import { spawn } from "node:child_process";import fs from "node:fs";import http from "node:http";import os from "node:os";import path from "node:path";import type { Duplex } from "node:stream"; import {  EDITORS,  WS_CHANNELS,  WS_METHODS,  type TerminalEvent,  type WsPush,  type WsRequest,  type WsResponse,  wsRequestSchema,} from "@t3tools/contracts";import { WebSocketServer, type WebSocket } from "ws"; import { createLogger } from "./logger";import { ProjectRegistry } from "./projectRegistry";import { ProviderManager } from "./providerManager";import { GitManager } from "./gitManager";import {  checkoutGitBranch,  createGitBranch,  createGitWorktree,  initGitRepo,  listGitBranches,  removeGitWorktree,} from "./git";import { TerminalManager } from "./terminalManager"; const MIME_TYPES: Record<string, string> = {  ".html": "text/html; charset=utf-8",  ".js": "application/javascript; charset=utf-8",  ".css": "text/css; charset=utf-8",  ".json": "application/json; charset=utf-8",  ".png": "image/png",  ".jpg": "image/jpeg",  ".svg": "image/svg+xml",  ".ico": "image/x-icon",  ".woff": "font/woff",  ".woff2": "font/woff2",  ".ttf": "font/ttf",  ".map": "application/json",}; export interface ServerOptions {  port: number;  host?: string | undefined;  cwd: string;  staticDir?: string | undefined;  devUrl?: string | undefined;  logWebSocketEvents?: boolean | undefined;  projectRegistry?: ProjectRegistry | undefined;  gitManager?: GitManager | undefined;  terminalManager?: TerminalManager | undefined;  authToken?: string | undefined;} function parseBooleanEnv(value: string | undefined): boolean | undefined {  if (value === undefined) return undefined;  const normalized = value.trim().toLowerCase();  if (["1", "true", "yes", "on"].includes(normalized)) return true;  if (["0", "false", "no", "off"].includes(normalized)) return false;  return undefined;} export function createServer(options: ServerOptions) {  const {    port,    host,    cwd,    staticDir,    devUrl,    logWebSocketEvents: explicitLogWsEvents,    projectRegistry: providedRegistry,    gitManager: providedGitManager,    terminalManager: providedTerminalManager,    authToken,  } = options;  const providerManager = new ProviderManager();  const terminalManager = providedTerminalManager ?? new TerminalManager();  const projectRegistry =    providedRegistry ?? new ProjectRegistry(path.join(os.homedir(), ".t3", "userdata"));  const gitManager = providedGitManager ?? new GitManager();  const clients = new Set<WebSocket>();  const logger = createLogger("ws");  const logWebSocketEvents =    explicitLogWsEvents ?? parseBooleanEnv(process.env.T3CODE_LOG_WS_EVENTS) ?? Boolean(devUrl);   function logOutgoingPush(push: WsPush, recipients: number) {    if (!logWebSocketEvents) return;    logger.event("outgoing push", {      channel: push.channel,      recipients,      payload: push.data,    });  }   // Forward provider events to all connected WebSocket clients  providerManager.on("event", (event) => {    const push: WsPush = {      type: "push",      channel: WS_CHANNELS.providerEvent,      data: event,    };    const message = JSON.stringify(push);    let recipients = 0;    for (const client of clients) {      if (client.readyState === client.OPEN) {        client.send(message);        recipients += 1;      }    }    logOutgoingPush(push, recipients);  });   const onTerminalEvent = (event: TerminalEvent) => {    const push: WsPush = {      type: "push",      channel: WS_CHANNELS.terminalEvent,      data: event,    };    const message = JSON.stringify(push);    let recipients = 0;    for (const client of clients) {      if (client.readyState === client.OPEN) {        client.send(message);        recipients += 1;      }    }    logOutgoingPush(push, recipients);  };  terminalManager.on("event", onTerminalEvent);   // HTTP server — serves static files or redirects to Vite dev server  const httpServer = http.createServer((req, res) => {    // In dev mode, redirect to Vite dev server    if (devUrl) {      res.writeHead(302, { Location: devUrl });      res.end();      return;    }     // Serve static files from the web app build    if (!staticDir) {      res.writeHead(503, { "Content-Type": "text/plain" });      res.end("No static directory configured and no dev URL set.");      return;    }     const url = new URL(req.url ?? "/", `http://localhost:${port}`);    let filePath = path.join(staticDir, url.pathname);     // SPA fallback: if no file extension and not found, serve index.html    const ext = path.extname(filePath);    if (!ext) {      filePath = path.join(filePath, "index.html");    }     fs.stat(filePath, (err, stats) => {      if (err || !stats?.isFile()) {        // SPA fallback        const indexPath = path.join(staticDir, "index.html");        fs.readFile(indexPath, (readErr, data) => {          if (readErr) {            res.writeHead(404, { "Content-Type": "text/plain" });            res.end("Not Found");            return;          }          res.writeHead(200, { "Content-Type": "text/html; charset=utf-8" });          res.end(data);        });        return;      }       const fileExt = path.extname(filePath);      const contentType = MIME_TYPES[fileExt] ?? "application/octet-stream";       fs.readFile(filePath, (readErr, data) => {        if (readErr) {          res.writeHead(500, { "Content-Type": "text/plain" });          res.end("Internal Server Error");          return;        }        res.writeHead(200, { "Content-Type": contentType });        res.end(data);      });    });  });   // WebSocket server — upgrades from the HTTP server  const wss = new WebSocketServer({ noServer: true });   function rejectUpgrade(socket: Duplex, statusCode: number, message: string): void {    socket.write(      `HTTP/1.1 ${statusCode} ${statusCode === 401 ? "Unauthorized" : "Bad Request"}\r\n` +        "Connection: close\r\n" +        "Content-Type: text/plain\r\n" +        `Content-Length: ${Buffer.byteLength(message)}\r\n` +        "\r\n" +        message,    );    socket.destroy();  }   httpServer.on("upgrade", (request, socket, head) => {    if (authToken) {      let providedToken: string | null = null;      try {        const url = new URL(request.url ?? "/", `http://localhost:${port}`);        providedToken = url.searchParams.get("token");      } catch {        rejectUpgrade(socket, 400, "Invalid WebSocket URL");        return;      }       if (providedToken !== authToken) {        rejectUpgrade(socket, 401, "Unauthorized WebSocket connection");        return;      }    }     wss.handleUpgrade(request, socket, head, (ws) => {      wss.emit("connection", ws, request);    });  });   wss.on("connection", (ws) => {    clients.add(ws);     // Send welcome message with project info    const segments = cwd.split(/[/\\]/).filter(Boolean);    const projectName = segments[segments.length - 1] ?? "project";     const welcome: WsPush = {      type: "push",      channel: WS_CHANNELS.serverWelcome,      data: { cwd, projectName },    };    logOutgoingPush(welcome, 1);    ws.send(JSON.stringify(welcome));     ws.on("message", (raw) => {      void handleMessage(ws, raw);    });     ws.on("close", () => {      clients.delete(ws);    });     ws.on("error", () => {      clients.delete(ws);    });  });   async function handleMessage(ws: WebSocket, raw: unknown) {    let request: WsRequest;    try {      const parsed = JSON.parse(String(raw));      request = wsRequestSchema.parse(parsed);    } catch {      const errorResponse: WsResponse = {        id: "unknown",        error: { message: "Invalid request format" },      };      ws.send(JSON.stringify(errorResponse));      return;    }     try {      const result = await routeRequest(request);      const response: WsResponse = { id: request.id, result };      ws.send(JSON.stringify(response));    } catch (err) {      const message = err instanceof Error ? err.message : "Unknown server error";      const response: WsResponse = {        id: request.id,        error: { message },      };      ws.send(JSON.stringify(response));    }  }   async function routeRequest(request: WsRequest): Promise<unknown> {    switch (request.method) {      case WS_METHODS.providersStartSession:        return providerManager.startSession(request.params as never);       case WS_METHODS.providersSendTurn:        return providerManager.sendTurn(request.params as never);       case WS_METHODS.providersInterruptTurn:        return providerManager.interruptTurn(request.params as never);       case WS_METHODS.providersRespondToRequest:        return providerManager.respondToRequest(request.params as never);       case WS_METHODS.providersStopSession: {        providerManager.stopSession(request.params as never);        return undefined;      }       case WS_METHODS.providersListSessions:        return providerManager.listSessions();       case WS_METHODS.projectsList:        return projectRegistry.list();       case WS_METHODS.projectsAdd:        return projectRegistry.add(request.params as never);       case WS_METHODS.projectsRemove:        projectRegistry.remove(request.params as never);        return undefined;       case WS_METHODS.shellOpenInEditor: {        const params = request.params as {          cwd: string;          editor: string;        };        if (!params?.cwd) throw new Error("cwd is required");        const editorDef = EDITORS.find((e) => e.id === params.editor);        if (!editorDef) throw new Error(`Unknown editor: ${params.editor}`);        if (!editorDef.command) {          // Can't open file manager programmatically from server, just succeed silently          return undefined;        }        const child = spawn(editorDef.command, [params.cwd], {          detached: true,          stdio: "ignore",        });        child.on("error", () => {          /* ignore spawn failures for detached editors */        });        child.unref();        return undefined;      }       case WS_METHODS.gitStatus:        return gitManager.status(request.params as never);       case WS_METHODS.gitRunStackedAction:        return gitManager.runStackedAction(request.params as never);      case WS_METHODS.gitListBranches:        return listGitBranches(request.params as never);       case WS_METHODS.gitCreateWorktree:        return createGitWorktree(request.params as never);       case WS_METHODS.gitRemoveWorktree:        return removeGitWorktree(request.params as never);       case WS_METHODS.gitCreateBranch:        return createGitBranch(request.params as never);       case WS_METHODS.gitCheckout:        return checkoutGitBranch(request.params as never);       case WS_METHODS.gitInit:        return initGitRepo(request.params as never);       case WS_METHODS.terminalOpen:        return terminalManager.open(request.params as never);       case WS_METHODS.terminalWrite:        await terminalManager.write(request.params as never);        return undefined;       case WS_METHODS.terminalResize:        await terminalManager.resize(request.params as never);        return undefined;       case WS_METHODS.terminalClear:        await terminalManager.clear(request.params as never);        return undefined;       case WS_METHODS.terminalRestart:        return terminalManager.restart(request.params as never);       case WS_METHODS.terminalClose:        await terminalManager.close(request.params as never);        return undefined;       case WS_METHODS.serverGetConfig:        return { cwd };       default:        throw new Error(`Unknown method: ${request.method}`);    }  }   function start() {    return new Promise<void>((resolve, reject) => {      const onError = (error: Error) => {        httpServer.off("error", onError);        reject(error);      };      httpServer.once("error", onError);      const onListening = () => {        httpServer.off("error", onError);        resolve();      };      if (host) {        httpServer.listen(port, host, onListening);        return;      }      httpServer.listen(port, onListening);    });  }   async function stop(): Promise<void> {    terminalManager.off("event", onTerminalEvent);    providerManager.stopAll();    providerManager.dispose();    terminalManager.dispose();     for (const client of clients) {      client.close();    }    clients.clear();     const isServerNotRunningError = (error: unknown): boolean => {      if (!(error instanceof Error)) return false;      const maybeCode = (error as NodeJS.ErrnoException).code;      return (        maybeCode === "ERR_SERVER_NOT_RUNNING" ||        error.message.toLowerCase().includes("not running")      );    };     const closeWebSocketServer = new Promise<void>((resolve, reject) => {      wss.close((error) => {        if (error && !isServerNotRunningError(error)) {          reject(error);          return;        }        resolve();      });    });     const closeHttpServer = new Promise<void>((resolve, reject) => {      httpServer.close((error) => {        if (error && !isServerNotRunningError(error)) {          reject(error);          return;        }        resolve();      });    });     await Promise.all([closeWebSocketServer, closeHttpServer]);  }   return { start, stop, httpServer };}