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#!/usr/bin/bash
# SJP 30 Dec 2015
#
# Copy and process photos from a cam-equipped raspi
########### Constants ##################
# campi="neatherd" # hard-code source hostname for the moment
wanWebServer="f3rr3t.com"
sourcedir="/home/st33v/pix" # where the image is on the source computer (i.e. $campi)
thisdir="/home/st33v/cams" # this directory (on this computer)
threshold="2000" # minimum value of average pixel brightness. Tests if pic is too dark
########### end Consts ################
# cam names in an array:
declare -a camz=(neatherd lucerne)
########### Functions ##################
# get the filename of the most recent photo stored on this computer.
newestpicfunc () { newestpic=$(ls "$campi"/*.jpg -t | head -1); }
########### end Funcs #################
cd ${thisdir}
for campi in "${camz[@]}"
do
# record the latest photo BEFORE we look for a new one
# newestpicfunc; oldpic=${newestpic}
# echo "Before: oldpic is ${oldpic}"
# Copy any photos from the camera-equipped source ($campi)
# This script is on a rapid timer so there should only ever be one photo (if any).
# scp ${campi}:${sourcedir}/*.jpg ${campi}/. 2>/dev/null
# Delete the photo from the source computer.
# ssh $campi "rm ${sourcedir}/*.jpg" 2>/dev/null
# cp ${oldpic} ${thisdir}${campi}/zzz.jpg # testing
# get the filename of the NEW photo, it there is one
# newestpicfunc; newpic="$newestpic"
# echo "After: newpic is ${newpic}"
#if [[ "$oldpic" == "$newpic" ]] ; then
# echo no new photos so exit now
#exit 0
# continue
# fi
# NeatHerd doesn't have enough RAM to perform image processing, so let's try it on STAN
# Check to see if the pic is too dark (i.e. taken at night)
mean=$(identify -format %[mean] ${newpic} | sed s/[.].*//)
# echo "mean is $mean"
# too dark (nighttime)
if [[ "${mean}" -lt "${threshold}" ]] ; then
rm $newpic
# echo mean of $mean is too low. It is nighttime.
continue
fi
# Improve sharpness and resize photo, ready for upload to webserver
# Break into two steps to avoid out-of-memory errors (OS kills process)
convert ${newpic} -unsharp 1.5x1+0.7+0.02 temp.jpg
convert temp.jpg -resize 33% -quality 70 ${newpic}
rm temp.jpg
# upload latest pic to web server
echo "/home/st33v/cams/$newpic"
echo "$wanWebServer:/home/st33v/farm/cam/$campi/"
scp /home/st33v/cams/$newpic $wanWebServer:/home/st33v/farm/cam/$campi/.
# bump parent directory to provoke path service
touch bump.txt
scp bump.txt $wanWebServer:/home/st33v/farm/cam/.
done
#exit(0) # force success exit code for fussy systemd
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