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path: root/fe/src/stores/auth.ts
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import type { Invalidator, Subscriber, Unsubscriber } from 'svelte/store';
import type { Preference } from '../types';
import { writable, derived } from 'svelte/store';

type Nullable<T> = T | null;

interface User {
    uuid: string;
    username: string;
}

interface TokenStore {
    subscribe: (run: Subscriber<Nullable<string>>, invalidate: Invalidator<Nullable<string>>) => Unsubscriber,
    authenticate: (newToken: string) => void,
    unauthenticate: () => void
}


interface UserStore {
    subscribe: (run: Subscriber<Nullable<User>>, invalidate: Invalidator<Nullable<User>>) => Unsubscriber,
    setUser: (user: User) => void,
    reset: () => void
}

interface PreferenceStore {
    subscribe: (run: Subscriber<Nullable<Preference>>, invalidate: Invalidator<Nullable<Preference>>) => Unsubscriber,
    set: (this: void, value: Nullable<Preference>) => void
}

function createTokenStore(): TokenStore {
    const storedToken = localStorage.getItem("token");
    const { subscribe, set } = writable<string | null>(storedToken); 

    function authenticate(newToken: string): void {
        try {
            localStorage.setItem("token", newToken);
            set(newToken);
        } catch (e) {
            console.error('error', e);
        }
    }

    function unauthenticate(): void {
        localStorage.removeItem("token");
        set(null);
    }

    return {
        subscribe, 
        authenticate,
        unauthenticate
    };
}

function onTokenChange ($token: Nullable<string>): boolean { 
    return $token ? true : false;
}

function createUserStore(): UserStore {
    const user = localStorage.getItem('user');
    const userObj: Nullable<User> = user ? JSON.parse(user) : null;
    const { subscribe, set } = writable<User | null>(userObj);
    
    const setUser = (user: User) => {
       localStorage.setItem('user', JSON.stringify(user));
       set(user);
    }

    const reset = () => {
        localStorage.removeItem('user');
        set(null);
    }

    return {
        subscribe,
        setUser,
        reset
    }
}


function createPreferenceStore(): PreferenceStore {
   const preferences = localStorage.getItem('preferences'); 
   const preferenceObj: Preference = preferences ? JSON.parse(preferences) : {
        color: "#FF0000",
        size: {
            size: 16,
            unit: 'oz'
        }
   };

   const { subscribe, set } = writable<Nullable<Preference>>(preferenceObj);

   return {
       subscribe,
       set
   }
}

export const token = createTokenStore();
export const authenticated = derived(token, onTokenChange);
export const user = createUserStore();
export const preferences = createPreferenceStore();