/* 298-3 노선 [저장] 뒤 렌더러 멈춤 단위검증 헬퍼 — `design_pipeline_page.ts` 의 `finishDrop` 본문을
 * 그대로 떼어 트랜스파일 · 둘레 칸은 가짜. 밀린 버림 기록(dropped · 옛 차례)을 넘기고 lastRun 이 같은 기록을
 * 되돌려 줄 때 finishDrop 이 몇 번 불리는지 · 끝나는지. 결과 JSON 을 stdout 으로.
 */
const fs = require("fs");
const path = require("path");
const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));

const ROOT = path.join(__dirname, "..", "..");
const code = fs.readFileSync(
  path.join(ROOT, "A00_Common", "design", "design_pipeline_page.ts"),
  "utf8",
);
const begin = code.indexOf("const finishDrop = async");
const end = code.indexOf("\n  };", begin) + 5;
if (begin < 0 || end < begin) throw new Error("finishDrop 못 찾음");
const body = code
  .slice(begin, end)
  .replace("const finishDrop = async", "const finishDropInner = async");

const harness = `
let calls = 0;
const finishDrop = (record: any): Promise<string> => {
  calls += 1;
  if (calls > 50) return Promise.reject(new Error("loop"));
  return finishDropInner(record);
};
${body}
return { finishDrop, calls: () => calls };
`;
const js = ts
  .transpileModule(`(function () {${harness}})`, {
    compilerOptions: { target: ts.ScriptTarget.ES2022 },
  })
  .outputText.replace(/^"use strict";/, "");

const record = { outcome: "dropped", generation: 3 };
const pipe = { generation: 5, input: () => null, output: () => null };
let released = 0;
const scope = {
  pipe,
  dropPending: true,
  lastRun: Promise.resolve(record), // 이미 끝난 같은 차례 기록
  pageSaved: { canonRouteId: () => 7, adoptCanon() {} },
  held: null,
  options: {},
  heldSectionDetail: () => null,
  stationDiff: () => null,
  adoptAfterDrop() {},
  publisher: { shown: async () => undefined },
  releaseWhenQuiet: async () => void (released += 1),
};
const names = Object.keys(scope);
const make = new Function(
  "scope",
  `let { ${names.join(", ")} } = scope;\nreturn ${js.trim().replace(/;$/, "")}();`,
);
const { finishDrop, calls } = make(scope);

finishDrop(record).then(
  (why) => console.log(JSON.stringify({ calls: calls(), why, released, record })),
  (error) => console.log(JSON.stringify({ calls: calls(), error: String(error), released })),
);