import Cookies from "js-cookie";
const rememberMe = localStorage.getItem("rememberMe") === "true";
const COOKIE_EXPIRES_DAYS = rememberMe ? 15 : 1;
interface Backend {
  get(k: string): string | null;
  set(k: string, v: string): void;
  remove(k: string): void;
}

const localStore: Backend = {
  get: (k) => localStorage.getItem(k),
  set: (k, v) => localStorage.setItem(k, v),
  remove: (k) => localStorage.removeItem(k),
};

const cookieStore: Backend = {
  get: (k) => Cookies.get(k) ?? null,

  set: (k, v) =>
    Cookies.set(k, v, {
      path: "/",
      secure: true,
      sameSite: "strict",
      expires: COOKIE_EXPIRES_DAYS,
    }),
  remove: (k) => Cookies.remove(k, { path: "/" }),
};

const AUTH_KEY_NAMES = [
  "auth-token",
  "refresh-token",
  "auth-user",
  "profile-id",
  "current-profile",
];

let _prefix = "ema-auth";
let backend: Backend = localStore;

export function configureAuthStorage(prefix: string, useCookies = false) {
  _prefix = prefix;
  backend = useCookies ? cookieStore : localStore;
  if (useCookies) {
    // one-time cleanup: drop pre-migration localStorage leftovers so tokens live in cookies only
    AUTH_KEY_NAMES.forEach((k) => localStorage.removeItem(`${prefix}-${k}`));
  }
}

function key(k: string) {
  return `${_prefix}-${k}`;
}

export const authStorage = {
  getToken: () => backend.get(key("auth-token")) ?? undefined,
  setToken: (token: string) => backend.set(key("auth-token"), token),
  getRefreshToken: () => backend.get(key("refresh-token")) ?? undefined,
  setRefreshToken: (t: string) => backend.set(key("refresh-token"), t),
  getUser: <T = unknown>(): T | null => {
    try {
      return JSON.parse(backend.get(key("auth-user")) ?? "null") as T | null;
    } catch {
      return null;
    }
  },
  setUser: <T>(u: T) => backend.set(key("auth-user"), JSON.stringify(u)),
  getProfileId: () => backend.get(key("profile-id")) ?? undefined,
  setProfileId: (id: string) => backend.set(key("profile-id"), id),
  getProfile: <T = unknown>(): T | null => {
    try {
      return JSON.parse(
        backend.get(key("current-profile")) ?? "null",
      ) as T | null;
    } catch {
      return null;
    }
  },
  setProfile: <T>(p: T) =>
    backend.set(key("current-profile"), JSON.stringify(p)),
  removeProfile: () => backend.remove(key("current-profile")),
  clear: () => {
    [
      key("auth-token"),
      key("refresh-token"),
      key("auth-user"),
      key("profile-id"),
      key("current-profile"),
      key("profile-id"),
    ].forEach((k) => backend.remove(k));
    Object.keys(Cookies.get()).forEach((name) => {
      Cookies.remove(name);
      Cookies.remove(name, { path: "/" });
    });
  },
};