# Python 3; standard library only.
import json
import os
import sys
from urllib.error import HTTPError, URLError
from urllib.parse import quote, urlencode
from urllib.request import HTTPRedirectHandler, Request, build_opener

def env(name):
    result = os.environ.get(name)
    if not result:
        raise ValueError("Set " + name)
    return result

class NoRedirect(HTTPRedirectHandler):
    def redirect_request(self, req, fp, code, msg, headers, newurl):
        return None

try:
    path = "/v1/invoices"

    query = {

    }
    url = "https://api.cryptanio.com" + path + ("?" + urlencode(query) if query else "")
    headers = {
        "Authorization": "Bearer " + env("CRYPTANIO_API_KEY"),
        "Accept": "application/json",
        "Content-Type": "application/json",
        "Idempotency-Key": env("CRYPTANIO_OPERATION_ID"),
    }
    body = json.loads("{\"project\":\"2002\",\"invoice_currency\":\"USD\",\"invoice_amount\":\"12.50\",\"reference\":\"order-42\"}")
    body["project"] = env("CRYPTANIO_PROJECT_ID")
    data = json.dumps(body).encode("utf-8")
    request = Request(url, data=data, headers=headers, method="POST")
    with build_opener(NoRedirect()).open(request, timeout=30) as response:
        if not 200 <= response.status < 300:
            raise ValueError("HTTP " + str(response.status))
        sys.stdout.buffer.write(response.read())
except HTTPError as error:
    print("HTTP " + str(error.code) + ": " + error.read().decode("utf-8", errors="replace"), file=sys.stderr)
    sys.exit(1)
except (ValueError, URLError, OSError) as error:
    print(str(error), file=sys.stderr)
    sys.exit(1)