import { useEffect, useRef, useState } from "react"
import { InitialValues, OnChangeArgs, Product } from "../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?.maxCount && counter === initialValues?.maxCount,
        maxCount: initialValues?.maxCount,
        increaseBy,
        reset,
    }

}