using System;

namespace DSALib.Auxiliary.Calculator
{
    /// <summary>
    ///     Provides an ISolvable class to save numbers. The class handles Argument checking and conversion from string to int.
    /// </summary>
    public class Argument : ISolvable
    {
        private readonly int value;

        public Argument(string value)
        {
            // check whether the value given is an empty string
            if (string.IsNullOrEmpty(value))
                throw new ArgumentException("Argument kann nicht mit einem leeren string instanziert werden. ",
                    nameof(value));

            if (!int.TryParse(value, out var result))
                throw new ArgumentException($"Kann {value} nicht in Integer konvertieren");

            this.value = result;
        }

        public int Solve()
        {
            return value;
        }

        public override string ToString()
        {
            return value.ToString();
        }
    }
}