import { EditorState } from 'draft-js';
import React, {
  ReactElement,
  ReactNode,
  useEffect,
  useLayoutEffect,
  useRef,
} from 'react';
import { MentionPluginStore } from '.';

const useIsomorphicLayoutEffect =
  typeof window !== 'undefined' ? useLayoutEffect : useEffect;

export interface MentionSuggestionsPortalProps {
  offsetKey: string;
  store: MentionPluginStore;
  getEditorState(): EditorState;
  setEditorState(state: EditorState): void;
  children: ReactNode;
}

export default function MentionSuggestionsPortal(
  props: MentionSuggestionsPortalProps
): ReactElement {
  const searchPortal = useRef<HTMLSpanElement>();

  // Note: this is a workaround for an obscure issue: https://github.com/draft-js-plugins/draft-js-plugins/pull/667/files
  // Ideally we can remove this in the future.
  const searchPortalRef = (element: HTMLSpanElement): void => {
    searchPortal.current = element;
    props.store.setReferenceElement(element);
  };

  const updatePortalClientRect = (
    currentProps: MentionSuggestionsPortalProps
  ): void => {
    currentProps.store.updatePortalClientRect(currentProps.offsetKey, () =>
      searchPortal.current!.getBoundingClientRect()
    );
  };

  // When inputting Japanese characters (or any complex alphabet which requires
  // hitting enter to commit the characters), that action was causing a race
  // condition when we used UNSAFE_componentWillMount. By using componentDidMount
  // instead of UNSAFE_componentWillMount, the component will unmount unregister and
  // then properly mount and register after. Prior to this change,
  // UNSAFE_componentWillMount would not fire after componentWillUnmount even though it
  // was still in the DOM, so it wasn't re-registering the offsetkey.
  useIsomorphicLayoutEffect(() => {
    props.store.register(props.offsetKey);
    props.store.setIsOpened(true);
    updatePortalClientRect(props);
    // trigger a re-render so the MentionSuggestions becomes active
    props.store.setEditorState!(props.store.getEditorState!());
    return () => {
      props.store.unregister(props.offsetKey);
      props.store.setIsOpened(false);
      props.store.setReferenceElement(null);
    };
  }, []);

  useEffect(() => {
    updatePortalClientRect(props);
  });

  return <span ref={searchPortalRef}>{props.children}</span>;
}