// @flow
import { stateFromMarkdown } from 'draft-js-import-markdown';
import { convertFromRaw, convertToRaw, EditorState } from 'draft-js';
import { addEmbedsToEditorState } from './add-embeds-to-draft-js';

export default (type: 'TEXT' | 'DRAFTJS', body: ?string): string => {
  let newBody = body;
  if (type === 'TEXT') {
    // workaround react-mentions bug by replacing @[username] with @username
    // @see withspectrum/spectrum#4587
    newBody = newBody ? newBody.replace(/@\[([a-z0-9_-]+)\]/g, '@$1') : '';
    newBody = JSON.stringify(
      convertToRaw(
        stateFromMarkdown(newBody, {
          customBlockFn: elem => {
            if (elem.nodeName !== 'PRE') return;

            const code = elem.childNodes.find(node => node.nodeName === 'CODE');
            if (!code) return;

            const className = code.attributes.find(
              ({ name }) => name === 'class'
            );
            if (!className) return;

            const lang = className.value.replace('lang-', '');

            return {
              type: null,
              data: {
                language: lang,
              },
            };
          },
          parserOptions: {
            atomicImages: true,
            breaks: true,
          },
        })
      )
    );
  }

  // Add automatic embeds to body
  try {
    return JSON.stringify(addEmbedsToEditorState(JSON.parse(newBody || '')));
    // Ignore errors during automatic embed detection
  } catch (err) {
    console.error(err);
    return newBody || '';
  }
};