import pytest

from fin_hub.coupling.ops_hub import ServiceCostLine, build_service_cost_report
from fin_hub.ingest.hosteurope import parse_hosteurope_csv
from pathlib import Path


def test_build_service_cost_report_groups_by_service():
    rows = parse_hosteurope_csv(Path(__file__).parent / "fixtures" / "hosteurope.csv")
    lines = [
        ServiceCostLine(
            service_id=row.service_id,
            environment=row.environment,
            period_month=row.period_month,
            amount=row.amount,
            currency=row.currency,
            source=row.source,
        )
        for row in rows
    ]
    report = build_service_cost_report(lines)
    assert report["signal"] == "service_cost_attribution"
    assert len(report["services"]) == 2
    assert report["totals_by_month"]["2026-06"] == pytest.approx(99.8)