"""Golden tests for EXECUTION_PLAN_COMPILER_V1 (governance/todo/v8_9_p2_adoption_plan.yaml P2-D).

Maps to v8.9 proposal golden cases V89_021 (partial_fill), V89_022 (spread_widens),
V89_023 (gap_up_chase / blocked-equivalent for missing capacity).
"""
from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_execution_plan_compiler_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_execution_plan_compiler_v1", MODULE_PATH)
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(module)
    return module


def test_v89_021_partial_fill_continues_when_conditions_stable() -> None:
    mod = _load_module()
    baseline = {"spread_bps": 10, "order_capacity_krw": 1000000, "cash_floor_pct": 15.0}
    slices = mod.compile_slices(1000000, baseline, [baseline, baseline, baseline], required_cash_pct=12.5)
    assert [s["status"] for s in slices] == ["COMPILED", "COMPILED", "COMPILED"]


def test_v89_022_spread_widening_before_slice2_cancels_remainder() -> None:
    mod = _load_module()
    baseline = {"spread_bps": 10, "order_capacity_krw": 1000000, "cash_floor_pct": 15.0}
    widened = {"spread_bps": 20, "order_capacity_krw": 1000000, "cash_floor_pct": 15.0}
    slices = mod.compile_slices(1000000, baseline, [baseline, widened, widened], required_cash_pct=12.5)
    assert slices[0]["status"] == "COMPILED"
    assert slices[1]["status"] == "CANCELLED"
    assert slices[1]["reason_code"] == "spread_widens_beyond_limit"
    assert slices[2]["status"] == "CANCELLED"


def test_cash_floor_breach_mid_execution_cancels_remainder() -> None:
    mod = _load_module()
    baseline = {"spread_bps": 10, "order_capacity_krw": 1000000, "cash_floor_pct": 15.0}
    breached = {"spread_bps": 10, "order_capacity_krw": 1000000, "cash_floor_pct": 5.0}
    slices = mod.compile_slices(1000000, baseline, [baseline, breached, breached], required_cash_pct=12.5)
    assert slices[1]["reason_code"] == "cash_floor_after_fill_breached"


def test_v89_023_missing_capacity_blocks_entire_compile() -> None:
    mod = _load_module()
    result = {"order_capacity_krw": None}
    assert result["order_capacity_krw"] is None