/**
 * 光湖Agent引擎 · 知识库对话服务
 * BS-SG-001 · 铸渊 ICE-GL-ZY001 · D135b
 *
 * 连接: 代码仓库 ↔ Outline知识库 ↔ 冰朔对话
 *
 * 功能:
 *   /api/chat → 对话查询（读代码仓库·Outline·数据库）
 *   /api/health → 健康检查
 *   /api/agent-status → 查看五分身流水线状态
 */

const express = require('express');
const cors = require('cors');
const { execSync } = require('child_process');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = process.env.PORT || 3095;

app.use(express.json());
app.use(cors());

const REPO_ROOT = '/opt/zhuyuan/guanghulab';
const OUTLINE_URL = process.env.OUTLINE_URL || 'http://127.0.0.1:3090';

// ============ 知识库导航 ============

function scanRepo() {
  const dataDir = path.join(REPO_ROOT, 'video-ai-system/data');
  const brainDir = path.join(REPO_ROOT, 'brain/fifth-domain/zero-point/zhuyuan/causal-chains');
  
  const result = { projects: [], chains: [], agents: [] };
  
  // Scan video AI data
  try {
    const files = fs.readdirSync(dataDir);
    for (const f of files) {
      if (f.endsWith('.json') && f.startsWith('ep')) {
        result.projects.push({ file: f, type: 'output' });
      }
    }
  } catch(e) {}
  
  // Scan causal chains
  try {
    const chains = fs.readdirSync(brainDir);
    for (const c of chains) {
      if (c.endsWith('.hdlp')) {
        result.chains.push({ file: c });
      }
    }
  } catch(e) {}
  
  // Scan agent configs
  try {
    const agentDir = path.join(REPO_ROOT, 'video-ai-system/config/agents');
    const agents = fs.readdirSync(agentDir);
    for (const a of agents) {
      result.agents.push({ file: a });
    }
  } catch(e) {}
  
  return result;
}

function getPipelineStatus() {
  const dataDir = path.join(REPO_ROOT, 'video-ai-system/data');
  const status = {
    episode1: { agents: {} },
  };
  
  const fileStatus = {
    'ep01-scenes.json': 'Agent_01 · 拆文',
    'ep01-storyboard.json': 'Agent_03 · 分镜',
    'ep01-prompts.json': 'Agent_04 · 提示词',
    'ep01-audit.json': 'Agent_05 · 审核',
  };
  
  for (const [file, agent] of Object.entries(fileStatus)) {
    const filePath = path.join(dataDir, file);
    status.episode1.agents[agent] = fs.existsSync(filePath) ? '✅ 完成' : '⏳ 待执行';
  }
  
  // Check characters.hdlp for Agent_02
  const charPath = path.join(REPO_ROOT, 'video-ai-system/data/characters.hdlp');
  status.episode1.agents['Agent_02 · 编号'] = fs.existsSync(charPath) ? '✅ 完成' : '⏳';
  
  return status;
}

// ============ 简单意图路由 ============

function routeIntent(message) {
  const lower = message.toLowerCase();
  
  // Pipeline status
  if (/进度|状态|流水线|第几集|做到哪/.test(message)) {
    return getPipelineStatus();
  }
  
  // Character query
  if (/人物|角色|CHAR|苏白|诸葛风|萧灵汐/.test(message)) {
    try {
      const chars = fs.readFileSync(
        path.join(REPO_ROOT, 'video-ai-system/data/characters.hdlp'), 'utf8');
      return { type: 'characters', content: chars.substring(0, 3000) };
    } catch(e) { return { error: '读取人物库失败' }; }
  }
  
  // Framework query
  if (/框架|规则|agent|分身|硬骨架/.test(message)) {
    try {
      const framework = fs.readFileSync(
        path.join(REPO_ROOT, 'video-ai-system/config/PROJECT-FRAMEWORK.hdlp'), 'utf8');
      return { type: 'framework', content: framework.substring(0, 3000) };
    } catch(e) { return { error: '读取框架失败' }; }
  }
  
  // Navigation
  if (/有什么|导航|目录|结构/.test(message)) {
    return { type: 'navigation', content: scanRepo() };
  }
  
  // Fallback
  return {
    type: 'help',
    content: '铸渊Agent引擎在线。你可以问我：\n• 流水线进度\n• 人物档案\n• 框架规则\n• 项目导航',
    navigation: scanRepo()
  };
}

// ============ API ============

app.post('/api/chat', (req, res) => {
  const { message } = req.body;
  if (!message) return res.status(400).json({ error: '需要消息' });
  
  const response = routeIntent(message);
  res.json({
    reply: typeof response.content === 'string' ? response.content : JSON.stringify(response, null, 2),
    structured: response
  });
});

app.get('/api/health', (req, res) => {
  res.json({
    ok: true,
    service: 'zhuyuan-agent-engine',
    version: 'v1.0',
    repo: fs.existsSync(REPO_ROOT) ? 'connected' : 'missing',
    outline: OUTLINE_URL
  });
});

app.get('/api/agent-status', (req, res) => {
  res.json(getPipelineStatus());
});

// ============ 注册系统 ============

const bcrypt = require('bcryptjs');
const { execSync: dexExecSync } = require('child_process');
const DEX_DB_HOST = '/opt/outline/dex-data/dex.db';

app.post('/api/register', (req, res) => {
  const { username, email, password } = req.body;
  
  if (!username || username.length < 2) return res.status(400).json({ ok: false, error: '用户名至少2个字符' });
  if (!email || !email.includes('@')) return res.status(400).json({ ok: false, error: '无效邮箱' });
  if (!password || password.length < 8) return res.status(400).json({ ok: false, error: '密码至少8位' });
  
  try {
    // Hash password
    const hash = bcrypt.hashSync(password, 10);
    const userId = 'user-' + Date.now().toString(36) + '-' + Math.random().toString(36).substring(2, 8);
    
    // Use Python3 + sqlite3 to write to Dex database
    // Steps: 1) docker cp db out, 2) python modify, 3) docker cp back, 4) restart dex
    const safeEmail = email.replace(/'/g, "''");
    const safeHash = hash.replace(/'/g, "''");
    const safeUser = username.replace(/'/g, "''");
    
    const script = `
import sqlite3, sys
db = sqlite3.connect('${DEX_DB_HOST}')
try:
    db.execute("CREATE TABLE IF NOT EXISTS password (email TEXT PRIMARY KEY, hash TEXT, username TEXT, user_id TEXT)")
    existing = db.execute("SELECT email FROM password WHERE email=?", ('${safeEmail}',)).fetchone()
    if existing:
        print('EXISTS')
        sys.exit(1)
    db.execute("INSERT INTO password (email, hash, username, user_id) VALUES (?,?,?,?)", 
               ('${safeEmail}', '${safeHash}', '${safeUser}', '${userId}'))
    db.commit()
    print('OK')
finally:
    db.close()
`;
    dexExecSync(`docker cp outline-dex:/tmp/dex.db ${DEX_DB_HOST} 2>/dev/null || true`);
    const result = dexExecSync(`python3 -c "${script.replace(/"/g, '\\"').replace(/\n/g, '\\n')}"`, 
      { timeout: 5000, encoding: 'utf8' }).trim();
    
    if (result === 'EXISTS') {
      return res.status(400).json({ ok: false, error: '该邮箱已注册' });
    }
    if (result !== 'OK') {
      throw new Error('Python script failed: ' + result);
    }
    
    dexExecSync(`docker cp ${DEX_DB_HOST} outline-dex:/tmp/dex.db`);
    dexExecSync('docker restart outline-dex 2>/dev/null');
    
    console.log(`[注册] 新用户: ${username} <${email}>`);
    res.json({ ok: true, message: '注册成功', userId });
  } catch(e) {
    console.error('[注册失败]', e.message);
    res.status(500).json({ ok: false, error: '服务器错误：' + e.message });
  }
});

app.listen(PORT, '127.0.0.1', () => {
  console.log(`[Agent引擎] 启动 · 端口${PORT} · 仓库${REPO_ROOT}`);
});