using System.Collections;

namespace RhSolutions.ExcelExtensions;

public class Columns : IEnumerable<Column>
{
    public Range Range { get; }
    public Table ParentTable { get; }
    public int Length
    {
        get => Range.Columns.Count;
    }

    public Columns(Range range, Table parentTable)
    {
        Range = range;
        ParentTable = parentTable;
    }

    public Column this[int index]
    {
        get
        {
            if (index < 0 || index + 1 > Range.Columns.Count)
            {
                throw new IndexOutOfRangeException();
            }

            return new Column(Range.Columns[index + 1], ParentTable);
        }
    }

    public IEnumerator<Column> GetEnumerator()
    {
        return new ColumnsEnumerator(Range, ParentTable);
    }

    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
}