import type { FetchOptions } from 'ofetch'
import { $fetch, FetchError } from 'ofetch'

export type AnyObject = Record<string, unknown>

export type ApiClient = {
  get<T>(url: string, query?: AnyObject, options?: FetchOptions<'json'>): Promise<T>
  post<T>(url: string, body?: AnyObject, options?: FetchOptions<'json'>): Promise<T>
  put<T>(url: string, body?: AnyObject, options?: FetchOptions<'json'>): Promise<T>
  patch<T>(url: string, body?: AnyObject, options?: FetchOptions<'json'>): Promise<T>
  delete<T>(url: string, query?: AnyObject, options?: FetchOptions<'json'>): Promise<T>
}

export const useApi = (): ApiClient => {
  const config = useRuntimeConfig()
  const baseURL = config.public.apiBase ?? '/api'
  const client = $fetch.create({ baseURL, retry: 0 })

  const request = <T>(
    method: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE',
    url: string,
    options: FetchOptions<'json'> = {}
  ) => {
    const needsJsonBody = method === 'POST' || method === 'PUT'
    const needsMergePatch = method === 'PATCH'

    const headers = new Headers(options.headers as HeadersInit | undefined)

    if (needsMergePatch && !headers.has('Content-Type')) {
      headers.set('Content-Type', 'application/merge-patch+json')
    } else if (needsJsonBody && !headers.has('Content-Type')) {
      headers.set('Content-Type', 'application/json')
    }

    return client<T>(url, { ...options, method, headers })
  }

  return {
    get<T>(url: string, query: AnyObject = {}, options: FetchOptions<'json'> = {}) {
      return request<T>('GET', url, { ...options, query })
    },
    post<T>(url: string, body: AnyObject = {}, options: FetchOptions<'json'> = {}) {
      return request<T>('POST', url, { ...options, body })
    },
    put<T>(url: string, body: AnyObject = {}, options: FetchOptions<'json'> = {}) {
      return request<T>('PUT', url, { ...options, body })
    },
    patch<T>(url: string, body: AnyObject = {}, options: FetchOptions<'json'> = {}) {
      return request<T>('PATCH', url, { ...options, body })
    },
    delete<T>(url: string, query: AnyObject = {}, options: FetchOptions<'json'> = {}) {
      return request<T>('DELETE', url, { ...options, query })
    }
  }
}