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

BASE = "https://services.nvd.nist.gov/rest/json/cves/2.0"


def _cfg():
    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))


def _inputs():
    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))


def _ctx(cfg):
    if cfg.get("insecure"):
        c = ssl.create_default_context()
        c.check_hostname = False
        c.verify_mode = ssl.CERT_NONE
        return c
    return None


def _headers(cfg):
    h = {"User-Agent": "Riposte-SOAR", "Accept": "application/json"}
    k = cfg.get("api_key")
    if k:
        h["apiKey"] = str(k)
    return h


def _get(url, cfg):
    req = urllib.request.Request(url, headers=_headers(cfg))
    with urllib.request.urlopen(req, timeout=120, context=_ctx(cfg)) as r:
        return r.read()


def _run(fn):
    try:
        print(json.dumps(fn(_cfg(), _inputs())))
    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)


def _cvss(metrics):
    for key in ("cvssMetricV31", "cvssMetricV30", "cvssMetricV2"):
        arr = metrics.get(key)
        if arr and isinstance(arr, list) and isinstance(arr[0], dict):
            d = arr[0].get("cvssData", {})
            return d.get("baseScore"), d.get("baseSeverity") or arr[0].get("baseSeverity")
    return None, None


def main(cfg, inputs):
    days = int(inputs.get("days") or cfg.get("days") or 7)
    days = max(1, min(days, 120))

    end = datetime.datetime.now(datetime.timezone.utc)
    start = end - datetime.timedelta(days=days)
    fmt = "%Y-%m-%dT%H:%M:%S.000"

    per = int(inputs.get("max_indicators") or 0) or 2000
    per = max(1, min(per, 2000))

    params = {
        "pubStartDate": start.strftime(fmt),
        "pubEndDate": end.strftime(fmt),
        "resultsPerPage": per,
    }
    url = BASE + "?" + urllib.parse.urlencode(params)
    raw = _get(url, cfg)
    data = json.loads(raw) if raw else {}

    maxn = int(inputs.get("max_indicators") or 0)
    out = []
    for v in data.get("vulnerabilities", []):
        cve = v.get("cve", {}) if isinstance(v, dict) else {}
        cid = cve.get("id")
        if not cid:
            continue
        desc = ""
        for d in cve.get("descriptions", []):
            if d.get("lang") == "en":
                desc = d.get("value")
                break
        score, severity = _cvss(cve.get("metrics", {}))
        out.append({
            "value": cid,
            "type": "cve",
            "description": desc,
            "cvss": score,
            "severity": severity,
            "published": cve.get("published"),
            "status": cve.get("vulnStatus"),
        })
        if maxn and len(out) >= maxn:
            break

    return {
        "source": "nvd:recent",
        "count": len(out),
        "indicators": out,
        "total_results": data.get("totalResults"),
    }


_run(main)