package errors

import (
	"errors"
	"fmt"
)

var ErrDivisionByZero = errors.New("cannot divide by zero")

func divide(a, b float64) (float64, error) {
	if b == 0 {
		return -1, ErrDivisionByZero
	}

	return a / b, nil
}

func isMultipleOf(a, b float64) (bool, error) {
	for {
		if a == 1 {
			return true, nil
		}

		if a < 1 {
			return false, nil
		}

		if val, err := divide(a, b); err != nil {
			return false, fmt.Errorf("error during divide() op: %w", err)
		} else {
			a = val
		}
	}

	return false, nil
}

func Errors() {
	if val, err := divide(1, 0); err != nil {
		fmt.Printf("Got error: %v\n", err)
	} else {
		fmt.Printf("1 / 0 = %f\n", val)
	}

	if _, err := isMultipleOf(6, 2); err != nil {
		fmt.Printf("Got error: %v\n", err)
	} else {
		fmt.Printf("6 is a multiple of 2\n")
	}

	if _, err := isMultipleOf(6, 0); err != nil {
		fmt.Printf("Got error: %v\n", err)

		if errors.Is(err, ErrDivisionByZero) {
			fmt.Printf("We encountered a division by zero error!\n")
		}
	} else {
		fmt.Printf("6 is a multiple of 0\n")
	}
}