#!/usr/bin/env bun
/**
 * AI Assistant Standalone Server
 *
 * 包含嵌入式 Web UI 的独立服务器
 * 由 scripts/build-standalone.ts 构建
 */

import { Hono } from 'hono';
import { cors } from 'hono/cors';
import { logger } from 'hono/logger';
import { createBunWebSocket } from 'hono/bun';

import {
  sessionsRouter,
  toolsRouter,
  configRouter,
  filesRouter,
  commandsRouter,
  mcpRouter,
  hooksRouter,
  agentsRouter,
  checkpointsRouter,
  providersRouter,
  servicesRouter,
  contextRouter,
  lspRouter,
  systemCommandsRouter,
  statsRouter,
} from '../routes/index.js';
import {
  handleWebSocket,
  handleWebSocketMessage,
  handleWebSocketClose,
  getConnectionStats,
} from '../ws.js';
import { handleSSE, getSSEStats } from '../sse.js';
import { getSessionManager } from '../session/manager.js';
import { initCore, isCoreAvailable } from '../agent/index.js';
import {
  authMiddleware,
  initAuth,
  getAuthConfig,
  generateToken,
  addToken,
} from '../auth/index.js';

// 嵌入的 Web 资源（构建时生成）
import { EMBEDDED_ASSETS, decodeAsset } from '../embedded-assets.generated.js';
// 嵌入的 WASM 文件（构建时生成）
import { EMBEDDED_WASM } from '../embedded-wasm.generated.js';

// 创建 Hono 应用
const app = new Hono();

// WebSocket 升级
const { upgradeWebSocket, websocket } = createBunWebSocket();

// 中间件
app.use('*', logger());
app.use(
  '*',
  cors({
    origin: '*',
    allowMethods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
    allowHeaders: ['Content-Type', 'Authorization'],
  })
);

// 认证中间件
app.use('*', authMiddleware);

// 健康检查
app.get('/health', (c) => {
  const sessionManager = getSessionManager();
  const wsStats = getConnectionStats();
  const sseStats = getSSEStats();
  const authConfig = getAuthConfig();

  return c.json({
    status: 'ok',
    timestamp: new Date().toISOString(),
    agent: {
      coreAvailable: isCoreAvailable(),
    },
    auth: {
      enabled: authConfig.enabled,
      tokenCount: authConfig.tokens.length,
    },
    stats: {
      sessions: sessionManager.count(),
      websocket: wsStats,
      sse: sseStats,
    },
  });
});

// API 路由
const api = new Hono();
api.route('/sessions', sessionsRouter);
api.route('/tools', toolsRouter);
api.route('/config', configRouter);
api.route('/files', filesRouter);
api.route('/commands', commandsRouter);
api.route('/mcp', mcpRouter);
api.route('/hooks', hooksRouter);
api.route('/agents', agentsRouter);
api.route('/checkpoints', checkpointsRouter);
api.route('/providers', providersRouter);
api.route('/services', servicesRouter);
api.route('/lsp', lspRouter);
api.route('/system-commands', systemCommandsRouter);
api.route('/stats', statsRouter);
api.route('/', contextRouter);

// SSE 事件流
api.get('/sessions/:id/events', handleSSE);

// WebSocket 端点
api.get(
  '/ws/:sessionId',
  upgradeWebSocket((c) => {
    const sessionId = c.req.param('sessionId');
    return {
      onOpen(_event, ws) {
        handleWebSocket(ws, sessionId);
      },
      onMessage(event, ws) {
        handleWebSocketMessage(ws, sessionId, event.data);
      },
      onClose(_event, ws) {
        handleWebSocketClose(ws, sessionId);
      },
      onError(event, ws) {
        console.error('[WS] Error:', event);
        handleWebSocketClose(ws, sessionId);
      },
    };
  })
);

app.route('/api', api);

// 嵌入式 Web UI 静态文件服务
app.get('*', (c) => {
  let reqPath = c.req.path;

  // 尝试查找精确匹配
  let asset = EMBEDDED_ASSETS.get(reqPath);

  // 如果没找到且不是文件路径，尝试 index.html (SPA 路由)
  if (!asset && !reqPath.includes('.')) {
    asset = EMBEDDED_ASSETS.get('/index.html');
  }

  if (asset) {
    const body = decodeAsset(asset);
    return new Response(body, {
      headers: {
        'Content-Type': asset.mimeType,
        'Cache-Control': reqPath.includes('/assets/') ? 'public, max-age=31536000' : 'no-cache',
      },
    });
  }

  return c.json({ success: false, error: 'Not found' }, 404);
});

// 解析命令行参数
function parseArgs(): { port: number; host: string; auth?: boolean; token?: string } {
  const args = process.argv.slice(2);
  let port = 3000;
  let host = '127.0.0.1';
  let auth: boolean | undefined;
  let token: string | undefined;

  for (let i = 0; i < args.length; i++) {
    if (args[i] === '--port' || args[i] === '-p') {
      port = parseInt(args[i + 1], 10) || 3000;
      i++;
    } else if (args[i] === '--host' || args[i] === '-H') {
      host = args[i + 1] || '127.0.0.1';
      i++;
    } else if (args[i] === '--auth') {
      auth = true;
    } else if (args[i] === '--no-auth') {
      auth = false;
    } else if (args[i] === '--token' || args[i] === '-t') {
      token = args[i + 1];
      i++;
    } else if (args[i] === '--help' || args[i] === '-h') {
      console.log(`
AI Assistant (Standalone)

A terminal-based AI coding assistant with embedded Web UI.

Usage:
  ai-assistant [options]

Options:
  -p, --port <port>      Port to listen on (default: 3000)
  -H, --host <host>      Host to bind to (default: 127.0.0.1)
  --auth                 Enable authentication
  --no-auth              Disable authentication
  -t, --token <token>    Set authentication token
  -h, --help             Show this help message

Examples:
  # Local development
  ai-assistant

  # Listen on all interfaces with auth
  ai-assistant --host 0.0.0.0 --auth

  # Custom port and token
  ai-assistant --port 8080 --token mysecrettoken

After starting, open http://localhost:<port> in your browser.
      `);
      process.exit(0);
    }
  }

  return { port, host, auth, token };
}

// 主函数
async function main() {
  const { port, host, auth, token } = parseArgs();

  // 初始化嵌入的 WASM（在 Core 初始化之前）
  if (EMBEDDED_WASM.size > 0) {
    try {
      // 动态导入 core 模块来设置 WASM
      const core = await import('@ai-assistant/core');
      if (typeof core.setEmbeddedWasm === 'function') {
        core.setEmbeddedWasm(EMBEDDED_WASM);
        console.log(`[Server] Embedded WASM initialized (${EMBEDDED_WASM.size} files)`);
      }
    } catch (error) {
      console.warn('[Server] Failed to initialize embedded WASM:', error);
    }
  }

  // 初始化 SessionManager
  const sessionManager = getSessionManager();
  await sessionManager.init();

  // 初始化 Core
  const coreLoaded = await initCore();
  if (coreLoaded) {
    console.log('[Server] Core module initialized');
  } else {
    console.warn('[Server] Core module not available, running in limited mode');
  }

  // 初始化认证
  const isRemote = host !== '127.0.0.1' && host !== 'localhost';
  const authEnabled = auth !== undefined ? auth : isRemote;

  initAuth({
    enabled: authEnabled,
    tokens: [],
    skipPaths: ['/health', '/api/health'],
  });

  if (authEnabled) {
    const serverToken = token || generateToken();
    addToken(serverToken);
    console.log(`[Auth] Authentication enabled`);
    console.log(`[Auth] Token: ${serverToken}`);
  }

  const coreStatus = isCoreAvailable() ? '✅ Core loaded' : '⚠️  Core not available';
  const authConfig = getAuthConfig();
  const authStatus = authConfig.enabled ? '🔐 Enabled' : '🔓 Disabled';

  console.log(`
╔════════════════════════════════════════════╗
║     AI Assistant (Standalone)              ║
╠════════════════════════════════════════════╣
║  Web UI:      http://${host}:${port}
║  REST API:    http://${host}:${port}/api
║  WebSocket:   ws://${host}:${port}/api/ws/:sessionId
║  Health:      http://${host}:${port}/health
║  Agent:       ${coreStatus}
║  Auth:        ${authStatus}
║  Web UI:      📦 Embedded
╚════════════════════════════════════════════╝
  `);

  // 启动服务器
  const server = Bun.serve({
    port,
    hostname: host,
    fetch: app.fetch,
    websocket,
  });

  console.log(`Server running at http://${host}:${port}`);
  console.log(`Open http://${host === '0.0.0.0' ? 'localhost' : host}:${port} in your browser\n`);

  // 优雅关闭
  process.on('SIGINT', () => {
    console.log('\nShutting down server...');
    server.stop();
    process.exit(0);
  });

  process.on('SIGTERM', () => {
    console.log('\nShutting down server...');
    server.stop();
    process.exit(0);
  });
}

main().catch((error) => {
  console.error('Failed to start server:', error);
  process.exit(1);
});