// Search this chapter, or the whole Bible in the translation being read.
// BSB and NET are downloaded once and searched in the browser; ESV, NLT, CSB and
// NASB are searched through the server (their licences don't allow a bulk copy).
import { useMemo } from 'react';
import Sheet from './Sheet.jsx';
import { SearchIcon } from './icons.jsx';
import { bookOptions } from '../../utils/bibleUtils.jsx';

const nameFor = (abbrev) => bookOptions.find((b) => b.abbrev === abbrev)?.name ?? abbrev;
const escapeRegExp = (s) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

// Wraps each searched word (quotes ignored) in <mark>.
function highlight(text, query) {
  const words = [...new Set(query.toLowerCase().replace(/["“”]/g, ' ').split(/\s+/).filter((w) => w.length > 1))];
  if (!words.length) return text;
  const re = new RegExp(`(${words.map(escapeRegExp).join('|')})`, 'gi');
  return text.split(re).map((part, i) => (i % 2 === 1
    ? <mark key={i} className="rounded bg-[var(--r-hl)] px-0.5 text-[var(--r-text)]">{part}</mark>
    : part));
}

export default function SearchSheet({
  open, onClose, query, onQuery, scope, onScope, verses, bookName, chapter, currentBook, translation,
  isLocal, indexStatus, onLoadIndex, bibleMatches, deferredBibleQuery, remote, onJump,
}) {
  const q = query.trim().toLowerCase();
  const chapterMatches = useMemo(
    () => (scope === 'chapter' && q ? verses.filter((v) => v.text.toLowerCase().includes(q)) : []),
    [scope, q, verses],
  );

  const scopeBtn = (id, label, onClick) => (
    <button type="button" onClick={onClick}
      className={`px-3 py-1.5 text-xs ${scope === id ? 'bg-[var(--r-text)] text-[var(--r-bg)]' : 'text-[var(--r-sub)] hover:bg-black/5'}`}>{label}</button>
  );
  const note = (text) => <p className="text-sm text-[var(--r-sub)]">{text}</p>;
  const resultRow = (r) => (
    <button key={`${r.bookAbbrev}-${r.chapter}-${r.verse}`} type="button" onClick={() => onJump(r.bookAbbrev, r.chapter, r.verse)}
      className="block w-full rounded-lg px-2 py-2 text-left text-sm hover:bg-black/5">
      <span className="mr-1.5 font-medium">{nameFor(r.bookAbbrev)} {r.chapter}:{r.verse}</span>{highlight(r.text, query)}
    </button>
  );

  return (
    <Sheet open={open} onClose={onClose} title="Search">
      <div className="mb-3 flex items-center gap-2 rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-2">
        <span className="text-[var(--r-sub)]"><SearchIcon /></span>
        <input autoFocus value={query} onChange={(e) => onQuery(e.target.value)}
          placeholder={scope === 'bible' ? `Search the whole Bible (${translation})…` : `Search ${bookName} ${chapter}…`}
          className="min-w-0 flex-1 bg-transparent text-sm text-[var(--r-text)] outline-none placeholder:text-[var(--r-sub)]" />
      </div>
      <div className="mb-3 inline-flex overflow-hidden rounded-lg border border-[var(--r-line)]">
        {scopeBtn('chapter', 'This chapter', () => onScope('chapter'))}
        {scopeBtn('bible', `Whole Bible (${translation})`, () => { onScope('bible'); if (isLocal && indexStatus === 'idle') onLoadIndex(); })}
      </div>

      {scope === 'chapter' && (
        !q ? note('Type a word to find it in this chapter.')
          : chapterMatches.length === 0 ? note(`No verses match “${query}”.`)
            : chapterMatches.map((v) => (
              <button key={v.number} type="button" onClick={() => onJump(currentBook, chapter, v.number)}
                className="block w-full rounded-lg px-2 py-2 text-left text-sm hover:bg-black/5">
                <span className="mr-1.5 font-medium">{v.number}</span>{highlight(v.text, query)}
              </button>
            ))
      )}

      {scope === 'bible' && isLocal && (
        <>
          {indexStatus === 'loading' && note('Loading the full Bible for search. This happens once per visit (about 7 MB).')}
          {indexStatus === 'error' && <p className="text-sm text-[var(--r-danger,#b42318)]">Couldn’t load the full Bible. <button type="button" onClick={onLoadIndex} className="underline">Try again</button></p>}
          {indexStatus === 'ready' && (!deferredBibleQuery
            ? note('Type a word to search all 66 books.')
            : bibleMatches.length === 0
              ? note(`No verses match “${query}”.`)
              : (
                <>
                  <p className="mb-2 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">
                    {bibleMatches.length} match{bibleMatches.length === 1 ? '' : 'es'}{bibleMatches.length > 100 ? ' (showing first 100)' : ''}
                  </p>
                  {bibleMatches.slice(0, 100).map(resultRow)}
                </>
              ))}
        </>
      )}

      {scope === 'bible' && !isLocal && (
        <>
          {remote.tooShort && note('Type at least two letters. Use quotes for an exact phrase, like “good shepherd”.')}
          {!remote.tooShort && remote.error && <p className="text-sm text-[var(--r-danger,#b42318)]">{remote.error}</p>}
          {!remote.tooShort && !remote.error && remote.loading && remote.results.length === 0 && note('Searching…')}
          {!remote.tooShort && !remote.error && !remote.loading && remote.total === 0 && remote.page > 0 && note(`No verses match “${query}”.`)}
          {remote.results.length > 0 && (
            <>
              <p className="mb-2 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">
                {remote.total} match{remote.total === 1 ? '' : 'es'} in {translation}
              </p>
              {remote.results.map(resultRow)}
              {remote.hasMore && (
                <button type="button" onClick={remote.loadMore} disabled={remote.loading}
                  className="mt-2 w-full rounded-lg border border-[var(--r-line)] py-2 text-sm text-[var(--r-sub)] hover:bg-black/5 disabled:opacity-50">
                  {remote.loading ? 'Loading…' : 'Show more'}
                </button>
              )}
            </>
          )}
        </>
      )}
    </Sheet>
  );
}