3 hours
sleep 10800
done