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

ARM = "https://management.azure.com"


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


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


def _token(cfg):
    url = "https://login.microsoftonline.com/" + str(cfg.get("tenant_id", "")) + "/oauth2/v2.0/token"
    form = urllib.parse.urlencode({
        "grant_type": "client_credentials",
        "client_id": str(cfg.get("client_id", "")),
        "client_secret": str(cfg.get("client_secret", "")),
        "scope": "https://management.azure.com/.default",
    }).encode("utf-8")
    req = urllib.request.Request(url, data=form, headers={"Content-Type": "application/x-www-form-urlencoded"}, 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 arm(method, path, token, api_version, body=None, params=None, full_url=None):
    url = (full_url if full_url else ARM + path)
    qp = {"api-version": api_version}
    if params:
        qp.update({k: v for k, v in params.items() if v not in (None, "")})
    url += ("&" if "?" in url else "?") + urllib.parse.urlencode(qp)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Authorization": "Bearer " + token, "Accept": "application/json"}
    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 {}


def _run(fn):
    try:
        cfg = _cfg()
        inputs = _inputs()
        token = _token(cfg)
        print(json.dumps(fn(cfg, token, 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)


sub = lambda cfg: str(cfg.get("subscription_id", ""))


def main(cfg, token, inputs):
    path = "/subscriptions/" + sub(cfg) + "/providers/Microsoft.Security/alerts"
    return arm("GET", path, token, "2022-01-01")


_run(main)