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 { Spinner } from "@executor/react/components/spinner";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 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 }; function openOAuthPopup(  url: string,  onResult: (data: OAuthPopupResult) => void,  onClosed?: () => void,): void {  const w = 600, h = 700;  const left = window.screenX + (window.outerWidth - w) / 2;  const top = window.screenY + (window.outerHeight - h) / 2;  const popup = window.open(url, "mcp-oauth", `width=${w},height=${h},left=${left},top=${top},popup=1`);   let settled = false;  const settle = () => { settled = true; window.removeEventListener("message", onMsg); };   const onMsg = (e: MessageEvent) => {    if (e.origin === window.location.origin && e.data?.type === "executor:oauth-result" && !settled) {      settle();      onResult(e.data as OAuthPopupResult);    }  };  window.addEventListener("message", onMsg);   if (popup) {    const iv = setInterval(() => {      if (popup.closed) { clearInterval(iv); if (!settled) { settle(); onClosed?.(); } }    }, 500);  }} // ---------------------------------------------------------------------------// 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 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 needsOAuth = probe?.requiresOAuth === true && !tokens;  const canAdd = probe && !needsOAuth && !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() },      });      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 handleOAuth = useCallback(async () => {    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 });      openOAuthPopup(        result.authorizationUrl,        (data) => {          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 });          }        },        () => dispatch({ type: "oauth-cancelled" }),      );    } catch (e) {      dispatch({ type: "oauth-fail", error: e instanceof Error ? e.message : "Failed to start OAuth" });    }  }, [state.url, doStartOAuth]);   const handleAddRemote = useCallback(async () => {    if (!probe) return;    dispatch({ type: "add-start" });    try {      await doAdd({        path: { scopeId },        payload: {          transport: "remote" as const,          name: probe.serverName ?? probe.name,          endpoint: state.url.trim(),          auth: tokens            ? {                kind: "oauth2" as const,                accessTokenSecretId: tokens.accessTokenSecretId,                refreshTokenSecretId: tokens.refreshTokenSecretId,                tokenType: tokens.tokenType,                expiresAt: tokens.expiresAt,                scope: tokens.scope,              }            : { kind: "none" as const },        },      });      props.onComplete();    } catch (e) {      dispatch({ type: "add-fail", error: e instanceof Error ? e.message : "Failed to add source" });    }  }, [probe, tokens, state.url, doAdd, props]);   // ---- 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          type="button"          onClick={() => setTransport("remote")}          className={`flex-1 rounded-md px-3 py-1.5 text-sm font-medium transition-colors ${            transport === "remote"              ? "bg-background text-foreground shadow-sm"              : "text-muted-foreground hover:text-foreground"          }`}        >          Remote        </button>        <button          type="button"          onClick={() => setTransport("stdio")}          className={`flex-1 rounded-md px-3 py-1.5 text-sm font-medium transition-colors ${            transport === "stdio"              ? "bg-background text-foreground shadow-sm"              : "text-muted-foreground hover:text-foreground"          }`}        >          Stdio        </button>      </div>       {transport === "remote" ? (        <>          {/* URL input */}          <section className="space-y-2">            <Label>Server URL</Label>            <div className="flex gap-2">              <Input                value={state.url}                onChange={(e) => dispatch({ type: "set-url", url: (e.target as HTMLInputElement).value })}                placeholder="https://mcp.example.com"                className="flex-1 font-mono text-sm"                onKeyDown={(e) => {                  if (e.key === "Enter" && state.url.trim() && isIdle) handleProbe();                }}                disabled={isProbing}              />              {!probe && (                <Button onClick={handleProbe} disabled={!state.url.trim() || isProbing}>                  {isProbing ? <><Spinner className="size-3.5" /> Connecting…</> : "Connect"}                </Button>              )}            </div>            <p className="text-[12px] text-muted-foreground">              Supports Streamable HTTP and SSE transports.            </p>          </section>           {/* Server info card */}          {probe && (            <div className="flex items-center gap-3 rounded-lg border border-border bg-card px-4 py-3">              <div className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-muted text-muted-foreground">                <svg viewBox="0 0 16 16" className="size-4" fill="none">                  <rect x="2" y="3" width="12" height="10" rx="2" stroke="currentColor" strokeWidth="1.2" />                  <path d="M5 7h6M5 9.5h4" stroke="currentColor" strokeWidth="1.2" strokeLinecap="round" />                </svg>              </div>              <div className="min-w-0 flex-1">                <p className="truncate text-sm font-semibold text-card-foreground leading-none">                  {probe.serverName ?? probe.name}                </p>                <p className="mt-1 text-[12px] text-muted-foreground leading-none">                  {probe.connected                    ? `${probe.toolCount} tool${probe.toolCount !== 1 ? "s" : ""} available`                    : "OAuth required to discover tools"}                </p>              </div>              {probe.connected ? (                <Badge variant="outline" className="border-emerald-500/20 bg-emerald-500/10 text-[10px] text-emerald-600 dark:text-emerald-400">                  Connected                </Badge>              ) : (                <Badge variant="outline" className="border-amber-500/20 bg-amber-500/10 text-[10px] text-amber-600 dark:text-amber-400">                  OAuth required                </Badge>              )}            </div>          )}           {/* OAuth section */}          {probe?.requiresOAuth && !tokens && (            <section className="space-y-2.5">              {state.step === "probed" && (                <Button onClick={handleOAuth} className="w-full" variant="outline">                  <svg viewBox="0 0 16 16" fill="none" className="mr-1.5 size-3.5">                    <path d="M8 1a7 7 0 1 0 0 14A7 7 0 0 0 8 1z" stroke="currentColor" strokeWidth="1.2" />                    <path d="M8 4v4l2.5 1.5" stroke="currentColor" strokeWidth="1.2" strokeLinecap="round" strokeLinejoin="round" />                  </svg>                  Sign in with OAuth                </Button>              )}               {state.step === "oauth-starting" && (                <div className="flex items-center gap-2 rounded-lg border border-border bg-muted/30 px-3 py-2.5">                  <Spinner className="size-3.5" />                  <span className="text-xs text-muted-foreground">Starting authorization…</span>                </div>              )}               {state.step === "oauth-waiting" && (                <div className="flex items-center gap-2 rounded-lg border border-blue-500/30 bg-blue-500/5 px-3 py-2.5">                  <Spinner className="size-3.5 text-blue-500" />                  <span className="text-xs text-blue-600 dark:text-blue-400">Waiting for authorization in popup…</span>                </div>              )}            </section>          )}           {/* OAuth success */}          {tokens && (            <div className="flex items-center gap-2 rounded-lg border border-emerald-500/30 bg-emerald-500/5 px-3 py-2.5">              <svg viewBox="0 0 16 16" fill="none" className="size-3.5 text-emerald-500">                <path d="M3 8.5l3 3 7-7" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" />              </svg>              <span className="text-xs font-medium text-emerald-600 dark:text-emerald-400">Authenticated</span>            </div>          )}           {/* Error */}          {error && (            <div className="space-y-2">              <div className="rounded-lg border border-destructive/30 bg-destructive/5 px-3 py-2">                <p className="text-[12px] text-destructive">{error}</p>              </div>              <Button variant="outline" size="sm" onClick={() => dispatch({ type: "retry" })} className="text-xs">                Try again              </Button>

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