"""261-1 거리이정표 km 칸 끝수 — 보이는 km = 3자리(1 m) 반올림 · 끝 0 지움 · 안 고치면 저장 m 그대로 ·
고치면 km × 1000 → m(끝수 없이)."""

import json
import re
import subprocess
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]
IMPORTS = re.compile(r"^import[^;]*;\n", re.MULTILINE)
UI = "B08_Quantity/B08_Quantity_UI_Milestone"


def _read(rel):
    return (ROOT / rel).read_text(encoding="utf-8")


def _node(src, expr):
    result = subprocess.run(
        ["node", "--experimental-strip-types", "--no-warnings",
         "--input-type=module-typescript", "-e",
         IMPORTS.sub("", src) + f"\nconsole.log(JSON.stringify({expr}));"],
        capture_output=True, text=True, encoding="utf-8", timeout=60,
    )  # fmt: skip
    assert result.returncode == 0, result.stderr
    return json.loads(result.stdout)


def _fmt(values):
    modal = _read(f"{UI}_Modal.ts")
    line = next(ln for ln in modal.splitlines() if ln.startswith("export const fmtKm"))
    return _node(line.replace("export ", ""), f"{json.dumps(values)}.map(fmtKm)")


def test_km_글_3자리_끝0_지움():
    assert _fmt([576.595 / 1000, 0.3, 0.1 + 0.2, 12, 0, 1.2345, 0.0005, 2 / 3]) == [
        "0.577", "0.3", "0.3", "12", "0", "1.235", "0.001", "0.667",
    ]  # fmt: skip


def test_고치면_km_곱하기_1000_끝수_없이():
    layout = _read("B08_Quantity/B08_Quantity_Milestone_Layout.ts")
    data = {"site": {"mid_station_m": 576.595, "mid_road": "비포장"}, "base": {}, "routes": []}
    expr = f'setLeg({json.dumps(data)}, "start", 0, {{ km: 0.3 }}).site.mid_station_m'
    assert _node(layout, expr) == 300
    # 안 고침 = km 키 없는 patch → 저장 m 그대로
    expr = f'setLeg({json.dumps(data)}, "start", 0, {{ road: "비포장" }}).site.mid_station_m'
    assert _node(layout, expr) == 576.595


def test_모든_km_칸_같은_규칙():
    modal = _read(f"{UI}_Modal.ts")
    site = modal[modal.index("export function openSiteInfo") :]
    assert "fmtKm(data.site.mid_station_m / 1000)" in site
    assert "fmtKm(site.mid_default_m / 1000)" in site
    assert "...(text === shown ? {} : { km })" in site  # 안 고침 = 덮지 않음

    leg = _read(f"{UI}_LegModal.ts")
    assert "fmtKm(data.site.mid_station_m / 1000)" in leg
    assert "fmtKm(site.mid_default_m / 1000)" in leg
    assert "...(dist.input.value === shown ? {} : { km: km(dist.input.value) })" in leg
    assert "dist.value === shown ? orig : km(dist.value)" in leg  # 구간 줄
    assert "fmtKm(leg.km)" in leg and "fmtKm(auto)" in leg

    diagram = _read(f"{UI}_Diagram.ts")
    assert "fmtKm(leg.km)" in diagram and "fmtKm(leg.auto_km)" in diagram
    assert "km.value === shown" in diagram  # 선 위 km 고치기 칸 · 안 고침 = 덮지 않음
    for src in (modal, leg, diagram):
        assert "String(leg.km)" not in src and "mid_station_m / 1000)" not in src.replace(
            "fmtKm(data.site.mid_station_m / 1000)", ""
        )  # 맨 String 변환 없음