import React, { ReactElement, useRef, useState } from 'react';
import { ContentState, EditorState } from 'draft-js';
import Editor from '@draft-js-plugins/editor';
import createMentionPlugin, {
  defaultSuggestionsFilter,
} from '@draft-js-plugins/mention';
import editorStyles from './editorStyles.css';
import mentions from './mentions';

const mentionPlugin = createMentionPlugin({
  mentionRegExp: '[\\w@\\._]',
  mentionTrigger: ['@'],
});
const { MentionSuggestions } = mentionPlugin;
const plugins = [mentionPlugin];

const MentionsTriggerInTrigger = (): ReactElement => {
  const [editorState, setEditorState] = useState(
    EditorState.createWithContent(
      ContentState.createFromText(
        'Type the "@rmo@mit.edu" email address: note that the second @ is allowed. '
      )
    )
  );

  const editor = useRef<Editor>();

  const [open, setOpen] = useState(false);
  const [search, setSearch] = useState('');

  const onChange = (value): void => {
    setEditorState(value);
  };

  const focus = (): void => {
    editor.current.focus();
  };

  const onOpenChange = (newOpen): void => {
    setOpen(newOpen);
  };

  const onSearchChange = ({ value }): void => {
    setSearch(value);
  };

  const onAddMention = (): void => {
    // get the mention object selected
  };

  return (
    <div className={editorStyles.editor} onClick={focus}>
      <Editor
        editorState={editorState}
        onChange={onChange}
        plugins={plugins}
        ref={(element) => {
          editor.current = element;
        }}
      />
      <MentionSuggestions
        open={open}
        suggestions={defaultSuggestionsFilter(search, mentions)}
        onOpenChange={onOpenChange}
        onSearchChange={onSearchChange}
        onAddMention={onAddMention}
      />
    </div>
  );
};

export default MentionsTriggerInTrigger;