#!/bin/bash
# Transmission Health Check Script
# Monitors Transmission daemon and tracker connectivity

TELEGRAM_BOT_TOKEN="${TELEGRAM_BOT_TOKEN}"
TELEGRAM_CHAT_ID="${TELEGRAM_CHAT_ID}"

send_alert() {
    local message="$1"
    if [ -n "$TELEGRAM_BOT_TOKEN" ] && [ -n "$TELEGRAM_CHAT_ID" ]; then
        curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
            -d "chat_id=${TELEGRAM_CHAT_ID}" \
            -d "text=🚨 Transmission Alert: ${message}" \
            -d "parse_mode=HTML" > /dev/null
    fi
}

# Check if Transmission daemon is running
if ! ps aux | grep transmission-daemon | grep sc-transmission | grep -v grep > /dev/null; then
    send_alert "Transmission daemon is not running!"
    echo "ERROR: Transmission daemon is not running"
    exit 1
fi

# Check recent logs for tracker errors
LOG_FILE="/volume1/@appdata/transmission/transmission.log"
if [ -f "$LOG_FILE" ]; then
    # Count recent tracker errors (last 100 lines)
    ERROR_COUNT=$(tail -100 "$LOG_FILE" | grep -c "Announce error: Could not connect to tracker")

    if [ "$ERROR_COUNT" -gt 50 ]; then
        send_alert "High number of tracker errors detected: ${ERROR_COUNT} in recent logs"
        echo "WARNING: ${ERROR_COUNT} tracker errors found"
    fi

    # Check if log is stale (no updates in last hour)
    LOG_AGE=$(find "$LOG_FILE" -mmin +60 2>/dev/null)
    if [ -n "$LOG_AGE" ]; then
        send_alert "Transmission log hasn't been updated in over an hour - daemon may be stuck"
        echo "WARNING: Log file is stale"
    fi
fi

# Check if RPC port is listening
if ! netstat -tln 2>/dev/null | grep -q ":9091 " && ! ss -tln 2>/dev/null | grep -q ":9091 "; then
    send_alert "Transmission RPC port 9091 is not listening"
    echo "ERROR: RPC port not listening"
    exit 1
fi

echo "OK: Transmission health check passed"
exit 0