#!/usr/bin/env node
/**
 * 离线测试替身：模拟"外部编码 CLI agent"（真实子进程，非函数 mock）。
 * 接受 codex 风格 argv：exec [flags...] -C <workdir> <prompt...>，stdin 立即 EOF。
 * 从 prompt 中解析"建议文件名 <name>"，在 workdir 真实落盘一个确定性产物，exit 0。
 * 仅用于 GW_ORCH_OFFLINE=1 的离线 e2e；REAL 模式永远走真实 codex。
 */
import { mkdirSync, writeFileSync } from "node:fs";
import { resolve, dirname, join } from "node:path";

const argv = process.argv.slice(2);
let workdir = process.cwd();
for (let i = 0; i < argv.length; i++) {
  if (argv[i] === "-C" || argv[i] === "--cd" || argv[i] === "--cwd") { workdir = argv[++i]; }
}
const prompt = argv.filter((a) => !a.startsWith("-") && a !== "exec").join(" ");
const m = prompt.match(/建议文件名\s+([^\s）)]+)/);
const fname = m ? m[1] : "solution.mjs";
const fabs = resolve(workdir, fname);
mkdirSync(dirname(fabs), { recursive: true });

let body;
if (/\.(mjs|js)$/i.test(fname)) {
  body = [
    "#!/usr/bin/env node",
    "// fixture 外部 CLI 生成的确定性实现（离线 e2e 用；REAL 模式由真实 codex 生成）",
    "import { readFileSync } from 'node:fs';",
    "const args = Object.fromEntries(process.argv.slice(2).map((a) => { const [k, v] = a.replace(/^--/, '').split('='); return [k, v]; }));",
    "const top = Number(args.top || 5);",
    "const file = process.argv.slice(2).find((a) => !a.startsWith('--'));",
    "if (!file) { console.error('usage: node wordcount.mjs [--top=N] <file>'); process.exit(1); }",
    "const text = readFileSync(file, 'utf8');",
    "const words = text.toLowerCase().match(/[a-z0-9]+|[\u4e00-\u9fa5]{1,2}/g) || [];",
    "const freq = new Map();",
    "for (const w of words) freq.set(w, (freq.get(w) || 0) + 1);",
    "const ranked = [...freq.entries()].sort((a, b) => b[1] - a[1]).slice(0, top);",
    "for (const [w, c] of ranked) console.log(`${w}\t${c}`);",
    "",
  ].join("\n");
} else {
  body = `# fixture 产物（${fname}）\n\n由离线替身 CLI 依据子任务目标生成：\n\n${prompt.slice(0, 400)}\n`;
}
writeFileSync(fabs, body, "utf8");
// 若建议文件名是 README，再补一个最小占位，保证目录非空
if (/readme/i.test(fname)) writeFileSync(join(workdir, "USAGE.txt"), `usage fixture: node solution.mjs --top=5 samples/sample.txt\n`, "utf8");
console.log(`fixture-agent: wrote ${fname} (${body.length}B) into ${workdir}`);
process.exit(0);