#!/bin/sh
#########################################################################################
# Shellscript           :       set Desktop by desktoppr
# Autor                 :       Andreas Vogel, nextenterprise gmbh
#########################################################################################
# set -x
######################### Variablen #####################################################
export PATH=/usr/bin:/bin:/usr/sbin:/sbin
picture_path="/usr/local/Desktop_background/2560x1600_Macbook_A.jpg"
loggedInUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ && ! /loginwindow/ { print $3 }' )
desktoppr="/usr/local/bin/desktoppr"

if [ ! -x "$desktoppr" ]; then
    echo "cannot find desktoppr at $desktoppr, exiting"
    exit 1
fi


# test if a user is logged in
if [ -n "$loggedInUser" ]
    then
        uid=$(id -u "$loggedInUser")    
        echo "running $desktoppr $picture_path as user"
        launchctl asuser "$uid" sudo -u "$loggedInUser" "$desktoppr" "$picture_path"
        current_picture_path=$(desktoppr)
        
        if [[ $current_picture_path != $picture_path ]]
            then
                echo "Picture Path is not correct. Try change again."
                launchctl asuser "$uid" sudo -u "$loggedInUser" "$desktoppr" "$picture_path"
            else
                echo "Picture Path is correct"
                exit 0
        fi
    else
        echo "no user logged in, no desktop set"
fi