/**
 * Bookworm Smart Assistant - Node.js 代理引导脚本
 *
 * 解决两个代理穿透问题：
 * 1. Node.js 20 undici fetch 不自动使用 https_proxy 环境变量
 * 2. ws (WebSocket) 库不自动走代理 —— 导致 Browserbase MCP 连接失败
 *
 * 用法: NODE_OPTIONS="--require /path/to/proxy-bootstrap.js" node app.js
 */

'use strict';

const proxyUrl = process.env.https_proxy || process.env.HTTPS_PROXY || process.env.http_proxy || process.env.HTTP_PROXY;

if (proxyUrl) {
  // 1) Patch undici fetch 走代理
  try {
    const { ProxyAgent, setGlobalDispatcher } = require('undici');
    const agent = new ProxyAgent(proxyUrl);
    setGlobalDispatcher(agent);
  } catch (e) {
    // undici 不可用时静默降级
  }

  // 2) Patch ws WebSocket 走代理（解决 Browserbase CDP 连接超时）
  try {
    const Module = require('module');
    const path = require('path');
    const originalLoad = Module._load;

    // 缓存代理 agent（延迟初始化）
    let proxyAgent = null;
    let wsModulePath = null;

    Module._load = function patchedLoad(request, parent, isMain) {
      const result = originalLoad.apply(this, arguments);

      // 只在首次加载 ws 模块时 patch
      if (request === 'ws' && typeof result === 'function' && !result.__proxyPatched) {
        // 记录 ws 模块的路径，用于后续解析 https-proxy-agent
        try {
          wsModulePath = path.dirname(Module._resolveFilename('ws', parent));
        } catch (e) {
          // ignore
        }

        const OrigWS = result;

        // 用 Proxy 包装，保持完整的原型链和 instanceof 检查
        const handler = {
          construct(target, args) {
            const address = args[0];

            // 只对外部 wss:// 连接注入代理
            if (typeof address === 'string' && address.startsWith('wss://')) {
              // 延迟创建代理 agent，从 ws 所在的 node_modules 解析 https-proxy-agent
              if (!proxyAgent) {
                try {
                  const agentPaths = [];
                  if (wsModulePath) agentPaths.push(wsModulePath);
                  // 也尝试 ws 的父目录（node_modules 层级）
                  if (wsModulePath) agentPaths.push(path.join(wsModulePath, '..'));
                  const agentModPath = require.resolve('https-proxy-agent', { paths: agentPaths });
                  const { HttpsProxyAgent } = require(agentModPath);
                  proxyAgent = new HttpsProxyAgent(proxyUrl);
                } catch (e) {
                  // 最后尝试全局解析
                  try {
                    const { HttpsProxyAgent } = require('https-proxy-agent');
                    proxyAgent = new HttpsProxyAgent(proxyUrl);
                  } catch (e2) {
                    // 无法获取代理 agent，放弃
                  }
                }
              }

              if (proxyAgent) {
                if (args.length <= 1) {
                  // new WebSocket(url) → new WebSocket(url, { agent })
                  args = [address, { agent: proxyAgent }];
                } else if (args.length === 2) {
                  const second = args[1];
                  if (typeof second === 'object' && second !== null && !Array.isArray(second)) {
                    // new WebSocket(url, options) → 注入 agent
                    if (!second.agent) second.agent = proxyAgent;
                  } else {
                    // new WebSocket(url, protocols) → 追加 options
                    args = [address, second, { agent: proxyAgent }];
                  }
                } else if (args.length >= 3) {
                  // new WebSocket(url, protocols, options)
                  const opts = args[2];
                  if (typeof opts === 'object' && opts !== null) {
                    if (!opts.agent) opts.agent = proxyAgent;
                  } else {
                    args[2] = { agent: proxyAgent };
                  }
                }
              }
            }

            return new target(...args);
          }
        };

        const proxied = new Proxy(OrigWS, handler);
        proxied.__proxyPatched = true;

        // 更新模块缓存，让后续 require('ws') 也返回 patched 版本
        try {
          const resolvedPath = Module._resolveFilename('ws', parent);
          if (Module._cache[resolvedPath]) {
            Module._cache[resolvedPath].exports = proxied;
          }
        } catch (e) {
          // ignore
        }

        return proxied;
      }

      return result;
    };
  } catch (e) {
    // ws patch 失败时静默降级
  }
}