// import './init-dynamic-dirname';
import { WebUiConfig } from '../../index';
import { AuthHelper } from '../helper/SignToken';
import type { WebUiCredentialJson } from '@/napcat-webui-backend/src/types';
import { WebSocket, WebSocketServer } from 'ws';
import os from 'os';
import { IPty, spawn as ptySpawn } from 'napcat-pty';
import { randomUUID } from 'crypto';
import { LogWrapper } from '@/napcat-core/helper/log';

interface TerminalInstance {
  pty: IPty; // 改用 PTY 实例
  lastAccess: number;
  sockets: Set<WebSocket>;
  // 新增标识，用于防止重复关闭
  isClosing: boolean;
  // 新增：存储终端历史输出
  buffer: string;
}

class TerminalManager {
  private terminals: Map<string, TerminalInstance> = new Map();
  private wss: WebSocketServer | null = null;

  initialize (req: any, socket: any, head: any, logger?: LogWrapper) {
    logger?.log('[NapCat] [WebUi] terminal websocket initialized');
    this.wss = new WebSocketServer({
      noServer: true,
      verifyClient: async (info, cb) => {
        // 验证 token
        const url = new URL(info.req.url || '', 'ws://localhost');
        const token = url.searchParams.get('token');
        const terminalId = url.searchParams.get('id');

        if (!token || !terminalId) {
          // eslint-disable-next-line n/no-callback-literal
          cb(false, 401, 'Unauthorized');
          return;
        }

        // 解析token
        let Credential: WebUiCredentialJson;
        try {
          Credential = JSON.parse(Buffer.from(token, 'base64').toString('utf-8'));
        } catch (_e) {
          // eslint-disable-next-line n/no-callback-literal
          cb(false, 401, 'Unauthorized');
          return;
        }
        const config = await WebUiConfig.GetWebUIConfig();
        const validate = AuthHelper.validateCredentialWithinOneHour(config.token, Credential);
        if (!validate) {
          // eslint-disable-next-line n/no-callback-literal
          cb(false, 401, 'Unauthorized');
          return;
        }
        // eslint-disable-next-line n/no-callback-literal
        cb(true);
      },
    });
    this.wss.handleUpgrade(req, socket, head, (ws) => {
      this.wss?.emit('connection', ws, req);
    });
    this.wss.on('connection', async (ws, req) => {
      logger?.log('建立终端连接');
      try {
        const url = new URL(req.url || '', 'ws://localhost');
        const terminalId = url.searchParams.get('id')!;

        const instance = this.terminals.get(terminalId);

        if (!instance) {
          ws.close();
          return;
        }

        instance.sockets.add(ws);
        instance.lastAccess = Date.now();

        // 新增：发送当前终端内容给新连接
        if (ws.readyState === WebSocket.OPEN) {
          ws.send(JSON.stringify({ type: 'output', data: instance.buffer }));
        }

        ws.on('message', (data) => {
          if (instance) {
            const result = JSON.parse(data.toString());
            if (result.type === 'input') {
              instance.pty.write(result.data);
            }
            // 新增：处理 resize 消息
            if (result.type === 'resize') {
              instance.pty.resize(result.cols, result.rows);
            }
          }
        });

        ws.on('close', () => {
          instance.sockets.delete(ws);
          if (instance.sockets.size === 0 && !instance.isClosing) {
            instance.isClosing = true;
            if (os.platform() === 'win32') {
              process.kill(instance.pty.pid);
            } else {
              instance.pty.kill();
            }
          }
        });
      } catch (err) {
        console.error('WebSocket authentication failed:', err);
        ws.close();
      }
    });
  }

  // 修改：新增 cols 和 rows 参数，同步 xterm 尺寸，防止错位
  createTerminal (cols: number, rows: number) {
    const id = randomUUID();
    const shell = os.platform() === 'win32' ? 'powershell.exe' : 'bash';
    const pty = ptySpawn(shell, [], {
      name: 'xterm-256color',
      cols, // 使用客户端传入的 cols
      rows, // 使用客户端传入的 rows
      cwd: process.cwd(),
      env: {
        ...process.env,
        LANG: os.platform() === 'win32' ? 'chcp 65001' : 'zh_CN.UTF-8',
        TERM: 'xterm-256color',
      },
    });

    const instance: TerminalInstance = {
      pty,
      lastAccess: Date.now(),
      sockets: new Set(),
      isClosing: false,
      buffer: '', // 初始化终端内容缓存
    };
    pty.onData((data: any) => {
      // 追加数据到 buffer
      instance.buffer += data;
      // 发送数据给已连接的 websocket
      instance.sockets.forEach((ws) => {
        if (ws.readyState === WebSocket.OPEN) {
          ws.send(JSON.stringify({ type: 'output', data }));
        }
      });
    });
    pty.onExit(() => {
      this.closeTerminal(id);
    });

    this.terminals.set(id, instance);
    // 返回生成的 id 及对应实例，方便后续通知客户端使用该 id
    return { id, instance };
  }

  closeTerminal (id: string) {
    const instance = this.terminals.get(id);
    if (instance) {
      if (!instance.isClosing) {
        instance.isClosing = true;
        if (os.platform() === 'win32') {
          process.kill(instance.pty.pid);
        } else {
          instance.pty.kill();
        }
      }
      instance.sockets.forEach((ws) => ws.close());
      this.terminals.delete(id);
    }
  }

  getTerminal (id: string) {
    return this.terminals.get(id);
  }

  getTerminalList () {
    return Array.from(this.terminals.keys()).map((id) => ({
      id,
      lastAccess: this.terminals.get(id)!.lastAccess,
    }));
  }
}

export const terminalManager = new TerminalManager();