// 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
using CsvHelper.TypeConversion;
using System.Linq.Expressions;
using System.Reflection;

namespace CsvHelper.Configuration;

/// <summary>
/// The configured data for the member map.
/// </summary>
public class MemberMapData
{
	/// <summary>
	/// Gets the member type.
	/// </summary>
	public virtual Type Type
	{
		get
		{
			if (Member != null)
			{
				return Member.MemberType();
			}

			if (IsConstantSet)
			{
				return Constant?.GetType() ?? typeof(string);
			}

			if (IsDefaultSet)
			{
				return Default?.GetType() ?? typeof(string);
			}

			return typeof(string);
		}
	}

	/// <summary>
	/// Gets the <see cref="MemberInfo"/> that the data
	/// is associated with.
	/// </summary>
	public virtual MemberInfo? Member { get; private set; }

	/// <summary>
	/// Gets the list of column names.
	/// </summary>
	public virtual MemberNameCollection Names { get; } = new MemberNameCollection();

	/// <summary>
	/// Gets or sets the index of the name.
	/// This is used if there are multiple
	/// columns with the same names.
	/// </summary>
	public virtual int NameIndex { get; set; }

	/// <summary>
	/// Gets or sets a value indicating if the name was
	/// explicitly set. True if it was explicitly set,
	/// otherwise false.
	/// </summary>
	public virtual bool IsNameSet { get; set; }

	/// <summary>
	/// Gets or sets the column index.
	/// </summary>
	public virtual int Index { get; set; } = -1;

	/// <summary>
	/// Gets or sets the index end. The Index end is used to specify a range for use
	/// with a collection member. Index is used as the start of the range, and IndexEnd
	/// is the end of the range.
	/// </summary>
	public virtual int IndexEnd { get; set; } = -1;

	/// <summary>
	/// Gets or sets a value indicating if the index was
	/// explicitly set. True if it was explicitly set,
	/// otherwise false.
	/// </summary>
	public virtual bool IsIndexSet { get; set; }

	/// <summary>
	/// Gets or sets the type converter.
	/// </summary>
	public virtual ITypeConverter? TypeConverter { get; set; }

	/// <summary>
	/// Gets or sets the type converter options.
	/// </summary>
	public virtual TypeConverterOptions TypeConverterOptions { get; set; } = new TypeConverterOptions();

	/// <summary>
	/// Gets or sets a value indicating whether the field should be ignored.
	/// </summary>
	public virtual bool Ignore { get; set; }

	/// <summary>
	/// Gets or sets the default value used when a CSV field is empty.
	/// </summary>
	public virtual object? Default { get; set; }

	/// <summary>
	/// Gets or sets a value indicating whether this instance is default value set.
	/// the default value was explicitly set. True if it was
	/// explicitly set, otherwise false.
	/// </summary>
	public virtual bool IsDefaultSet { get; set; }

	/// <summary>
	/// Gets or setse a value indicating if the default value should be used when
	/// a type conversion failure happens. <c>true</c> to use the default, otherwise
	/// <c>false</c>.
	/// </summary>
	public virtual bool UseDefaultOnConversionFailure { get; set; }

	/// <summary>
	/// Gets or sets the constant value used for every record.
	/// </summary>
	public virtual object? Constant { get; set; }

	/// <summary>
	/// Gets or sets a value indicating if a constant was explicitly set.
	/// </summary>
	public virtual bool IsConstantSet { get; set; }

	/// <summary>
	/// Gets or sets the expression used to convert data in the
	/// row to the member.
	/// </summary>
	public virtual Expression? ReadingConvertExpression { get; set; }

	/// <summary>
	/// Gets or sets the expression to be used to convert the object
	/// to a field.
	/// </summary>
	public virtual Expression? WritingConvertExpression { get; set; }

	/// <summary>
	/// Gets or sets the expression use to validate a field.
	/// </summary>
	public virtual Expression? ValidateExpression { get; set; }

	/// <summary>
	/// Gets or sets the expression used to get the validation message when validation fails.
	/// </summary>
	public virtual Expression? ValidateMessageExpression { get; set; }

	/// <summary>
	/// Gets or sets a value indicating if a field is optional.
	/// </summary>
	public virtual bool IsOptional { get; set; }

	/// <summary>
	/// Initializes a new instance of the <see cref="MemberMapData"/> class.
	/// </summary>
	/// <param name="member">The member.</param>
	public MemberMapData(MemberInfo? member)
	{
		Member = member;
	}
}
