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 class UnauthorizedError extends Error {
  constructor() {
    super('Unauthorized')
    this.name = 'UnauthorizedError'
  }
}

export class ForbiddenError extends Error {
  constructor() {
    super('Forbidden')
    this.name = 'ForbiddenError'
  }
}

export const authFetchOrThrow = async (input: RequestInfo | URL, init?: RequestInit) => {
  const response = await authFetch(input, init)
  if (response.status === 401) {
    clearToken()
    throw new UnauthorizedError()
  }
  if (response.status === 403) {
    throw new ForbiddenError()
  }
  return response
}

export const readResponseText = async (response: Response) => {
  try {
    return (await response.text()).trim()
  } catch {
    return ''
  }
}