import React from 'react'
import { useTranslation } from '../i18n'

/**
 * LanguageSwitcher - A compact language toggle button
 *
 * Displays the current language (中/EN) and switches between Chinese and English on click.
 * Designed to be placed in the Layout header, next to the user avatar.
 */
export default function LanguageSwitcher() {
  const { locale, setLocale } = useTranslation()

  const toggle = () => {
    setLocale(locale === 'zh' ? 'en' : 'zh')
  }

  return (
    <button
      onClick={toggle}
      title={locale === 'zh' ? 'Switch to English' : 'Switch to Chinese'}
      className="text-xs font-medium px-2 py-1 rounded-md border border-gray-200 bg-white hover:bg-gray-50 text-gray-600 hover:text-gray-800 transition-colors min-h-[32px] min-w-[40px] flex items-center justify-center"
      aria-label={locale === 'zh' ? 'Switch to English' : 'Switch to Chinese'}
    >
      {locale === 'zh' ? '中' : 'EN'}
    </button>
  )
}