import { copyFileSync, existsSync, mkdirSync, readdirSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import { randomInt } from "node:crypto";

// 盲评用的汇总（任务书 14 第 3.2 节第 1 步最后一条）：把导出目录里每次运行的 text.txt 随机编成"运行 A、B……"，
// 只把这些文本放进 <检验目录>/blind/；对照表（字母 → 运行名）另存到 blind 外面的 blind-key.json，审阅者看不到。
//   node eval/round-one/blind.ts <export.ts 写出的检验目录>

const out = process.argv[2];
if (out === undefined) throw new Error("要写 export.ts 写出的检验目录");
const runs = readdirSync(join(out, "runs")).sort();
if (runs.length > 26) throw new Error(`有 ${runs.length} 次运行，字母不够用`);
const blind = join(out, "blind");
if (existsSync(blind)) throw new Error(`${blind} 已经有了：重新编号会让旧的对照表作废，先挪走`);
mkdirSync(blind);

// Fisher–Yates 洗牌，用 crypto 的随机数：编号不能从运行名或目录顺序推出来。
const order = [...runs];
for (let i = order.length - 1; i > 0; i--) {
  const j = randomInt(i + 1);
  [order[i], order[j]] = [order[j]!, order[i]!];
}
const key: Record<string, string> = {};
order.forEach((run, i) => {
  const letter = String.fromCharCode(65 + i);
  key[`运行 ${letter}`] = run;
  copyFileSync(join(out, "runs", run, "text.txt"), join(blind, `运行-${letter}.txt`));
});
writeFileSync(join(out, "blind-key.json"), `${JSON.stringify(key, null, 2)}\n`);
console.log(`${order.length} 份文本 → ${blind}\n对照表 → ${join(out, "blind-key.json")}`);