import type {  ToolActivityIcon,  ToolActivityNativeAppReference,  ToolActivitySource,  ToolActivitySurface,} from "@t3tools/contracts"; export interface ExtractedToolActivityPresentation {  readonly toolSurface?: ToolActivitySurface;  readonly toolIcon?: ToolActivityIcon;  readonly toolSource?: ToolActivitySource;} function asRecord(value: unknown): Record<string, unknown> | undefined {  return value !== null && typeof value === "object" && !Array.isArray(value)    ? (value as Record<string, unknown>)    : undefined;} function trimmedString(value: unknown, maxLength: number): string | undefined {  if (typeof value !== "string") return undefined;  const trimmed = value.trim();  return trimmed && trimmed.length <= maxLength ? trimmed : undefined;} function imageUrl(value: unknown): string | undefined {  const raw = trimmedString(value, 4096);  if (!raw) return undefined;  try {    const url = new URL(raw);    return url.protocol === "http:" || url.protocol === "https:" || url.protocol === "data:"      ? url.href      : undefined;  } catch {    return undefined;  }} function pageUrl(value: unknown): string | undefined {  const raw = trimmedString(value, 4096);  if (!raw) return undefined;  try {    const url = new URL(raw);    return url.protocol === "http:" || url.protocol === "https:" ? url.href : undefined;  } catch {    return undefined;  }} function nativeAppReference(value: unknown): ToolActivityNativeAppReference | undefined {  const app = asRecord(value);  const appId = trimmedString(app?.appId, 512);  if (app?._tag === "app-id" && appId && /^[A-Za-z0-9._-]+$/u.test(appId)) {    return { _tag: "app-id", appId };  }  const displayName = trimmedString(app?.displayName, 160);  if (app?._tag === "display-name" && displayName) {    return { _tag: "display-name", displayName };  }  return undefined;} function activityIcon(value: unknown): ToolActivityIcon | undefined {  const icon = asRecord(value);  if (icon?._tag === "website") {    const resolvedPageUrl = pageUrl(icon.pageUrl);    const faviconUrl = imageUrl(icon.faviconUrl);    const faviconUrlDark = imageUrl(icon.faviconUrlDark);    if (resolvedPageUrl) {      return {        _tag: "website",        pageUrl: resolvedPageUrl,        ...(faviconUrl ? { faviconUrl } : {}),        ...(faviconUrlDark ? { faviconUrlDark } : {}),      };    }  }  if (icon?._tag === "native-app") {    const app = nativeAppReference(icon.app);    if (app) return { _tag: "native-app", app };  }  if (icon?._tag === "themed-logo") {    const logoUrl = imageUrl(icon.logoUrl);    const logoUrlDark = imageUrl(icon.logoUrlDark);    if (logoUrl) {      return {        _tag: "themed-logo",        logoUrl,        ...(logoUrlDark ? { logoUrlDark } : {}),      };    }  }  return undefined;} function activitySource(value: unknown): ToolActivitySource | undefined {  const source = asRecord(value);  const key = trimmedString(source?.key, 512);  const name = trimmedString(source?.name, 160);  const kind = source?.kind;  if (!key || !name || (kind !== "browser" && kind !== "computer" && kind !== "integration")) {    return undefined;  }  const icon = activityIcon(source?.icon);  return { key, name, kind, ...(icon ? { icon } : {}) };} export function extractToolActivityPresentation(  payloadValue: unknown,): ExtractedToolActivityPresentation {  const payload = asRecord(payloadValue);  const toolSurface =    payload?.toolSurface === "browser" || payload?.toolSurface === "computer"      ? payload.toolSurface      : undefined;  const toolIcon = activityIcon(payload?.toolIcon);  const toolSource = activitySource(payload?.toolSource);  return {    ...(toolSurface ? { toolSurface } : {}),    ...(toolIcon ? { toolIcon } : {}),    ...(toolSource ? { toolSource } : {}),  };}