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// Copyright 2009-2022 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 System;
using System.Globalization;
using CsvHelper.Configuration;

namespace CsvHelper.TypeConversion
{
	/// <summary>
	/// Converts a <see cref="DateTimeOffset"/> to and from a <see cref="string"/>.
	/// </summary>
	public class DateTimeOffsetConverter : DefaultTypeConverter
	{
		/// <summary>
		/// Converts the string to an object.
		/// </summary>
		/// <param name="text">The string to convert to an object.</param>
		/// <param name="row">The <see cref="IReaderRow"/> for the current record.</param>
		/// <param name="memberMapData">The <see cref="MemberMapData"/> for the member being created.</param>
		/// <returns>The object created from the string.</returns>
		public override object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
		{
			if (text == null)
			{
				return base.ConvertFromString(null, row, memberMapData);
			}

			var formatProvider = (IFormatProvider)memberMapData.TypeConverterOptions.CultureInfo.GetFormat(typeof(DateTimeFormatInfo)) ?? memberMapData.TypeConverterOptions.CultureInfo;
			var dateTimeStyle = memberMapData.TypeConverterOptions.DateTimeStyle ?? DateTimeStyles.None;

			DateTimeOffset dateTimeOffset;
			var success = memberMapData.TypeConverterOptions.Formats == null || memberMapData.TypeConverterOptions.Formats.Length == 0
				? DateTimeOffset.TryParse(text, formatProvider, dateTimeStyle, out dateTimeOffset)
				: DateTimeOffset.TryParseExact(text, memberMapData.TypeConverterOptions.Formats, formatProvider, dateTimeStyle, out dateTimeOffset);

			return success
				? dateTimeOffset
				: base.ConvertFromString(null, row, memberMapData);
		}
	}
}