"""사토장(유용토운반작업장) 성토 단면 — 파이썬·TS 짝이 같은 값을 내는지 (2026-09-09).

화면(B06 횡단도)이 그리고 서버(B08 수량)가 세는 값이라 두 쪽이 갈리면
「그림은 이런데 수량은 저렇다」가 된다.

⚠ 폭의 시작점이 **노면 끝**이라는 것과, 폭 상한이 **지반 샘플이 있는 데까지**라는 것을
  함께 잠근다. 둘 다 사용자 확정이다.
"""

from __future__ import annotations

import json
import re
import subprocess
import sys
from pathlib import Path

import pytest

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

from common_util.common_util_spoil_fill import (  # noqa: E402
    solve_spoil_width_m,
    spoil_fill_section,
    spoil_max_width_m,
)

TSC = PROJECT_ROOT / "config" / "node_modules" / "typescript" / "bin" / "tsc"

#: 왼쪽으로 완만히 내려가는 지반. 노면 끝은 (2.0, 100.0).
GROUND = [(-10.0, 98.0), (0.0, 100.0), (5.0, 99.5), (10.0, 98.0), (20.0, 95.0), (30.0, 92.0)]

_RUNNER = """
import { writeFileSync } from "node:fs";
import { spoilFillSection, solveSpoilWidthM, spoilMaxWidthM } from "./common_util_spoil_fill.js";

const ground = %s.map(([offset_m, elevation_m]) => ({ offset_m, elevation_m }));
const base = { ground, startOffsetM: 2.0, startElevationM: 100.0, side: "left" };
const out = {
  maxWidth: spoilMaxWidthM(base),
  widths: [0, 2, 4, 8, 40].map((widthM) => {
    const s = spoilFillSection({ ...base, widthM, slopeRatioN: 1.5 });
    return { area: s.area_m2, toe: s.toeOffsetM, unclosed: s.unclosed, line: s.line.map((p) => [p.offset_m, p.elevation_m]) };
  }),
  right: (() => {
    const s = spoilFillSection({ ...base, side: "right", startOffsetM: -2.0, widthM: 4, slopeRatioN: 1.5 });
    return { area: s.area_m2, toe: s.toeOffsetM, line: s.line.map((p) => [p.offset_m, p.elevation_m]) };
  })(),
  solved: [10, 40, 100000].map((target) => {
    const r = solveSpoilWidthM({ ...base, slopeRatioN: 1.5 }, target);
    return { widthM: r.widthM, area: r.section.area_m2 };
  }),
};
writeFileSync(process.argv[2], JSON.stringify(out));
""" % json.dumps(GROUND)


def _ts_values(tmp_path: Path) -> dict:
    out = tmp_path / "js"
    subprocess.run(  # noqa: S603 — 고정 실행 파일
        [
            "node",
            str(TSC),
            str(PROJECT_ROOT / "common_util" / "common_util_spoil_fill.ts"),
            "--outDir",
            str(out),
            "--module",
            "esnext",
            "--target",
            "es2022",
            "--moduleResolution",
            "bundler",
            "--ignoreConfig",
        ],
        cwd=str(PROJECT_ROOT),
        check=True,
        capture_output=True,
    )
    for emitted in out.glob("*.js"):
        text = emitted.read_text(encoding="utf-8")
        emitted.write_text(
            re.sub(r'(from "\./[^"]+?)(")', lambda m: m.group(1) + ".js" + m.group(2), text),
            encoding="utf-8",
        )
    (out / "runner.mjs").write_text(_RUNNER, encoding="utf-8")
    result = tmp_path / "out.json"
    subprocess.run(  # noqa: S603
        ["node", str(out / "runner.mjs"), str(result)],
        cwd=str(PROJECT_ROOT),
        check=True,
        capture_output=True,
    )
    return json.loads(result.read_text(encoding="utf-8"))


@pytest.mark.skipif(not TSC.is_file(), reason="프론트엔드 의존성 미설치")
def test_두_쪽이_같은_값을_낸다(tmp_path: Path) -> None:
    ts = _ts_values(tmp_path)

    assert ts["maxWidth"] == pytest.approx(spoil_max_width_m(GROUND, 2.0, "left"))
    for index, width in enumerate((0, 2, 4, 8, 40)):
        py = spoil_fill_section(GROUND, 2.0, 100.0, "left", width, 1.5)
        got = ts["widths"][index]
        assert got["area"] == pytest.approx(py.area_m2), width
        assert got["toe"] == pytest.approx(py.toe_offset_m), width
        assert got["unclosed"] == py.unclosed, width
        assert [tuple(point) for point in got["line"]] == py.line, width

    right = spoil_fill_section(GROUND, -2.0, 100.0, "right", 4, 1.5)
    assert ts["right"]["area"] == pytest.approx(right.area_m2)
    assert [tuple(point) for point in ts["right"]["line"]] == right.line

    for index, target in enumerate((10, 40, 100000)):
        width, section = solve_spoil_width_m(GROUND, 2.0, 100.0, "left", 1.5, target)
        assert ts["solved"][index]["widthM"] == pytest.approx(width), target
        assert ts["solved"][index]["area"] == pytest.approx(section.area_m2), target


def test_폭은_노면_끝에서_잰다() -> None:
    """시작점이 노면 끝이라 **그 구간 노견도 이 성토 안에 든다**(사용자 확정)."""
    section = spoil_fill_section(GROUND, 2.0, 100.0, "left", 4.0, 1.5)
    assert section.line[0] == (2.0, 100.0)
    assert section.line[1] == (6.0, 100.0)  # 평상은 노면 끝 높이 그대로
    assert section.toe_offset_m > 6.0


def test_넓힐수록_많이_담긴다() -> None:
    areas = [spoil_fill_section(GROUND, 2.0, 100.0, "left", w, 1.5).area_m2 for w in (0, 2, 4, 8)]
    assert areas == sorted(areas)
    assert areas[0] < areas[-1]


def test_지반_샘플_밖으로는_안_넓힌다() -> None:
    """샘플 밖은 지반을 모른다 — 넓히면 근거 없는 부피가 된다."""
    limit = spoil_max_width_m(GROUND, 2.0, "left")
    assert limit == pytest.approx(28.0)
    wide = spoil_fill_section(GROUND, 2.0, 100.0, "left", 100.0, 1.5)
    assert wide.toe_offset_m <= 30.0
    assert wide.unclosed is True  # 지반을 못 만나고 잘렸음을 드러낸다


def test_담을_수_없는_양은_상한_폭을_돌려준다() -> None:
    """임의로 더 넓히지 않는다 — 못 담는 몫은 부르는 쪽이 「남은 사토」로 드러낸다."""
    width, section = solve_spoil_width_m(GROUND, 2.0, 100.0, "left", 1.5, 1e6)
    assert width == pytest.approx(spoil_max_width_m(GROUND, 2.0, "left"))
    assert section.area_m2 < 1e6


def test_기울기가_완만하면_더_담긴다() -> None:
    steep = spoil_fill_section(GROUND, 2.0, 100.0, "left", 4.0, 1.0)
    gentle = spoil_fill_section(GROUND, 2.0, 100.0, "left", 4.0, 2.0)
    assert gentle.area_m2 > steep.area_m2