#!/usr/bin/env bash
# jitter-ping: Quick ICMP RTT Jitter Benchmark in Bash
# Usage: jitter-ping <target_ip> [count] [interval_sec]

TARGET="${1:-192.168.1.104}"
COUNT="${2:-100}"
INTERVAL="${3:-0.02}" # 20ms by default (50 pkts/sec)

echo "[*] Spouštím ICMP jitter benchmark na cíl $TARGET ($COUNT paketů, interval ${INTERVAL}s)..."

# Run ping and extract rtt times
ping -c "$COUNT" -i "$INTERVAL" -q "$TARGET" | awk -F'/' '
/min\/avg\/max\/mdev/ {
    split($5, val, " ")
    min = $4
    avg = $5
    max = $6
    mdev = $7
    sub(/ .*/, "", min)
    sub(/ .*/, "", avg)
    sub(/ .*/, "", max)
    sub(/ .*/, "", mdev)
    
    printf "\n==================== ICMP RTT VÝSLEDKY ====================\n"
    printf "  Cíl:                  %s\n", "'"$TARGET"'"
    printf "  Minimální RTT:        %8.3f ms\n", min
    printf "  Průměrný RTT:         %8.3f ms\n", avg
    printf "  Maximální RTT:        %8.3f ms\n", max
    printf "  Jitter (mdev / dev):  %8.3f ms (%8.1f µs)\n", mdev, mdev * 1000.0
    printf "===========================================================\n"
}
/packets transmitted/ {
    printf "  Přenos paketů:        %s\n", $0
}
'