#!/bin/bash
#
# Script to move focus to presentation window, press the mouse button to go to
# next slide; then revert focus back to the terminal window
# The idea is to record the time of progressing slides
# designed for laptop+projector where laptop has terminal and projector the presentation
#
section=$1
outfilecode=$2
outfile=${outfilecode}-Timing-${section}.txt
lecture=$3
startslide=$4
op="s"
# bash change-slide.bash CS ITS323Y11S2U01 Data-Communications-and-Networks 1

audioFile=${outfilecode}-Audio-${section}.flac
audioRate=44100
audioBits=16
audioChannels=1

screenFile=${outfilecode}-Screen-${section}.m4v
screenRate=2
screenSize=1024x768
screenOffset=1024,0
screenCodec=libx264
screenOptions=" -vpre lossless_ultrafast -threads 0 "

# Record the microphone audio using SoX
rec -q -r ${audioRate} -b ${audioBits} -c ${audioChannels} ${audioFile} &
audioPID=$!

# Record the screen using ffmpeg
ffmpeg -v 0 -f x11grab -r ${screenRate} -s ${screenSize} -i :0.0+${screenOffset} -sameq -vcodec ${screenCodec} ${screenOptions} ${screenFile} &
screenPID=$!

# Window ID of the terminal where script is running
termid=`xdotool getactivewindow`

pres_x=1050;
pres_y=10;

currenttime=`date +%s`;
starttime=${currenttime};
prevslide=${startslide};

function sec_to_time {
	s=$1
	if [ $s -ge 3600 ]
	then
		h=`expr $s / 3600`;
		s=`expr $s % 3600`;
	else
		h=0;
	fi
	if [ $s -ge 60 ]
	then
		m=`expr $s / 60`;
		s=`expr $s % 60`;
	else
		m=0;
	fi
	printf "%02d:%02d:%02d" $h $m $s
}

echo ${currenttime} >> ${outfile}
echo ${lecture} S 00:00:00 >> ${outfile}
echo ${lecture} ${startslide} 00:00:00 >> ${outfile}

while [ ${op} != "z" ]
do
	read -n1 op 
	currenttime=`date +%s`;
	seconds=`expr $currenttime - $starttime`;
	secs=`sec_to_time ${seconds}`

	if [ ${op} = "s" ]
	then
		echo ${lecture} F ${secs} >> ${outfile}
		read -p "Lecture Slide: " lecture startslide
		prevslide=${startslide}
		echo ${currenttime} >> ${outfile}
		echo ${lecture} S ${secs} >> ${outfile}
		echo ${lecture} ${startslide} ${secs} >> ${outfile}
		
	elif [ ${op} = "f" ]
	then
		xdotool mousemove $pres_x $pres_y
		xdotool click 1
		xdotool windowactivate $termid
		currentslide=`expr ${prevslide} + 1`;
		prevslide=${currentslide};
		echo ${lecture} ${currentslide} ${secs} >> ${outfile}
	elif [ ${op} = "b" ]
	then	
		xdotool mousemove $pres_x $pres_y
		xdotool click 3
		xdotool windowactivate $termid
		currentslide=`expr ${prevslide} - 1`;
		prevslide=${currentslide};
		echo ${lecture} ${currentslide} ${secs} >> ${outfile}
	elif [ ${op} = "r" ]
	then	
		echo ${lecture} ${currentslide} ${secs} >> ${outfile}
	elif [ ${op} = "x" ]
	then	
		read -p "Example: " example
		echo ${example} X ${secs} >> ${outfile}
	elif [ ${op} = "w" ]
	then	
		read -p "URL: " example
		echo ${example} W ${secs} >> ${outfile}
	elif [ ${op} = "z" ]
	then
		echo ${lecture} F ${secs} >> ${outfile}
		kill -INT ${audioPID}
		kill -INT ${screenPID}
		sleep 5
	else
		read -p "File: " example
		echo ${example} O ${secs} >> ${outfile}
	fi
done
exit