import copy
import importlib.util
import json
from pathlib import Path

import pytest

spec = importlib.util.spec_from_file_location(
    'prune', Path(__file__).resolve().parents[1] / 'scripts/openbao_platform_admin_callback_prune.py')
m = importlib.util.module_from_spec(spec)
spec.loader.exec_module(m)

DECLARED = json.loads((Path(__file__).resolve().parents[1] / 'openbao/auth/netkingdom-platform-admin-role.json').read_text())


def live(role):
    state = {'role': copy.deepcopy(role)}
    writes = []

    def write(value):
        writes.append(value)
        state['role'].update(value)
    return state, writes, (lambda: copy.deepcopy(state['role'])), write


def test_prunes_only_the_two_retired_callbacks_and_keeps_settings():
    # The declaration is post-prune; re-add the retired callbacks to model the pre-prune role.
    role = dict(DECLARED, allowed_redirect_uris=list(DECLARED['allowed_redirect_uris']) + list(m.RETIRED))
    state, writes, read, write = live(role)
    changed, uris = m.prune(read, write)
    assert changed and len(writes) == 1
    assert not set(m.RETIRED) & set(uris)
    assert m.KEEP in uris and 'http://localhost:8250/oidc/callback' in uris
    assert state['role']['token_policies'] == ['platform-admin', 'operator-custody']
    assert state['role']['bound_claims'] == {'groups': ['net-kingdom-admins']}


def test_idempotent_when_already_pruned():
    role = dict(DECLARED, allowed_redirect_uris=[u for u in DECLARED['allowed_redirect_uris'] if u not in m.RETIRED])
    _, writes, read, write = live(role)
    assert m.prune(read, write)[0] is False and writes == []


def test_refuses_without_tunnel_callback():
    role = dict(DECLARED, allowed_redirect_uris=list(m.RETIRED))
    _, writes, read, write = live(role)
    with pytest.raises(m.Refused, match='tunnel_callback_missing'):
        m.prune(read, write)
    assert writes == []


def test_refuses_when_readback_drops_other_settings():
    role = dict(copy.deepcopy(DECLARED), allowed_redirect_uris=list(DECLARED['allowed_redirect_uris']) + list(m.RETIRED))
    calls = iter([copy.deepcopy(role), copy.deepcopy(role),
                  dict(copy.deepcopy(role), token_ttl=60,
                       allowed_redirect_uris=[u for u in role['allowed_redirect_uris'] if u not in m.RETIRED])])
    with pytest.raises(m.Refused, match='readback_settings_changed'):
        m.prune(lambda: next(calls), lambda value: None)