/* 366-3 측점 스냅 = 곡선 가운데(MC)를 일반측점에 — `logic/B05_Profile_RouteEdit_StationFit.ts` 를
 * Node 로 돌려 JSON 한 줄을 냄(`test_366_3_station_fit.py` 가 판정).
 * `.cjs` = 루트 package.json 이 "type": "module" 이라서.
 */
const fs = require("fs");
const path = require("path");
const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));

const ROOT = path.join(__dirname, "..", "..");
const cache = new Map();

function loadTs(file) {
  const full = path.resolve(file);
  if (cache.has(full)) return cache.get(full);
  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
  }).outputText;
  const box = { exports: {} };
  cache.set(full, box.exports);
  const localRequire = (request) =>
    request.startsWith(".")
      ? loadTs(path.join(path.dirname(full), `${request}.ts`))
      : require(request);
  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
  cache.set(full, box.exports);
  return box.exports;
}

const LOGIC = path.join(ROOT, "B05_Profile", "logic");
const fit = loadTs(path.join(LOGIC, "B05_Profile_RouteEdit_StationFit.ts"));
const curve = loadTs(path.join(LOGIC, "B05_Profile_UI_RouteEdit_Curve.ts"));
const frame = loadTs(path.join(LOGIC, "B05_Profile_UI_RouteEdit_Frame.ts"));

const INTERVAL = 20;
const LIMITS = { minRadiusM: 30, limitRadiusM: 12, limitArcM: 0, intervalM: INTERVAL };
// 지그재그 노선 — 꺾임 다섯(교각 다양) · 직선 넉넉
const ROUTE = [
  [0, 0],
  [93, 7],
  [171, 61],
  [262, 48],
  [337, 112],
  [431, 101],
  [503, 160],
];

function columns(planned, lock = []) {
  const n = planned.length;
  return {
    planned,
    curveOn: planned.map(() => true),
    curveRadius: planned.map(() => null),
    curveLock: planned.map(() => null),
    curveArc: planned.map(() => null),
    apexLock: planned.map((_, i) => i === 0 || i === n - 1 || lock.includes(i)),
  };
}

function measure(planned, interval = INTERVAL) {
  const built = curve.buildEditedPolyline(
    planned,
    planned.map(() => true),
    planned.map(() => null),
    LIMITS.minRadiusM,
  );
  const spans = frame.curveSpans(built.vertices, built.curves);
  const mcs = spans.map(([a, b]) => (a + b) / 2);
  const total = frame.stationsAlong(built.vertices, INTERVAL, false);
  const length = built.vertices.reduce(
    (sum, v, i) =>
      i ? sum + Math.hypot(v[0] - built.vertices[i - 1][0], v[1] - built.vertices[i - 1][1]) : 0,
    0,
  );
  return {
    curves: built.curves.length,
    mcs,
    residues: mcs.map((mc) => Math.abs(mc - Math.round(mc / interval) * interval)),
    innerStations: total.filter((s) => s > 0 && s < length).length,
    off: fit.offStationCount(built.vertices, built.curves, interval),
  };
}

const moved = (a, b) => a.map((v, i) => Math.hypot(v[0] - b[i][0], v[1] - b[i][1]));

const before = measure(ROUTE);
const all = fit.fitCurveStations(columns(ROUTE), LIMITS, 1);
const locked = fit.fitCurveStations(columns(ROUTE, [3]), LIMITS, 1);
const fromLater = fit.fitCurveStations(columns(ROUTE), LIMITS, 4);
const everyLocked = fit.fitCurveStations(columns(ROUTE, [1, 2, 3, 4, 5]), LIMITS, 1);

console.log(
  JSON.stringify({
    before,
    all: { ...measure(all), moved: moved(ROUTE, all) },
    locked: { ...measure(locked), moved: moved(ROUTE, locked) },
    fromLater: { ...measure(fromLater), moved: moved(ROUTE, fromLater) },
    everyLocked: { ...measure(everyLocked), moved: moved(ROUTE, everyLocked) },
    again: moved(all, fit.fitCurveStations(columns(all), LIMITS, 1)),
    // 390-2 스냅 간격 — 0.1 · 1 · 10 m 배수 · 측점 밖 개수도 같은 간격
    steps: Object.fromEntries(
      [0.1, 1, 10].map((step) => {
        const fitted = fit.fitCurveStations(columns(ROUTE), { ...LIMITS, intervalM: step }, 1);
        const offBefore = measure(ROUTE, step).off;
        return [step, { offBefore, ...measure(fitted, step), moved: moved(ROUTE, fitted) }];
      }),
    ),
    tol: [0.1, 1, 10, 20].map((step) => fit.mcTolM(step)),
    noInterval: moved(ROUTE, fit.fitCurveStations(columns(ROUTE), { ...LIMITS, intervalM: 0 }, 1)),
    start: {
      moved4: fit.fitStart(
        columns(ROUTE),
        columns(ROUTE.map((v, i) => (i === 4 ? [v[0] + 1, v[1]] : v))),
      ),
      radius2: fit.fitStart(columns(ROUTE), {
        ...columns(ROUTE),
        curveRadius: ROUTE.map((_, i) => (i === 2 ? 40 : null)),
      }),
      dropLast: fit.fitStart(columns(ROUTE), columns(ROUTE.filter((_, i) => i !== 5))),
      same: fit.fitStart(columns(ROUTE), columns(ROUTE)),
      none: fit.fitStart(null, columns(ROUTE)),
    },
  }),
);