import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent))

from app.modules.internet_connections.backend import change_case_service as service


def test_relevant_change_filter_excludes_manual_classification_and_customer():
    changes = service.filter_relevant_changes({
        'monthly_cost': {'from': 100, 'to': 125},
        'customer_id': {'from': None, 'to': 7},
        'allocation_model': {'from': 'dedicated', 'to': 'shared'},
        'notes': {'from': 'før', 'to': 'efter'},
    })
    assert changes == {'monthly_cost': {'from': 100, 'to': 125}}


def test_same_import_merges_into_existing_case(monkeypatch):
    writes = []
    monkeypatch.setattr(service, 'execute_query_single', lambda query, params=None: (
        {'id': 4, 'sag_id': 91, 'changes': {'monthly_cost': {'from': 100, 'to': 125}}}
        if 'FROM internet_connection_change_cases' in query else None
    ))
    monkeypatch.setattr(service, 'execute_query', lambda query, params=None, fetch=True: writes.append((query, params)))

    result = service.ensure_external_change_case(
        connection_id=5, source_type='test_import', source_key='same-file',
        source_label='Testfil', connection_name='Fiber', reference='NKA-1', provider='Leverandør',
        owner_customer_id=7, changes={'speed_mbps': {'from': 100, 'to': 200}},
    )

    assert result['case_id'] == 91
    assert result['created'] is False
    assert set(result['changes']) == {'monthly_cost', 'speed_mbps'}
    assert any('UPDATE sag_sager' in query for query, _ in writes)


def test_case_failure_is_reported_without_raising(monkeypatch):
    monkeypatch.setattr(service, 'execute_query_single', lambda *args, **kwargs: (_ for _ in ()).throw(RuntimeError('database down')))
    monkeypatch.setattr(service, 'execute_query', lambda *args, **kwargs: None)
    result = service.ensure_external_change_case(
        connection_id=5, source_type='test', source_key='run-1', source_label='Test',
        changes={'status': {'from': 'active', 'to': 'inactive'}},
    )
    assert result['case_id'] is None
    assert result['error'] == 'database down'