/* 451 헬퍼(433-16) — 세션 상세 판 확인: 진짜 상세 가게(`B06_Section_Section_Store`)가 세션 한 벌로 먼저 서고
 * 뒤에서 서버 판을 물음 · 다르면 서버 값 위에 이 탭에서 고친 사용자 칸만 · 같으면 그대로 · 노선 초안 hold 는 버릴 때
 * 새 판. 서버 창구 · 초안 얹기 · 열쇠는 가짜. 짝 = `test_451_session_canon.py`.
 */
const fs = require("fs");
const path = require("path");
const { makeLoader } = require("./helper_ts_stub_loader.cjs");
const CATALOG = require("./helper_322_catalog_module.cjs");

const ROOT = path.join(__dirname, "..", "..");
const P = "P451";
const ROUTE = 3;

function memoryStorage() {
  const map = new Map();
  return {
    getItem: (k) => (map.has(k) ? map.get(k) : null),
    setItem: (k, v) => map.set(k, String(v)),
    removeItem: (k) => map.delete(k),
    key: (i) => [...map.keys()][i] ?? null,
    get length() {
      return map.size;
    },
  };
}
globalThis.window = { sessionStorage: memoryStorage(), localStorage: memoryStorage() };

const anyModule = (extra = {}) =>
  new Proxy(extra, { get: (t, key) => (key in t ? t[key] : () => undefined) });

/** 서버 — 부를 때마다 지금 `server` 사본 · `gate` 가 풀릴 때 답함. */
let server = null;
let gate = Promise.resolve();
let asked = 0;
const keyAt = (sections) => sections.map((s) => `at:${s.chainage_m.toFixed(2)}`);
const STUBS = {
  "design_pipeline_page.ts": {
    reconcilePagePipeline: async () => 0,
    pipelineOwnsCross: () => false,
    pagePipeline: () => null,
  },
  "design_pipeline_cross.ts": { forceCross: () => undefined },
  "B06_Section_Section_Drafts.ts": {
    forgetDraftStations: () => undefined,
    withDraftShapes: async () => undefined,
    withDraftStations: async () => undefined,
    supersedeDraftStations: () => undefined,
  },
  "B05_Profile_Api_PlusStations.ts": {
    loadSavedPlusStations: async () => undefined,
    plusStationsOf: () => [],
  },
  "B06_Section_Api_Fetch.ts": anyModule({
    fetchSectionDetail: async () => {
      asked += 1;
      await gate;
      return JSON.parse(JSON.stringify(server));
    },
  }),
  "B06_Section_Api_Culvert_Options.ts": anyModule({ STRUCTURE_ADJUST_KEYS: [] }),
  "B06_Section_Swap_Bus.ts": anyModule(),
  "B06_Section_Station_Keys.ts": anyModule({
    KEYED_STATES: [],
    registeredKeys: (_p, _r, sections) => keyAt(sections),
    stationIntervalOf: () => 20,
  }),
  "B06_Section_UI_Page_Persist.ts": anyModule({ readCutSlopeSession: () => ({}) }),
  "B06_Section_UI_Standard_Panel.ts": anyModule(),
  "B06_Section_Cross_Design_Session.ts": anyModule({ crossDesignChoices: () => new Map() }),
  "B06_Section_Section_Adjusts.ts": anyModule({ withPipeOptions: async () => undefined }),
  "common_util_cross_design.ts": anyModule(),
  "B06_Section_Cross_Culvert_Wire.ts": anyModule(),
  "B06_Section_Cross_Ford_Geom.ts": anyModule(),
  "B06_Section_Cross_Box_Geom.ts": anyModule(),
  "B06_Section_UI_IrregularStations.ts": anyModule({ PIPE_DISPLAY_NAME: {} }),
  "B05_Profile_UI_IrregularStations.ts": anyModule({ PIPE_DISPLAY_NAME: {} }),
  "config_frontend.ts": anyModule({ PIPE_TYPES: [] }),
};

const resolve = (base) =>
  [base, `${base}.ts`, path.join(base, "index.ts")].find(
    (p) => fs.existsSync(p) && fs.statSync(p).isFile(),
  ) ?? `${base}.ts`;
const { loadTs } = makeLoader({
  root: ROOT,
  interop: true,
  fileStub: (full) => STUBS[path.basename(full)],
  requireFor: (full) => (request) => {
    if (CATALOG.isCatalogRequest(request)) return CATALOG;
    const alias = { "@util/": "common_util", "@ui/": "ui_template", "@config/": "config" };
    for (const [prefix, dir] of Object.entries(alias))
      if (request.startsWith(prefix))
        return loadTs(resolve(path.join(ROOT, dir, request.slice(prefix.length))));
    return loadTs(resolve(path.join(path.dirname(full), request)));
  },
});

const store = loadTs(path.join(ROOT, "B06_Section", "B06_Section_Section_Store.ts"));
const state = loadTs(path.join(ROOT, "A00_Common", "b_page_state.ts"));
const tick = () => new Promise((r) => setTimeout(r, 10));

/** 정본 — 측점 0 · 20 · 40 · 60 · 측점 20 집수정 조절 · 40 메모 · 계획고. */
const canon = (adjust, note, elevation) => ({
  longitudinal: { design_profiles: [], stations: [] },
  cross_sections: [0, 20, 40, 60].map((c) => ({
    chainage_m: c,
    kind: c === 0 ? "bp" : "regular",
    samples: [],
    design: {
      design_elevation_m: elevation,
      ...(c === 20 ? { basin_adjust: { x: adjust } } : {}),
      ...(c === 40 ? { structure_note: note } : {}),
    },
  })),
});
const designAt = (detail, c) => detail.cross_sections.find((s) => s.chainage_m === c).design;
const patchAt = (patches, c) => patches.find((p) => p.chainage_m === c) ?? null;
const sessionNow = () => state.readState("section-detail", P, ROUTE);
const open = () => {
  let release;
  gate = new Promise((r) => (release = r));
  return release;
};

(async () => {
  const out = {};
  // ① 낡은 세션(조절 1 · 메모 A · 계획고 100) + 다른 탭이 저장(조절 2 · 계획고 101) → 새 탭(새로고침)
  state.writeState("section-detail", canon(1, "A", 100), P, ROUTE);
  server = canon(2, "A", 101);
  let release = open();
  let heard = 0;
  store.subscribeSectionDetail(P, ROUTE, () => (heard += 1));
  const first = await store.loadSectionDetail(P, ROUTE);
  out.firstFromSession = designAt(first, 20).basin_adjust.x === 1 && asked === 1;
  // 서버가 답하기 전 이 탭에서 고친 칸 — 측점 40 메모
  designAt(first, 40).structure_note = "mine";
  release();
  await tick();
  const now = store.peekSectionDetail(P, ROUTE);
  const patches = store.cachedCrossPatches(P, ROUTE);
  out.stale = {
    swapped: now !== first,
    heard,
    adjust: designAt(now, 20).basin_adjust.x,
    elevation: designAt(now, 60).design_elevation_m,
    note: designAt(now, 40).structure_note,
    patchAdjust: patchAt(patches, 20)?.basin_adjust?.x ?? null,
    patchNote: patchAt(patches, 40)?.structure_note ?? null,
    sessionAdjust: designAt(sessionNow(), 20).basin_adjust.x,
    sessionNote: designAt(sessionNow(), 40).structure_note,
  };

  // ② 같은 판 — 새로고침(메모리 비움 흉내) · 서버 = 세션 → 그대로(갈아끼움 · 알림 없음)
  store.invalidateSectionDetail(P, ROUTE);
  state.writeState("section-detail", server, P, ROUTE);
  release = open();
  heard = 0;
  const again = await store.loadSectionDetail(P, ROUTE);
  release();
  await tick();
  out.same = { kept: store.peekSectionDetail(P, ROUTE) === again, heard };

  // ③ 서버 실패 · 엉뚱한 답 — 세션 그대로
  store.invalidateSectionDetail(P, ROUTE);
  state.writeState("section-detail", canon(1, "A", 100), P, ROUTE);
  const saved = server;
  server = null;
  release = open();
  const broken = await store.loadSectionDetail(P, ROUTE);
  release();
  await tick();
  out.broken = store.peekSectionDetail(P, ROUTE) === broken;
  server = saved;

  // ④ 노선 초안 hold(옛 상세) · 갈아끼움 뒤 서버가 답함 → 초안을 버리면 새 판
  store.invalidateSectionDetail(P, ROUTE);
  state.writeState("section-detail", canon(1, "A", 100), P, ROUTE);
  release = open();
  const held = await store.loadSectionDetail(P, ROUTE);
  const hold = store.holdSectionDetail(P, ROUTE, held);
  const draftStations = [0, 25, 45, 60].map((c) => ({
    key: `at:${c}`,
    chainageM: c,
    kind: "grid",
    x: c,
    y: 0,
    left: [0, 1],
    azimuthDeg: 0,
    ground: null,
  }));
  await store.swapSectionStations(P, ROUTE, draftStations);
  const swappedDraft = store.peekSectionDetail(P, ROUTE) !== held;
  release();
  await tick();
  const draftKept = store.peekSectionDetail(P, ROUTE).cross_sections.map((s) => s.chainage_m);
  const back = await store.restoreSectionDetail(
    P,
    ROUTE,
    hold,
    [0, 20, 40, 60].map((c) => ({ key: `at:${c}`, chainageM: c })),
  );
  out.hold = {
    swappedDraft,
    draftKept,
    renewed: back && back.detail !== held,
    adjust: back && designAt(back.detail, 20).basin_adjust.x,
    same: back && back.same,
  };
  process.stdout.write(JSON.stringify(out));
})().catch((error) => {
  process.stderr.write(String(error && error.stack ? error.stack : error));
  process.exit(1);
});