"""PLAN 407-3 — 구조물을 MC 위에 놓았다 빼면 서버 종단 정본의 곡선 측점이 되살아남.

[저장] 차례(관 · 구조물 → 횡단) 의 `ensure_structure_stations` 길 — `_curve_marks`(어긋남 판정) ·
`sample_structure_sections(with_curves=True)`(곡선 측점도 뜸) · `_merge_irregular_into_longitudinal`
(옛 곡선 측점도 새 목록이 갈음). 노선 저장을 안 기다림 · 놓은 동안엔 그 자리 구조물 측점 하나.
"""

from __future__ import annotations

import json
import sys
from pathlib import Path

import numpy as np
import pytest

ROOT = Path(__file__).resolve().parents[2]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from B05_Profile import B05_Profile_Engine_Sections as sections  # noqa: E402
from B05_Profile import B05_Profile_Engine_Sections_Core as core  # noqa: E402
from B05_Profile.B05_Profile_Router_Confirm import (  # noqa: E402
    _merge_irregular_into_longitudinal,
)
from B06_Section.B06_Section_Router_Stations import _curve_marks  # noqa: E402

LINE = [[0.0, 0.0, 100.0], [1000.3, 0.0, 100.0]]
SHORT = {"start": [101.0, 0.0], "apex": [107.3, 2.0], "end": [113.6, 0.0], "radius_m": 30.0}
LONG = {"start": [616.1, 0.0], "apex": [631.3, 3.0], "end": [646.5, 0.0], "radius_m": 40.0}


class _Flat:
    def sample_xy(self, xy):
        count = len(np.asarray(xy, dtype=np.float64))
        return np.full(count, 100.0), np.ones(count, dtype=bool)


@pytest.fixture
def project(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> dict:
    """노선 · 곡선표 · 관 · 구조물 정본 대신 — 바꿀 수 있는 구조물 측점 하나(`extras`)."""
    state: dict = {"extras": ()}
    monkeypatch.setattr(sections, "_load_route_polyline", lambda *_: LINE)
    monkeypatch.setattr(sections, "_load_design_curves", lambda *_: [SHORT, LONG])
    monkeypatch.setattr(sections, "load_station_snap", lambda *_: False)
    monkeypatch.setattr(sections, "load_station_snap_step", lambda *_: None)
    monkeypatch.setattr(sections, "build_surface_sampler", lambda *_, **__: _Flat())
    monkeypatch.setattr(sections, "_load_pipe_points", lambda *_: [])
    monkeypatch.setattr(sections, "resolve_extra_stations", lambda *_: state["extras"])
    # 노선 저장 때 정본 = 전체 생성(곡선 측점 107 · 631)
    full = core.generate_sections(LINE, _Flat(), design_curves=[SHORT, LONG])["longitudinal"]
    folder = tmp_path / "B06_Section" / "longitudinal"
    folder.mkdir(parents=True)
    (tmp_path / "B06_Section" / "cross_sections").mkdir()
    (folder / "longitudinal.json").write_text(json.dumps(full), encoding="utf-8")
    state["root"] = tmp_path
    return state


def _save(state: dict) -> list[dict]:
    """[저장] 의 횡단 차례 — 어긋나면 다시 떠 병합(`ensure_structure_stations` 와 같은 길)."""
    root = state["root"]
    options = core.SectionGenerationOptions()
    if _curve_marks(root, "route.json", options) == 0 and not state["extras"]:
        return _stations(root)
    fresh = sections.generate_irregular_sections(
        root, "route.json", "f", "m", False, extra_stations=state["extras"], options=options
    )
    _merge_irregular_into_longitudinal(root, "B06_Section/longitudinal/longitudinal.json", fresh)
    return _stations(root)


def _stations(root: Path) -> list[dict]:
    path = root / "B06_Section" / "longitudinal" / "longitudinal.json"
    return json.loads(path.read_text(encoding="utf-8"))["stations"]


def _at(stations: list[dict], chainage: float) -> list[str]:
    return [s["kind"] for s in stations if abs(s["chainage_m"] - chainage) < 0.01]


def test_처음은_맞음(project) -> None:
    assert _curve_marks(project["root"], "route.json", core.SectionGenerationOptions()) == 0
    assert _at(_stations(project["root"]), 107.0) == ["curve"]


def test_MC_위_구조물_놓음_뺌(project) -> None:
    root = project["root"]
    project["extras"] = ((107.0, "관"),)
    assert _curve_marks(root, "route.json", core.SectionGenerationOptions()) == 1
    placed = _save(project)
    assert _at(placed, 107.0) == ["irregular"]  # 놓은 동안 = 구조물 측점 하나
    assert _at(placed, 631.0) == ["curve"]  # 다른 곡선 측점은 그대로
    assert list((root / "B06_Section" / "cross_sections").glob("cross_*.json"))

    project["extras"] = ()
    assert _curve_marks(root, "route.json", core.SectionGenerationOptions()) == 1
    removed = _save(project)
    assert _at(removed, 107.0) == ["curve"]  # 노선 저장 없이 되살아남
    assert _at(removed, 631.0) == ["curve"]
    assert _curve_marks(root, "route.json", core.SectionGenerationOptions()) == 0
    assert len(removed) == len(_stations_full())


def _stations_full() -> list[dict]:
    return core.generate_sections(LINE, _Flat(), design_curves=[SHORT, LONG])["longitudinal"][
        "stations"
    ]


def test_planned_curve_stations_는_생성과_같음() -> None:
    extras = ((107.0, "관"), (300.0, "옹벽"))
    for snap, step in [(False, None), (True, None), (True, 0.1)]:
        options = core.SectionGenerationOptions(extra_stations=extras)
        made = core.generate_sections(
            LINE,
            _Flat(),
            options,
            design_curves=[SHORT, LONG],
            station_snap=snap,
            station_snap_step=step,
        )["longitudinal"]["stations"]
        planned = core.planned_curve_stations(
            LINE,
            options,
            design_curves=[SHORT, LONG],
            station_snap=snap,
            station_snap_step=step,
        )
        assert planned == [s["chainage_m"] for s in made if s["kind"] == "curve"]