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

API_VERSION = "2023-11-01"


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": "https://management.azure.com/.default",
    }).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 _si_base():
    cfg = _cfg()
    for key in ("subscription_id", "resource_group", "workspace_name"):
        if not str(cfg.get(key) or ""):
            raise Exception(key + " is not set")
    return ("https://management.azure.com/subscriptions/" + str(cfg["subscription_id"])
            + "/resourceGroups/" + str(cfg["resource_group"])
            + "/providers/Microsoft.OperationalInsights/workspaces/" + str(cfg["workspace_name"])
            + "/providers/Microsoft.SecurityInsights")


def request(method, path, params=None, body=None, token=None):
    url = _si_base() + path
    q = {k: str(x) for k, x in (params or {}).items() if x not in (None, "")}
    q["api-version"] = API_VERSION
    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 {}


def _normalize_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:
        dt = datetime.fromisoformat(s.replace("Z", "+00:00")).astimezone(timezone.utc)
        return dt.strftime("%Y-%m-%dT%H:%M:%SZ")
    except Exception:
        return s


def _flatten(item):
    flat = dict(item.get("properties", {}))
    flat["name"] = item.get("name")
    flat["id"] = item.get("id")
    return flat


def main():
    inputs = json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
    filt = inputs.get("filter")
    created_after = inputs.get("created_after")
    limit = inputs.get("limit") or 50

    filter_parts = []
    if filt:
        filter_parts.append(str(filt))
    if created_after:
        filter_parts.append("properties/createdTimeUtc ge " + _normalize_iso(created_after))
    filter_str = " and ".join(filter_parts) if filter_parts else None

    res = request("GET", "/incidents", params={
        "$filter": filter_str,
        "$top": limit,
        "$orderby": "properties/createdTimeUtc asc",
    })
    print(json.dumps({"result": [_flatten(i) for i in 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)