"""Summer PDRC / BTES is an added benefit — never winter firm capacity."""

from __future__ import annotations

import sys
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT))

from system_b_ledger import SystemBLedger, build_ledger  # noqa: E402


@pytest.fixture
def ledger() -> SystemBLedger:
    return build_ledger()


def test_summer_pdrc_registered_as_engineering_addon(ledger: SystemBLedger) -> None:
    assert ledger.pdrc_summer_shave_mw == 50
    assert ledger.btes_summer_chiller_shave_mw == 70
    assert ledger.summer_peak_shave_total_mw == 120


def test_summer_shave_never_enters_winter_accreditation(ledger: SystemBLedger) -> None:
    winter_full = (
        ledger.bess_mw
        + ledger.dsm_mw
        + ledger.intertie_mw
        + ledger.hub_net_electric_mw
    )
    assert ledger.accreditation_mw["full"] == winter_full
    assert ledger.summer_peak_shave_total_mw not in ledger.accreditation_mw.values()
    assert ledger.pdrc_summer_shave_mw not in ledger.accreditation_mw.values()
    # Forbidden: pad winter firm with summer cooling
    padded = ledger.accreditation_mw["reference"] + ledger.summer_peak_shave_total_mw
    assert padded != ledger.accreditation_mw["reference"]
    assert padded not in ledger.accreditation_mw.values()
    from regulator_paper_assumptions import v
    assert v("btes_winter_eligible_mw") == 0
    assert v("btes_winter_planning_mw") == 120
    assert v("btes_winter_planning_mw") not in ledger.accreditation_mw.values()
    winter_padded = ledger.accreditation_mw["reference"] + v("btes_winter_planning_mw")
    assert winter_padded not in ledger.accreditation_mw.values()
    # Same magnitude as summer 50+70=120; different season — do not add.
    assert v("btes_winter_planning_mw") == ledger.summer_peak_shave_total_mw


def test_pass_report_flags_summer_as_addon(ledger: SystemBLedger) -> None:
    report = ledger.pass_report()
    assert report["gates"]["summer_addon_not_winter_firm"] is True
    assert report["summer_peak_shave_total_mw"] == 120
    assert "250" not in report["headline"] or "413" in report["headline"]