// Copyright 2009-2024 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
namespace CsvHelper.Configuration.Attributes;

/// <summary>
/// When reading, is used to get the field at
/// the given index. When writing, the fields
/// will be written in the order of the field
/// indexes.
/// </summary>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
public class IndexAttribute : Attribute, IMemberMapper, IParameterMapper
{
	/// <summary>
	/// Gets the index.
	/// </summary>
	public int Index { get; private set; }

	/// <summary>
	/// Gets the index end.
	/// </summary>
	public int IndexEnd { get; private set; }

	/// <summary>
	/// When reading, is used to get the field at
	/// the given index. When writing, the fields
	/// will be written in the order of the field
	/// indexes.
	/// </summary>
	/// <param name="index">The index.</param>
	/// <param name="indexEnd">The index end.</param>
	public IndexAttribute(int index, int indexEnd = -1)
	{
		Index = index;
		IndexEnd = indexEnd;
	}

	/// <inheritdoc />
	public void ApplyTo(MemberMap memberMap)
	{
		memberMap.Data.Index = Index;
		memberMap.Data.IndexEnd = IndexEnd;
		memberMap.Data.IsIndexSet = true;
	}

	/// <inheritdoc />
	public void ApplyTo(ParameterMap parameterMap)
	{
		parameterMap.Data.Index = Index;
		parameterMap.Data.IsIndexSet = true;
	}
}
