GCTC-NTGC / TalentCloud

import { Json } from "../hooks/webResourceHooks/types";

type HttpVerb = "GET" | "POST" | "PUT" | "DELETE";

const csrfElement = document.head.querySelector('meta[name="csrf-token"]');

const csrfToken: string =

  csrfElement && csrfElement.getAttribute("content")

    ? (csrfElement.getAttribute("content") as string)

    : "";

function jsonDateReplacer(key, value): string | any {

  if (this[key] instanceof Date) {

    return dayjs(value).format("YYYY-MM-DDTHH:mm:ssZ");

  }

  return value;

}

export function fetchParameters(method: HttpVerb, body?: any): RequestInit {

  const basicHeaders = {

    "X-CSRF-TOKEN": csrfToken,

    Accept: "application/json",

  };

  const jsonBodyHeader = { "Content-Type": "application/json" }; // informs server that the body is a json encoded string

  const headers =

    body !== undefined ? basicHeaders : { ...basicHeaders, ...jsonBodyHeader };

  // We must stringify any object bodies, and ensure dates are formatted as server expects.

  const stringBody =

    body instanceof Object ? JSON.stringify(body, jsonDateReplacer) : body;

  return {

    method,

    headers,

    credentials: "same-origin", // NOTE: This may change if we move to token auth.

    ...(stringBody && { body: stringBody }),

  };

}

function defaultFetch(

  endpoint: string,

  method: HttpVerb,

  body?: object,

): Promise<Response> {

  return fetch(endpoint, fetchParameters(method, body));

}

export function getRequest(endpoint: string): Promise<Response> {

  return defaultFetch(endpoint, "GET");

}

export function postRequest(endpoint: string, body: object): Promise<Response> {

  return defaultFetch(endpoint, "POST", body);

}

export function putRequest(endpoint: string, body: object): Promise<Response> {

  return defaultFetch(endpoint, "PUT", body);

}

export function deleteRequest(endpoint: string): Promise<Response> {

  return defaultFetch(endpoint, "DELETE");

}

  }

}

export async function processJsonResponse(response: Response): Promise<Json> {

  if (!response.ok) {

    throw new FetchError(response);

  }

  return response.json();

}