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
  };
};