#!/bin/sh

dev=eth0

command=$1
shift

if [[ "$command" == "sender" || "$command" == "receiver" || "$command" == "time-sender" || "$command" == "time-receiver" ]]; then
    :
else
    echo "Command should be either sender or receiver."
    exit 0;
fi

TARGET="127.0.0.1"
OUTPUT="/dev/null"
NETEM=()
PRRT=()
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -t|--target)
    if [[  "$command" == "sender" || "$command" == "time-sender" ]]; then
    PRRT+=("$1 $2")
    fi
    TARGET=("$2")
    shift
    shift
    ;;
    -w|--wireshark)
    OUTPUT=("$2")
    shift
    shift
    ;;
    -T|--threadpinning|-U)
    PRRT+=("$1")
    shift
    ;;
    -p|--port|-r|--rounds|-s|--size|-R|--rcvbuf|-S|--sndbuf|-o|--output|-a|--appdelay|-j|--appjitter)
    PRRT+=("$1 $2")
    shift
    shift
    ;;
    *)    # unknown option
    NETEM+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done

PRRT_PARAMS="${PRRT[@]}"
NETEM_PARAMS="${NETEM[@]}"

echo "Starting Wireshark."
tshark -i eth0 -w $OUTPUT.pcap &
TSHARK_PID=$!
sleep 2

start=$(date +%s.%N);
echo "Checking reachability of $TARGET."
until ping -c1 $TARGET &>/dev/null; do sleep 1; done
dur=$(echo "$(date +%s.%N) - $start" | bc);

printf "Reachable after %.6f seconds\n" $dur

if [[ "$command" == "sender" || "$command" == "time-sender" ]]; then
    echo "Delaying sender start."
else
    echo "Delaying receiver start."
fi

start=$(date +%s.%N);
echo "Running PRRT with command: \"$command $PRRT_PARAMS\" and link parameters: \"$NETEM_PARAMS\""
trap 'echo "Caught SIGINT."; echo "$(ps -a)"; killall -SIGINT $command' INT
LOG=$(/prrt/$command $PRRT_PARAMS 2>&1)
echo "Exit status: $?"
printf "$LOG\n"
dur=$(echo "$(date +%s.%N) - $start" | bc);
printf "Done after %.6f seconds\n" $dur
kill $TSHARK_PID