import { useReducer, useCallback, useEffect, useRef, useState } from "react";import { useAtomSet } from "@effect-atom/atom-react"; import { useScope } from "@executor/react/api/scope-context";import { Button } from "@executor/react/components/button";import { Input } from "@executor/react/components/input";import { Label } from "@executor/react/components/label";import { Badge } from "@executor/react/components/badge";import { RadioGroup, RadioGroupItem } from "@executor/react/components/radio-group";import { Spinner } from "@executor/react/components/spinner";import { Textarea } from "@executor/react/components/textarea";import { SecretHeaderAuthRow } from "@executor/react/plugins/secret-header-auth";import { useSecretPickerSecrets } from "@executor/react/plugins/use-secret-picker-secrets";import { probeMcpEndpoint, addMcpSource, startMcpOAuth } from "./atoms";import { mcpPresets, type McpPreset } from "../sdk/presets"; // ---------------------------------------------------------------------------// Preset lookup// --------------------------------------------------------------------------- function findPreset(id: string | undefined): McpPreset | undefined {  if (!id) return undefined;  return mcpPresets.find((p) => p.id === id);} // ---------------------------------------------------------------------------// State machine (remote flow)// --------------------------------------------------------------------------- type OAuthTokens = {  accessTokenSecretId: string;  refreshTokenSecretId: string | null;  tokenType: string;  expiresAt: number | null;  scope: string | null;}; type ProbeResult = {  connected: boolean;  requiresOAuth: boolean;  name: string;  namespace: string;  toolCount: number | null;  serverName: string | null;}; type RemoteAuthMode = "none" | "header" | "oauth2"; type PlainHeader = {  name: string;  value: string;}; type State =  | { step: "url"; url: string }  | { step: "probing"; url: string }  | { step: "probed"; url: string; probe: ProbeResult }  | { step: "oauth-starting"; url: string; probe: ProbeResult }  | { step: "oauth-waiting"; url: string; probe: ProbeResult; sessionId: string }  | { step: "oauth-done"; url: string; probe: ProbeResult; tokens: OAuthTokens }  | { step: "adding"; url: string; probe: ProbeResult; tokens: OAuthTokens | null }  | {      step: "error";      url: string;      probe: ProbeResult | null;      tokens: OAuthTokens | null;      error: string;    }; type Action =  | { type: "set-url"; url: string }  | { type: "probe-start" }  | { type: "probe-ok"; probe: ProbeResult }  | { type: "probe-fail"; error: string }  | { type: "oauth-start" }  | { type: "oauth-waiting"; sessionId: string }  | { type: "oauth-ok"; tokens: OAuthTokens }  | { type: "oauth-fail"; error: string }  | { type: "oauth-cancelled" }  | { type: "add-start" }  | { type: "add-fail"; error: string }  | { type: "retry" }; const init: State = { step: "url", url: "" }; function reducer(state: State, action: Action): State {  switch (action.type) {    case "set-url":      return { step: "url", url: action.url };     case "probe-start":      return { step: "probing", url: state.url };     case "probe-ok":      return { step: "probed", url: state.url, probe: action.probe };     case "probe-fail":      return { step: "error", url: state.url, probe: null, tokens: null, error: action.error };     case "oauth-start":      if (state.step !== "probed" && state.step !== "error") return state;      return {        step: "oauth-starting",        url: state.url,        probe: state.step === "probed" ? state.probe : state.probe!,      };     case "oauth-waiting":      if (state.step !== "oauth-starting") return state;      return {        step: "oauth-waiting",        url: state.url,        probe: state.probe,        sessionId: action.sessionId,      };     case "oauth-ok":      if (state.step !== "oauth-waiting") return state;      return { step: "oauth-done", url: state.url, probe: state.probe, tokens: action.tokens };     case "oauth-fail":      if (state.step !== "oauth-starting" && state.step !== "oauth-waiting") return state;      return {        step: "error",        url: state.url,        probe: state.probe,        tokens: null,        error: action.error,      };     case "oauth-cancelled":      if (state.step !== "oauth-waiting") return state;      return { step: "probed", url: state.url, probe: state.probe };     case "add-start": {      const tokens =        state.step === "oauth-done" ? state.tokens : state.step === "probed" ? null : null;      const probe = "probe" in state ? state.probe : null;      if (!probe) return state;      return { step: "adding", url: state.url, probe, tokens };    }     case "add-fail":      if (state.step !== "adding") return state;      return {        step: "error",        url: state.url,        probe: state.probe,        tokens: state.tokens,        error: action.error,      };     case "retry": {      if (state.step !== "error") return state;      return state.probe        ? state.tokens          ? { step: "oauth-done", url: state.url, probe: state.probe, tokens: state.tokens }          : { step: "probed", url: state.url, probe: state.probe }        : { step: "url", url: state.url };    }     default:      return state;  }} // ---------------------------------------------------------------------------// OAuth popup// --------------------------------------------------------------------------- type OAuthPopupResult =  | ({ type: "executor:oauth-result"; ok: true; sessionId: string } & OAuthTokens)  | { type: "executor:oauth-result"; ok: false; sessionId: null; error: string }; const OAUTH_RESULT_CHANNEL = "executor:mcp-oauth-result"; const isOAuthPopupResult = (value: unknown): value is OAuthPopupResult =>  typeof value === "object" &&  value !== null &&  (value as { type?: unknown }).type === "executor:oauth-result"; function openOAuthPopup(  url: string,  onResult: (data: OAuthPopupResult) => void,  onOpenFailed?: () => void,): () => void {  const w = 600,    h = 700;  const left = window.screenX + (window.outerWidth - w) / 2;  const top = window.screenY + (window.outerHeight - h) / 2;   let settled = false;  const channel =    typeof BroadcastChannel !== "undefined" ? new BroadcastChannel(OAUTH_RESULT_CHANNEL) : null;  const settle = () => {    if (settled) return;    settled = true;    window.removeEventListener("message", onMsg);    channel?.close();  };   const handleResult = (data: unknown) => {    if (!isOAuthPopupResult(data) || settled) return;    settle();    onResult(data);  };   const onMsg = (e: MessageEvent) => {    if (e.origin === window.location.origin) handleResult(e.data);  };  window.addEventListener("message", onMsg);  if (channel) channel.onmessage = (e) => handleResult(e.data);   const popup = window.open(    url,    "mcp-oauth",    `width=${w},height=${h},left=${left},top=${top},popup=1`,  );  if (!popup && !settled) {    settle();    queueMicrotask(() => onOpenFailed?.());  }  return settle;} // ---------------------------------------------------------------------------// Component// --------------------------------------------------------------------------- export default function AddMcpSource(props: {  onComplete: () => void;  onCancel: () => void;  initialUrl?: string;  initialPreset?: string;}) {  const preset = findPreset(props.initialPreset);  const isStdioPreset = preset?.transport === "stdio";   const [transport, setTransport] = useState<"remote" | "stdio">(    isStdioPreset ? "stdio" : "remote",  );   // --- Stdio state ---  const [stdioCommand, setStdioCommand] = useState(isStdioPreset ? preset.command : "");  const [stdioArgs, setStdioArgs] = useState(    isStdioPreset && preset.args ? preset.args.join(" ") : "",  );  const [stdioEnv, setStdioEnv] = useState("");  const [stdioName, setStdioName] = useState(isStdioPreset ? preset.name : "");  const [stdioAdding, setStdioAdding] = useState(false);  const [stdioError, setStdioError] = useState<string | null>(null);   // --- Remote state ---  const remoteUrl =    !isStdioPreset && preset?.transport === undefined && preset?.url      ? preset.url      : (props.initialUrl ?? "");   const [state, dispatch] = useReducer(    reducer,    remoteUrl ? { step: "url" as const, url: remoteUrl } : init,  );   const scopeId = useScope();  const doProbe = useAtomSet(probeMcpEndpoint, { mode: "promise" });  const doAdd = useAtomSet(addMcpSource, { mode: "promise" });  const doStartOAuth = useAtomSet(startMcpOAuth, { mode: "promise" });  const secretList = useSecretPickerSecrets();   const [remoteAuthMode, setRemoteAuthMode] = useState<RemoteAuthMode>("none");  const [remoteHeaderAuth, setRemoteHeaderAuth] = useState<{    name: string;    prefix?: string;    presetKey?: string;    secretId: string | null;  }>({    name: "Authorization",    prefix: "Bearer ",    presetKey: "bearer",    secretId: null,  });  const [remoteHeaders, setRemoteHeaders] = useState<PlainHeader[]>([]);   const probe = "probe" in state ? state.probe : null;  const tokens = "tokens" in state ? state.tokens : null;  const isIdle = state.step === "url";  const isProbing = state.step === "probing";  const isAdding = state.step === "adding";  const isOAuthBusy = state.step === "oauth-starting" || state.step === "oauth-waiting";  const canUseNone = probe?.requiresOAuth !== true;  const headerAuthComplete = Boolean(remoteHeaderAuth.name.trim() && remoteHeaderAuth.secretId);  const remoteHeadersComplete = remoteHeaders.every(    (header) => header.name.trim() && header.value.trim(),  );  const authReady =    remoteAuthMode === "none"      ? canUseNone      : remoteAuthMode === "header"        ? headerAuthComplete        : tokens !== null;  const canAdd = Boolean(probe) && authReady && remoteHeadersComplete && !isAdding && !isOAuthBusy;  const error = state.step === "error" ? state.error : null;   // ---- Remote actions ----   const handleProbe = useCallback(async () => {    dispatch({ type: "probe-start" });    try {      const result = await doProbe({        path: { scopeId },        payload: { endpoint: state.url.trim() },      });      setRemoteAuthMode(result.requiresOAuth ? "oauth2" : "none");      dispatch({ type: "probe-ok", probe: result });    } catch (e) {      dispatch({ type: "probe-fail", error: e instanceof Error ? e.message : "Failed to connect" });    }  }, [state.url, scopeId, doProbe]);   const autoProbed = useRef(false);  useEffect(() => {    if (transport === "remote" && remoteUrl && !autoProbed.current) {      autoProbed.current = true;      handleProbe();    }  }, []); // eslint-disable-line react-hooks/exhaustive-deps   const oauthCleanup = useRef<(() => void) | null>(null);   const handleOAuth = useCallback(async () => {    oauthCleanup.current?.();    oauthCleanup.current = null;    dispatch({ type: "oauth-start" });    try {      const redirectUrl = `${window.location.origin}/api/mcp/oauth/callback`;      const result = await doStartOAuth({        path: { scopeId },        payload: { endpoint: state.url.trim(), redirectUrl },      });      dispatch({ type: "oauth-waiting", sessionId: result.sessionId });      oauthCleanup.current = openOAuthPopup(        result.authorizationUrl,        (data) => {          oauthCleanup.current = null;          if (data.ok) {            dispatch({              type: "oauth-ok",              tokens: {                accessTokenSecretId: data.accessTokenSecretId,                refreshTokenSecretId: data.refreshTokenSecretId,                tokenType: data.tokenType,                expiresAt: data.expiresAt,                scope: data.scope,              },            });          } else {            dispatch({ type: "oauth-fail", error: data.error });          }        },        () => {          oauthCleanup.current = null;          dispatch({ type: "oauth-fail", error: "OAuth popup was blocked" });        },      );    } catch (e) {      dispatch({        type: "oauth-fail",        error: e instanceof Error ? e.message : "Failed to start OAuth",      });    }  }, [state.url, scopeId, doStartOAuth]);   const handleCancelOAuth = useCallback(() => {    oauthCleanup.current?.();    oauthCleanup.current = null;    dispatch({ type: "oauth-cancelled" });  }, []);   const handleAddRemote = useCallback(async () => {    if (!probe) return;    dispatch({ type: "add-start" });    try {      const auth =        remoteAuthMode === "header"          ? {              kind: "header" as const,              headerName: remoteHeaderAuth.name.trim(),              secretId: remoteHeaderAuth.secretId!,              ...(remoteHeaderAuth.prefix ? { prefix: remoteHeaderAuth.prefix } : {}),            }          : remoteAuthMode === "oauth2" && tokens            ? {                kind: "oauth2" as const,                accessTokenSecretId: tokens.accessTokenSecretId,                refreshTokenSecretId: tokens.refreshTokenSecretId,                tokenType: tokens.tokenType,                expiresAt: tokens.expiresAt,                scope: tokens.scope,              }            : { kind: "none" as const };      const headers = Object.fromEntries(        remoteHeaders          .map((header) => [header.name.trim(), header.value.trim()] as const)          .filter(([name, value]) => name && value),      );       await doAdd({        path: { scopeId },        payload: {          transport: "remote" as const,          name: probe.serverName ?? probe.name,          endpoint: state.url.trim(),          auth,          ...(Object.keys(headers).length > 0 ? { headers } : {}),        },      });      props.onComplete();    } catch (e) {      dispatch({        type: "add-fail",        error: e instanceof Error ? e.message : "Failed to add source",      });    }  }, [    probe,    remoteAuthMode,    remoteHeaderAuth,    remoteHeaders,    tokens,    state.url,    doAdd,    props,    scopeId,  ]);   // ---- Stdio actions ----   const parseStdioArgs = (raw: string): string[] => {    if (!raw.trim()) return [];    const args: string[] = [];    const regex = /[^\s"]+|"([^"]*)"/g;    let match;    while ((match = regex.exec(raw)) !== null) {      args.push(match[1] ?? match[0]);    }    return args;  };   const parseStdioEnv = (raw: string): Record<string, string> | undefined => {    if (!raw.trim()) return undefined;    const env: Record<string, string> = {};    for (const line of raw.split("\n")) {      const eq = line.indexOf("=");      if (eq > 0) {        env[line.slice(0, eq).trim()] = line.slice(eq + 1).trim();      }    }    return Object.keys(env).length > 0 ? env : undefined;  };   const handleAddStdio = useCallback(async () => {    const cmd = stdioCommand.trim();    if (!cmd) return;    setStdioAdding(true);    setStdioError(null);    try {      await doAdd({        path: { scopeId },        payload: {          transport: "stdio" as const,          name: stdioName.trim() || cmd,          command: cmd,          args: parseStdioArgs(stdioArgs),          env: parseStdioEnv(stdioEnv),        },      });      props.onComplete();    } catch (e) {      setStdioError(e instanceof Error ? e.message : "Failed to add source");      setStdioAdding(false);    }  }, [stdioCommand, stdioArgs, stdioEnv, stdioName, doAdd, scopeId, props]);   // ---- Render ----   return (    <div className="space-y-6">      <div>        <h1 className="text-xl font-semibold text-foreground">Add MCP Source</h1>        <p className="mt-1 text-[13px] text-muted-foreground">          Connect to an MCP server to discover and use its tools.        </p>      </div>       {/* Transport toggle */}      <div className="flex gap-1 rounded-lg border border-border bg-muted/30 p-1">        <Button          variant="ghost"          type="button"          onClick={() => setTransport("remote")}

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