export type ExportFormat = 'pdf' | 'pptx' | 'html'

/** POST the current markdown to the server, then download the rendered file. */
export async function requestExport(markdown: string, format: ExportFormat): Promise<void> {
  const res = await fetch('/api/export', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ markdown, format }),
  })
  if (!res.ok) {
    let message = 'Export failed'
    try {
      const j = await res.json()
      message = j.detail || j.error || message
    } catch {
      /* ignore */
    }
    throw new Error(message)
  }
  const blob = await res.blob()
  const url = URL.createObjectURL(blob)
  const a = document.createElement('a')
  a.href = url
  a.download = `deck.${format}`
  document.body.appendChild(a)
  a.click()
  a.remove()
  URL.revokeObjectURL(url)
}