#!/bin/bash

SCRIPT_DIRECTORY="/home/yaro/wifi_test"
RECIPIENT=conrad.nelson@nebraska.gov
NUM_TESTS=1
NUM_SAMPLES=5
TIME_BETWEEN=15m
INTERFACE=wlan0
BOOT_ID=$(cat /proc/sys/kernel/random/boot_id)
TEST_FILE="/home/yaro/${BOOT_ID}-speedtest.csv"
PING_COUNT=25
PING_TARGET=1.1.1.1
KISMET_LOG_DIR="/home/yaro/kismet_logs"
LEAD_TIME=90s

ENRICHED_FILE="${TEST_FILE%}+rf.csv"

sudo -v

while true; do sudo -n true; sleep 60; done 2>/dev/null &
SUDO_KEEPALIVE_PID=$!

echo "Starting kismet..."

sudo systemctl start kismet

echo "Saturating the capture..."

sleep $LEAD_TIME

# Function to get current TX failed count
get_tx_failed() {
  iw dev $INTERFACE station dump | awk '/tx failed/ {print $3}'
}

freq_to_channel() {
  local freq=$1
  local channel=0

  if [ "$freq" -ge 2412 ] && [ "$freq" -le 2472 ]; then
    channel=$(( (freq - 2407) / 5 ))
  elif [ "$freq" -eq 2484 ]; then
    channel=14
  elif [ "$freq" -ge 5180 ] && [ "$freq" -le 5825 ]; then
    channel=$(( (freq - 5000) / 5 ))
  else
    channel="Unknown"
  fi

  echo "$channel"
}

# Start test email
echo -e "Subject: Test ${BOOT_ID} Started\n\nThis is to inform you that the tests have commenced for test ${BOOT_ID}." | msmtp $RECIPIENT

COUNTER=0
FAILED_START=$(get_tx_failed)

# Create CSV header if needed
if [ ! -f "$TEST_FILE" ]; then
  echo "StartTimestamp,EndTimestamp,Link,Level,Noise,BSSID,TX Bitrate,RX Bitrate,$(speedtest --csv-header),TX Failures,Channel,Frequency,Packet Loss,Jitter" > "$TEST_FILE"
fi

while [ "$COUNTER" -lt "$NUM_TESTS" ]; do
  COUNTER=$((COUNTER + 1))
  echo "Executing test $COUNTER of $NUM_TESTS..."

  START_TIME=$(date -Iseconds)

  for ((i=1; i<=NUM_SAMPLES; i++)); do
    echo "    Gathering sample $i of $NUM_SAMPLES..."

    # Wireless stats
    link_level_noise=$(awk 'NR==3 {gsub(/\./, "", $3); gsub(/\./, "", $4); gsub(/\./, "", $5); print $3","$4","$5}' /proc/net/wireless)
    bssid_and_bitrate=$(iw dev $INTERFACE link | awk '/Connected/ {bssid=$3} /tx bitrate/ {tx=$3} /rx bitrate/ {rx=$3} END {print bssid","tx","rx}')

    # Speed test
    speed_results=$(speedtest --secure --csv)

    # TX failure delta
    FAILED_NOW=$(get_tx_failed)
    FAILED_DELTA=$((FAILED_NOW - FAILED_START))
    FAILED_START=$FAILED_NOW  # Update for next sample

    freq=$(iw dev $INTERFACE link | awk '/freq:/ {print $2}')
    channel=$(freq_to_channel "$freq")

    packet_loss=$(ping -c $PING_COUNT -q $PING_TARGET | grep -oP '\d+(?=% packet loss)')
    jitter=$(ping -c $PING_COUNT $PING_TARGET | grep "time=" | awk '{print $(NF-1)}' | sed 's/time=//g' | awk '{sum+=$1; sumsq+=$1*$1} END {if (NR>1) print sqrt(sumsq/NR - (sum/NR)**2); else print 0}')

    END_TIME=$(date -Iseconds)

    # Log everything
    echo "$START_TIME,$END_TIME,$link_level_noise,$bssid_and_bitrate,$speed_results,$FAILED_DELTA,$channel,$freq,$packet_loss,$jitter" >> "$TEST_FILE"
  done

  if [ "$COUNTER" -lt "$NUM_TESTS" ]; then
    echo "Dozing off for $TIME_BETWEEN..."
    sleep $TIME_BETWEEN
  fi
done

# Let's enrich the data with passive metrics.

echo "Enriching the data..."

KISMET_LOG=$(find ~/kismet_logs -type f -name "*.pcapng" -printf "%T@ %p\n" | sort -n | tail -1 | cut -d' ' -f2-)

if [ -z "$KISMET_LOG" ] || [ ! -f "$KISMET_LOG" ]; then
  echo "[!] Packet capture not found."
  exit 1
fi

echo "Stopping kismet..."

sudo systemctl stop kismet

python3 $SCRIPT_DIRECTORY/kismet_enrich_from_pcap.py --csv $TEST_FILE --pcapng "$KISMET_LOG" --output "$ENRICHED_FILE"

# Final email with attachment
echo "The test with UID ${BOOT_ID} is complete. Please collect the probe. Data is attached." | \
mutt -s "Test ${BOOT_ID} Complete" -a "$ENRICHED_FILE" -- "$RECIPIENT"

sudo kill $SUDO_KEEPALIVE_PID