#!/usr/bin/env python3
"""Emit synthetic Windows Security-style JSONL events for Graylog/Filebeat testing."""
from __future__ import annotations

import argparse
import json
import random
import time
from datetime import UTC, datetime
from pathlib import Path


EVENTS = [4624, 4625, 4634, 4672, 4688]
USERS = ["alice", "bob", "svc_backup", "administrator"]
HOSTS = ["WIN-CLIENT-01", "WIN-CLIENT-02", "WIN-SRV-01"]


def event() -> dict[str, object]:
    event_id = random.choices(EVENTS, weights=[45, 25, 15, 5, 10])[0]
    failed = event_id == 4625
    return {
        "timestamp": datetime.now(UTC).isoformat(), "event_id": event_id,
        "user": random.choice(USERS), "hostname": random.choice(HOSTS),
        "source_ip": f"192.168.1.{random.randint(20, 90)}", "logon_type": random.choice([2, 3, 10]),
        "status": "failure" if failed else "success", "action": "deny" if failed else "accept",
        "event_provider": "Microsoft-Windows-Security-Auditing", "stream_hint": "Windows", "synthetic": True,
        "message": "Synthetic Windows Security event generated by SignalScope test harness",
    }


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--output", default="logs/windows-synthetic.jsonl")
    parser.add_argument("--interval", type=float, default=1.0)
    parser.add_argument("--count", type=int, default=0, help="0 runs until interrupted")
    args = parser.parse_args()
    path = Path(args.output); path.parent.mkdir(parents=True, exist_ok=True)
    emitted = 0
    with path.open("a", encoding="utf-8", buffering=1) as handle:
        while not args.count or emitted < args.count:
            handle.write(json.dumps(event()) + "\n"); emitted += 1; time.sleep(args.interval)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())
