import { writable } from 'svelte/store';

export interface UserInfo {
  name?: string;
  preferred_username?: string;
  email?: string;
}

export interface AuthSession {
  accessToken: string;
  userInfo: UserInfo;
}

export interface AuthState {
  isAuthenticated: boolean;
  session: AuthSession | null;
  isLoading: boolean;
  showSignIn: boolean;
  bannerMessage: string;
  userInfo: UserInfo | null;
}

const BANNER_ANON = "⚠️ You are not logged in – anonymous users get only ~60 seconds of zero-GPU time per day. Sign in for higher limits.";

function createAuthStore() {
  const { subscribe, set, update } = writable<AuthState>({
    isAuthenticated: false,
    session: null,
    isLoading: true,
    showSignIn: false,
    bannerMessage: "",
    userInfo: null
  });

  return {
    subscribe,
    setSession: (session: AuthSession | null) => {
      update(state => ({
        ...state,
        isAuthenticated: !!session,
        session,
        isLoading: false,
        showSignIn: !session,
        bannerMessage: session ? "" : BANNER_ANON,
        userInfo: session?.userInfo || null
      }));
    },
    setLoading: (isLoading: boolean) => {
      update(state => ({ ...state, isLoading }));
    },
    setBannerMessage: (message: string) => {
      update(state => ({ ...state, bannerMessage: message }));
    },
    reset: () => {
      set({
        isAuthenticated: false,
        session: null,
        isLoading: false,
        showSignIn: true,
        bannerMessage: BANNER_ANON,
        userInfo: null
      });
    }
  };
}

export const authStore = createAuthStore();