using System.Collections;

namespace Numbers.NumberFactory;

/// <summary>
///     Base class for <see cref="INumbers" /> implementations
/// </summary>
/// <inheritdoc cref="INumbers" />
public abstract class AbstractNumbers : INumbers
{
    // TODO
    // private readonly List<long> _list;

    /// <summary>
    ///     Creates a new instance of <see cref="AbstractNumbers" /> with the given bounds.
    ///     Will generate the appropriate numbers based on the implementation of <see cref="PickNumber" />.
    /// </summary>
    /// <param name="lowerBound">Lower bound of the number range</param>
    /// <param name="upperBound">Upper bound of the number range</param>
    protected AbstractNumbers(long lowerBound, long upperBound)
    {
        // TODO
    }

    public long this[int index]
    {
        get
        {
            // TODO
            return -1L;
        }
    }

    public long LowerBound { get; }

    public long UpperBound { get; }

    public int Length => -1; // TODO

    public IEnumerator<long> GetEnumerator() => null!; // TODO

    IEnumerator IEnumerable.GetEnumerator() => null!; // TODO

    private void GenerateNumbers()
    {
        // TODO
    }

    /// <summary>
    ///     Determines whether the given number should be picked based on the task of a
    ///     specific <see cref="INumbers" /> implementation
    /// </summary>
    /// <param name="number">Number to check</param>
    /// <returns>True if the number should be picked; false otherwise</returns>
    protected abstract bool PickNumber(long number);
}