frontend/src/api/upload.ts

import { useAuthStore } from '../store/authStore'

export async function uploadCSV(
  topic_id: string,
  file: File,
): Promise<{ inserted: number }> {
  const token = useAuthStore.getState().accessToken
  const formData = new FormData()
  formData.append('file', file)
  formData.append('topic_id', topic_id)

  // Cannot use apiFetch here — browser must set Content-Type for multipart boundary
  const res = await fetch('/api/upload', {
    method: 'POST',
    headers: token ? { Authorization: `Bearer ${token}` } : {},
    body: formData,
    credentials: 'include',
  })
  if (!res.ok) {
    const err = await res.json()
    throw new Error(err.detail ?? 'Upload failed')
  }
  return res.json()
}