"""C1: the EXECUTED multistrat track (`multistrat_exec`) has no `backtest_summary` row of its own — it must
alias to the MODELED multistrat's basis-matched reference (persisted under sid `multistrat`) so the
reconciliation gate can catch execution decay (spec §4)."""
from __future__ import annotations

from fxhnt.application.forward_ingest import CockpitBacktestRefProvider


class _FakeSummary:
    def __init__(self, strategy_id: str, cagr: float) -> None:
        self.strategy_id = strategy_id
        self.cagr = cagr


class _FakeRepo:
    def __init__(self, summaries: list[_FakeSummary]) -> None:
        self._summaries = summaries

    def all_backtest_summaries(self) -> list[_FakeSummary]:
        return self._summaries


def test_multistrat_exec_aliases_to_modeled_multistrat_reference() -> None:
    repo = _FakeRepo([_FakeSummary("multistrat", 0.20)])
    provider = CockpitBacktestRefProvider(repo)

    ref = provider.reference("multistrat_exec", 30)

    assert ref is not None
    expected = (1.0 + 0.20) ** (30 / 365.0) - 1.0
    assert abs(ref.expected_window_return - expected) < 1e-12
    # sanity: the alias doesn't change the modeled track's own reference
    direct = provider.reference("multistrat", 30)
    assert direct is not None
    assert abs(direct.expected_window_return - expected) < 1e-12


def test_track_with_no_alias_and_no_row_returns_none() -> None:
    repo = _FakeRepo([_FakeSummary("multistrat", 0.20)])
    provider = CockpitBacktestRefProvider(repo)

    assert provider.reference("some_other_track", 30) is None