// Every Greek and Hebrew word in the study with its transliteration, so a
// speaker can rehearse them. Reached from the Script and Finish stages.
import { useState } from 'react';
import { useApp } from '../context/AppContext.js';
import StudioShell from '../components/study/StudioShell.jsx';
import { buildPronunciationGuide } from '../utils/bibleUtils.jsx';
import { speakOriginalWord } from '../utils/wordStudy.js';

export default function PronunciationPage() {
  const { project, setCurrentPage } = useApp();
  const [search, setSearch] = useState('');
  const [copied, setCopied] = useState(false);

  const chapters = Array.isArray(project?.chapters) ? project.chapters : [];

  // Collect all words with chapter context, deduplicated by Strong's number
  const seen = new Set();
  const entries = [];
  chapters.forEach((ch) => {
    ch.chunks.forEach((chunk) => {
      (chunk.greekWords ?? []).forEach((word) => {
        if (!word.lexeme && !word.transliteration) return;
        const key = word.strongNumber || `${word.lexeme}__${word.transliteration}`;
        if (seen.has(key)) return;
        seen.add(key);
        entries.push({ word, chapterRef: `${ch.book} ${ch.chapter}` });
      });
    });
  });

  const q = search.trim().toLowerCase();
  const filtered = q
    ? entries.filter(({ word }) => [word.englishGloss, word.shortDefinition, word.lexeme, word.transliteration, word.strongNumber]
      .some((f) => (f ?? '').toLowerCase().includes(q)))
    : entries;
  const greek = filtered.filter(({ word }) => !word.strongNumber?.startsWith('H'));
  const hebrew = filtered.filter(({ word }) => word.strongNumber?.startsWith('H'));

  const copyAll = () => {
    navigator.clipboard.writeText(buildPronunciationGuide(project)).then(() => {
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    });
  };
  const btn = 'rounded-xl border border-[var(--r-line)] px-4 py-2 text-sm hover:bg-black/5';

  return (
    <StudioShell stage="script">
      <main className="mx-auto max-w-4xl px-4 py-8">
        <div className="mb-6 flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
          <div>
            <h1 className="text-xl font-medium">Pronunciation Guide</h1>
            {project?.title && <p className="mt-1 text-sm text-[var(--r-sub)]">{project.title}</p>}
            <p className="mt-1 text-xs text-[var(--r-sub)]">{entries.length} unique word{entries.length !== 1 ? 's' : ''} across all chapters</p>
          </div>
          <div className="flex flex-wrap gap-2">
            <button type="button" onClick={copyAll} className={btn}>{copied ? '✓ Copied!' : 'Copy all'}</button>
            <button type="button" onClick={() => setCurrentPage('script')} className={btn}>← Back to Script</button>
          </div>
        </div>

        <input type="text" placeholder="Filter by word, gloss, Strong's number…" value={search} onChange={(e) => setSearch(e.target.value)}
          className="mb-6 w-full rounded-xl border border-[var(--r-line)] bg-[var(--r-bar)] px-4 py-2.5 text-sm text-[var(--r-text)] placeholder:text-[var(--r-sub)] focus:outline-none focus:ring-2 focus:ring-[var(--r-line)]" />

        {entries.length === 0 ? (
          <div className="rounded-2xl border border-dashed border-[var(--r-line)] p-12 text-center">
            <p className="font-medium">No words yet</p>
            <p className="mt-1 text-sm text-[var(--r-sub)]">Add Greek or Hebrew words in the Word study tab of the Study stage.</p>
          </div>
        ) : filtered.length === 0 ? (
          <p className="py-8 text-center text-sm text-[var(--r-sub)]">No words match “{search}”</p>
        ) : (
          <div className="space-y-8">
            {greek.length > 0 && <WordGroup title="Greek (New Testament)" words={greek} onSpeak={speakOriginalWord} />}
            {hebrew.length > 0 && <WordGroup title="Hebrew (Old Testament)" words={hebrew} onSpeak={speakOriginalWord} />}
          </div>
        )}
      </main>
    </StudioShell>
  );
}

function WordGroup({ title, words, onSpeak }) {
  return (
    <section>
      <h2 className="mb-3 text-sm font-medium">{title} <span className="font-normal text-[var(--r-sub)]">· {words.length} word{words.length !== 1 ? 's' : ''}</span></h2>
      <div className="grid gap-3 sm:grid-cols-2">
        {words.map(({ word, chapterRef }) => <WordCard key={word.id ?? word.lexeme} word={word} chapterRef={chapterRef} onSpeak={onSpeak} />)}
      </div>
    </section>
  );
}

function WordCard({ word, chapterRef, onSpeak }) {
  return (
    <div className="flex flex-col gap-3 rounded-2xl border border-[var(--r-line)] bg-[var(--r-bar)] p-5">
      <div className="flex items-start justify-between gap-3">
        <div className="min-w-0 flex-1">
          {word.lexeme && <p className="break-words font-serif text-3xl font-light leading-tight">{word.lexeme}</p>}
          {word.transliteration && <p className="mt-1 text-base italic text-[var(--r-sub)]">{word.transliteration}</p>}
        </div>
        <div className="flex shrink-0 flex-col items-end gap-2">
          {word.lexeme && <button type="button" onClick={() => onSpeak(word.lexeme, word.strongNumber)} className="rounded-lg border border-[var(--r-line)] px-3 py-1.5 text-xs hover:bg-black/5" title="Hear pronunciation">Speak</button>}
          {word.strongNumber && <span className="rounded-full border border-[var(--r-line)] px-2.5 py-0.5 text-xs text-[var(--r-sub)]">{word.strongNumber}</span>}
        </div>
      </div>
      <div className="space-y-0.5">
        {word.englishGloss && <p className="text-sm font-medium">{word.englishGloss}</p>}
        {word.shortDefinition && word.shortDefinition !== word.englishGloss && <p className="text-sm leading-snug text-[var(--r-sub)]">{word.shortDefinition}</p>}
      </div>
      <div className="flex flex-wrap items-center gap-2 border-t border-[var(--r-line)] pt-3 text-xs text-[var(--r-sub)]">
        {word.partOfSpeech && <span className="rounded-full border border-[var(--r-line)] px-2.5 py-0.5">{word.partOfSpeech}</span>}
        <span className="ml-auto">{chapterRef}</span>
      </div>
    </div>
  );
}