import axios, { type AxiosError } from 'axios'

export const api = axios.create({
  baseURL: process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:5000',
  headers: { 'Content-Type': 'application/json' },
})

// Inject auth token on every request
api.interceptors.request.use((config) => {
  // TODO: replace with real token from cookie once auth is implemented
  const token = typeof window !== 'undefined'
    ? document.cookie.split('; ').find(r => r.startsWith('access-token='))?.split('=')[1]
    : null
  if (token) config.headers.Authorization = `Bearer ${token}`
  return config
})

// Normalize error responses
api.interceptors.response.use(
  (res) => res,
  (error: AxiosError<{ error: string }>) => {
    const status = error.response?.status
    if (status === 401) {
      // Redirect to login when auth is implemented
      if (typeof window !== 'undefined') window.location.href = '/login'
    }
    return Promise.reject(error)
  }
)

// Helper to extract error message from API response
export function getApiError(error: unknown): string {
  if (axios.isAxiosError(error)) {
    return error.response?.data?.error ?? error.message
  }
  return 'An unexpected error occurred'
}