import { useState } from 'react';
import { isLocalId, useWorkspace } from '@/store/workspace';
import { useAccount } from '@/store/account';
import { useDownload } from '@/features/item/download';
import { iconOf } from '@/features/item/summary';
import { senderLabel } from '@/lib/sender';
import { formatSize, formatTime, formatTransferProgress } from '@/lib/format';
import { Icon } from '@/ui/Icon';
import { Button } from '@/ui/Button';
import styles from './ChatPane.module.css';

interface Props { id: string; compact?: boolean; onOpenFile: (id: string) => void; onDelete: (id: string) => void }

export function ChatMessage({ id, compact = false, onOpenFile, onDelete }: Props) {
  const item = useWorkspace((s) => s.byId[id]);
  const owner = useWorkspace((s) => s.channel?.role === 'owner');
  const retry = useWorkspace((s) => s.retrySend);
  const username = useAccount((s) => s.username);
  const download = useDownload();
  const [downloading, setDownloading] = useState(false);
  if (!item) return null;
  const sender = item.author;
  const name = senderLabel(item);
  const self = sender?.username !== undefined && sender.username === username;
  const local = isLocalId(id);
  const sending = local && item.state.kind === 'receiving';
  const failed = local && item.state.kind === 'incomplete';
  const ready = item.state.kind === 'complete';
  const deleteLabel = item.kind === 'file' ? `删除文件消息 ${item.name}` : '删除消息';
  async function save() {
    if (!item || downloading) return;
    setDownloading(true); try { await download(item); } finally { setDownloading(false); }
  }
  return <article className={`${styles.message} ${compact ? styles.compact : ''} ${sending ? styles.sending : ''}`}
    aria-label={item.kind === 'file' ? `${name} 上传了 ${item.name}` : `${name} 的消息`} aria-busy={sending}>
    {compact ? <time className={styles.gutterTime} dateTime={new Date(item.ts).toISOString()}>{formatTime(item.ts)}</time>
      : sender?.avatar ? <img className={styles.avatar} src={sender.avatar} alt={`${name} 的头像`} />
        : <span className={`${styles.avatar} ${styles.avatarFallback}`} role="img" aria-label={`${name} 的默认头像`}>{Array.from(name)[0] ?? '?'}</span>}
    <div className={styles.body}>
      {!compact ? <header><strong className={styles.senderName} title={sender?.username}>{name}</strong><time>{formatTime(item.ts)}</time></header> : null}
      {item.state.kind === 'tampered' ? <p className={styles.integrity}>内容校验失败，已拒绝显示。</p> : item.kind === 'text' ? <p className={styles.messageText}>{item.text}</p>
        : <div className={styles.fileCard}>
          <button type="button" className={styles.fileOpen} aria-label={`预览文件 ${item.name}`} disabled={!ready} onClick={() => onOpenFile(id)}>
            <span className={styles.fileIcon}><Icon name={iconOf(item)} size={28} /></span>
            <span className={styles.fileInfo}><strong>{item.name}</strong><span>{formatSize(item.size)} · {item.mime}</span></span>
          </button>
          <Button variant="ghost" icon="eye" label="预览" disabled={!ready} onClick={() => onOpenFile(id)} />
          <Button variant="ghost" icon="download" label={downloading ? '下载中…' : '下载'} disabled={!ready || downloading} onClick={() => { void save(); }} />
        </div>}
      {item.state.kind === 'receiving' && item.kind === 'file' ? <div className={styles.delivery} role="status">{formatTransferProgress(item.state)}<progress max={1} value={item.state.progress} /></div>
        : failed ? <span className={styles.failure} role="alert">发送失败。<button type="button" onClick={() => { void retry(id); }}>重试</button></span>
          : item.state.kind === 'incomplete' ? <span className={styles.delivery}>发送未完成，等待续传。</span> : null}
    </div>
    {owner || self ? <Button className={styles.deleteAction} variant="ghost" icon="trash" label={deleteLabel} onClick={() => onDelete(id)} /> : null}
  </article>;
}