Topping

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PizzaCalories
{
    public class Topping
    {
        private const double MinWeight = 1;
        private const double MaxWeight = 50;

        private const double meat = 1.2;
        private const double veggies = 0.8;
        private const double cheese = 1.1;
        private const double sauce = 0.9;

        private string name;
        private double weight;

        public Topping(string name, double weight)
        {
            this.Name = name;
            this.Weight = weight;
        }

        public string Name
        {
            get => this.name;
            set
            {
                if (value.ToLower() != "meat" && value.ToLower() != "veggies" &&
                    value.ToLower() != "cheese" && value.ToLower() != "sauce")
                {
                    throw new InvalidOperationException(String.Format
                        (Exceptions.InvalidToppingNameException, value));
                }
                this.name = value;
            }
        }

        public double Weight
        {
            get => this.weight;
            set
            {
                if (value < MinWeight || value > MaxWeight)
                {
                    throw new InvalidOperationException(String.Format
                        (Exceptions.InvalidToppingWeightException, this.Name));
                }
                this.weight = value;
            }
        }

        public double CalculateCalories()
        {
            double calories = 0.0;

            switch (Name.ToLower())
            {
                case "meat": calories = 2 * this.Weight * meat; break;
                case "veggies": calories = 2 * this.Weight * veggies; break;
                case "cheese": calories = 2 * this.Weight * cheese; break;
                case "sauce": calories = 2 * this.Weight * sauce; break;
                default:
                    break;
            }

            return calories;
        }
    }
}