#
#----fluxboxbg_rotate.sh - Background driver for dispbg with background image rotation
#

######################
#    DECLARATIONS    #
######################

declare -i maximages
BACKGROUND_LIST=$1
DELAY_RATE=$2


##########################
#    END DECLARATIONS    #
##########################




#######################################################################################

#########################
#    LOCAL FUNCTIONS    #
#########################


#######################################
#    FUNCTION BUILD_ROTATION_QUEUE    #
#######################################

build_rotation_queue () {

#
#----- Build or rebuild Background Image rotation queue
#

  maximages=0
  rm -vf $LOGDIR/rotation_queue
  
  if [ -f $BACKGROUND_LIST ]
  then
    echo "Found Image rotation list dispbg.rotation.list"

    for filename in `grep -v \^# $BACKGROUND_LIST`
    do
      if [ -f $filename ]
      then
        maximages=`expr $maximages + 1`
        echo "$filename" >> $LOGDIR/rotation_queue
        file $filename
        #jhead $filename
        echo "Verified background Image # $maximages <$filename>.  Added to background image queue"
      else
        echo "Background Image $filename> not found.  Ignored."
      fi # [ -f $filename ]
    done # for filename in `grep -v \^# $BACKGROUND_LIST`
  fi # [ -f $BACKGROUND_LIST ]

  echo "maximages = <$maximages>"

  if [ $maximages -gt 0 ]
  then
    echo "Total Images for queue"
  else
    echo "No Background Images found.  Continuing anyway since images can be added while looping"
  fi # [ $maximages -gt 0 ]

} # build_rotation_queue () {



####################################
#    FUNCTION CHECK_FOR_NEWLIST    #
####################################

check_for_newlist () {

  newmd5sum="`md5sum $BACKGROUND_LIST|awk '{print $1}'`"

  if [ $oldmd5sum = $newmd5sum ]
  then
    # echo "Unchanged rotation list old/new md5sum: $oldmd5sum $newmd5sum `date`"
    RC="0"
  else
    echo "Rotation list changed old/new md5sum: $oldmd5sum $newmd5sum `date`"
    build_rotation_queue
    oldmd5sum=$newmd5sum
    RC="1"
  fi # if [ $oldmd5sum = $newmd5sum ]

  return $RC

} # check_for_newlist () 



#############################
#    END LOCAL FUNCTIONS    #
#############################

###########################################################################

####################
#    BEGIN MAIN    *
####################

####################
#    INITIALIZE    #
####################

echo "Start $0 `date`"
rm -vf $LOGDIR/bgstop


build_rotation_queue 

###################
#    MAIN LOOP    #
###################


while [ ! -f $LOGDIR/bgstop ]
do


##############################################
#    BACKGROUND IMAGE ROTATION QUEUE LOOP    #
##############################################

  if [ $maximages -gt 0 ]
  then
    for background_image in `cat $LOGDIR/rotation_queue`
    do

      if [ -f $LOGDIR/bgstop ]
      then
        echo "Stop file found"
        rm -vf $LOGDIR/bgstop
        exit
      fi

      echo "Loading background image $background_image..."

      wmsetbg -s -S  $background_image
      sleep $DELAY_RATE
 
      echo "Checking for new background list"
      check_for_newlist

      if [ $RC = "1" ]
      then
        break
      fi
 
    done # background_image in `cat rotation_queue`

  else
 
    sleep 5  # Need to sleep otherwise loops too fast until 

  fi # if [ $maximages -gt 0 ]



done # while [ ! -f $LOGDIR/bgstop ]

echo "Finished $0 `date`"