#!/bin/bash
# VT-Sentinel log splitter — extracts sentinel entries into dedicated log
# Usage: bash log-splitter.sh [start|stop|status]
set -eo pipefail

GATEWAY_LOG="/tmp/openclaw/openclaw.log"
VT_LOG="/tmp/openclaw/vt-sentinel.log"
PID_FILE="/tmp/openclaw/vt-log-splitter.pid"
PATTERN="VT-Sentinel\|vt-sentinel\|vtsentinel"

start() {
    # Kill existing
    stop 2>/dev/null || true
    
    # Start tail from current end of file
    nohup tail -F "$GATEWAY_LOG" 2>/dev/null \
        | grep --line-buffered -i "$PATTERN" \
        >> "$VT_LOG" 2>/dev/null &
    echo $! > "$PID_FILE"
    echo "Started (PID $(cat $PID_FILE)), writing to $VT_LOG"
}

stop() {
    if [ -f "$PID_FILE" ]; then
        PID=$(cat "$PID_FILE")
        # Kill the tail pipeline (parent + children)
        pkill -P "$PID" 2>/dev/null || true
        kill "$PID" 2>/dev/null || true
        rm -f "$PID_FILE"
        echo "Stopped"
    else
        echo "Not running"
    fi
}

status() {
    if [ -f "$PID_FILE" ] && kill -0 "$(cat $PID_FILE)" 2>/dev/null; then
        echo "Running (PID $(cat $PID_FILE))"
        [ -f "$VT_LOG" ] && echo "Log size: $(du -h "$VT_LOG" | cut -f1), $(wc -l < "$VT_LOG") lines"
    else
        echo "Not running"
        rm -f "$PID_FILE" 2>/dev/null
    fi
}

case "${1:-start}" in
    start)  start ;;
    stop)   stop ;;
    status) status ;;
    *)      echo "Usage: $0 [start|stop|status]" ;;
esac