#!/bin/sh
# Network speed monitor with fixed-width output for waybar
# Outputs JSON with upload/download speeds padded to consistent width

INTERFACE=$(ip route | awk '/default/ {print $5; exit}')

if [ -z "$INTERFACE" ]; then
    echo '{"text": "No network", "class": "disconnected"}'
    exit 0
fi

RX1=$(cat /sys/class/net/$INTERFACE/statistics/rx_bytes)
TX1=$(cat /sys/class/net/$INTERFACE/statistics/tx_bytes)
sleep 1
RX2=$(cat /sys/class/net/$INTERFACE/statistics/rx_bytes)
TX2=$(cat /sys/class/net/$INTERFACE/statistics/tx_bytes)

RX_RATE=$((RX2 - RX1))
TX_RATE=$((TX2 - TX1))

format_speed() {
    local bytes=$1
    if [ $bytes -ge 1073741824 ]; then
        printf "%6.2f G" $(echo "scale=2; $bytes / 1073741824" | bc)
    elif [ $bytes -ge 1048576 ]; then
        printf "%6.2f M" $(echo "scale=2; $bytes / 1048576" | bc)
    elif [ $bytes -ge 1024 ]; then
        printf "%6.2f K" $(echo "scale=2; $bytes / 1024" | bc)
    else
        printf "%6d B" $bytes
    fi
}

UP=$(format_speed $TX_RATE)
DOWN=$(format_speed $RX_RATE)

# Get IP for tooltip
IP=$(ip -4 addr show $INTERFACE | awk '/inet / {print $2}')

# Check if WiFi and get SSID
SSID=""
if command -v iwgetid >/dev/null 2>&1; then
    SSID=$(iwgetid -r 2>/dev/null)
fi

if [ -n "$SSID" ]; then
    TOOLTIP="$SSID ($INTERFACE: $IP)"
else
    TOOLTIP="$INTERFACE: $IP"
fi

echo "{\"text\": \"${UP} 󰕒  ${DOWN} 󰇚\", \"tooltip\": \"$TOOLTIP\", \"class\": \"connected\"}"