from __future__ import annotations

from app.domain.portfolio_math import resolve_portfolio_spot_from_quote
from app.models.portfolio import PortfolioConfig
from app.pages.common import strategy_metrics
from app.pages.hedge import _cost_benefit_options, _waterfall_options


def test_protective_put_atm_minus_20pct_improves_equity() -> None:
    metrics = strategy_metrics("protective_put_atm", -20)

    assert metrics["scenario_price"] == 172.0
    assert metrics["unhedged_equity"] == 27_000.0
    assert metrics["hedged_equity"] == 63_750.0
    assert metrics["hedged_equity"] > metrics["unhedged_equity"]
    assert metrics["waterfall_steps"] == [
        ("Base equity", 70_000.0),
        ("Spot move", -43_000.0),
        ("Option payoff", 43_000.0),
        ("Call cap", 0.0),
        ("Hedge cost", -6_250.0),
        ("Net equity", 63_750.0),
    ]


def test_hedge_waterfall_uses_zero_based_contribution_bars() -> None:
    options = _waterfall_options(strategy_metrics("protective_put_atm", -20))

    assert len(options["series"]) == 1
    assert options["series"][0]["type"] == "bar"
    assert options["series"][0]["label"]["show"] is True
    values = options["series"][0]["data"]
    assert values[2]["value"] == 43_000.0
    assert values[2]["itemStyle"]["color"] == "#22c55e"


def test_cost_benefit_chart_shows_positive_downside_benefit_when_puts_are_in_the_money() -> None:
    metrics = strategy_metrics(
        "protective_put_atm",
        -20,
        portfolio={
            **{
                "gold_value": 968000.0,
                "loan_amount": 145000.0,
                "ltv_ratio": 145000.0 / 968000.0,
                "net_equity": 823000.0,
                "spot_price": 4400.0,
                "gold_units": 220.0,
                "margin_call_ltv": 0.75,
                "margin_call_price": 878.79,
                "cash_buffer": 18500.0,
                "hedge_budget": 8000.0,
            }
        },
    )
    options = _cost_benefit_options(metrics)

    assert options["xAxis"]["name"] == "Collateral spot"
    assert options["yAxis"]["name"] == "Net hedge benefit / oz"
    assert options["series"][0]["data"][0] > 0
    assert options["series"][0]["data"][1] > 0


def test_hedge_quote_resolution_converts_gld_share_price_to_ozt_spot() -> None:
    """Hedge page should convert GLD share quotes to USD/ozt using expense-adjusted backing."""
    from datetime import date

    from app.domain.instruments import gld_ounces_per_share

    config = PortfolioConfig(entry_price=4400.0, gold_ounces=220.0, entry_basis_mode="weight", loan_amount=145000.0)
    share_quote = {
        "symbol": "GLD",
        "price": 404.19,
        "quote_unit": "share",
        "source": "yfinance",
        "updated_at": "2026-03-25T00:00:00+00:00",
    }

    spot, source, updated_at = resolve_portfolio_spot_from_quote(config, share_quote)

    # With expense-adjusted backing (~0.0916 oz/share), spot = 404.19 / 0.091576... ≈ 4413.71
    current_backing = float(gld_ounces_per_share(date.today()))
    expected_spot = 404.19 / current_backing
    assert abs(spot - expected_spot) < 0.01
    assert source == "yfinance"


def test_hedge_quote_resolution_fails_closed_when_quote_unit_missing() -> None:
    """Hedge page should fall back to configured price when quote_unit is missing."""
    config = PortfolioConfig(entry_price=4400.0, gold_ounces=220.0, entry_basis_mode="weight", loan_amount=145000.0)
    legacy_quote = {
        "symbol": "GLD",
        "price": 404.19,
        "source": "cache",
    }

    spot, source, _ = resolve_portfolio_spot_from_quote(config, legacy_quote)

    assert spot == 4400.0
    assert source == "configured_entry_price"


def test_hedge_quote_resolution_fails_closed_for_unsupported_instrument() -> None:
    """Hedge page should fall back when instrument metadata is unavailable."""
    config = PortfolioConfig(entry_price=4400.0, gold_ounces=220.0, entry_basis_mode="weight", loan_amount=145000.0)
    slv_quote = {
        "symbol": "SLV",
        "price": 28.50,
        "quote_unit": "share",
        "source": "yfinance",
        "updated_at": "2026-03-25T00:00:00+00:00",
    }

    spot, source, _ = resolve_portfolio_spot_from_quote(config, slv_quote)

    assert spot == 4400.0
    assert source == "configured_entry_price"