import axios, { type InternalAxiosRequestConfig } from "axios";
import { isLocale } from "../translations/config";
import { authBridge } from "./auth-bridge";
import { getClientCookie } from "./cookies";

const PROXY_PATH_PARAM = "__proxyPath";
function isAbsoluteUrl(url: string) {
  return /^[a-z][a-z\d+\-.]*:\/\//i.test(url);
}

function shouldUseProxy() {
  if (process.env.NEXT_PUBLIC_DISABLE_PROXY === "true") {
    return false;
  }

  if (typeof window === "undefined") {
    return false;
  }

  return true;
}

function withProxyPathParam(
  params: InternalAxiosRequestConfig["params"],
  proxyPath: string,
) {
  if (params instanceof URLSearchParams) {
    const nextParams = new URLSearchParams(params);
    nextParams.set(PROXY_PATH_PARAM, proxyPath);
    return nextParams;
  }

  if (typeof params === "string") {
    const nextParams = new URLSearchParams(params);
    nextParams.set(PROXY_PATH_PARAM, proxyPath);
    return nextParams;
  }

  return {
    ...(params && typeof params === "object" ? params : {}),
    [PROXY_PATH_PARAM]: proxyPath,
  };
}

export function getApiRequestUrl(path: string) {
  if (!isAbsoluteUrl(path) && shouldUseProxy()) {
    const searchParams = new URLSearchParams({
      [PROXY_PATH_PARAM]: path,
    });

    return `/api/proxy?${searchParams.toString()}`;
  }

  return `${process.env.NEXT_PUBLIC_API_BASE_URL}${path}`;
}

export const http = axios.create({
  baseURL: shouldUseProxy()
    ? "/api/proxy"
    : process.env.NEXT_PUBLIC_API_BASE_URL,
  headers: {
    Accept: "application/json",
    "Content-Type": "application/json",
  },
  withCredentials: true,
});

http.interceptors.request.use((config) => {
  if (shouldUseProxy() && config.url && !isAbsoluteUrl(config.url)) {
    config.params = withProxyPathParam(config.params, config.url);
    config.url = "";
  }

  const stripNoToken = (v: string | null) => (v && v !== "NO_TOKEN" ? v : null);

  const token =
    authBridge.getToken() ??
    stripNoToken(getClientCookie("HABIB_TOKEN")) ??
    stripNoToken(getClientCookie("habib_token"));

  if (token) {
    config.headers.Authorization = `Token ${token}`;
  }

  const pathSegment =
    typeof window !== "undefined"
      ? window.location.pathname.split("/")[1]
      : undefined;
  const docLang =
    typeof document !== "undefined" ? document.documentElement.lang : undefined;
  const cookieLanguage =
    getClientCookie("HABIB_LANGUAGE") ??
    getClientCookie("habib_language") ??
    undefined;
  const lang = isLocale(pathSegment)
    ? pathSegment
    : isLocale(cookieLanguage)
      ? cookieLanguage
      : isLocale(docLang)
        ? docLang
        : "en";

  config.headers["Accept-Language"] = lang;
  config.headers["X-User-Language"] = lang;

  return config;
});

http.interceptors.response.use(
  (response) => response,
  (error) => Promise.reject(error),
);