namespace Terminal.Gui {

	/// <summary>
	/// Collection navigator for cycling selections in a <see cref="TableView"/>.
	/// </summary>
	public class TableCollectionNavigator : CollectionNavigatorBase {
		readonly TableView tableView;

		/// <summary>
		/// Creates a new instance for navigating the data in the wrapped <paramref name="tableView"/>.
		/// </summary>
		public TableCollectionNavigator (TableView tableView)
		{
			this.tableView = tableView;
		}

		/// <inheritdoc/>
		protected override object ElementAt (int idx)
		{
			var col = tableView.SelectedColumn;
			var rawValue = tableView.Table [idx, col];

			var style = this.tableView.Style.GetColumnStyleIfAny (col);
			return style?.RepresentationGetter?.Invoke (rawValue) ?? rawValue;
		}

		/// <inheritdoc/>
		protected override int GetCollectionLength ()
		{
			return tableView.Table.Rows;
		}
	}
}