import importlib.util
import sys
from pathlib import Path


def load_module():
    path = Path(__file__).resolve().parents[1] / "scripts" / "search_long_short_fusion_with_calendar.py"
    spec = importlib.util.spec_from_file_location("search_long_short_fusion_with_calendar", path)
    assert spec is not None
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    sys.modules[spec.name] = module
    spec.loader.exec_module(module)
    return module


def test_report_text_handles_empty_selection():
    module = load_module()
    pandas = __import__("pandas")

    text = module.report_text("cmd", [], pandas.DataFrame(), pandas.DataFrame(), pandas.DataFrame())

    assert "No selected candidates" in text


def test_empty_output_column_contracts_are_declared():
    module = load_module()

    assert module.HORIZON_COLUMNS == [
        "name",
        "kind",
        "horizon",
        "start",
        "end",
        "total_return",
        "annualized_return",
        "max_drawdown",
        "calmar",
        "improved_vs_no_calendar",
        "delta_total_return",
        "delta_calmar",
        "delta_max_drawdown",
    ]
    assert module.MONTHLY_COLUMNS == ["name", "kind", "month", "start_equity", "end_equity", "return"]