#!/bin/bash

TMPFILE_BASE=/tmp/light_state
TMPFILE_CUSTOM_BASE=/tmp/light_state_custom
ROOM_NUMBER="$1"
COLOR="$2"

ROOM_COUNT=3
DFAULT_LIGHT_STATE=0
STATE_0="a\x00\x03\x00\x00\x00|000000000000000000;\
	000000000000000000;\
	000000000000000000"
STATE_1="a\x00\x03\xff\xff\xff|255255255255255255;\
	000000000000000000;\
	000000000000000000"
STATE_2="n\x00\x02\x01\x00|170000070150000050;\
	000000000000000000;\
	000000000000000000"

get_room_color_string() {
case "$ROOM_NUMBER" in
	1)
	  COLOR_A="$(echo "$COLOR" | sed "s/\(..\)\(..\)\(..\)/\\\x\2\\\x\1\\\x\3/g")"
	  COLOR_B="$(echo "$COLOR" | while read -N2 code; do printf "%03d" $((16#$code)); done)"
	  echo "a\x00\x03$COLOR_A|$COLOR_B$COLOR_B"
	  ;;
	2)
	  echo ""
	  ;;
	3)
	  echo ""
	  ;;
	*)
	  echo "ERROR: wrong room number, internal problem detected" >&1
	  exit 1
	  ;;
esac
}

set_room_color() {
case "$ROOM_NUMBER" in
	1)
	  echo -en "$(echo "$STATE" | cut -d";" -f1 | cut -d"|" -f1)" > /dev/udp/172.23.92.15/49152 &
	  echo -en "$(echo "$STATE" | cut -d";" -f1 | cut -d"|" -f2)" > /dev/udp/172.23.92.16/31302 &
	  ;;
	2)
	  # echo -en "$(echo "$STATE" | cut -d";" -f2 | cut -d"|" -f1)" > /dev/null
	  # echo -en "$(echo "$STATE" | cut -d";" -f2 | cut -d"|" -f2)" > /dev/null 
	  echo "not implemented" >&1
	  exit 1
	  ;;
	3)
	  # echo -en "$(echo "$STATE" | cut -d";" -f3 | cut -d"|" -f1)" > /dev/null
	  # echo -en "$(echo "$STATE" | cut -d";" -f3 | cut -d"|" -f2)" > /dev/null
	  echo "not implemented" >&1
	  exit 1
	  ;;
	*)
	  echo "ERROR: wrong room number, internal problem detected" >&1
	  exit 1
	  ;;
esac
}

if ! [[ "$ROOM_NUMBER" =~ ^[0-9]+$ ]] || ! [ "$ROOM_NUMBER" -gt 0 -a "$ROOM_NUMBER" -le "$ROOM_COUNT" ]; then
	echo "ERROR: please specify a valid room number" >&1
	exit 1
fi

touch "${TMPFILE_BASE}_$ROOM_NUMBER"
LIGHT_STATE=$(cat "${TMPFILE_BASE}_$ROOM_NUMBER")
[ -z "$LIGHT_STATE" ] && LIGHT_STATE=$DFAULT_LIGHT_STATE

if [ -z "$COLOR" ]; then
	if ! [ -f "${TMPFILE_CUSTOM_BASE}_$ROOM_NUMBER" ]; then		# restore previous colour
		LIGHT_STATE=$(( $LIGHT_STATE+1 ))
	else
		rm -f "${TMPFILE_CUSTOM_BASE}_$ROOM_NUMBER"
	fi
	case $LIGHT_STATE in
		0)
		  STATE=$STATE_0
		  ;;
		1)
		  STATE=$STATE_1
		  ;;
		2)
		  STATE=$STATE_2
		  ;;
		*)
		  STATE=$STATE_0
		  LIGHT_STATE=0
		  ;;
	esac
else
	STATE="$(get_room_color_string)"
	touch "${TMPFILE_CUSTOM_BASE}_$ROOM_NUMBER"
fi

for i in {1..5}; do
	set_room_color
	sleep .01
done

echo $LIGHT_STATE > "${TMPFILE_BASE}_$ROOM_NUMBER"