"""PLAN 483-1(요구 280-4) — 스냅이 일반측점을 MC 로 옮기지 않음 · MC 특별측점 더함.

서버 `_station_layout`(`generate_sections`) ↔ TS `buildStations` 거울 — 분석 D 재현 1 다섯 경우
(BP–EP 200 m 직선 · 곡선 하나 · 측점 간격 20 m). 짝 = `helper_280_4_stations.cjs`.
"""

from __future__ import annotations

import json
import subprocess
import sys
import tempfile
from pathlib import Path

import numpy as np
import pytest

HERE = Path(__file__).resolve().parent
ROOT = HERE.parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from B05_Profile import B05_Profile_Engine_Sections_Core as core  # noqa: E402

pytestmark = pytest.mark.skipif(
    not (ROOT / "config" / "node_modules" / "typescript").is_dir(),
    reason="프론트엔드 의존성 미설치",
)

LINE = [[0.0, 0.0], [200.0, 0.0]]


def _curve(bc: float, ec: float, radius: float = 30.0) -> list[dict]:
    return [
        {"start": [bc, 0.0], "apex": [(bc + ec) / 2, 3.0], "end": [ec, 0.0], "radius_m": radius}
    ]


CASES = {
    "A_10m_긴호_MC50": {"curves": _curve(34.3, 65.7), "snap": True, "step": 10.0},
    "B_10m_짧은호_MC50": {"curves": _curve(45.6, 54.4, 8.5), "snap": True, "step": 10.0},
    "C_10m_MC60": {"curves": _curve(44.3, 75.7), "snap": True, "step": 10.0},
    "D_측점No_MC47": {"curves": _curve(31.3, 62.7), "snap": True, "step": None},
    "E_스냅끔_MC50": {"curves": _curve(34.3, 65.7), "snap": False, "step": None},
}
GRID = [float(v) for v in range(0, 201, 20)]


class _Flat:
    def sample_xy(self, xy):
        count = len(np.asarray(xy))
        return np.zeros(count), np.ones(count, dtype=bool)


def _server(case: dict) -> list[dict]:
    data = core.generate_sections(
        [[x, y, 0.0] for x, y in LINE],
        _Flat(),
        core.SectionGenerationOptions(),
        design_curves=case["curves"],
        station_snap=case["snap"],
        station_snap_step=case["step"],
    )
    return data["longitudinal"]["stations"]


@pytest.fixture(scope="module")
def ts() -> dict:
    jobs = [{"line": LINE, **case} for case in CASES.values()]
    with tempfile.TemporaryDirectory() as folder:
        path = Path(folder) / "job.json"
        path.write_text(json.dumps(jobs), encoding="utf-8")
        proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
            ["node", str(HERE / "helper_280_4_stations.cjs"), str(path)],
            capture_output=True,
            text=True,
            encoding="utf-8",
            timeout=60,
        )
    assert proc.returncode == 0, proc.stderr
    return dict(zip(CASES, json.loads(proc.stdout), strict=True))


_KIND = {"bp": "end", "ep": "end", "regular": "grid", "curve": "curve"}

EXPECT_CURVE = {
    "A_10m_긴호_MC50": 50.0,
    "B_10m_짧은호_MC50": 50.0,
    "C_10m_MC60": None,
    "D_측점No_MC47": 47.0,
    "E_스냅끔_MC50": 50.0,
}


@pytest.mark.parametrize("name", list(CASES))
def test_일반측점_그대로_MC_특별측점(name, ts):
    server = _server(CASES[name])
    regular = [s["chainage_m"] for s in server if s["kind"] in ("bp", "regular", "ep")]
    assert regular == GRID  # 20 m 일반측점 하나도 안 사라짐
    curves = [s for s in server if s["kind"] == "curve"]
    mc = EXPECT_CURVE[name]
    if mc is None:  # N+0 = 일반측점 위 MC → 특별측점 없음
        assert curves == []
    else:
        assert [s["chainage_m"] for s in curves] == [mc]
        assert curves[0]["label"].endswith(" (MC)")
    # 거울 — 누가거리 · 종류
    ours = ts[name]
    assert [s["m"] for s in ours] == pytest.approx([s["chainage_m"] for s in server], abs=1e-6)
    assert [s["kind"] for s in ours] == [_KIND[s["kind"]] for s in server]


def test_A_열쇠(ts):
    keys = {s["key"]: s["m"] for s in ts["A_10m_긴호_MC50"]}
    assert keys["grid:2"] == 40.0 and keys["curve:50.00"] == 50.0
    for s in ts["A_10m_긴호_MC50"]:
        if s["kind"] == "grid":
            assert s["key"] == f"grid:{round(s['m'] / 20)}"


def test_스냅_켬_끔_같은_목록():
    on = _server(CASES["A_10m_긴호_MC50"])
    off = _server(CASES["E_스냅끔_MC50"])
    assert on == off