import base64, json, os, sys, urllib.parse, urllib.request, urllib.error


def _cfg():
    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))


def _is_cloud():
    return bool(str(_cfg().get("cloud_id") or "").strip())


def _api():
    return "3" if _is_cloud() else "2"


def _base():
    cfg = _cfg()
    root = str(cfg.get("server_url") or "https://api.atlassian.com/ex/jira").rstrip("/")
    cloud_id = str(cfg.get("cloud_id") or "").strip()
    return root + "/" + cloud_id if cloud_id else root


def _auth():
    cfg = _cfg()
    pat = str(cfg.get("pat") or "")
    if pat:
        return "Bearer " + pat
    cred = (str(cfg.get("username") or "") + ":" + str(cfg.get("api_key") or "")).encode("utf-8")
    return "Basic " + base64.b64encode(cred).decode("ascii")


def request(method, path, params=None, body=None, full_url=None, raw=False):
    url = full_url or (_base() + path)
    q = {k: str(x) for k, x in (params or {}).items() if x not in (None, "")}
    if q:
        url += ("&" if "?" in url else "?") + urllib.parse.urlencode(q)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Accept": "application/json", "Authorization": _auth()}
    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=90) as r:
        content = r.read()
        if raw:
            return content
        return json.loads(content) if content else {}


def main():
    args = json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
    limit = int(args.get("limit") or 50)
    offset = int(args.get("offset") or 0)

    res = request("GET", "/rest/api/" + _api() + "/field")
    rows = res if isinstance(res, list) else []
    sliced = rows[offset:offset + limit]

    fields = []
    for f in sliced:
        fields.append({
            "id": f.get("id") or "",
            "key": f.get("key") or "",
            "name": f.get("name") or "",
            "custom": f.get("custom"),
            "searchable": f.get("searchable"),
            "type": (f.get("schema") or {}).get("type", ""),
        })

    print(json.dumps({"total": len(rows), "fields": fields}))


try:
    main()
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)