# Python 3, standard library only. Requires catalog:read permission.
import hashlib
import hmac
import json
import os
import secrets
import time
from urllib.error import HTTPError
from urllib.request import Request, urlopen

key = os.environ["ZYNOO_API_KEY"]
secret = os.environ["ZYNOO_API_SECRET"]
path = "/v1/plans"
timestamp = str(int(time.time()))
nonce = secrets.token_hex(18)
canonical = "\n".join([
    timestamp, nonce, "GET", path, hashlib.sha256(b"").hexdigest(), ""
])
signature = hmac.new(
    secret.encode("utf-8"), canonical.encode("utf-8"), hashlib.sha256
).hexdigest()

request = Request(
    "https://bill.zynoo.com/vps-api/index.php" + path,
    headers={
        "Accept": "application/json",
        "X-VR-Key": key,
        "X-VR-Timestamp": timestamp,
        "X-VR-Nonce": nonce,
        "X-VR-Signature-Version": "2",
        "X-VR-Signature": signature,
    },
    method="GET",
)
try:
    with urlopen(request, timeout=45) as response:
        result = json.load(response)
except HTTPError as error:
    failure = json.loads(error.read())
    raise RuntimeError(f"HTTP {error.code}: {failure['error']['code']}") from error
if not result.get("ok"):
    raise RuntimeError(result.get("error", {}).get("code", "request_failed"))

# Upsert local billing products by supplier_pid; keep every offered cycle.
products = [{
    "supplier_pid": int(plan["pid"]),
    "name": plan["name"],
    "group": plan["group"],
    "prices": plan["prices"],
    "provisioning": plan["provisioning"],
} for plan in result["plans"]]
print(json.dumps({"currency": result["currency"], "products": products},
                 indent=2, ensure_ascii=False))