import json, os, sys, urllib.parse, urllib.request, urllib.error
from datetime import datetime, timezone

SCOPE = "https://api.securitycenter.microsoft.com/.default"
API = "https://api.securitycenter.microsoft.com/api"


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


def _token():
    cfg = _cfg()
    data = urllib.parse.urlencode({
        "grant_type": "client_credentials",
        "client_id": str(cfg.get("client_id") or ""),
        "client_secret": str(cfg.get("client_secret") or ""),
        "scope": SCOPE,
    }).encode("utf-8")
    url = "https://login.microsoftonline.com/" + str(cfg.get("tenant_id") or "") + "/oauth2/v2.0/token"
    req = urllib.request.Request(url, data=data,
                                 headers={"Content-Type": "application/x-www-form-urlencoded", "Accept": "application/json"},
                                 method="POST")
    with urllib.request.urlopen(req, timeout=60) as r:
        tok = json.loads(r.read())
    if not tok.get("access_token"):
        raise Exception("Token request failed: " + json.dumps(tok))
    return tok["access_token"]


def request(method, path, params=None, body=None, full_url=None, token=None):
    url = full_url or (API + path)
    q = {k: str(x) for k, x in (params or {}).items() if x not in (None, "")}
    if q:
        url += ("&" if "?" in url else "?") + urllib.parse.urlencode(q)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Accept": "application/json", "Authorization": "Bearer " + (token or _token())}
    if data is not None:
        headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=90) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


inputs = json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
quote = lambda v: urllib.parse.quote(str(v), safe="")


def _iso(s):
    s = str(s)
    if s.isdigit():
        ts = int(s)
        if ts > 10 ** 12:
            ts = ts / 1000.0
        return datetime.fromtimestamp(ts, tz=timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    try:
        return datetime.fromisoformat(s.replace("Z", "+00:00")).astimezone(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    except Exception:
        return s


def main():
    status = inputs.get("status")
    severity = inputs.get("severity")
    created_after = inputs.get("created_after")
    limit = inputs.get("limit") or 50

    parts = []
    if status:
        parts.append("status eq '" + str(status) + "'")
    if severity:
        parts.append("severity eq '" + str(severity) + "'")
    if created_after:
        parts.append("alertCreationTime ge " + _iso(created_after))
    filt = " and ".join(parts)

    res = request("GET", "/alerts", params={"$filter": filt or None, "$top": limit, "$orderby": "alertCreationTime asc"})
    print(json.dumps({"result": res.get("value", [])}))


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)
