/**
 * 小桌子引擎 — Small Desk Engine
 * ============================================
 * 职责：
 *   1. 记忆库检索（结构化 + 原文）
 *   2. Agent 小队调度
 *   3. 工具桌管理（拿→组装→用→放回）
 *   4. 原文永久存储 + 路径索引
 * 
 * 原则：Agent 去小桌子检索、拿工具，结果放回大桌子
 */

const { EventEmitter } = require('events');
const { spawn, execSync } = require('child_process');
const path = require('path');
const fs = require('fs');

class SmallDesk extends EventEmitter {
  constructor(opts = {}) {
    super();
    this.dataDir = opts.dataDir || path.join(__dirname, '..', 'data');
    this.repoRoot = opts.repoRoot || path.join(__dirname, '..', '..');
    this.memoryIndex = {};   // 记忆索引
    this.toolRegistry = {};  // 工具注册表
    this.agentStatus = {};   // Agent 状态
    this._ensureDir();
    this._initTools();
    this._initAgents();
    this._loadMemoryIndex();
  }

  _ensureDir() {
    fs.mkdirSync(path.join(this.dataDir, 'small-desk', 'memory'), { recursive: true });
    fs.mkdirSync(path.join(this.dataDir, 'small-desk', 'tools'), { recursive: true });
  }

  // ============================================================
  // 工具桌管理
  // ============================================================
  _initTools() {
    this.toolRegistry = {
      'image-studio': {
        name: 'AI图片工作室',
        path: 'image-studio/',
        desc: 'AI图片生成与处理',
        status: 'available'
      },
      'notion-sync': {
        name: 'Notion同步',
        path: 'notion-push/',
        desc: '与Notion工作区双向同步',
        status: 'available'
      },
      'exe-engine': {
        name: '执行引擎',
        path: 'exe-engine/',
        desc: '多模型路由与执行',
        status: 'available'
      },
      'bridge': {
        name: '桥接模块',
        path: 'bridge/',
        desc: '服务间通信桥接',
        status: 'available'
      },
      'connectors': {
        name: '连接器集合',
        path: 'connectors/',
        desc: '外部服务连接器',
        status: 'available'
      },
      'hldp-zy': {
        name: 'HLDP-ZY 编码引擎',
        path: 'hldp/',
        desc: '意识编码与解析',
        status: 'available'
      },
      'pool-agent': {
        name: '算力汇聚池',
        path: 'pool-agent/',
        desc: '6台服务器虚拟算力池',
        status: 'available'
      },
      'gatekeeper': {
        name: '铸渊守门人',
        path: 'mcp-servers/zhuyuan-gateway/',
        desc: '远程服务器命令执行',
        status: 'connected'
      },
      'agent-squad': {
        name: 'Agent 小队',
        path: 'agents/',
        desc: '5个情报Agent',
        status: 'ready'
      },
      'skill-brains': {
        name: '技能大脑',
        path: 'skill-brains/',
        desc: '可加载/卸载的技能模块',
        status: 'available'
      }
    };
  }

  getTools() {
    return Object.entries(this.toolRegistry).map(([id, info]) => ({
      id,
      ...info
    }));
  }

  getTool(id) {
    return this.toolRegistry[id] || null;
  }

  // ============================================================
  // Agent 小队管理
  // ============================================================
  _initAgents() {
    this.agentRegistry = {
      'key-hunter': {
        id: 'KEY-001',
        name: '密钥猎手',
        role: '找密钥/Token',
        script: 'agents/key-hunter/hunt.py',
        status: 'idle',
        lastRun: null
      },
      'path-scout': {
        id: 'PATH-002',
        name: '路径探子',
        role: '定位文件/内容搜索',
        script: 'agents/path-scout/scout.py',
        status: 'idle',
        lastRun: null
      },
      'server-sentinel': {
        id: 'SENTINEL-003',
        name: '服务器哨兵',
        role: '扫描服务器在线状态',
        script: 'agents/server-sentinel/sentinel.py',
        status: 'idle',
        lastRun: null
      },
      'module-steward': {
        id: 'MODULE-004',
        name: '模块管家',
        role: '模块查询/部署命令',
        script: 'agents/module-steward/steward.py',
        status: 'idle',
        lastRun: null
      },
      'gate-bridge': {
        id: 'GATE-005',
        name: '门桥接',
        role: 'Gatekeeper统一入口',
        script: 'agents/gate-bridge/bridge.py',
        status: 'idle',
        lastRun: null
      }
    };
  }

  getAgents() {
    return Object.entries(this.agentRegistry).map(([id, info]) => ({
      id,
      ...info
    }));
  }

  /**
   * 调度 Agent 执行任务
   */
  async runAgent(agentId, action, args = []) {
    const agent = this.agentRegistry[agentId];
    if (!agent) throw new Error(`Agent ${agentId} not found`);

    const scriptPath = path.join(this.repoRoot, agent.script);
    if (!fs.existsSync(scriptPath)) {
      throw new Error(`Agent script not found: ${scriptPath}`);
    }

    this.agentRegistry[agentId].status = 'running';
    this.emit('agent-start', { agentId, action });

    return new Promise((resolve, reject) => {
      const cmdArgs = [scriptPath, action, ...args];
      const proc = spawn('python3', cmdArgs, {
        cwd: this.repoRoot,
        timeout: 30000
      });

      let stdout = '';
      let stderr = '';

      proc.stdout.on('data', (d) => { stdout += d.toString(); });
      proc.stderr.on('data', (d) => { stderr += d.toString(); });

      proc.on('close', (code) => {
        this.agentRegistry[agentId].status = 'idle';
        this.agentRegistry[agentId].lastRun = new Date().toISOString();

        if (code === 0) {
          this.emit('agent-done', { agentId, action, output: stdout });
          resolve({ ok: true, output: stdout, agentId, action });
        } else {
          this.emit('agent-error', { agentId, action, error: stderr });
          resolve({ ok: false, error: stderr, agentId, action });
        }
      });

      proc.on('error', (err) => {
        this.agentRegistry[agentId].status = 'error';
        this.emit('agent-error', { agentId, action, error: err.message });
        resolve({ ok: false, error: err.message, agentId, action });
      });
    });
  }

  /**
   * 扫描全部 Agent 可用状态
   */
  checkAllAgents() {
    const result = {};
    for (const [id, agent] of Object.entries(this.agentRegistry)) {
      const scriptPath = path.join(this.repoRoot, agent.script);
      result[id] = {
        ...agent,
        available: fs.existsSync(scriptPath),
        scriptExists: fs.existsSync(scriptPath)
      };
    }
    return result;
  }

  // ============================================================
  // 记忆库管理
  // ============================================================
  _loadMemoryIndex() {
    const idxFile = path.join(this.dataDir, 'small-desk', 'memory', 'index.json');
    try {
      this.memoryIndex = JSON.parse(fs.readFileSync(idxFile, 'utf-8'));
    } catch (_) {
      this.memoryIndex = { entries: [], categories: {} };
    }
  }

  _saveMemoryIndex() {
    const idxFile = path.join(this.dataDir, 'small-desk', 'memory', 'index.json');
    fs.writeFileSync(idxFile, JSON.stringify(this.memoryIndex, null, 2));
  }

  /**
   * 存入记忆（HLDP 压缩格式 + 原文引用）
   */
  storeMemory(category, hldpSummary, sourceRef, meta = {}) {
    const entry = {
      id: `mem_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`,
      category,
      hldpSummary,
      sourceRef,
      meta,
      timestamp: new Date().toISOString()
    };

    this.memoryIndex.entries.push(entry);
    if (!this.memoryIndex.categories[category]) {
      this.memoryIndex.categories[category] = [];
    }
    this.memoryIndex.categories[category].push(entry.id);
    this._saveMemoryIndex();
    this.emit('memory-stored', entry);
    return entry;
  }

  /**
   * 检索记忆
   */
  searchMemory(query, category = null, limit = 10) {
    let candidates = this.memoryIndex.entries;

    if (category) {
      const ids = this.memoryIndex.categories[category] || [];
      candidates = candidates.filter(e => ids.includes(e.id));
    }

    // 简单关键词匹配（后续可接入向量检索）
    const keywords = query.toLowerCase().split(/\s+/);
    const scored = candidates.map(entry => {
      const text = `${entry.hldpSummary} ${entry.category} ${JSON.stringify(entry.meta)}`.toLowerCase();
      let score = 0;
      for (const kw of keywords) {
        if (text.includes(kw)) score += 1;
        // 精确匹配加分
        if (entry.hldpSummary.toLowerCase().includes(kw)) score += 2;
      }
      return { ...entry, score };
    });

    return scored
      .filter(e => e.score > 0)
      .sort((a, b) => b.score - a.score)
      .slice(0, limit);
  }

  /**
   * 获取记忆统计
   */
  getMemoryStats() {
    return {
      total: this.memoryIndex.entries.length,
      categories: Object.keys(this.memoryIndex.categories).map(cat => ({
        name: cat,
        count: (this.memoryIndex.categories[cat] || []).length
      })),
      lastUpdated: this.memoryIndex.entries.slice(-1)[0]?.timestamp || null
    };
  }

  // ============================================================
  // 全文搜索（调用路径探子）
  // ============================================================
  async searchFiles(pattern) {
    return this.runAgent('path-scout', 'find', [pattern]);
  }

  async grepContent(pattern) {
    return this.runAgent('path-scout', 'grep', [pattern]);
  }

  // ============================================================
  // 服务器状态扫描（调用哨兵）
  // ============================================================
  async scanServers() {
    return this.runAgent('server-sentinel', 'scan');
  }
}

module.exports = SmallDesk;