import { writable, derived } from 'svelte/store';
import { auth as authApi } from '$api/client.js';

function createAuthStore() {
	const storedUser = typeof localStorage !== 'undefined' ? localStorage.getItem('pos_user') : null;
	const storedToken = typeof localStorage !== 'undefined' ? localStorage.getItem('pos_token') : null;

	const { subscribe, set, update } = writable({
		user: storedUser ? JSON.parse(storedUser) : null,
		token: storedToken || null,
		loading: false,
		error: null
	});

	return {
		subscribe,

		async login(username, password) {
			update((s) => ({ ...s, loading: true, error: null }));
			try {
				const res = await authApi.login(username, password);
				const { token, user } = res.data;
				localStorage.setItem('pos_token', token);
				localStorage.setItem('pos_user', JSON.stringify(user));
				set({ user, token, loading: false, error: null });
				return true;
			} catch (err) {
				update((s) => ({ ...s, loading: false, error: err.message }));
				return false;
			}
		},

		async pinLogin(pin) {
			update((s) => ({ ...s, loading: true, error: null }));
			try {
				const res = await authApi.pinLogin(pin);
				const { token, user } = res.data;
				localStorage.setItem('pos_token', token);
				localStorage.setItem('pos_user', JSON.stringify(user));
				set({ user, token, loading: false, error: null });
				return true;
			} catch (err) {
				update((s) => ({ ...s, loading: false, error: err.message }));
				return false;
			}
		},

		logout() {
			localStorage.removeItem('pos_token');
			localStorage.removeItem('pos_user');
			set({ user: null, token: null, loading: false, error: null });
		},

		clearError() {
			update((s) => ({ ...s, error: null }));
		}
	};
}

export const authStore = createAuthStore();

export const currentUser = derived(authStore, ($auth) => $auth.user);
export const isAuthenticated = derived(authStore, ($auth) => !!$auth.token);
export const userRole = derived(authStore, ($auth) => $auth.user?.role?.name?.toLowerCase() || '');