const MP_EMBED_KEY = 'yxg_mp_embed'
const MP_QUERY = 'mp'

/** Apply document-level embed chrome (safe-area wash, hide HTML title). */
export function applyMpEmbedDom(): void {
  if (typeof document === 'undefined' || !isMpEmbed()) return
  document.title = '\u200b'
  document.documentElement.classList.add('mp-embed')
}

/** Persist ?mp=1 from mini-program web-view entry. Call once before router mount. */
export function initMpEmbed(): void {
  if (typeof window === 'undefined') return
  const params = new URLSearchParams(window.location.search)
  if (params.get(MP_QUERY) === '1') {
    sessionStorage.setItem(MP_EMBED_KEY, '1')
  }
  applyMpEmbedDom()
}

/** True when H5 runs inside WeChat mini-program web-view (no H5 tab bar). */
export function isMpEmbed(): boolean {
  if (typeof window === 'undefined') return false
  return sessionStorage.getItem(MP_EMBED_KEY) === '1'
}