import os
from typing import List, Optional, Tuple

from kubernetes import client, config

OIDC_USERS_NAMESPACE = os.environ["OIDC_USERS_NAMESPACE"]

_config_loaded = False


def _ensure_config():
    """Load in-cluster Kubernetes config exactly once (lazy, cached)."""
    global _config_loaded
    if not _config_loaded:
        config.load_incluster_config()
        _config_loaded = True


def groupsToFullName(groups) -> List[str]:
    fullName: List[str] = []

    for group in groups:
        fullName.append(
            group.get("prefix", "") + ":" + group.get("name", "")
        )

    return fullName


def _get_users() -> list:
    """Return all OIDC user items from the Kubernetes API."""
    _ensure_config()
    api_instance = client.CustomObjectsApi()
    ret = api_instance.list_namespaced_custom_object(
        "codemowers.cloud", "v1beta1", OIDC_USERS_NAMESPACE, "oidcusers"
    )
    return ret["items"]


def users_with_group(requiredGroup: str) -> List[str]:
    users: List[str] = []

    for item in _get_users():
        for group in groupsToFullName(item.get("status", {}).get("groups", [])):
            if group == requiredGroup:
                users.append(item["metadata"]["name"])
                continue

    print(f"INFO: {len(users)} users in group {requiredGroup}")
    return users


# -> (groups[], username)
def by_slackid(slack_id: str) -> Tuple[List[str], Optional[str]]:
    for item in _get_users():
        if slack_id == item.get("status", {}).get("slackId", None):
            return groupsToFullName(item.get("status", {}).get("groups", [])), item.get("metadata", {}).get("name", "")

    return [], None