import { useEffect, useRef, useState } from "react";
import { onChangeArgs, Product, InitialValues } from '../interfaces/interfaces';

interface useProductArgs {
    product: Product;
    onChange?: ( args: onChangeArgs ) => void;
    value?: number;
    initialValues?: InitialValues;
}

export const useProduct = ( { onChange, product, value = 0, initialValues }: useProductArgs ) => {
    
    const [counter, setCounter] = useState<number>( initialValues?.count || value );
    const isMounted = useRef(false);        
    
    const increaseBy = ( value: number ) => {

        let newValue = Math.max( counter + value, 0 );
        if( initialValues?.maxCount ) {
            newValue = Math.min( newValue, initialValues.maxCount )
        }

        setCounter( newValue );
        onChange && onChange({ count: newValue, product });
    }

    const reset = () => {
        setCounter( initialValues?.count || value );
    }

    useEffect(() => {
        if( !isMounted.current ) return;        
        setCounter( value );
    }, [ value ]);

    useEffect(() => {
        isMounted.current = true;  
    }, []);
        

    return {
        counter,
        isMaxCountReached: !!initialValues?.count && initialValues?.maxCount === counter,
        maxCount: initialValues?.maxCount,
        
        increaseBy,
        reset
    }
}