"""Locks the marginal-vs-TP01 scorer (altlib) — the harness fix from the 2026-06-20 sweep.

The point: absolute Sharpe is not enough to earn a portfolio slot. A candidate must
IMPROVE the TP01 baseline out-of-sample. These tests pin the invariants:
  * the TP01 baseline reproduces the canonical ~1.30 full Sharpe,
  * TP01-vs-itself is REDUNDANT (zero marginal),
  * a flat (do-nothing) sleeve never earns a slot.
"""
import sys
from pathlib import Path

import numpy as np

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT / "scripts" / "research" / "alt"))

import altlib as al  # noqa: E402
from src.strategies.trend_portfolio import CANONICAL, TrendPortfolio  # noqa: E402


def test_tp01_baseline_reproduces_canonical():
    r = al.tp01_baseline_daily().values
    sharpe = float(np.mean(r) / np.std(r) * np.sqrt(365.25))
    assert 1.1 < sharpe < 1.5, f"TP01 baseline Sharpe {sharpe:.2f} off canonical ~1.30"


def test_tp01_vs_itself_is_redundant():
    cand = al.candidate_daily(lambda df: TrendPortfolio(**CANONICAL).target_series(df))
    m = al.marginal_vs_tp01(cand)
    assert m["corr_full"] > 0.95
    assert abs(m["blends"]["w25"]["uplift_full"]) < 0.05
    assert m["marginal_verdict"] == "REDUNDANT"
    assert al.study_marginal("tp01-self", lambda df: TrendPortfolio(**CANONICAL).target_series(df))["earns_slot"] is False


def test_flat_sleeve_earns_no_slot():
    m = al.marginal_vs_tp01(al.candidate_daily(lambda df: np.zeros(len(df))))
    assert m["marginal_verdict"] != "ADDS"


def test_call_target_passes_asset_when_accepted():
    seen = {}

    def two_arg(df, asset):
        seen[asset] = True
        return np.zeros(len(df))

    al.candidate_daily(two_arg)
    assert seen == {"BTC": True, "ETH": True}