import { useMemo } from 'react';

import { analyze, type Analysis } from '../analysis/analyzer';
import type { SeoEditorEnv } from '../env';

import { useAnalysisInput } from './use-analysis-input';
import { useEditedPost, usePostMeta } from './use-seo-meta';

/**
 * The analysis of the post as it is edited, against its first keyword,
 * outside the panel: for the toolbar score and the publish check.
 *
 * @param env - The editor's environment.
 * @return The analysis, null where the object keeps no score, and the keyword.
 */
export const useLiveAnalysis = (
  env: SeoEditorEnv
): { analysis: Analysis | null; keyword: string } => {
  const { meta } = usePostMeta();
  const post = useEditedPost();
  const { input, live } = useAnalysisInput(env, meta, post);
  const scored = env.fields.includes(env.keys.score);
  const analysis = useMemo(
    () =>
      scored
        ? analyze({
            ...input,
            keyword: live.keyword,
            keywordUsedElsewhere: null,
          })
        : null,
    [scored, input, live.keyword]
  );
  return { analysis, keyword: live.keyword };
};