import json, os, sys, time, hmac, hashlib, base64
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 request(method, api_path, cfg, body=None):
    # api_path MUST include the leading /api/v3/... and any ?query string.
    base = str(cfg.get("base_url", "")).rstrip("/")
    url = base + api_path
    timestamp = str(int(time.time()))
    to_sign = api_path + ":" + method.upper() + ":" + timestamp
    secret = str(cfg.get("api_secret_key", "")).encode("utf-8")
    signature = base64.b64encode(hmac.new(secret, to_sign.encode("utf-8"), hashlib.sha256).digest()).decode("utf-8")
    authorization = "TC " + str(cfg.get("access_id", "")) + ":" + signature
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Authorization": authorization, "Timestamp": timestamp, "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) 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):
    path = "/api/v3/indicators?" + urllib.parse.urlencode({"resultLimit": 1})
    request("GET", path, cfg)
    return {"ok": True}


_run(main)
