#!/bin/bash

# Parse command line options using getopt
options=$(getopt -o f:l:o:c:s:ah --long first:,last:,only:,count:,system:,all,help -- "$@")
eval set -- "$options"
LIST=""

# get node definitions
source ./node_list.sh

#all default values are according to the testbed
first_mendatory=true
last_mendatory=true
start_node=0 # default
stop_node=24 # default
current=0
system="deb" # default
login="root"
host_ip=""
all=false
ping_count=2 # default

# Function to resolve th ip of a given host
function resolveip(){
    local host="$1"
    if [ -z "$host" ];then
        host_ip="resolving failed"
    else
        local ip=$( getent hosts "$host" | awk '{print $1}' )
        if [ -z "$ip" ];then
            ip=$( dig +short "$host" )
            if [ -z "$ip" ];then
                # echo "unable to resolve '$host'" >&2
                host_ip="resolving failed"
            else
                # echo "$ip"
                host_ip=$ip
            fi
        else
            # echo "$ip"
            host_ip=$ip
        fi
    fi
}

# Function to display usage information
function display_usage {
        echo "Usage: $0 [--first <[0..84]>] [--last <[0..84]>] [--all <all 0..84>] [--only <[0..84]>] [--system <[tc/deb]>] [--help]"
}

# Function to display help information
function display_help {
        display_usage
        echo
        echo "Options:"
        echo "  --first (-f) <first node [0..84]> Set the start node (0)"
        echo "  --last (-l) <last node [0..84]> Set the stop node (24)"
		echo "  --only (-o) Only one node"
		echo "  --count (-c) Count of pings per node (2)"
		echo "  --system (-s) Define the operating system (deb)"
        echo "  --all (-a) Set all nodes"
        echo "  --help (-h) Displays help"
}

# argument parsing
while true; do
        case "$1" in
                -f|--first)
                        start_node="$2"
                        shift 2
                        ;;
                -l|--last)
                        stop_node="$2"
                        shift 2
                        ;;
				-o|--only)
						start_node="$2"
						stop_node="$2"
						shift 2
						;;
				-c|--count)
						ping_count="$2"
						shift 2
						;;
				-s|--system)
						system="$2"
						shift 2
						;;
                -a|--all)
						start_node=0
						stop_node=84
						all=true
						shift
                        ;;
                -h|--help)
                        display_help
                        exit 0
                        ;;
                --)
                        shift
                        break
                        ;;
                *)
                        display_usage
                        exit 1
                        ;;
        esac
done

# arranging node list
LIST=$(seq $start_node 1 $stop_node)

if [[ $system != "tc" && $system != "deb" ]];then
	echo "The defined operating system is unknown (tc/deb)"
	echo ""
	display_help
	exit 1
fi

if [[ $system = "tc" ]]; then
	login="tc"
fi

# check ranges
if [[ $start_node -gt 84 || $start_node -lt 0 || $stop_node -gt 84 || $stop_node -lt 0 ]];then
	echo "Nodes out of range"
	echo ""
	display_help
	exit 1
fi

echo "Pinging nodes $start_node to $stop_node with running OS $system"
echo ""

# iterate list
for i in $LIST ; do
	found=false
	# search for node in defined node list (array)
	for j in "${NODES[@]}"; do
		for k in $j; do
			#echo $j
			if [[ $i -eq $k ]]; then
				found=true
			fi
		done
	done

	if [[ $i -lt 10 ]];then
		current=0$i
	else
		current=$i
	fi

	if [ "$found" = true ]; then
		# delete node from known-host list to avoid problems when switching between deb and tc
		ssh-keygen -f "/home/apu/.ssh/known_hosts" -R "apu$current" > /dev/null 2>&1
		# get node ip
		resolveip "apu$current"
		#echo "Pinging apu$current with the IP $host_ip..."

		#ping -c $ping_count $host_ip > /dev/null 2>&1
		average_time=$(ping -c $ping_count $host_ip | awk -F'/' '/^rtt/ { print $5 }' 2>/dev/null)

		if [ $? -eq 0 ]; then
			echo "apu$current with the IP $host_ip is reachable. Average round-trip time: $average_time ms"
		else
			echo "apu$current with the IP $host_ip is not reachable"
		fi
	else
		# only inform the user about missing node defines when defining ranges by him-/herself
		if [ "$all" = false ]; then
			echo "Node apu$current not defined"
		fi
	fi
done