import { useMemo } from "../preact/hooks.ts";
import { toTitleLc } from "../scrapbox-userscript-std/dom.ts";
import type { Scrapbox } from "../scrapbox-jp%2Ftypes/userscript.ts";
declare const scrapbox: Scrapbox;
 
export const useSearch = (text: string, maxCandidates = 10): string[] => useMemo(() => {
  const textLc = toTitleLc(text);
  
  return scrapbox.Project.pages
    .flatMap((page) => {
      const index = page.titleLc.indexOf(textLc);
      if (index < 0) return [];
      return [{ index, ...page }];
    })
    .sort((a,b) => {
      // 1. 一致した箇所が早い順
      const diff = a.index - b.index;
      if (diff !== 0) return diff;
      // 2. 文字列が短い順
      const ldiff = a.title.length - b.title.length
      if (ldiff !== 0 ) return ldiff;
      // 3. つながっているリンク順
      if (a.exists !== b.exists) a.exists ? -1 : 1;
      // 4. 更新日時が新しい順
      return b.updated - a.updated;
    })
    .slice(0, maxCandidates)
    .map((page) => page.title)
}, [text, maxCandidates, scrapbox.Project.pages]);