import React, { useEffect, useRef, useState } from 'react';

export const useDebounce = <T>(
    value: T,
    delay: number
): [T, React.Dispatch<React.SetStateAction<T>>] => {
    const [debouncedValue, setDebouncedValue] = useState(value);

    useEffect(() => {
        const handler = setTimeout(() => {
            setDebouncedValue(value);
        }, delay);

        return () => {
            clearTimeout(handler);
        };
    }, [value, delay]);

    return [debouncedValue, setDebouncedValue];
};

const UNINITIALIZED_SENTINEL = {};
export const useStaticValue = <T>(factory: () => T): T => {
    const valueRef = useRef<T>(UNINITIALIZED_SENTINEL as T);
    if (valueRef.current === UNINITIALIZED_SENTINEL) valueRef.current = factory();
    return valueRef.current;
};

export const useInstanceVariable = <T>(value: T) => {
    const ref = useRef(value);
    useEffect(() => {
        ref.current = value;
    }, [ref, value]);
    return ref;
};