import json, os, sys, hmac, hashlib, ssl, datetime
import urllib.parse, urllib.request, urllib.error


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


def _sign(request_path, cfg, date):
    public_token = str(cfg.get("public_token", ""))
    private_token = str(cfg.get("private_token", "")).encode("utf-8")
    signed = request_path + "\n" + public_token + "\n" + date
    return hmac.new(private_token, signed.encode("utf-8"), hashlib.sha1).hexdigest()


def request(method, path, cfg, params=None, body=None):
    request_path = path
    if params:
        clean = {k: v for k, v in params.items() if v not in (None, "")}
        if clean:
            request_path += "?" + urllib.parse.urlencode(clean)
    date = datetime.datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%S")
    sig = _sign(request_path, cfg, date)
    url = str(cfg.get("base_url", "")).rstrip("/") + request_path
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {
        "DTAPI-Token": str(cfg.get("public_token", "")),
        "DTAPI-Date": date,
        "DTAPI-Signature": sig,
        "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=60, context=_ctx(cfg)) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def _run(fn):
    try:
        print(json.dumps(fn(_cfg(), _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(cfg, inputs):
    did = inputs.get("did")
    ip = inputs.get("ip")
    count = inputs.get("count")

    params = {"count": int(count or 50)}
    if did not in (None, ""):
        params["did"] = did
    if ip not in (None, ""):
        params["ip"] = ip

    return request("GET", "/devices", cfg, params=params)


_run(main)
