import { API_URL, decodeJWT } from "@shared";
import { makeAutoObservable, runInAction } from "mobx";
import axios, { AxiosError } from "axios";

type LoginResponse = {
  token: string;
  user: {
    id: number;
    name: string;
    email: string;
    is_admin: boolean;
  };
};

class AuthStore {
  payload: LoginResponse | null = null;
  token: string | null = null;
  isLoading = false;
  error: string | null = null;

  constructor() {
    makeAutoObservable(this);
    this.initialize();
  }

  private initialize() {
    const storedToken = localStorage.getItem("token") || undefined;
    const decoded = decodeJWT(storedToken);

    if (decoded) {
      this.payload = decoded;
    } else {
      this.logout();
    }
  }

  private setAuthToken(token: string) {
    localStorage.setItem("token", token);
  }

  login = async (email: string, password: string) => {
    this.isLoading = true;
    this.error = null;

    try {
      const response = await axios.post<LoginResponse>(
        `${API_URL}/auth/login`,
        {
          email,
          password,
        }
      );

      const data = response.data;

      runInAction(() => {
        this.setAuthToken(data.token);
        this.payload = response.data;
        this.error = null;
      });
    } catch (error) {
      if (error instanceof AxiosError) {
        this.error =
          error.response?.data?.message || "Ошибка при входе в систему";
      } else {
        this.error = "Неизвестная ошибка при входе в систему";
      }
      throw new Error(this.error ?? "Неизвестная ошибка при входе в систему");
    } finally {
      this.isLoading = false;
    }
  };

  logout = () => {
    localStorage.removeItem("token");

    this.payload = null;
    this.error = null;
  };

  get isAuthenticated() {
    return this.payload !== null;
  }

  get user() {
    return this.payload?.user;
  }
}

export const authStore = new AuthStore();