export const getApiBase = () => process.env.NEXT_PUBLIC_API_BASE ?? '/api'

export const getToken = () => {
  if (typeof window === 'undefined') return null
  return window.localStorage.getItem('magent_token')
}

export const setToken = (token: string) => {
  if (typeof window === 'undefined') return
  window.localStorage.setItem('magent_token', token)
}

export const clearToken = () => {
  if (typeof window === 'undefined') return
  window.localStorage.removeItem('magent_token')
}

export const authFetch = (input: RequestInfo | URL, init?: RequestInit) => {
  const token = getToken()
  const headers = new Headers(init?.headers || {})
  if (token) {
    headers.set('Authorization', `Bearer ${token}`)
  }
  return fetch(input, { ...init, headers })
}

export const getEventStreamToken = async () => {
  const baseUrl = getApiBase()
  const response = await authFetch(`${baseUrl}/auth/stream-token`)
  if (!response.ok) {
    const text = await response.text()
    throw new Error(text || `Stream token request failed: ${response.status}`)
  }
  const data = await response.json()
  const token = typeof data?.stream_token === 'string' ? data.stream_token : ''
  if (!token) {
    throw new Error('Stream token not returned')
  }
  return token
}