"""Tests for the synthetic reference domain (D4)."""

import pytest

from portfolio_optimiser.reference_domain import CostItem, Project, load_reference_projects


@pytest.fixture(scope="module")
def projects() -> tuple[Project, ...]:
    return load_reference_projects()


def test_loads_non_empty(projects: tuple[Project, ...]) -> None:
    assert len(projects) >= 1


def test_project_ids_unique(projects: tuple[Project, ...]) -> None:
    ids = [p.id for p in projects]
    assert len(ids) == len(set(ids))


def test_every_project_well_formed(projects: tuple[Project, ...]) -> None:
    for p in projects:
        assert p.id and p.name and p.description
        assert p.currency == "NOK"
        assert len(p.cost_items) >= 1


def test_cost_item_total_is_quantity_times_unit_cost() -> None:
    item = CostItem(code="X", description="d", quantity=4.0, unit="m2", unit_cost=215.0)
    assert item.total_cost == pytest.approx(860.0)


def test_project_total_is_sum_of_items(projects: tuple[Project, ...]) -> None:
    for p in projects:
        expected = sum(item.total_cost for item in p.cost_items)
        assert p.total_cost == pytest.approx(expected)
        assert p.total_cost > 0