import { createContext, useContext } from 'react';
import type { View } from 'react-native';

/**
 * Lets MarkdownText scroll the enclosing conversation ScrollView when an
 * in-document anchor link (e.g. `[jump](#setup)`) is tapped. The conversation
 * owns the ScrollView, so it provides this scroller; MarkdownText only hands it
 * the target heading view to bring into view.
 *
 * Null when MarkdownText is rendered outside a provider (e.g. standalone) — in
 * that case anchor links are simply no-ops.
 */
export type MarkdownScroller = {
  scrollViewIntoView: (target: View) => void;
};

export const MarkdownScrollContext = createContext<MarkdownScroller | null>(null);

export function useMarkdownScroll(): MarkdownScroller | null {
  return useContext(MarkdownScrollContext);
}