ex-oop-02-horse-race/HorseRace/Horse.cs

using System.ComponentModel;

namespace HorseRace;

public sealed class Horse
{
    public Horse(string name, int age, int startNo)
    {
        Name = name;
        Age = age;
        StartNumber = startNo;
    }

    public int Age { get; }
    public string Name { get; }
    public int Position { get; private set; }
    public int Rank { get; set; }
    public int StartNumber { get; }

    /// <summary>
    ///     Compares this <see cref="Horse" />, first by position and then by start number,
    ///     to the supplied <see cref="Horse" />
    /// </summary>
    /// <param name="other"><see cref="Horse" /> to compare to</param>
    /// <returns>The position difference between two horses</returns>
    public int CompareTo(Horse other)
    {
        int positionDifference = other.Position - Position;
        int startNumberDifference = other.StartNumber - StartNumber;
        
        if(positionDifference != 0)
        {
            return positionDifference;
        }
        
        return startNumberDifference;
    }

    /// <summary>
    ///     Draws the current position of this <see cref="Horse" /> to the console, including
    ///     its label and the finish line.
    /// </summary>
    public void Draw()
    {
        const int MaxSteps = HorseRace.MaxSteps;
        const char HorseSymbol = '*';
        
        Console.Write($"Horse {StartNumber,2}:");
        for (int i = 0; i < MaxSteps; i++)
        {
            Console.Write(Position == i ? HorseSymbol : " ");
        }
        Console.WriteLine("|");
    }

    /// <summary>
    ///     Randomly either increases or keeps the position of the <see cref="Horse" />.
    /// </summary>
    public void Move()
    {
        if (RandomProvider.Random.Next(0, 3) != 0)
        {
            return;
        }

        Position += 1;
    }

    /// <summary>
    ///     Attempts to parse a CSV formatted string to a <see cref="Horse" /> instance.
    ///     Also sets the supplied <see cref="startNo" /> if parsing succeeds.
    /// </summary>
    /// <param name="csvLine">Text to parse</param>
    /// <param name="startNo">Start number to set; must not be negative</param>
    /// <param name="horse">Set to the parsed instance; null if parsing fails</param>
    /// <returns>True if parsed successfully; false otherwise</returns>
    public static bool TryParse(string csvLine, int startNo, out Horse? horse)
    {
        horse = null;
        if (Contains(csvLine, ';') != 1)
        {
            return false;
        }

        if (startNo <= 0)
        {
            return false;
        }
        
        string name = "";
        int length = 0;
        for (int i = 0; i < csvLine.Length; i++)
        {
            if (csvLine[i] == ';')
            {
                length = i;
                break;
            }

            name += csvLine[i];
        }

        if (name == String.Empty)
        {
            return false;
        }

        string ageInString = "";
        for (int i = length + 1; i < csvLine.Length; i++)
        {
            ageInString += csvLine[i];
        }

        if (!int.TryParse(ageInString, out int age))
        {
            return false;
        }

        if (age < 0 || age > 10)
        {
            return false;
        }

        horse = new Horse(name, age, startNo);

        return true;

        int Contains(string line, char character)
        {
            int total = 0;
            for (int i = 0; i < line.Length; i++)
            {
                if (line[i] == character)
                {
                    total++;
                }
            }

            return total;
        }
    }
}