import axios from "axios";
import { isAuthenticatedPromise, type Payload } from "./router/authGuard";
import router from "./router";
import { useNotificationStore } from "./stores/notification";
import { EventSourcePolyfill } from "event-source-polyfill";
import { config } from "./config";

let devMode = process.env.NODE_ENV === "development";

let host = devMode ? "localhost:5000" : (config.server_address ?? "").replace(/(^\w+:|^)\/\//, "");
let url = devMode ? "http://" + host : config.server_address;

const http = axios.create({
  baseURL: url + "/api",
  headers: {
    "Cache-Control": "no-cache",
    Pragma: "no-cache",
    Expires: "0",
  },
});

http.interceptors.request.use(
  (config) => {
    const token = localStorage.getItem("accessToken");
    if (token) {
      if (config.headers) {
        config.headers.Authorization = `Bearer ${token}`;
      }
    }

    const isPWA =
      window.matchMedia("(display-mode: standalone)").matches ||
      window.matchMedia("(display-mode: fullscreen)").matches;
    if (isPWA) {
      if (config.headers) {
        config.headers["X-PWA-Client"] = isPWA ? "true" : "false";
      }
    }

    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

http.interceptors.response.use(
  (response) => {
    return response;
  },
  async (error) => {
    if (!error.config.url.includes("/admin") && !error.config.url.includes("/user")) {
      return Promise.reject(error);
    }

    const originalRequest = error.config;

    // Handle token expiration and retry the request with a refreshed token
    if (error.response && error.response.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true;
      return await refreshToken()
        .then(() => {
          return http(originalRequest);
        })
        .catch(() => {});
    }

    const notificationStore = useNotificationStore();
    if (error.toString().includes("Network Error")) {
      notificationStore.push("Netzwerkfehler", "Server nicht erreichbar!", "error");
    } else {
      notificationStore.push("Fehler", error.response.data, "error");
    }

    return Promise.reject(error);
  }
);

export async function refreshToken(): Promise<void> {
  return new Promise<void>(async (resolve, reject) => {
    await http
      .post(`/auth/refresh`, {
        accessToken: localStorage.getItem("accessToken"),
        refreshToken: localStorage.getItem("refreshToken"),
      })
      .then(async (response) => {
        const { accessToken, refreshToken } = response.data;

        localStorage.setItem("accessToken", accessToken);
        localStorage.setItem("refreshToken", refreshToken);

        await isAuthenticatedPromise().catch((err: string) => {
          router.push({ name: err ?? "login" });
          reject(err);
        });

        resolve();
      })
      .catch((error) => {
        console.error("Error refreshing token:", error);
        reject("login");
      });
  });
}

function newEventSource(path: string) {
  const token = localStorage.getItem("accessToken");
  return new EventSourcePolyfill(url + "/api" + path, {
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });
}

async function* streamingFetch(path: string, abort?: AbortController) {
  await refreshToken()
    .then(() => {})
    .catch(() => {});

  const token = localStorage.getItem("accessToken");
  const response = await fetch(url + "/api" + path, {
    signal: abort?.signal,
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });

  const reader = response.body?.getReader();
  while (true && reader) {
    const { done, value } = await reader.read();
    if (done) break;
    yield new TextDecoder().decode(value);
  }
}

export { http, newEventSource, streamingFetch, host };