import { useLoadingStore } from "~/stores/loadingStore"

type MyHeaders = Record<string, string>

const makeLoadingKey = (path: string) => {
  // camel-case the path : auth/login -> authLogin
  if (path.endsWith("/")) {
    path = path.slice(0, -1)
  }
  if (path.startsWith("/")) {
    path = path.slice(1)
  }
  let words = path.split("/")
  words = words.filter((word) => !/^\d+$/.test(word))
  for (const [ix, word] of Object.entries(words.slice(1))) {
    words[parseInt(ix) + 1] = word[0].toUpperCase() + word.slice(1)
  }
  return words.join("")
}

const getCsrfCookie = () => {
  let cookie: string | undefined
  if (process.server) {
    cookie = useRequestHeaders(["cookie"])["cookie"]
  } else {
    cookie = document.cookie
  }
  if (!cookie) {
    return null
  }
  const csrfRow = cookie.split("; ").find((row) => row.startsWith("csrftoken="))
  if (!csrfRow) {
    return null
  }
  return csrfRow.split("=")[1]
}

const getHeaders = (includeCsrf = false): MyHeaders => {
  // @ts-expect-error TODO handle null values here
  const headers: MyHeaders = useRequestHeaders(["cookie"])
  if (includeCsrf) {
    const csfrToken = getCsrfCookie()
    if (csfrToken) {
      headers["X-CSRFTOKEN"] = csfrToken
    }
  }
  return headers
}

let host
// local
if (process.env.NODE_ENV !== "production") {
  host = "http://localhost:8000"
} else {
  // production server
  if (process.server) {
    // server-side rendering
    host = "http://localhost:8064"
  } else {
    host = "https://cineclub.ens.fr" //use env params ?
  }
}
const baseUrl = `${host}/api/`

export async function apiRequest<Type>(
  method: string,
  path: string,
  payload: Record<never, never> | undefined,
  params = {}
) {
  const loadingStore = useLoadingStore()

  const key = makeLoadingKey(path)
  loadingStore.markLoading(key)
  const response = await useAsyncData<Type>(key, () =>
    $fetch<Type>(baseUrl + path, {
      method: method,
      body: payload,
      credentials: "include",
      headers: getHeaders(method != "GET"),
      params: params,
    })
  )
  if (response.error.value) loadingStore.markError(key)
  else loadingStore.markDone(key)
  return response
}

export async function apiGet<Type>(path: string, params = {}) {
  return apiRequest<Type>("GET", path, undefined, params)
}

export async function apiPost<Type>(path: string, payload = {}, params = {}) {
  return apiRequest<Type>("POST", path, payload, params)
}

export async function apiPatch<Type>(path: string, payload = {}, params = {}) {
  return apiRequest<Type>("PATCH", path, payload, params)
}