/* 493-3 화면 ↔ 저장 자리 거울 — 진짜 TS(`common_util_route_follow`)로 교점 끌기 여러 걸음을 브라우저처럼 돌림.
 * 입력 argv[2] JSON = { lines: [L0(저장 노선), L1, …, Ln(마지막 끌기)], pipes, structures, plus, interval }.
 * 걸음마다(브라우저 follow 단계 · design_pipeline_page.ts · B05_Profile_Pipeline_Grade.ts) 앞 선에서 자리
 * 붙임(placeOnLine) → 새 선 따라감 · 추가 측점 = 누가거리 목록(세션) + 땅 위 자리(첫 걸음 = 저장분 `plus` 좌표 ·
 * 다음 = 앞 걸음 줄 · `followPlusGround`) · `input.oldPlus` 면 고치기 전 셈(좌표 없이 걸음마다 다시 놓음).
 * 표준출력 = 마지막 화면 값.
 */
const fs = require("fs");
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 catalog = require("./helper_322_catalog_module.cjs");
const station = loadTs("common_util/common_util_structure_station.ts", {
  "./common_util_structure_catalog": catalog,
});
const follow = loadTs("common_util/common_util_route_follow.ts", {
  "./common_util_structure_station": station,
});

const input = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
const lines = input.lines.map((line) => line.map(([x, y]) => ({ x, y })));
const saved = input.pipes;
let pipes = input.pipes;
let structures = input.structures;
let plus = input.plus.map((row) => row.chainage_m);
let ground = input.plus;
let followed = [];
for (let i = 0; i + 1 < lines.length; i += 1) {
  const placedPipes = follow.placeOnLine(pipes, lines[i], [...saved, ...followed]);
  pipes = follow.projectPipePoints(placedPipes, lines[i + 1]);
  followed = pipes;
  const placed = follow.placeOnLine(structures, lines[i], [], input.interval);
  structures = follow
    .followStructures(placed, lines[i + 1], undefined, input.interval)
    .map((moved) => moved.item);
  if (input.oldPlus) {
    plus = follow.followPlusStations(plus, lines[i], lines[i + 1]);
    continue;
  }
  ground = follow.followPlusGround(plus, lines[i], lines[i + 1], ground);
  plus = ground.map((row) => row.chainage_m);
}
process.stdout.write(JSON.stringify({ pipes, structures, plus }));