using Numbers.NumberFactory.NumberImpls;

namespace Numbers.NumberFactory;

/// <summary>
///     A factory that creates <see cref="INumbers" /> instances
/// </summary>
public static class Factory
{
    /// <summary>
    ///     Creates an <see cref="INumbers" /> instance for the given <paramref name="type" />
    /// </summary>
    /// <param name="type">Number factory type to create</param>
    /// <param name="lowerBound">Lower bound of the number range</param>
    /// <param name="upperBound">Upper bound of the number range</param>
    /// <returns>Appropriate instance or null if requested type is unknown</returns>
    public static INumbers Create(NumberType type, long lowerBound, long upperBound)
    {
        switch (type)
        {
            case NumberType.Even:
                return new EvenNumbers(lowerBound, upperBound);
            case NumberType.Odd:
                return new OddNumbers(lowerBound, upperBound);
            case NumberType.Prime:
                return new PrimeNumbers(lowerBound, upperBound);
            case NumberType.Square:
                return new SquareNumbers(lowerBound, upperBound);
            default:
                return null!;
        }
    }
}

/// <summary>
///     Possible number factory types
/// </summary>
public enum NumberType
{
    Even,
    Odd,
    Square,
    Prime
}