export async function copyText(text: string) {
  if (window.isSecureContext && navigator.clipboard?.writeText) {
    try {
      await navigator.clipboard.writeText(text)
      return
    } catch {
      // HTTP 部署或宿主 WebView 里经常不可用，继续走兼容方案。
    }
  }

  fallbackCopyText(text)
}

function fallbackCopyText(text: string) {
  const textarea = document.createElement('textarea')
  const previousFocus = document.activeElement instanceof HTMLElement ? document.activeElement : null

  textarea.value = text
  textarea.setAttribute('readonly', 'true')
  textarea.style.position = 'fixed'
  textarea.style.left = '-9999px'
  textarea.style.top = '0'
  textarea.style.opacity = '0'
  document.body.appendChild(textarea)
  textarea.select()
  textarea.setSelectionRange(0, textarea.value.length)

  const copied = document.execCommand('copy')

  document.body.removeChild(textarea)
  previousFocus?.focus()

  if (!copied) {
    throw new Error('复制失败')
  }
}