import json, os, sys, urllib.request, urllib.parse, urllib.error

PAGE = 500


def request(method, url, headers, body=None):
    data = json.dumps(body).encode("utf-8") if body is not None else None
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=60) as resp:
        raw = resp.read()
        return json.loads(raw) if raw else {}


def qs(params):
    clean = {}
    for k, v in params.items():
        if v is None or v == "" or v == []:
            continue
        clean[k] = v
    return ("?" + urllib.parse.urlencode(clean)) if clean else ""


def csv(v):
    return [x.strip() for x in str(v or "").split(",") if x.strip()]


def main():
    secrets = json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
    inputs = json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
    base = secrets.get("url", "").rstrip("/")
    headers = {
        "Authorization": "Token " + secrets.get("api_token", ""),
        "Accept": "application/json",
        "Content-Type": "application/json",
    }
    threat_id = str(inputs.get("threat_id") or "").strip()
    if not threat_id:
        raise ValueError("threat_id is required")
    max_results = int(inputs.get("max_results") or 1000)
    # Since HarfangLab merged alerts and security events, a threat's events are
    # the alerts whose threat_key is the threat id (same filter as the
    # vendor's own XSOAR integration).
    params = {
        "threat_key": threat_id,
        "ordering": "-alert_time",
        "status": ",".join(csv(inputs.get("status"))) or None,
        "level": ",".join(csv(inputs.get("level"))) or None,
        "offset": 0,
    }
    results, total = [], 0
    while len(results) < max_results:
        params["limit"] = min(PAGE, max_results - len(results))
        page = request("GET", base + "/api/data/alert/alert/Alert/" + qs(params), headers)
        batch = page.get("results") or []
        total = page.get("count", total)
        results.extend(batch)
        if not batch or not page.get("next"):
            break
        params["offset"] += len(batch)
    print(json.dumps({
        "threat_id": threat_id,
        "count": len(results),
        "total": total,
        "truncated": len(results) < total,
        "results": results,
    }))


try:
    main()
except urllib.error.HTTPError as e:
    print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
    sys.exit(1)
except Exception as e:
    print(json.dumps({"error": str(e)}))
    sys.exit(1)