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


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
        if isinstance(v, bool):
            v = "true" if v else "false"
        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()]


# Agent fields HarfangLab exposes as exact-match query filters on
# /api/data/endpoint/Agent/. Input name == API filter name.
EXACT_FILTERS = [
    "hostname",
    "domainname",
    "domain",
    "ipaddress",
    "external_ipaddress",
    "ostype",
    "osproducttype",
    "osversion",
    "producttype",
    "version",
    "status",
    "isolation_state",
    "tenant",
]

# Convenience bounds mapped onto Django REST Framework range lookups.
RANGE_FILTERS = {
    "lastseen_after": "lastseen__gte",
    "lastseen_before": "lastseen__lte",
    "firstseen_after": "firstseen__gte",
    "firstseen_before": "firstseen__lte",
}


def to_bool(v):
    if isinstance(v, bool):
        return v
    return str(v).strip().lower() in ("true", "1", "yes")


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",
    }
    # === per-command logic ===
    filters = {}
    for field in EXACT_FILTERS:
        value = inputs.get(field)
        if value is None or value == "":
            continue
        filters[field] = to_bool(value) if field == "isolation_state" else value
    for field, lookup in RANGE_FILTERS.items():
        value = inputs.get(field)
        if value:
            filters[lookup] = value
    # Escape hatch for any filter this command does not name explicitly,
    # e.g. "groups__name=Serveurs&osmajor=10".
    for tok in str(inputs.get("filters") or "").split("&"):
        kv = tok.split("=", 1)
        if len(kv) == 2 and kv[0].strip():
            filters[kv[0].strip()] = kv[1]

    # The agent list is a DRF paginated collection: `count` is the total number
    # of matches, independent of the page size. limit=1 keeps the payload tiny.
    agents = base + "/api/data/endpoint/Agent/"
    matched = request("GET", agents + qs(dict(filters, limit=1, offset=0)), headers)
    result = {"count": matched.get("count", 0), "filters": filters}

    # The API silently drops a query parameter it does not recognise as a
    # filter, which yields the unfiltered total dressed up as a filtered count.
    # Returning the fleet total alongside makes that failure visible.
    if filters:
        everything = request("GET", agents + qs({"limit": 1, "offset": 0}), headers)
        result["total"] = everything.get("count", 0)
    else:
        result["total"] = result["count"]

    print(json.dumps(result))


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)