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_period_currency"] == [
        {"period_month": "2026-06", "currency": "EUR", "total": pytest.approx(99.8)}
    ]
    assert report["attributions"][0]["cost_attribution_key"] is None
    assert report["unattributed"][0]["total"] == pytest.approx(99.8)


def test_build_service_cost_report_groups_by_client_attribution():
    lines = [
        ServiceCostLine(
            service_id="cluster",
            environment="production",
            period_month="2026-07",
            amount=42.0,
            currency="EUR",
            source="fixture",
            client_id="acme",
            application_id="portal",
            app_instance_id="prod-01",
            cost_attribution_key="client:acme|app:portal|instance:prod-01",
        )
    ]

    report = build_service_cost_report(lines)

    assert report["attributions"] == [
        {
            "cost_attribution_key": "client:acme|app:portal|instance:prod-01",
            "client_id": "acme",
            "application_id": "portal",
            "app_instance_id": "prod-01",
            "environment": "production",
            "currency": "EUR",
            "months": {"2026-07": 42.0},
            "total": 42.0,
        }
    ]


def test_client_attribution_totals_do_not_mix_currencies():
    common = {
        "service_id": "cluster",
        "environment": "production",
        "period_month": "2026-07",
        "source": "fixture",
        "client_id": "acme",
        "application_id": "portal",
        "app_instance_id": "prod-01",
    }
    report = build_service_cost_report(
        [
            ServiceCostLine(amount=42.0, currency="EUR", **common),
            ServiceCostLine(amount=50.0, currency="USD", **common),
        ]
    )

    assert {(row["currency"], row["total"]) for row in report["attributions"]} == {
        ("EUR", 42.0),
        ("USD", 50.0),
    }


def test_service_totals_do_not_mix_currency_or_environment():
    common = {
        "service_id": "cluster",
        "period_month": "2026-07",
        "source": "fixture",
    }
    report = build_service_cost_report(
        [
            ServiceCostLine(amount=10.0, currency="EUR", environment="production", **common),
            ServiceCostLine(amount=20.0, currency="USD", environment="production", **common),
            ServiceCostLine(amount=30.0, currency="EUR", environment="development", **common),
        ]
    )

    assert {
        (row["environment"], row["currency"], row["total"])
        for row in report["services"]
    } == {
        ("production", "EUR", 10.0),
        ("production", "USD", 20.0),
        ("development", "EUR", 30.0),
    }
    assert report["totals_by_period_currency"] == [
        {"period_month": "2026-07", "currency": "EUR", "total": 40.0},
        {"period_month": "2026-07", "currency": "USD", "total": 20.0},
    ]