import json, os, sys, urllib.parse, urllib.request, urllib.error, http.cookiejar, ssl


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


class Client:
    def __init__(self, cfg):
        self.cfg = cfg
        self.base = str(cfg.get("server_url", "")).rstrip("/")
        ctx = _ctx(cfg)
        self.opener = urllib.request.build_opener(
            urllib.request.HTTPCookieProcessor(http.cookiejar.CookieJar()),
            urllib.request.HTTPSHandler(context=ctx) if ctx else urllib.request.HTTPSHandler(),
        )

    def login(self):
        form = urllib.parse.urlencode({
            "username": self.cfg.get("username", ""),
            "password": self.cfg.get("password", ""),
        }).encode("utf-8")
        req = urllib.request.Request(self.base + "/login.html", data=form,
                                     headers={"Content-Type": "application/x-www-form-urlencoded"}, method="POST")
        with self.opener.open(req, timeout=60) as r:
            r.read()

    def call(self, method, path, body=None):
        url = self.base + path
        data = json.dumps(body).encode("utf-8") if body is not None else None
        headers = {"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 self.opener.open(req, timeout=90) as r:
            raw = r.read()
            try:
                return json.loads(raw) if raw else {}
            except Exception:
                return {"raw": raw.decode("utf-8", "replace")}


def _run(fn):
    try:
        cfg = _cfg()
        inputs = _inputs()
        client = Client(cfg)
        client.login()
        print(json.dumps(fn(client, 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 main(client, inputs):
    limit = inputs.get("limit")
    offset = inputs.get("offset")
    filter_field = inputs.get("filter_field")
    filter_value = inputs.get("filter_value")

    filters = []
    if filter_field not in (None, "") and filter_value not in (None, ""):
        filters = [{"fieldName": filter_field, "operator": "Equals", "values": [filter_value]}]

    body = {
        "limit": int(limit) if limit not in (None, "") else 100,
        "offset": int(offset) if offset not in (None, "") else 0,
        "filters": filters,
    }

    return client.call("POST", "/rest/sensors/query", body)


_run(main)
