[Projeto] DeliveryFeeCalculation

namespace DeliveryFeeCalculation.Programs
{
    public static class DeliveryFeeConstants
    {
        public const decimal MinDistanceFee = 5m;
        public const decimal MedDistanceFee = 8m;
        public const decimal MaxDistanceFee = 10m;
        public const decimal RainingFee = 2m;

        public const int MinDistanceLimitKm = 5;
        public const int MedDistanceLimitKm = 10;
    }
    public class DeliveryFeeCalculator
    {
        public void CalculateAndShowFee()
        {
            ShowMenu();
            decimal distance = GetDistance();
            bool isRaining = GetWeather();

            decimal deliveryFee = CalculateFee(distance, isRaining);

            Console.WriteLine($"\nYOUR DELIVERYFEE FOR THIS CONDITIONS IS ${deliveryFee:F2}.");
        }
        /// <summary>
        /// Calculates delivery fee based on distance and whether it is raining.
        /// This method is the "business logic" and should be easy to test.
        /// </summary>
        /// <param name="distanceKm">Delivery distance in kilometers.</param>
        /// <param name="isRaining">True if it is raining, false otherwise.</param>
        /// <returns>The total delivery fee.</returns>

        public decimal CalculateFee(decimal distanceKm, bool isRaining)
        {
            decimal deliveryFee = 0m;

            if (distanceKm <= DeliveryFeeConstants.MinDistanceLimitKm)
            {
                deliveryFee = DeliveryFeeConstants.MinDistanceFee;
            }
            else if (distanceKm < DeliveryFeeConstants.MedDistanceLimitKm)
            {
                deliveryFee = DeliveryFeeConstants.MedDistanceFee;  
            }
            else
            {
                deliveryFee = DeliveryFeeConstants. MaxDistanceFee;
            }
            if (isRaining)
            {
                deliveryFee += DeliveryFeeConstants.RainingFee;
            }
            return deliveryFee;           
        }

        /// <summary>
        /// Requests the delivery distance from the user.
        /// </summary>
        /// <returns>The distance in kilometers.</returns>

        public static decimal GetDistance()
        {
            decimal distance;
            Console.WriteLine("\nHow far is the restaurant from your house?");

            //loop to ensure input is a valid, positive number
            while (!decimal.TryParse(Console.ReadLine(), out distance) || distance <= 0)
            {
                Console.WriteLine("\nInvalid input.Please enter an integer (ex. 2):");
            }
            return distance;
        }

        /// <summary>
        /// Ask the user about the weather condition.
        /// </summary>
        /// <returns>True if it is raining.</returns>
        public static bool GetWeather()
        {
            string answer;
            Console.WriteLine("\nIs it raining now? (Y/N)*");

            //loop to ensure a valid answer ('Y' or 'N')
            while (true)
            {
                answer = (Console.ReadLine() ?? "").Trim().ToUpper();
                if (answer == "Y") return true;
                if (answer == "N") return false;

                Console.WriteLine("Invalid answer. Please enter 'Y' for Yes or 'N' for No:");
            }
        }
        /// <summary>
        /// Displays the menu with fee details.
        /// </summary>
        public static void ShowMenu()
        {
            Console.WriteLine("TO COMPLETE YOUR PURCHASE, LET´S CALCULATE YOUR DELIVERY FEE. \nFOR THIS, ENTER SOME DETAILS.");

            Console.WriteLine("\nDETAILS OF THE FEE:" +
                $"\n${DeliveryFeeConstants.MinDistanceFee:F2}  =  Distance <= {DeliveryFeeConstants.MinDistanceLimitKm}KM." +
                $"\n${DeliveryFeeConstants.MedDistanceFee:F2}  =  Distance > {DeliveryFeeConstants.MinDistanceLimitKm}KM e <= {DeliveryFeeConstants.MedDistanceLimitKm}KM." +
                $"\n${DeliveryFeeConstants.MaxDistanceFee
                :F2} =  Distance > {DeliveryFeeConstants.MedDistanceLimitKm}KM." +
                $"\n${DeliveryFeeConstants.RainingFee:F2}  =  Additional Rain.");
        }
    }
}