/* 498-2 노선 바뀐 [저장] 계획고 손댐 — 진짜 TS(`logic/B05_Profile_Pipeline_Grade` follow · `gradeTouch`)를
 * Node 로 돌림. 표준출력 JSON 한 벌.
 */
const path = require("path");
const { makeLoader } = require("./helper_ts_stub_loader.cjs");

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

function loadTs(file, stubs = {}) {
  return makeLoader({
    root: ROOT,
    cache: false,
    requireFor: (full) => (request) => {
      if (stubs[request]) return stubs[request];
      throw new Error(`stub 없음: ${request} (${file})`);
    },
  }).loadTs(path.join(ROOT, file));
}

const straightJudge = loadTs("B05_Profile/logic/B05_Profile_Profile_Straight.ts");
const curveLaw = loadTs("B05_Profile/logic/B05_Profile_Profile_CurveLaw.ts");
const pivot = loadTs("B05_Profile/logic/B05_Profile_UI_Profile_Pivot.ts", {
  "./B05_Profile_Profile_Straight": straightJudge,
});
const alignment = loadTs("B05_Profile/logic/B05_Profile_UI_Profile_Alignment.ts", {
  "./B05_Profile_UI_Profile_Pivot": pivot,
  "./B05_Profile_Profile_Straight": straightJudge,
  "./B05_Profile_Profile_CurveLaw": curveLaw,
});
const carry = loadTs("B05_Profile/logic/B05_Profile_Grade_Carry.ts", {
  "./B05_Profile_UI_Profile_Alignment": alignment,
});
const grade = loadTs("B05_Profile/logic/B05_Profile_Pipeline_Grade.ts", {
  "./B05_Profile_Profile_CurveLaw": curveLaw,
  "../../common_util/common_util_route_follow": {},
  "../../common_util/common_util_structure_station": {
    PLUS_OWNER_PREFIX: "plus-",
    SAME_STATION_M: 0.005,
  },
  "./B05_Profile_Grade_Seat": loadTs("B05_Profile/logic/B05_Profile_Grade_Seat.ts", {
    "./B05_Profile_UI_Profile_Alignment": alignment,
  }),
  "./B05_Profile_UI_Profile_Alignment": alignment,
  "./B05_Profile_Grade_Carry": carry,
  "./B05_Profile_Sections_Stations": { SECTION_STATION_INTERVAL_M: 20 },
  "./B05_Profile_Grade_Ground": loadTs("B05_Profile/logic/B05_Profile_Grade_Ground.ts", {
    "./B05_Profile_Profile_CurveLaw": curveLaw,
    "./B05_Profile_UI_Profile_Alignment": alignment,
  }),
});

const routeOf = (line) => {
  const chainage = [0];
  for (let i = 1; i < line.length; i += 1)
    chainage.push(
      chainage[i - 1] + Math.hypot(line[i][0] - line[i - 1][0], line[i][1] - line[i - 1][1]),
    );
  return { line, curves: [], chainage, lengthM: chainage[chainage.length - 1] };
};
/** 10 m 격자 + 끝 — 묶음 stations 단계 자리. */
const gridOf = (route) => {
  const out = [];
  for (let s = 0; s < route.lengthM - 1e-6; s += 10) out.push(Math.round(s * 1000) / 1000);
  return [...out, Math.round(route.lengthM * 1000) / 1000];
};

const SAVED_LINE = [
  [0, 0],
  [100, 0],
  [100, 100],
  [100, 200],
];
const STEPS = [
  [
    [0, 0],
    [95, 0],
    [100, 100],
    [100, 200],
  ],
  [
    [0, 0],
    [90, 0],
    [100, 100],
    [100, 200],
  ],
];
const BASE = [0, 100, 200, 300].map((chainage_m) => ({ chainage_m, elevation_m: 500 }));
const SAVED = { station_offsets: { "250.000": 0.5 }, curve_radii: {} };

/** 저장 노선에서 노선 걸음 둘 — 걸음 사이 `between` 이 사용자 계획고 조작(묶음 입력 고침). */
function run(between, after) {
  const stage = grade.createFollowStage({
    savedLine: () => null,
    stationsAt: (route) => gridOf(route),
  });
  const planline = { policy: { station_interval_m: 20 }, basePvi: BASE };
  let now = SAVED;
  let before = routeOf(SAVED_LINE);
  let route = before;
  STEPS.forEach((line, index) => {
    route = routeOf(line);
    const patch = stage({
      inputs: { route: { nodes: [] }, pipes: null, structures: null, alignment: now },
      out: { route },
      before: { route: before, planline },
    });
    if (patch.alignment) now = patch.alignment;
    if (index === 0 && between) now = between(now);
    before = route;
  });
  if (after) now = after(now);
  const reader = {
    input: (key) => ({ route: { nodes: [] }, alignment: now })[key] ?? null,
    output: (key) => (key === "route" ? route : null),
  };
  return { now, touch: stage.touch(SAVED, reader) };
}

const bump = (key, by) => (edits) => ({
  ...edits,
  station_offsets: { ...edits.station_offsets, [key]: (edits.station_offsets[key] ?? 0) + by },
});
const drop = (edits) => {
  const offsets = { ...edits.station_offsets };
  delete offsets[Object.keys(offsets).sort()[0]];
  return { ...edits, station_offsets: offsets };
};

process.stdout.write(
  JSON.stringify({
    plain: run(null, null),
    lateBump: run(null, bump("60.000", 0.3)),
    midBump: run(bump("40.000", 0.2), null),
    removed: run(null, drop),
    noFirst: grade.createFollowStage({ savedLine: () => null }).touch(SAVED, {
      input: () => null,
      output: () => null,
    }),
    pure: grade.gradeTouch(
      { station_offsets: { "10.000": 1, "20.000": 2.5 }, curve_radii: { "30.000": 80 } },
      { station_offsets: { "10.000": 1, "20.000": 2, "40.000": 3 }, curve_radii: {} },
    ),
  }),
);