/**
 * DevLoop · LoopController
 *
 * P0 已提供:
 *   - createProject({ company_id, mode, target_path, idea }) — 项目分配 + git init
 *   - commitAfterAgent(pid, agentName, summary) — Agent 收尾自动 commit
 *
 * P1 新增 (Docs MVP):
 *   - runDocsPhase(pid, requirement, opts) — 串行跑 PM → Architect (mock 模式),
 *     把 fixture.files 落盘到项目根,每个 Agent 收尾自动 commit
 *   - callAgent(pid, agentName, prompt, opts) — 单次 Agent 调用 (P1 仅支持 mock 模式)
 *
 * 规格:
 *   - docs/prd/newfunction/_spec/sdd-process.md · P-10 GitCommit
 *   - docs/prd/newfunction/_spec/arch-git-versioning.md
 *   - docs/prd/newfunction/_spec/arch-project-root.md
 *   - docs/prd/newfunction/_spec/plan-migration.md · P1 Docs MVP
 */

const fs = require('fs');
const path = require('path');

const pathResolver = require('../../../services/devloop/path-resolver');
const gitVault = require('../../../services/devloop/git-vault');
const timelineLogger = require('../../../services/devloop/timeline-logger');
const unitRegistry = require('../../../services/devloop/unit-registry');
const bugTracker = require('../../../services/devloop/bug-tracker');
const changelogWriter = require('../../../services/devloop/changelog-writer');
const sseBroker = require('../../../services/devloop/sse-broker');
const docStore = require('../../../services/devloop/doc-store');
const { ClaudeCliProtocol } = require('../../../../packages/acp-core/protocol/ClaudeCliProtocol');

// 注入依赖:让 unit-registry / bug-tracker 内的 SSE/Timeline 调用都能落地
unitRegistry.attachSseBroker(sseBroker);
bugTracker.attachSseBroker(sseBroker);
bugTracker.attachTimelineLogger(timelineLogger);

const TEMPLATES_DIR = path.resolve(__dirname, '../../../../system/templates');

/**
 * 新建项目:
 *   1. allocateProjectRoot (sandbox / linked-new)
 *   2. 写 project.json (最小元数据)
 *   3. gitVault.init + 写 .gitignore (gitVault 内置 DEFAULT_GITIGNORE)
 *   4. 首次 commit "chore: init project"
 */
async function createProject({ company_id, mode = 'sandbox', target_path, idea = '' }) {
  if (!company_id) throw new Error('company_id required');

  const { pid, root_path } = pathResolver.allocateProjectRoot({
    company_id, mode, target_path,
  });

  // project.json (含 P4 status FSM 字段)
  const meta = {
    pid,
    company_id,
    mode,
    created_at: new Date().toISOString(),
    idea_summary: (idea || '').slice(0, 200),
    status: 'draft', // FSM: draft → running → shipped → shipped-final | abandoned
    status_updated_at: new Date().toISOString(),
  };
  fs.writeFileSync(
    pathResolver.resolveProjectJson(pid),
    JSON.stringify(meta, null, 2)
  );

  // git init (内置首个 init commit) — gitVault.init 已自己做 commit
  await gitVault.init(pid, {
    summary: idea ? idea.slice(0, 80) : `init ${pid}`,
  });

  // timeline (写在 init 之后,作为"项目创建"事件)
  try {
    timelineLogger.append(pid, {
      source: 'system',
      kind: 'project.created',
      ref: pid,
      summary: `Project ${pid} created (${mode})`,
      payload: { company_id, mode, root_path },
    });
  } catch (e) {
    console.warn('[LoopController] timeline append failed:', e.message);
  }

  // 把 project.json + timeline.ndjson 一并提交进第二个 commit (工作树留干净)
  const firstCommit = await gitVault.commit(pid, {
    kind: 'chore',
    summary: `chore: project metadata + first timeline entry for ${pid}`,
    author: { name: 'devloop-system', email: 'devloop@local' },
  });

  return { pid, root_path, mode, first_commit: firstCommit };
}

/**
 * Agent 结束后,把工作树新文件 auto-commit。
 * 调用方一般在 stream-executor 完成或 agent-manager.post-task-success 时调。
 *
 * @param {string} pid
 * @param {string} agentName  (devloop-pm / devloop-architect / ...)
 * @param {string} summary    一句话描述本次产出 (做 commit message 副标题)
 * @returns {{ sha, files_changed }} 或 null (无变更时)
 */
async function commitAfterAgent(pid, agentName, summary = '') {
  // commit kind 推断
  const kindMap = {
    'devloop-pm': 'prd',
    'devloop-architect': 'sdd',
    'devloop-coder': 'code',
    'devloop-tester': 'code',
    'devloop-integrator': 'integ',
    'devloop-triager': 'triage',
  };
  const kind = kindMap[agentName] || 'chore';
  const msg = `${kind}(${agentName}): ${summary || 'agent update'}`;
  const commit = await gitVault.commit(pid, {
    kind,
    summary: msg,
    author: { name: agentName, email: `${agentName}@devloop.local` },
  });

  if (commit.skipped) {
    return null;
  }

  try {
    timelineLogger.append(pid, {
      source: agentName,
      kind: 'git.commit',
      ref: commit.sha,
      summary: msg.slice(0, 200),
      payload: { sha: commit.sha },
    });
  } catch { /* swallow */ }

  return commit;
}

/**
 * 单次 Agent 调用 (P1 mock 实现):
 *   1. 读 system/templates/{agentName}/prompt.md (系统提示)
 *   2. 用 ClaudeCliProtocol(mock=true) 跑一遍
 *   3. 收集 chunks / files / result
 *   4. 把 fixture.files 落盘到项目根
 *   5. 触发 commitAfterAgent
 *
 * @param {string} pid
 * @param {string} agentName  e.g. "devloop-pm"
 * @param {string} userPrompt 用户/上一步追加的提示
 * @param {object} opts
 *   - onChunk?: (text) => void   流式回调
 *   - mock?: boolean             默认走 LEMONBOSS_CLAUDE_MODE=mock
 *   - skipCommit?: boolean       默认 false
 * @returns { ok, agent, files_written, commit, result_text }
 */
async function callAgent(pid, agentName, userPrompt, opts = {}) {
  const projectRoot = pathResolver.resolveProjectRoot(pid);

  // 1. 系统提示 (可选 — 没文件就空串)
  const promptPath = path.join(TEMPLATES_DIR, agentName, 'prompt.md');
  const systemPrompt = fs.existsSync(promptPath)
    ? fs.readFileSync(promptPath, 'utf8')
    : '';
  const fullPrompt = systemPrompt
    ? `${systemPrompt}\n\n## User Task\n${userPrompt}`
    : userPrompt;

  // 2. 启动 protocol
  const protocol = new ClaudeCliProtocol(
    { name: agentName },
    {
      mock: opts.mock !== false, // 默认 mock=true (P1+ 阶段)
      mockFixtureDir: opts.mockFixtureDir, // 可选,P3 scenario 测试用
    },
  );

  let resultParams = null;
  const filesFromMock = [];
  protocol.on('session_update', (u) => {
    if (u.update?.sessionUpdate === 'agent_message_chunk' && opts.onChunk) {
      opts.onChunk(u.update.content.text);
    }
  });
  protocol.on('acp_event', (ev) => {
    if (ev.method === 'session/result') resultParams = ev.params;
    else if (ev.method === 'mock/files' && Array.isArray(ev.params?.files)) {
      filesFromMock.push(...ev.params.files);
    }
  });

  try {
    await protocol.connect(null, projectRoot);
    await protocol.sendPrompt(fullPrompt);
  } finally {
    protocol.disconnect();
  }

  // 3. 落盘 fixture.files (path 相对 projectRoot)
  const filesWritten = [];
  for (const f of filesFromMock) {
    if (!f?.path || typeof f.content !== 'string') continue;
    if (path.isAbsolute(f.path) || f.path.includes('..')) {
      throw new Error(`unsafe mock file path: ${f.path}`);
    }
    const abs = path.join(projectRoot, f.path);
    fs.mkdirSync(path.dirname(abs), { recursive: true });
    let content = f.content;
    // 把 fixture 里的占位符替换成实际值 ({{pid}} / "_placeholder_")
    if (f.path === 'units.json' || f.path.endsWith('/units.json')) {
      try {
        const u = JSON.parse(content);
        u.project_id = pid;
        content = JSON.stringify(u, null, 2);
      } catch { /* leave as-is, downstream will fail validation */ }
    }
    fs.writeFileSync(abs, content);
    filesWritten.push(f.path);
  }

  // 4. timeline + commit
  try {
    timelineLogger.append(pid, {
      source: agentName,
      kind: 'agent.call',
      ref: resultParams?.session_id || 'mock',
      summary: (resultParams?.result || '').slice(0, 200) || `${agentName} ran (mock)`,
      payload: { files_written: filesWritten.length, mock: !!resultParams?.mock },
    });
  } catch { /* swallow */ }

  let commit = null;
  if (!opts.skipCommit) {
    const summary = (resultParams?.result || '').slice(0, 80) || `${agentName} produced ${filesWritten.length} files`;
    commit = await commitAfterAgent(pid, agentName, summary);
  }

  return {
    ok: true,
    agent: agentName,
    files_written: filesWritten,
    commit,
    result_text: resultParams?.result || '',
    mock: !!resultParams?.mock,
  };
}

/**
 * Docs phase (P1): PM → Architect 串行跑。
 *
 * @param {string} pid
 * @param {string} requirement 用户原始需求一段话
 * @param {object} opts
 *   - onChunk?: (agent, text) => void
 * @returns { ok, pm, architect }
 */
async function runDocsPhase(pid, requirement, opts = {}) {
  if (!requirement || typeof requirement !== 'string') {
    throw new Error('requirement (string) required');
  }

  // Docs 是项目第一步 — reset mock 计数,确保 PM/Architect 从 seq 0 开始
  if (opts.resetMockSequence !== false) {
    ClaudeCliProtocol.resetMockState();
  }

  const onChunk = opts.onChunk
    ? (agent) => (text) => opts.onChunk(agent, text)
    : null;
  const passthrough = {
    mock: opts.mock !== false,
    mockFixtureDir: opts.mockFixtureDir,
  };

  const pm = await callAgent(pid, 'devloop-pm',
    `Requirement:\n${requirement}\n\nmode: init`,
    { ...passthrough, onChunk: onChunk ? onChunk('devloop-pm') : undefined });

  const architect = await callAgent(pid, 'devloop-architect',
    `Read prd/ from project root and produce SDD + units.json + integration/spec.json.\nRequirement context:\n${requirement}`,
    { ...passthrough, onChunk: onChunk ? onChunk('devloop-architect') : undefined });

  // timeline 总结
  try {
    timelineLogger.append(pid, {
      source: 'system',
      kind: 'docs.complete',
      ref: pid,
      summary: `Docs phase complete: PM (${pm.files_written.length} files) + Architect (${architect.files_written.length} files)`,
      payload: {
        pm_files: pm.files_written.length,
        architect_files: architect.files_written.length,
      },
    });
  } catch { /* swallow */ }

  // P4: 项目进入 running 态(完成 docs 后,准备进 L1/L2)
  _setProjectStatus(pid, 'running', { reason: 'docs_complete' });

  return { ok: true, pm, architect };
}

/**
 * 读项目当前状态 (P1 用,routes/devloop.js GET /state 后端):
 *   - project.json
 *   - units.json (if any)
 *   - PRD/SDD revs (扫 article[data-rev] 最大值)
 *   - 最近一次 commit
 *   - timeline 最近 5 条
 *   - bugs 计数
 */
function getProjectState(pid) {
  const root = pathResolver.resolveProjectRoot(pid);
  const out = { pid, root_path: root };

  const projectJson = pathResolver.resolveProjectJson(pid);
  if (fs.existsSync(projectJson)) {
    try {
      out.project = JSON.parse(fs.readFileSync(projectJson, 'utf8'));
      out.status = out.project.status || 'unknown';
    } catch {}
  }

  const unitsJson = pathResolver.resolveUnitsJson(pid);
  if (fs.existsSync(unitsJson)) {
    try {
      const u = JSON.parse(fs.readFileSync(unitsJson, 'utf8'));
      out.units = u.units || [];
      out.units_rev = u.rev || 0;
    } catch {}
  }

  // PRD/SDD rev = 站点根 index.html 的 article[data-rev]
  for (const kind of ['prd', 'sdd']) {
    const idx = path.join(root, kind, 'index.html');
    if (fs.existsSync(idx)) {
      const html = fs.readFileSync(idx, 'utf8');
      const m = html.match(/<article[^>]*data-doc="(prd|sdd)"[^>]*data-rev="(\d+)"/);
      out[`${kind}_rev`] = m ? parseInt(m[2], 10) : 1;
      out[`${kind}_site`] = true;
    } else {
      out[`${kind}_site`] = false;
    }
  }

  // timeline tail
  const tl = pathResolver.resolveTimelineLog(pid);
  if (fs.existsSync(tl)) {
    const lines = fs.readFileSync(tl, 'utf8').trim().split('\n').filter(Boolean);
    out.timeline_tail = lines.slice(-5).map(l => {
      try { return JSON.parse(l); } catch { return null; }
    }).filter(Boolean);
  }

  return out;
}

/**
 * runUnit — L1 单 Unit 循环 (P2)。
 *
 * 串行 Coder(implement) → Tester(test)。失败时 retryWithReflection 把
 * 上一次 failure + coder.log 摘要打回去重跑 Coder + Tester,直到通过或耗
 * 尽 retry_budget。每个状态转换走 unit-registry FSM。
 *
 * @param {string} pid
 * @param {string} unitId
 * @param {object} opts
 *   - mock?: boolean (默认 true,P2 阶段)
 *   - onChunk?: (agent, text) => void
 *   - resetMockSequence?: boolean (默认 true,跑前清零 fixture sequence 计数)
 * @returns { ok, unit_id, attempts, final_state, history: [{ agent, attempt, ... }] }
 */
async function runUnit(pid, unitId, opts = {}) {
  if (opts.resetMockSequence !== false) {
    ClaudeCliProtocol.resetMockState();
  }

  const unit = unitRegistry.get(pid, unitId);
  const budget = unit.retry_budget || 5;
  const history = [];
  let attempt = 0;
  let finalOk = false;

  while (attempt < budget) {
    attempt++;

    // ── coding ───────────────────────────────────────────────
    unitRegistry.markCoding(pid, unitId);
    const coderHistorySummary = _buildRetryContext(history);
    const coderPrompt = attempt === 1
      ? `Mode: implement\nUnit: ${unitId}\n\nRead units/${unitId}/spec.json and produce code/ + contract.json + coder.log.`
      : `Mode: retry (attempt ${attempt})\nUnit: ${unitId}\n\n${coderHistorySummary}\n\nReflect on the failure and patch code/ minimally; append a new coder.log entry with last_failure/last_cause/this_fix/rationale fields.`;
    const coderResult = await callAgent(pid, 'devloop-coder', coderPrompt, {
      mock: opts.mock !== false,
      onChunk: opts.onChunk ? (t) => opts.onChunk('devloop-coder', t) : undefined,
    });
    history.push({
      agent: 'devloop-coder', attempt,
      files: coderResult.files_written,
      summary: coderResult.result_text,
      commit: coderResult.commit?.sha,
    });

    // ── testing ──────────────────────────────────────────────
    unitRegistry.markTesting(pid, unitId);
    const testerPrompt = `Mode: ${attempt === 1 ? 'test' : 'retry'}\nUnit: ${unitId}\n\nRead units/${unitId}/code/ + spec.json, run vitest, parse the JSON reporter, and write runs/{runId}/result.json.`;
    const testerResult = await callAgent(pid, 'devloop-tester', testerPrompt, {
      mock: opts.mock !== false,
      onChunk: opts.onChunk ? (t) => opts.onChunk('devloop-tester', t) : undefined,
    });

    const resultRef = _findLatestTesterResult(pid, unitId);
    const testerOk = resultRef ? !!resultRef.parsed?.ok : false;
    history.push({
      agent: 'devloop-tester', attempt,
      files: testerResult.files_written,
      summary: testerResult.result_text,
      commit: testerResult.commit?.sha,
      ok: testerOk,
      failures: resultRef?.parsed?.failures || [],
    });

    // ── transition ──────────────────────────────────────────
    if (testerOk) {
      unitRegistry.pass(pid, unitId, unit.contract_hash);
      finalOk = true;
      break;
    } else {
      const reason = resultRef?.parsed?.failures?.[0]?.test
        || resultRef?.parsed?.failures?.[0]?.hint
        || `tester reported failure (attempt ${attempt})`;
      unitRegistry.fail(pid, unitId, reason);
      // 如果还有预算 → 再循环;否则 markBlocked
      if (attempt >= budget) {
        unitRegistry.block(pid, unitId, `retry_budget_exceeded after ${attempt} attempts`);
        break;
      }
      // 把 unit 从 failed → coding 由下一轮 markCoding 完成 (FSM 允许)
    }
  }

  try {
    timelineLogger.append(pid, {
      source: 'system',
      kind: 'unit.run_complete',
      ref: unitId,
      summary: `Unit ${unitId} ${finalOk ? 'passed' : 'blocked'} after ${attempt} attempt(s)`,
      payload: { ok: finalOk, attempts: attempt, budget },
    });
  } catch { /* swallow */ }

  return {
    ok: finalOk,
    unit_id: unitId,
    attempts: attempt,
    final_state: unitRegistry.get(pid, unitId).status,
    history,
  };
}

/** 把 history 数组压成给 Coder 反思用的 markdown 摘要 */
function _buildRetryContext(history) {
  if (!history.length) return '';
  const lines = ['## Retry History'];
  for (const h of history) {
    lines.push(`- attempt ${h.attempt} · ${h.agent}: ${(h.summary || '').slice(0, 120)}`);
    if (h.agent === 'devloop-tester' && Array.isArray(h.failures) && h.failures.length) {
      for (const f of h.failures.slice(0, 3)) {
        lines.push(`  - failure: ${f.test || f.name || '(unnamed)'}: ${f.hint || f.stack?.slice(0, 80) || ''}`);
      }
    }
  }
  return lines.join('\n');
}

/**
 * 找 units/{unitId}/runs/ 下最新一次 result.json (按字典序 — runId 含日期前缀)。
 */
function _findLatestTesterResult(pid, unitId) {
  const runsDir = path.join(pathResolver.resolveUnitDir(pid, unitId), 'runs');
  if (!fs.existsSync(runsDir)) return null;
  const ids = fs.readdirSync(runsDir).filter(n => fs.statSync(path.join(runsDir, n)).isDirectory());
  if (!ids.length) return null;
  ids.sort();
  const latest = ids[ids.length - 1];
  const resultPath = path.join(runsDir, latest, 'result.json');
  if (!fs.existsSync(resultPath)) return { runId: latest, parsed: null };
  try {
    return { runId: latest, parsed: JSON.parse(fs.readFileSync(resultPath, 'utf8')) };
  } catch {
    return { runId: latest, parsed: null };
  }
}

// ──────────────────────────────────────────────────────────────
// P3 · L2 Integration Loop · runProject
// ──────────────────────────────────────────────────────────────

/**
 * Topological wave grouping (Kahn). Returns string[][] — units per wave.
 */
function _groupUnitsByWave(units) {
  const groups = [];
  const remaining = new Set(units.map(u => u.id));
  const deps = new Map(units.map(u => [u.id, (u.depends_on || []).slice()]));
  while (remaining.size > 0) {
    const wave = [];
    for (const id of remaining) {
      if (deps.get(id).every(d => !remaining.has(d))) wave.push(id);
    }
    if (wave.length === 0) {
      throw new Error('cycle in units.json (no unit has all dependencies cleared)');
    }
    for (const id of wave) remaining.delete(id);
    groups.push(wave);
  }
  return groups;
}

/** find latest run dir under integration/runs/ */
function _findLatestIntegrationRunDir(pid) {
  const dir = path.join(pathResolver.resolveProjectRoot(pid), 'integration', 'runs');
  if (!fs.existsSync(dir)) return null;
  const ids = fs.readdirSync(dir).filter(n => fs.statSync(path.join(dir, n)).isDirectory());
  if (!ids.length) return null;
  ids.sort();
  return ids[ids.length - 1];
}

function _readJsonSafe(p) {
  try { return JSON.parse(fs.readFileSync(p, 'utf8')); } catch { return null; }
}

/**
 * runProject — P3 主循环 (mock 模式)。
 *
 * 流程:
 *   while not done and not blocked:
 *     1. 按 DAG wave 跑 L1 (per-unit runUnit)
 *     2. 若 l2GateOpen → 跑 Integrator
 *     3. result.ok=true → 项目完成
 *     4. result.ok=false → Triager → dispatch:
 *        - contract_mismatch + conf≥0.5 → Architect(patch) + reset affected (架构师自己改 units.json)
 *          → l2_rounds++; 超 l2_budget → l2_exhausted
 *        - impl_bug + conf≥0.5 → reset affected (unit-registry.reset) → 不烧预算
 *        - infra_flake → 直接重跑 (不 reset, 不烧预算)
 *        - spec_ambiguous OR conf<0.5 → l2_blocked + SSE human_intervention_needed
 *
 * @param {string} pid
 * @param {object} opts
 *   - mockFixtureDir?: string   (P3 scenario 测试用)
 *   - maxRetries?: number       (safety net 防 mock 死循环;默认 10)
 * @returns { ok, pid, final_state: 'shipped'|'l2_blocked'|'l2_exhausted', l2_rounds, history }
 */
async function runProject(pid, opts = {}) {
  // 注意: 不 resetMockState — runProject 是 runDocsPhase 的延续,
  // 计数继续往下走才能让 Architect 第二次调用进入 patch 分支 (seq[1])。
  // 调用方若想全新状态,在调 runDocsPhase 前自己 reset。
  const projectRoot = pathResolver.resolveProjectRoot(pid);
  const history = [];
  const callOpts = {
    mock: opts.mock !== false,
    mockFixtureDir: opts.mockFixtureDir,
    resetMockSequence: false, // 一次 runProject 只 reset 一次
  };
  const safety = opts.maxRetries || 10;
  let iterations = 0;

  // SSE start
  sseBroker.emit(pid, 'project.run_started', { pid, ts: Date.now() });

  while (iterations < safety) {
    iterations++;

    // ── (1) L1 wave 调度: 找所有 pending units 按 DAG 分波 ────────
    const allUnits = unitRegistry.list(pid);
    const pendingUnits = allUnits.filter(u => u.status === 'pending');
    if (pendingUnits.length > 0) {
      const waves = _groupUnitsByWave(pendingUnits);
      for (let w = 0; w < waves.length; w++) {
        const wave = waves[w];
        sseBroker.emit(pid, 'l1.wave_start', { wave_index: w, units: wave });
        // 串行跑(mock 同步快,不需并行)
        for (const uid of wave) {
          const r = await runUnit(pid, uid, { ...callOpts });
          history.push({ phase: 'L1', wave: w, unit: uid, ok: r.ok, attempts: r.attempts });
          if (!r.ok) {
            sseBroker.emit(pid, 'project.l1_blocked', { unit: uid, attempts: r.attempts });
            _safeSetStatus(pid, 'l2_blocked', { reason: `unit ${uid} blocked` });
            return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history, reason: `unit ${uid} blocked` };
          }
        }
      }
    }

    // ── (2) L2 gate ────────────────────────────────────────────
    if (!unitRegistry.l2GateOpen(pid)) {
      sseBroker.emit(pid, 'project.l2_blocked', { reason: 'l2GateClosed' });
      _safeSetStatus(pid, 'l2_blocked', { reason: 'l2GateClosed' });
      return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history, reason: 'l2GateClosed' };
    }

    // ── (3) 跑 Integrator ──────────────────────────────────────
    sseBroker.emit(pid, 'integration.run_start', { l2_round: _l2Rounds(pid) });
    const integ = await callAgent(pid, 'devloop-integrator',
      `Mode: ${_l2Rounds(pid) === 0 ? 'run' : 'retry'}\nRun integration tests per integration/spec.json. Spawn be units on free ports, execute cases, write result.json.`,
      callOpts);
    const runId = _findLatestIntegrationRunDir(pid);
    const intResult = runId ? _readJsonSafe(path.join(projectRoot, 'integration/runs', runId, 'result.json')) : null;
    history.push({ phase: 'L2.integrate', l2_round: _l2Rounds(pid), run_id: runId, ok: intResult?.ok, crashed: intResult?.crashed });
    sseBroker.emit(pid, 'integration.result', { run_id: runId, ok: !!intResult?.ok, crashed: !!intResult?.crashed });

    // ── (4) 成功 → 项目完成 ────────────────────────────────────
    if (intResult?.ok === true) {
      // 若有未关 bug → 转 fixed
      const openBugs = bugTracker.list(pid, { status: ['open', 'fixing'] });
      for (const b of openBugs) {
        try { bugTracker.transition(pid, b.id, { to: 'fixed', by: 'devloop-integrator', note: 'integration passed' }); }
        catch { /* skip invalid transitions */ }
      }
      sseBroker.emit(pid, 'project.shipped', { l2_rounds: _l2Rounds(pid), run_id: runId });
      try {
        timelineLogger.append(pid, {
          source: 'system', kind: 'project.shipped', ref: runId,
          summary: `Project shipped after ${_l2Rounds(pid)} L2 round(s)`,
        });
      } catch {}
      _setProjectStatus(pid, 'shipped', { run_id: runId });
      return { ok: true, pid, final_state: 'shipped', l2_rounds: _l2Rounds(pid), history, run_id: runId };
    }

    // ── (5) 失败 → 开 bug + 调 Triager ──────────────────────────
    const bug = bugTracker.open(pid, {
      source: 'integration_test',
      run_id: runId,
      title: `integration ${runId} failed${intResult?.crashed ? ' (crashed)' : ''}`,
      severity: intResult?.crashed ? 'high' : 'medium',
      category: 'unknown',
      detail: (intResult?.failures?.[0]?.stderr_excerpt || intResult?.crash_reason || 'unknown').slice(0, 200),
      affected_units: intResult?.failures?.[0]?.involves || [],
      by: 'devloop-integrator',
    });
    bugTracker.transition(pid, bug.id, { to: 'fixing', by: 'devloop-triager', note: 'triage in progress' });

    await callAgent(pid, 'devloop-triager',
      `Mode: triage\nrun_id: ${runId}\nAnalyze integration/runs/${runId}/result.json + process.log; write triage.json.`,
      callOpts);
    const triage = runId ? _readJsonSafe(path.join(projectRoot, 'integration/runs', runId, 'triage.json')) : null;
    history.push({ phase: 'L2.triage', l2_round: _l2Rounds(pid), run_id: runId, category: triage?.category, confidence: triage?.confidence });
    sseBroker.emit(pid, 'triage.result', {
      run_id: runId,
      category: triage?.category,
      confidence: triage?.confidence,
      affected_units: triage?.affected_units || [],
    });

    if (!triage) {
      sseBroker.emit(pid, 'human_intervention_needed', { reason: 'triage_missing', run_id: runId });
      _safeSetStatus(pid, 'l2_blocked', { reason: 'triage_missing' });
      return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history, reason: 'no triage produced' };
    }

    // ── (6) 分支调度 ────────────────────────────────────────────
    const lowConfidence = (triage.confidence ?? 0) < 0.5;
    const category = triage.category;

    if (lowConfidence || category === 'spec_ambiguous') {
      sseBroker.emit(pid, 'human_intervention_needed', {
        reason: lowConfidence ? 'low_confidence_triage' : 'spec_ambiguous',
        run_id: runId, category, confidence: triage.confidence,
      });
      _safeSetStatus(pid, 'l2_blocked', { reason: lowConfidence ? 'low_confidence' : 'spec_ambiguous' });
      return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history, reason: `triage ${category} confidence=${triage.confidence}` };
    }

    if (category === 'infra_flake') {
      // 不 reset 不烧预算,直接下一轮重跑 Integrator
      history.push({ phase: 'L2.dispatch', action: 'rerun_integrator (infra_flake)' });
      continue;
    }

    if (category === 'impl_bug') {
      // reset affected units (不烧 l2_budget)
      const affected = (triage.affected_units || []).filter(u => allUnits.find(x => x.id === u));
      if (affected.length === 0) {
        sseBroker.emit(pid, 'human_intervention_needed', { reason: 'impl_bug_no_affected', run_id: runId });
        _safeSetStatus(pid, 'l2_blocked', { reason: 'impl_bug_no_affected' });
        return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history };
      }
      unitRegistry.reset(pid, affected);
      history.push({ phase: 'L2.dispatch', action: 'reset_units (impl_bug)', units: affected });
      sseBroker.emit(pid, 'units.reset', { units: affected, cause: 'impl_bug' });
      continue;
    }

    if (category === 'contract_mismatch') {
      // 调 Architect patch (fixture 自己写 units.json,会把 affected_units 标 pending + l2_rounds++)
      // 预检 l2_budget
      const currentRounds = _l2Rounds(pid);
      const l2Budget = _l2Budget(pid);
      if (currentRounds + 1 > l2Budget) {
        sseBroker.emit(pid, 'project.l2_exhausted', { l2_rounds: currentRounds, l2_budget: l2Budget });
        _safeSetStatus(pid, 'l2_exhausted', { reason: 'budget_exceeded' });
        return { ok: false, pid, final_state: 'l2_exhausted', l2_rounds: currentRounds, history };
      }
      const oldSddRev = _readSddRev(pid);
      await callAgent(pid, 'devloop-architect',
        `Mode: patch\nrun_id: ${runId}\nApply triage.proposed_sdd_patch; bump units.json contract_hash for affected units; increment l2_rounds.`,
        callOpts);
      const newSddRev = _readSddRev(pid);
      if (newSddRev > oldSddRev) {
        try {
          changelogWriter.append(pid, {
            kind: 'sdd_rev',
            rev: newSddRev,
            by: 'devloop-architect',
            trigger: 'l2_triage',
            summary: `SDD patched from rev ${oldSddRev} to ${newSddRev} per triage ${category}`,
            diff: { changed_sections: [triage.proposed_sdd_patch?.target_section || '(unknown)'] },
          });
        } catch { /* swallow */ }
        sseBroker.emit(pid, 'sdd.updated', { rev: newSddRev, summary: `patch applied (round ${_l2Rounds(pid)})` });
      }
      history.push({ phase: 'L2.dispatch', action: 'sdd_patch + reset', sdd_rev: newSddRev });
      continue;
    }

    // Unknown category
    sseBroker.emit(pid, 'human_intervention_needed', { reason: 'unknown_category', category });
    _safeSetStatus(pid, 'l2_blocked', { reason: 'unknown_category' });
    return { ok: false, pid, final_state: 'l2_blocked', l2_rounds: _l2Rounds(pid), history, reason: `unknown category: ${category}` };
  }

  // safety net 超过
  sseBroker.emit(pid, 'project.l2_exhausted', { reason: 'safety_net_iterations', iterations });
  _safeSetStatus(pid, 'l2_exhausted', { reason: 'safety_net' });
  return { ok: false, pid, final_state: 'l2_exhausted', l2_rounds: _l2Rounds(pid), history };
}

/** Status set that swallows invalid-transition errors (already in target state etc.) */
function _safeSetStatus(pid, to, extra) {
  try { return _setProjectStatus(pid, to, extra); }
  catch (e) {
    if (e.name === 'InvalidProjectStatusTransition') return null;
    throw e;
  }
}

function _l2Rounds(pid) {
  const u = docStore.readUnits(pid);
  return u?.l2_rounds || 0;
}
function _l2Budget(pid) {
  const u = docStore.readUnits(pid);
  return u?.l2_budget || 3;
}
function _readSddRev(pid) {
  const root = pathResolver.resolveProjectRoot(pid);
  const idx = path.join(root, 'sdd', 'index.html');
  if (!fs.existsSync(idx)) return 0;
  const m = fs.readFileSync(idx, 'utf8').match(/<article[^>]*data-doc="sdd"[^>]*data-rev="(\d+)"/);
  if (m) return parseInt(m[1], 10);
  // fallback: try mvcp/control.html (where patch goes)
  const ctrl = path.join(root, 'sdd', 'mvcp', 'control.html');
  if (fs.existsSync(ctrl)) {
    const m2 = fs.readFileSync(ctrl, 'utf8').match(/<article[^>]*data-doc="sdd"[^>]*data-rev="(\d+)"/);
    if (m2) return parseInt(m2[1], 10);
  }
  return 1;
}

// ──────────────────────────────────────────────────────────────
// P4 · L3 Human Feedback · status FSM + signOff / abandon / feedback
// ──────────────────────────────────────────────────────────────

const STATUS_TRANSITIONS = {
  draft: ['running', 'abandoned'],
  running: ['shipped', 'l2_blocked', 'l2_exhausted', 'abandoned'],
  l2_blocked: ['running', 'abandoned'],
  l2_exhausted: ['running', 'abandoned'],
  shipped: ['running', 'shipped-final', 'abandoned'],
  'shipped-final': [],          // 终态
  abandoned: [],                // 终态
};

class InvalidProjectStatusTransition extends Error {
  constructor(from, to) {
    super(`Invalid project status transition: ${from} → ${to}`);
    this.name = 'InvalidProjectStatusTransition';
    this.from = from;
    this.to = to;
  }
}

function _readProjectMeta(pid) {
  const p = pathResolver.resolveProjectJson(pid);
  if (!fs.existsSync(p)) throw new Error(`project.json missing for ${pid}`);
  return JSON.parse(fs.readFileSync(p, 'utf8'));
}

function _writeProjectMeta(pid, meta) {
  fs.writeFileSync(pathResolver.resolveProjectJson(pid), JSON.stringify(meta, null, 2));
}

/**
 * 改 project.json.status,做 FSM 校验 + 发 SSE + 写 timeline。
 * 非法转换抛 InvalidProjectStatusTransition (供路由层映射 400)。
 */
function _setProjectStatus(pid, to, extra = {}) {
  const meta = _readProjectMeta(pid);
  const from = meta.status || 'draft';
  if (from === to) return meta; // idempotent
  const allowed = STATUS_TRANSITIONS[from] || [];
  if (!allowed.includes(to)) {
    throw new InvalidProjectStatusTransition(from, to);
  }
  meta.status = to;
  meta.status_updated_at = new Date().toISOString();
  if (extra.note) meta.status_note = extra.note;
  _writeProjectMeta(pid, meta);

  try {
    sseBroker.emit(pid, 'project.status', { from, to, ...extra });
    timelineLogger.append(pid, {
      source: extra.by || 'system',
      kind: 'project.status',
      ref: pid,
      summary: `Project status ${from} → ${to}${extra.reason ? ` (${extra.reason})` : ''}`,
      payload: { from, to, ...extra },
    });
  } catch { /* swallow */ }
  return meta;
}

/**
 * Sign Off — 把已 shipped 的项目锁为 shipped-final。
 * 之后再发 feedback 会被拒绝。
 */
async function signOff(pid, opts = {}) {
  const meta = _readProjectMeta(pid);
  if (meta.status !== 'shipped') {
    throw new InvalidProjectStatusTransition(meta.status || 'unknown', 'shipped-final');
  }
  _setProjectStatus(pid, 'shipped-final', { by: opts.by || 'human', note: opts.note || 'signed off' });
  // sign-off commit (留 git 痕)
  try {
    await gitVault.commit(pid, {
      kind: 'chore',
      summary: `chore: sign-off project ${pid}`,
      author: { name: opts.by || 'human', email: 'human@devloop.local' },
    });
  } catch { /* swallow if nothing to commit */ }
  return _readProjectMeta(pid);
}

/**
 * Abandon — 任意状态 → abandoned。发 SSE close 帧关闭所有订阅。
 */
async function abandon(pid, opts = {}) {
  const meta = _readProjectMeta(pid);
  if (meta.status === 'shipped-final' || meta.status === 'abandoned') {
    throw new InvalidProjectStatusTransition(meta.status, 'abandoned');
  }
  _setProjectStatus(pid, 'abandoned', { by: opts.by || 'human', reason: opts.reason || 'manual abandon', note: opts.note });
  try {
    await gitVault.commit(pid, {
      kind: 'chore',
      summary: `chore: abandon project ${pid}${opts.reason ? ' · ' + opts.reason : ''}`,
      author: { name: opts.by || 'human', email: 'human@devloop.local' },
    });
  } catch { /* swallow */ }
  // 关闭所有 SSE 订阅(close 帧)
  try { sseBroker.close(pid); } catch { /* ignore */ }
  return _readProjectMeta(pid);
}

/**
 * Submit human feedback — 触发 PM incremental 模式。
 * 仅当 status ∈ {shipped, running, l2_blocked, l2_exhausted} 时允许。
 * shipped-final / abandoned → 拒绝。
 */
async function submitFeedback(pid, text, opts = {}) {
  if (!text || typeof text !== 'string') {
    throw new Error('feedback text required');
  }
  const meta = _readProjectMeta(pid);
  if (meta.status === 'shipped-final' || meta.status === 'abandoned') {
    throw new InvalidProjectStatusTransition(meta.status, 'feedback');
  }

  const prdRevBefore = _readPrdRev(pid);
  const pm = await callAgent(pid, 'devloop-pm',
    `Mode: incremental\nFeedback from human (${opts.by || 'user'}):\n${text}\n\nAppend a new section under prd/feature/feature-tree.html (or appropriate chapter), bump prd_rev.`,
    { mock: opts.mock !== false, mockFixtureDir: opts.mockFixtureDir },
  );
  const prdRevAfter = _readPrdRev(pid);

  // 若 PRD rev bumped → 写 changelog
  if (prdRevAfter > prdRevBefore) {
    try {
      changelogWriter.append(pid, {
        kind: 'prd_rev',
        rev: prdRevAfter,
        by: opts.by || 'human',
        trigger: 'human_feedback',
        summary: `PRD bumped to rev ${prdRevAfter} via human feedback`,
        diff: { feedback_excerpt: text.slice(0, 120) },
      });
      sseBroker.emit(pid, 'prd.updated', { rev: prdRevAfter, summary: 'human feedback applied' });
    } catch { /* swallow */ }
  }

  // 若当前是 shipped, 改回 running (人类反馈触发新一轮)
  if (meta.status === 'shipped') {
    _setProjectStatus(pid, 'running', { reason: 'human_feedback' });
  }

  return {
    ok: true,
    pid,
    files_written: pm.files_written,
    prd_rev_before: prdRevBefore,
    prd_rev_after: prdRevAfter,
    status: _readProjectMeta(pid).status,
  };
}

function _readPrdRev(pid) {
  const root = pathResolver.resolveProjectRoot(pid);
  const idx = path.join(root, 'prd', 'index.html');
  if (!fs.existsSync(idx)) return 0;
  const m = fs.readFileSync(idx, 'utf8').match(/<article[^>]*data-doc="prd"[^>]*data-rev="(\d+)"/);
  return m ? parseInt(m[1], 10) : 1;
}

module.exports = {
  createProject,
  commitAfterAgent,
  callAgent,
  runDocsPhase,
  runUnit,
  runProject,
  getProjectState,
  // P4
  signOff,
  abandon,
  submitFeedback,
  InvalidProjectStatusTransition,
};