// composables/useApi.js
import { ref } from 'vue'

export const ADMIN_TOKEN_COOKIE = 'admin_token'

export class ApiError extends Error {
  status: number
  constructor(message: string, status: number) {
    super(message)
    this.status = status
  }
}

function normalizeUrl(url: string): string {
  return url.replace(/\/+$/, '')
}

export default function useApi() {
  const config = useRuntimeConfig()
  const baseUrl = `${normalizeUrl(config.public.apiBaseUrl)}/api`

  // Generic GET request
  const get = async (endpoint) => {
    const res = await fetch(`${baseUrl}${endpoint}`)
    if (!res.ok) throw new ApiError(`API GET ${endpoint} failed`, res.status)
    return res.json()
  }

  // Generic POST request
  const post = async (endpoint, payload) => {
    const res = await fetch(`${baseUrl}${endpoint}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    })
    if (!res.ok) throw new ApiError(`API POST ${endpoint} failed`, res.status)
    return res.json()
  }

  // Authenticated requests (JWT stored in cookie by useAuth)
  const authHeaders = (): Record<string, string> => {
    const token = useCookie<string | null>(ADMIN_TOKEN_COOKIE).value
    return token ? { Authorization: `Bearer ${token}` } : {}
  }

  const getAuth = async (endpoint) => {
    const res = await fetch(`${baseUrl}${endpoint}`, { headers: authHeaders() })
    if (!res.ok) throw new ApiError(`API GET ${endpoint} failed`, res.status)
    return res.json()
  }

  const postAuth = async (endpoint, payload) => {
    const res = await fetch(`${baseUrl}${endpoint}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', ...authHeaders() },
      body: JSON.stringify(payload)
    })
    if (!res.ok) throw new ApiError(`API POST ${endpoint} failed`, res.status)
    return res.json()
  }

  return { get, post, getAuth, postAuth }
}