// Author: fruit.com.cn
import { useEffect, useState } from 'react';
import { Send, X } from 'lucide-react';
import { engagementApi } from '../api/engagement';

function formatTime(value, htmlLang) {
  if (!value) return '';
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return '';
  return date.toLocaleString(htmlLang, { month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit' });
}

export function CommentsSheet({ video, locale, onClose, onPosted }) {
  const [comments, setComments] = useState(null);
  const [error, setError] = useState('');
  const [text, setText] = useState('');
  const [sending, setSending] = useState(false);

  const loadComments = () => engagementApi.comments({ dramaId: video.id, episodeId: video.preview?.id })
    .then((payload) => setComments(payload?.list || []))
    .catch((loadError) => { setError(loadError.message || 'Request failed'); setComments([]); });

  useEffect(() => {
    let active = true;
    setComments(null);
    setError('');
    engagementApi.comments({ dramaId: video.id, episodeId: video.preview?.id })
      .then((payload) => active && setComments(payload?.list || []))
      .catch((loadError) => active && setError(loadError.message || 'Request failed'));
    return () => { active = false; };
  }, [video.id, video.preview?.id]);

  const submit = async (event) => {
    event.preventDefault();
    const content = text.trim();
    if (!content || sending) return;
    setSending(true);
    setError('');
    try {
      await engagementApi.publishComment({ dramaId: video.id, episodeId: video.preview?.id, content });
      setText('');
      await loadComments();
      onPosted?.();
    } catch (postError) {
      setError(postError.message || 'Request failed');
    } finally {
      setSending(false);
    }
  };

  return (
    <>
      <button className="comments-backdrop" onClick={onClose} aria-label="Close comments" type="button" />
      <section className="comments-sheet" role="dialog" aria-label={locale.comments}>
        <header className="comments-header">
          <h2>{locale.comments}</h2>
          <button onClick={onClose} aria-label="Close" type="button"><X size={20} /></button>
        </header>
        <div className="comments-list">
          {comments === null && <p className="comments-note">{locale.loading}</p>}
          {error && <p className="comments-note warning">{error}</p>}
          {comments && !comments.length && !error && <p className="comments-note">{locale.noComments}</p>}
          {comments?.map((comment) => (
            <div className="comment-row" key={comment.id}>
              <span className="comment-avatar">{comment.nickname?.[0] || 'Y'}</span>
              <div className="comment-body">
                <b>{comment.nickname || 'Guest'}</b>
                <p>{comment.content}</p>
                <small>{formatTime(comment.createdAt, locale.htmlLang)}</small>
              </div>
            </div>
          ))}
        </div>
        <form className="comment-form" onSubmit={submit}>
          <input value={text} onChange={(event) => setText(event.target.value)} placeholder={locale.commentPlaceholder} aria-label={locale.commentPlaceholder} />
          <button type="submit" disabled={!text.trim() || sending} aria-label={locale.send}><Send size={18} /></button>
        </form>
      </section>
    </>
  );
}