"""Corridors have no aspect requirement (homemaker-py-hxi, DESIGN.md §39.22).

Owner's ruling: "there should be no cap on the proportion of a corridor,
especially for big buildings, the crinkliness rule is there to prevent these
becoming unpleasant spaces."

The tests below pin both halves of that — the cap is gone, AND crinkliness
still does the job the cap was wrongly doing, so removing it did not leave
long buried corridors unpunished.
"""

from __future__ import annotations

import copy
import math
from pathlib import Path

import pytest

from homemaker_layout import dom as dom_mod
from homemaker_layout.fitness import (
    CONF_DEFAULTS, FAIL_THRESHOLD, Fitness, gaussian, load_config,
)

EXAMPLES = Path(__file__).resolve().parent.parent / "examples"
pytestmark = pytest.mark.skipif(not (EXAMPLES / "harbor-house").is_dir(),
                                reason="examples absent")


def _fit(**ov):
    conf, cost = load_config(EXAMPLES / "harbor-house", overrides=ov)
    return Fitness(conf, cost)


def test_there_is_no_corridor_aspect_requirement():
    assert CONF_DEFAULTS["proportion_circulation"] is None
    fit = _fit()
    assert dom_mod.is_circulation(dom_mod.Node(type="C"))
    # any aspect at all scores 1.0 -- checked through the real code path
    for aspect in (1.0, 3.0, 12.0, 40.0):
        fit_leaf = dom_mod.Node(
            type="C", node=[[0.0, 0.0], [aspect, 0.0], [aspect, 1.0], [0.0, 1.0]])
        assert fit.quality_proportion(fit_leaf) == 1.0, aspect


def test_a_room_still_has_one():
    """The ruling is about corridors. A habitable room's aspect target stands."""
    fit = _fit()
    room = dom_mod.Node(type="r", node=[[0.0, 0.0], [12.0, 0.0], [12.0, 1.0], [0.0, 1.0]])
    assert fit.quality_proportion(room) < FAIL_THRESHOLD


def test_crinkliness_is_what_punishes_an_unpleasant_corridor():
    """The ruling's own justification, as arithmetic.

    A long BURIED corridor is exactly the unpleasant space the aspect cap was
    being used to prevent; crinkliness sends it to zero. A long corridor along
    a facade is a perfectly good corridor, and crinkliness likes it.
    """
    target, sigma = CONF_DEFAULTS["uncrinkliness_circulation"]
    h, width, length = 3.0, 2.4, 30.0
    area = width * length

    buried = 0.0                       # no illuminated wall at all
    assert buried == 0.0

    lit_one_side = (length * h) / area  # the long wall is a facade
    q = gaussian(1.0 / lit_one_side, 1.0, target, sigma)
    assert q > 0.85, "a daylit corridor along a facade should score well"


def test_removing_the_cap_only_ever_removes_proportion_fails():
    """It cannot introduce a failure, and it touches nothing but corridors."""
    old = {"proportion_circulation": [1.5, 0.5]}
    seen = 0
    for name in ("harbor-house", "maple-court", "health-centre", "programme-house"):
        d = EXAMPLES / name
        for p in sorted(d.glob("coldstart-500000-s*.dom")):
            root = dom_mod.load(str(p))
            c_old, cost = load_config(d, overrides=old)
            c_new, _ = load_config(d)
            _, f_old = Fitness(c_old, cost).score_with_fails(copy.deepcopy(root))
            _, f_new = Fitness(c_new, cost).score_with_fails(copy.deepcopy(root))
            assert not (set(f_new) - set(f_old)), "must not add a failure"
            assert all(f.endswith(" proportion") for f in set(f_old) - set(f_new))
            seen += 1
    assert seen >= 4


def test_the_shape_curve_dp_accepts_an_unbounded_aspect():
    """`leaf_constraints` feeds rmax into the DP; None must become inf, not crash
    and not silently fall back to a finite cap."""
    from homemaker_layout import shapecurve
    fit = _fit()
    leaf = dom_mod.Node(type="C", node=[[0.0, 0.0], [4.0, 0.0], [4.0, 4.0], [0.0, 4.0]])
    assert math.isinf(shapecurve.leaf_constraints(fit, leaf).rmax)