"""Tests for the Cartesian product combinator."""

import pytest

from physcom.engine.combinator import generate_combinations
from physcom.models.entity import Entity


def test_generates_cartesian_product(seeded_repo):
    combos = generate_combinations(seeded_repo, ["platform", "power_source"])
    # 9 platforms x 9 power sources = 81
    assert len(combos) == 81


def test_each_combo_has_one_per_dimension(seeded_repo):
    combos = generate_combinations(seeded_repo, ["platform", "power_source"])
    for combo in combos:
        dims = [e.dimension for e in combo.entities]
        assert "platform" in dims
        assert "power_source" in dims
        assert len(combo.entities) == 2


def test_missing_dimension_raises(seeded_repo):
    with pytest.raises(ValueError, match="No entities found"):
        generate_combinations(seeded_repo, ["platform", "nonexistent"])