#!/bin/bash

set x
set -euo pipefail
trap 'echo "[✖] Execution halted at line $LINENO. An unexpected error occurred. Please contact your nearest bash therapist." >&2' ERR

IFS=$'\n\t'

source settings.env

FAILURE_LOG="${TEST_FILE%.csv}-failures.log"

# Check if email recipient is set
if [ -z "$RECIPIENT" ]; then
  echo "[!] Please set the RECIPIENT variable in settings.env."
  exit 1
fi

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,LocalTCPUp,LocalTCPDown,LocalUDPUp,LocalUDPDown,RemoteTCPUp,RemoteTCPDown,RemoteUDPUp,RemoteUDPDown" > "$TEST_FILE"
fi

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


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

    # 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_results=""
    for ((retry=1; retry<=MAX_RETRIES; retry++)); do
        echo "    Attempting speed test (try $retry)..."
        speed_results=$(speedtest --secure --csv 2>/dev/null)

        if [[ -n "$speed_results" ]]; then
            break
        fi

        echo "    [!] Speedtest failed at $(date -Iseconds). Retrying in $RETRY_DELAY seconds..."
        sleep $RETRY_DELAY
    done

    if [[ -z "$speed_results" ]]; then
        TIMESTAMP=$(date -Iseconds)
        echo "    [!] Speedtest permanently failed at $TIMESTAMP. Skipping sample $i of test $COUNTER."

        # Optionally log failure to a sidecar file for later nerd rage
        echo "$TIMESTAMP,Test $COUNTER,Sample $i" >> "${TEST_FILE%.csv}-failures.log"

        continue  # Skip this sample
    fi


    # 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}')

    # iperf3 function
    run_iperf() {
      local target="$1"
      local mode="$2"
      local direction="$3"
      local args=("-c" "$target" "-J" "-t" "10")

      if [ "$mode" = "udp" ]; then
        args+=("-u")
      fi

      if [ "$direction" = "down" ]; then
        args+=("--reverse")
      fi

      local result
      result=$(iperf3 "${args[@]}" 2>/dev/null | jq -r '
        if .error then
          "iperf3-error"
        elif has("end") | not then
          "no-end"
        elif .end | has("sum_received") then
          .end.sum_received.bits_per_second
        elif .end | has("sum") then
          .end.sum.bits_per_second
        else
          "unexpected-format"
        end' || echo "execution-failed")

      if [[ "$result" == "iperf3-error" || "$result" == "no-end" || "$result" == "unexpected-format" || "$result" == "execution-failed" ]]; then
        echo "$(date -Iseconds),iperf $mode $direction to $target failed with '$result'" >> "$FAILURE_LOG"
        echo "0"  # Fallback value for CSV
      else
        echo "$result"
      fi
    }

    echo "    Running iperf3 tests..."

    # Run them all. These are in bits per second, convert as needed later.
    LocalTCPUp=$(run_iperf "$IPERF_LOCAL_TARGET" tcp up)
    LocalTCPDown=$(run_iperf "$IPERF_LOCAL_TARGET" tcp down)
    LocalUDPUp=$(run_iperf "$IPERF_LOCAL_TARGET" udp up)
    LocalUDPDown=$(run_iperf "$IPERF_LOCAL_TARGET" udp down)

    RemoteTCPUp=$(run_iperf "$IPERF_REMOTE_TARGET" tcp up)
    RemoteTCPDown=$(run_iperf "$IPERF_REMOTE_TARGET" tcp down)
    RemoteUDPUp=$(run_iperf "$IPERF_REMOTE_TARGET" udp up)
    RemoteUDPDown=$(run_iperf "$IPERF_REMOTE_TARGET" udp down)

    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,$LocalTCPUp,$LocalTCPDown,$LocalUDPUp,$LocalUDPDown,$RemoteTCPUp,$RemoteTCPDown,$RemoteUDPUp,$RemoteUDPDown" >> "$TEST_FILE"
  done                                                                                                                                 LocalTCPUp, LocalTCPDown, LocalUDPUp, LocalUDPDown, RemoteTCPUp, RemoteTCPDown ,RemoteUDPUp, RemoteUDPDown

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

echo "Stopping kismet..."

sudo systemctl stop kismet

# 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

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

# Final email with attachment(s)
EMAIL_BODY="The test with UID ${BOOT_ID} is complete. Please collect the probe. Data is attached."
EMAIL_SUBJECT="Test ${BOOT_ID} Complete"

# Construct list of attachments safely
ATTACHMENTS=()
if [ -f "$ENRICHED_FILE" ]; then
  ATTACHMENTS+=("$ENRICHED_FILE")
fi

if [ -f "$FAILURE_LOG" ]; then
  ATTACHMENTS+=("$FAILURE_LOG")
  echo "[+] Attaching failure log: $FAILURE_LOG"
fi

if [ -f "$SSID_METRICS_FILE" ]; then
  ATTACHMENTS+=("$SSID_METRICS_FILE")
  echo "[+] Attaching SSID metrics file: $SSID_METRICS_FILE"
fi

# Check if there's at least one file to send
if [ ${#ATTACHMENTS[@]} -eq 0 ]; then
  echo "[!] No files to attach. Email not sent."
else
  # Print attachments for debugging
  for file in "${ATTACHMENTS[@]}"; do
    echo "[DEBUG] Attaching: '$file'"
  done

  # Safely quote and attach
  ATTACHMENT_FLAGS=()
  for file in "${ATTACHMENTS[@]}"; do
    ATTACHMENT_FLAGS+=("-a" "$file")
  done

  echo "$EMAIL_BODY" | mutt -s "$EMAIL_SUBJECT" "${ATTACHMENT_FLAGS[@]}" -- "$RECIPIENT"
fi
echo "[+] Email sent to $RECIPIENT with attachments: ${ATTACHMENTS[*]}"

sudo kill $SUDO_KEEPALIVE_PID