#!/bin/bash

### === CONFIGURATION ===
PTP_CONF="/etc/ptp4l.conf"
LOG_FILE="/tmp/ptp4l.log"

# Optional: check if the config exists
if [[ ! -f "$PTP_CONF" ]]; then
    echo "ERROR: PTP config file not found at $PTP_CONF"
    exit 1
fi

# Extract node number from hostname, e.g., apu03 → 3
HOSTNAME=$(hostname)
NODE_ID="${HOSTNAME//[!0-9]/}"

# Check that node number is valid
if ! [[ "$NODE_ID" =~ ^[0-9]+$ ]]; then
    echo "ERROR: Could not extract valid node ID from hostname '$HOSTNAME'"
    exit 1
fi

### === SELECT INTERFACES AND MODE ===

if [[ "$NODE_ID" == "0" ]]; then
    # Node 0 is Grandmaster
    echo "[$HOSTNAME] Starting PTP4l in GRANDMASTER mode on eth2"
    CMD="ptp4l -i eth2 -m -S -f $PTP_CONF"
else
    # All other nodes are Boundary Clocks
    echo "[$HOSTNAME] Starting PTP4l in BOUNDARY CLOCK mode on eth0 and eth2"
    CMD="ptp4l -i eth0 -i eth2 -m -S -f $PTP_CONF"
fi

### === START PTP4l ===

echo "[$HOSTNAME] Running: $CMD"
$CMD > "$LOG_FILE" 2>&1 &
PTP_PID=$!

echo "[$HOSTNAME] ptp4l started with PID $PTP_PID, logging to $LOG_FILE"