"""The instance-identity env vars must actually bind (CUST-WP-0067-T03).

The chart sets STATE_HUB_INSTANCE_ROLE. pydantic-settings derives the env var
from the *field name*, so a field called `instance_role` silently ignores it and
the hub reports "unknown" while the ConfigMap says "primary" — config that is
declared but never reaches what it configures, which is the entire failure this
workplan exists to close.
"""

from __future__ import annotations

import pytest

from api.config import Settings


@pytest.mark.parametrize(
    "env_name,attr,value",
    [
        ("STATE_HUB_INSTANCE_ROLE", "state_hub_instance_role", "primary"),
        ("STATE_HUB_INSTANCE_LABEL", "state_hub_instance_label", "railiance01"),
    ],
)
def test_env_var_binds_to_setting(monkeypatch, env_name, attr, value):
    monkeypatch.setenv(env_name, value)
    assert getattr(Settings(), attr) == value


def test_role_defaults_to_unknown(monkeypatch):
    """An instance that has not declared itself is not the primary."""
    monkeypatch.delenv("STATE_HUB_INSTANCE_ROLE", raising=False)
    assert Settings().state_hub_instance_role == "unknown"


def test_role_rejects_unknown_values(monkeypatch):
    monkeypatch.setenv("STATE_HUB_INSTANCE_ROLE", "authoritative")
    with pytest.raises(Exception):
        Settings()