import json, os, sys, 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 _base(cfg):
    region = str(cfg.get("region") or "US").strip().upper()
    return "https://api.eu.opsgenie.com" if region == "EU" else "https://api.opsgenie.com"


def request(method, path, cfg, body=None, params=None):
    url = _base(cfg) + path
    if params:
        clean = {k: v for k, v in params.items() if v not in (None, "")}
        if clean:
            url += "?" + urllib.parse.urlencode(clean)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Authorization": "GenieKey " + str(cfg.get("api_key", "")), "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):
    schedule_identifier = str(inputs.get("schedule_identifier") or "").strip()
    if not schedule_identifier:
        raise Exception("schedule_identifier is required")
    identifier_type = str(inputs.get("identifier_type") or "id").strip() or "id"

    path = "/v2/schedules/" + urllib.parse.quote(schedule_identifier, safe="") + "/on-calls"
    params = {"scheduleIdentifierType": identifier_type}

    return request("GET", path, cfg, params=params)


_run(main)