import json
import pytest
from app.services.remnawave_identity import load_legacy_user_ids, validate_cached_identities, deterministic_user_uuid

LEGACY = 'a1111111-1111-4111-8111-111111111111'

@pytest.mark.parametrize('entries', [[], {}, [{'id': 42, 'uuid': LEGACY}, {'id': 42, 'uuid': LEGACY}], [{'id': 42, 'uuid': LEGACY}, {'id': 43, 'uuid': LEGACY}], [{'id': True, 'uuid': LEGACY}]])
def test_legacy_map_rejects_ambiguous_or_empty_data(tmp_path, entries):
    path = tmp_path / 'map.json'
    path.write_text(json.dumps(entries))
    with pytest.raises(ValueError):
        load_legacy_user_ids(path)

def test_missing_legacy_cache_mapping_fails_closed():
    with pytest.raises(ValueError, match='cache'):
        validate_cached_identities({}, [(42, LEGACY)])

def test_cache_allows_legacy_and_new_deterministic_identity_after_restart():
    validate_cached_identities({42: LEGACY}, [(42, LEGACY), (99, deterministic_user_uuid(99))])

def test_deleted_history_requires_complete_snapshot_and_is_preserved():
    assert validate_cached_identities({42: LEGACY}, [(7, 'b2222222-2222-4222-8222-222222222222')],
                                      remote_identities=[(42, LEGACY)]) == 1


def test_reused_remote_id_rejects_historical_uuid():
    with pytest.raises(ValueError, match='cache'):
        validate_cached_identities({}, [(7, LEGACY)], remote_identities=[(7, deterministic_user_uuid(7))])


def test_deleted_cache_uuid_cannot_belong_to_another_legacy_id():
    with pytest.raises(ValueError, match='another'):
        validate_cached_identities({42: LEGACY}, [(7, LEGACY)], remote_identities=[])


def test_deleted_cache_uuid_cannot_belong_to_another_live_id():
    with pytest.raises(ValueError, match='another'):
        validate_cached_identities({}, [(7, LEGACY)], remote_identities=[(99, LEGACY)])


def test_matching_seed_does_not_override_conflicting_live_identity():
    with pytest.raises(ValueError, match='conflicts'):
        validate_cached_identities({42: LEGACY}, [(42, LEGACY)],
                                  remote_identities=[(42, deterministic_user_uuid(42))])

def test_reused_seeded_id_cannot_hide_changed_short_uuid_behind_legacy_alias():
    with pytest.raises(ValueError, match='short UUID'):
        validate_cached_identities({42: LEGACY}, [(42, LEGACY, 'old-short')],
                                  remote_identities=[(42, LEGACY, 'new-short')])