#!/usr/bin/env bash 

ASCII=0

synopsis() {
	cat << EOF
Usage : `basename $0` [-h] [-a]
EOF
}

help() {
	cat << EOF

`basename $0` génère le graphe associé au réseau (graph.svgz).

`synopsis`

-h      : affiche cette aide.
-a	: ne génère pas le graphe dans le fichier mais sur stdout (en ASCII).

EOF
}

usage() {
	synopsis
	exit 1
}

args() {
	local opt
	while getopts "ha" opt; do
		case $opt in
			h) help; exit 0;;
			a) ASCII=1;;
			?) usage;;
		esac
	done
	shift $(($OPTIND - 1))
	[ $# -ne 0 ] && usage;
}

toGnuplot() {
	n=1
	echo "set term dumb"
	while read; do
		set - $REPLY
		#echo $1
		case "$1" in
			graph) scale=$2; width=$3; height=$4;;
			node) name=$2; x=$3; y=$4
				echo "set label \"[$name]\" at $x, $y"
				n=$(($n+1))
			;;

			edge) n1=$2; n2=$3; n3=$4; x1=$5; y1=$6;
				shift 10
				x2=$1; y2=$2
				echo "set arrow $n from $x1,$y1 to $x2,$y2 nohead "
				name=$3; x=$5; y=$6
				echo "set label $name\" at $x, $y"

				n=$(($n+1))
			;;
		esac
	done

	#echo "plot \"< echo '0   0'\""
	echo "set nokey"
	echo "unset tics"
	echo "unset border"
	echo "set xrange [ 0 : $width ]"
	echo "set yrange [ 0 : $height ]"

	echo "plot [0:$width] 0 with dot"

}

parse() {
	
	echo
	echo -e "\t\"$1\" [ $guestProps ]"
	ETH=0
	guest=$1
	[ "$networks" == '""'  -o -z "$networks" ] && return 0
	set - $networks
	for i; do
		#set -x
		net="$i"
		
		comment=$(echo $net | cut -d '#' -f 2)
		net=$(echo $net | cut -d '#' -f 1)
		[ "$net" = "$comment" ] && comment=""

		#net1=$(echo $net | sed -re 's/^.*NET_(.*)\(\$NET_.*\)$/\1/')

		#net1=$(echo $net | sed -re 's/\$NET_([0-9G]+).*/\1/')
		#net2=$(echo $net | sed -nre 's/.*NET_.*NET_(.*)\)$/\1/p')

		net=$(echo $net | sed -re 's/.*NET_(.*)$/\1/')

		[ "$net" = "G" ] && net=0

		#net=$(computeEthLink $GUEST_NAME $net2)
		
		#[ "$net1" = "G" ] && net1=0
		#[ "$net2" = "G" ] && net2=0
		#echo "$guest net:$net net1=$net1 net2=$net2" >&2
		#read
		
		#echo "net=$net."
		#echo "comment=$comment"
		#comment=""
		
		#net=$net1
		#[ -n "$net2" ] && net=$net2

		case "$net" in
			none) 	;;
			[0-9]*)
				set +u
				if [ -z "${switchs[$net]}" ]; then
					switchs[$net]=1
					props=$switchProps
					if [ "$net" = "0" ]; then
						props=$(echo $switchProps | sed -re 's,switch,internet,g')
						props="$props label=\"Internet\",width=\"0\",height=\"0\""
					else
						props="$props width=\"0\",height=\"0\" label=\"$net\""
					fi
					echo -e "\t$net [ $props ]"
				fi
				set -u
				echo -e "\t\"$guest\" -> $net [ taillabel=\"eth$ETH $comment\" $edgeProps ]"
			;;
			*)	error "Eth error for $guest: $net"
		esac
		ETH=$(($ETH+1))
	
		# ???	
		#[ -n "$net2" ] && {
		#	connects["$net1 -> $net2"]=1
		#}
		
		
	done
	
	

}

# main

declare -A connects

VDN_PATH=$(readlink -f $(dirname $0)/..); . $VDN_PATH/bin/functions.sh

export PATH="$VDN_PATH/bin:$PATH"

. $VDN_PATH/allocators/$VDN_RESOURCES_ALLOCATOR

args "$@"

guestProps="shape=box style=solid color=lightgray"
#switchProps="shape=ellipse color=gray fontsize=8"
#switchProps="imagepath=\"$VDN_PATH/svg\", image=\"switch.svg\",width=\"100px\",height=\"100px\",imagepos=tc,fontsize=8,shape=none"
switchProps="fontsize=12 shape=none"

edgeProps="labeldistance=4.0 len=1.8 fontsize=12 fontcolor=gray arrowhead=none"

networkDir=$NETWORK_DIR

echo "Build graph ($NETWORK_DIR/graph.svgz). "

#IDENT=0; computeNetworks

dot1=`mktemp`

#set -x

guests="`find $NETWORK_DIR -maxdepth 1 -follow -name "*.conf" | sort -R | \
        sed -re 's/^.*\/([^/]+).conf$/\1/'`"

{
	echo "digraph {"
	#echo "overlap=scale;"
	#echo 'rankdir="LR"'
	echo 'splines=true;'
	echo 'nodesep=0.1;'
	
	

	#echo '1 -> 2 [style="invis"]'
	for i in $guests; do
		#loadGuestVars $i
		unset networks
		set -a 
		GUEST_NAME=$i
		GUEST_OWNER=$USER
		. $NETWORK_DIR/$i.conf
		set +a
		networks="$NETWORKS"
		#networks=$(vdn-config $i NETWORKS)

		
		parse $i
	done
	
	for k in "${!connects[@]}"; do 
		echo "=> $k" >&2
		echo "$k [ arrowhead=none ]"
	done

	
	echo "}"
}  > $dot1


if [ $ASCII = 1 ]; then

	# obsolete

	#dot2=`mktemp`
	#plain=`mktemp`
	#gnuplot=`mktemp`

	#cat $dot1 | sed -re 's/taillabel/label/g' \
	#	> $dot2

	##graph-easy  --renderer neato --as ascii $dot2
	#graph-easy  --as ascii $dot2

	warning "ASCII = 1 is obsolete !"

	#neato -Tplain $dot2 > $plain
	#cat $plain | toGnuplot > $gnuplot

	#gnuplot $gnuplot | sed -re 's/\.//g' | sed -re 's/[<>]/\./g' \
	#    	| sed -re 's/\[/'`echo -e "\033"`'\[1m/g' \
	#    	| sed -re 's/\]/'`echo -e "\033"`'\[22m/g'

	#rm -f $dot2 $plain $gnuplot

else
	neato -Tsvg $dot1 | iconv -t UTF-8 > $NETWORK_DIR/graph.svg
	gzip $NETWORK_DIR/graph.svg
	mv $NETWORK_DIR/graph.svg.gz $NETWORK_DIR/graph.svgz
	echo "Done."

fi

#cp $dot1 /tmp/dot
rm -f $dot1