frontend/src/api.js

const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000'

export async function predictMRI(file) {
  const form = new FormData()
  form.append('file', file)
  const res = await fetch(`${API_URL}/predict`, {
    method: 'POST',
    body: form,
  })
  if (!res.ok) {
    const text = await res.text().catch(() => '')
    throw new Error(text || `Request failed (${res.status})`)
  }
  return res.json()
}

export async function fetchHealth() {
  const res = await fetch(`${API_URL}/health`)
  if (!res.ok) throw new Error('Health check failed')
  return res.json()
}

export async function fetchMetrics() {
  const res = await fetch(`${API_URL}/metrics`)
  if (!res.ok) return null
  return res.json()
}