import { useState, useEffect } from 'react';

// A hook for persisting state to localStorage, now user-agnostic.
export function useLocalStorage<T>(key: string, initialValue: T): [T, React.Dispatch<React.SetStateAction<T>>] {
    
    // Create a static key.
    const storageKey = `yuki-app-${key}`;

    const [storedValue, setStoredValue] = useState<T>(() => {
        try {
            if (typeof window === 'undefined') return initialValue;
            const item = window.localStorage.getItem(storageKey);
            return item ? JSON.parse(item) : initialValue;
        } catch (error) {
            console.error(error);
            return initialValue;
        }
    });

    useEffect(() => {
        try {
            const item = window.localStorage.getItem(storageKey);
            if (item) {
                setStoredValue(JSON.parse(item));
            }
        } catch (error) {
            console.error(error);
        }
    }, [storageKey]);


    const setValue: React.Dispatch<React.SetStateAction<T>> = (value) => {
        try {
            const valueToStore = value instanceof Function ? value(storedValue) : value;
            setStoredValue(valueToStore);
            if (typeof window !== 'undefined') {
                window.localStorage.setItem(storageKey, JSON.stringify(valueToStore));
            }
        } catch (error) {
            console.error(error);
        }
    };
    return [storedValue, setValue];
}