#!/usr/bin/env node
/**
 * PoC：最小执行闭环（DESIGN.md §14.1）
 *
 * 临时 git repo + 临时 daemon(:4528, 独立 MAESTRO_DATA_DIR) + autonomy=auto-easy
 * + 一个 Easy 任务（operations=「在 README.md 追加一行 hello maestro」）
 * → 等编排器在 worktree 真起 headless Claude Code 跑完
 * → 断言：任务到 exec_review、maestro/<taskId> 分支上有 commit、README 真的被改了。
 *
 * 前提：本机有 claude 凭证（claude CLI 已登录或 ANTHROPIC_API_KEY），网络可用。
 * 不碰 4517 线上 daemon 与 ~/.maestro（数据目录走临时 MAESTRO_DATA_DIR）。
 *
 * 用法：node scripts/poc-exec.mjs   （在 maestro 仓库根目录）
 */
import { execFileSync, spawn } from 'node:child_process';
import { mkdtempSync, rmSync, readFileSync, writeFileSync, existsSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = dirname(dirname(fileURLToPath(import.meta.url)));
const PORT = 4528;
const BASE = `http://127.0.0.1:${PORT}`;
const ORCH_INTERVAL = 3;          // 秒
const EXEC_TIMEOUT_MS = 8 * 60_000;

const log = (m) => console.log(`[poc] ${m}`);
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

function git(cwd, args) {
  return execFileSync('git', args, { cwd, encoding: 'utf8' });
}

async function api(method, path, body) {
  const res = await fetch(`${BASE}${path}`, {
    method,
    headers: { 'content-type': 'application/json' },
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  const text = await res.text();
  if (!res.ok) throw new Error(`${method} ${path} → ${res.status}: ${text}`);
  return text ? JSON.parse(text) : null;
}

async function main() {
  // 0) 临时目录
  const dataDir = mkdtempSync(join(tmpdir(), 'maestro-poc-data-'));
  const repo = mkdtempSync(join(tmpdir(), 'maestro-poc-repo-'));

  // 1) 临时 git repo（main + README）
  git(repo, ['init', '-b', 'main']);
  git(repo, ['config', 'user.name', 'maestro-poc']);
  git(repo, ['config', 'user.email', 'poc@maestro.local']);
  writeFileSync(join(repo, 'README.md'), '# poc demo\n');
  git(repo, ['add', '-A']);
  git(repo, ['commit', '-m', 'init']);
  log(`临时 repo：${repo}`);
  log(`临时数据目录：${dataDir}`);

  // 2) 起临时 daemon（:4528，编排器 3s 一轮，定时同步关闭）
  const daemon = spawn('npx', ['tsx', 'src/daemon/index.ts'], {
    cwd: ROOT,
    env: {
      ...process.env,
      MAESTRO_DATA_DIR: dataDir,
      MAESTRO_PORT: String(PORT),
      MAESTRO_ORCH_INTERVAL: String(ORCH_INTERVAL),
      MAESTRO_SYNC_INTERVAL: '0',
    },
    stdio: ['ignore', 'pipe', 'pipe'],
  });
  daemon.stdout.on('data', (d) => process.stdout.write(`[daemon] ${d}`));
  daemon.stderr.on('data', (d) => process.stderr.write(`[daemon!] ${d}`));

  const cleanup = (keep) => {
    daemon.kill('SIGTERM');
    if (!keep) {
      rmSync(dataDir, { recursive: true, force: true });
      rmSync(repo, { recursive: true, force: true });
    } else {
      log(`保留现场：repo=${repo} dataDir=${dataDir}`);
    }
  };

  try {
    // 等 daemon 就绪
    let up = false;
    for (let i = 0; i < 40; i++) {
      try { await api('GET', '/api/projects'); up = true; break; } catch { await sleep(500); }
    }
    if (!up) throw new Error('daemon 未就绪（:4528）');
    log('daemon 就绪');

    // 3) 注册项目（auto-easy）+ Easy 任务 + operations
    const project = await api('POST', '/api/projects', {
      name: 'poc', repoPath: repo, defaultBranch: 'main', autonomy: 'auto-easy', concurrency: 1,
    });
    const task = await api('POST', `/api/projects/${project.id}/tasks`, {
      title: '在 README.md 追加一行 hello maestro', complexity: 'easy',
    });
    await api('POST', `/api/tasks/${task.id}/operations`, {
      operations: '在仓库根目录的 README.md 末尾追加一行文本「hello maestro」。不要做其他任何改动。',
    });
    log(`任务已建：${task.id}（ready，等编排器领取）`);

    // 4) 轮询直到 exec_review / needs_attention / 超时
    const t0 = Date.now();
    let cur = null;
    for (;;) {
      await sleep(3000);
      cur = await api('GET', `/api/tasks/${task.id}`);
      log(`任务状态：${cur.status}`);
      if (cur.status === 'exec_review' || cur.status === 'needs_attention') break;
      if (Date.now() - t0 > EXEC_TIMEOUT_MS) throw new Error(`超时（>${EXEC_TIMEOUT_MS / 1000}s），最后状态：${cur.status}`);
    }

    if (cur.status !== 'exec_review') {
      const runs = await api('GET', `/api/tasks/${task.id}/runs`);
      throw new Error(`任务进入 ${cur.status}（非 exec_review）。runs=${JSON.stringify(runs, null, 2)}`);
    }

    // 5) 断言：result 落库、分支有 commit、文件真的改了、main 未被动过
    const branch = `maestro/${task.id}`;
    if (cur.result?.branch !== branch) throw new Error(`result.branch 异常：${JSON.stringify(cur.result)}`);
    const commits = git(repo, ['log', '--format=%h %s', `main..${branch}`]).trim().split('\n').filter(Boolean);
    if (commits.length < 1) throw new Error(`分支 ${branch} 上没有 commit`);
    const readmeOnBranch = git(repo, ['show', `${branch}:README.md`]);
    if (!readmeOnBranch.includes('hello maestro')) throw new Error(`分支上的 README 未包含「hello maestro」：\n${readmeOnBranch}`);
    const readmeOnMain = readFileSync(join(repo, 'README.md'), 'utf8');
    if (readmeOnMain.includes('hello maestro')) throw new Error('main 的 README 被改了（不应自动合并）');
    if (cur.result.worktree && !existsSync(cur.result.worktree)) throw new Error('worktree 现场不存在');

    log('================ PoC 通过 ✅ ================');
    log(`任务 → exec_review；分支 ${branch} 共 ${commits.length} 个 commit：`);
    for (const c of commits) log(`  ${c}`);
    log(`diffSummary: ${cur.result.diffSummary}`);
    log('main 未被自动合并（符合「绝不自动合并」）');
    cleanup(false);
    process.exit(0);
  } catch (e) {
    console.error(`[poc] 失败：${e.message}`);
    cleanup(true);
    process.exit(1);
  }
}

main();