from __future__ import annotations

import pytest


def test_ltv_calculation(sample_portfolio) -> None:
    assert sample_portfolio.current_ltv == pytest.approx(0.60, rel=1e-12)
    assert sample_portfolio.ltv_at_price(460.0) == pytest.approx(0.60, rel=1e-12)
    assert sample_portfolio.ltv_at_price(368.0) == pytest.approx(0.75, rel=1e-12)


def test_net_equity_calculation(sample_portfolio) -> None:
    assert sample_portfolio.net_equity == pytest.approx(400_000.0, rel=1e-12)
    assert sample_portfolio.net_equity_at_price(420.0) == pytest.approx(
        sample_portfolio.gold_ounces * 420.0 - 600_000.0,
        rel=1e-12,
    )


def test_margin_call_threshold(sample_portfolio) -> None:
    assert sample_portfolio.margin_call_price() == pytest.approx(368.0, rel=1e-12)
    assert sample_portfolio.ltv_at_price(sample_portfolio.margin_call_price()) == pytest.approx(0.75, rel=1e-12)