using System;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace AMWD.Common.EntityFrameworkCore.Converters
{
	/// <summary>
	/// Defines the conversion from a nullable <see cref="DateOnly"/> object to a nullable <see cref="DateTime"/> which can be handled by the database engine.
	/// </summary>
	/// <remarks>
	/// As of 2022-06-04 only required for Microsoft SQL server on .NET 6.0.
	/// </remarks>
	public class NullableDateOnlyConverter : ValueConverter<DateOnly?, DateTime?>
	{
		/// <summary>
		/// Initializes a new instance of the <see cref="NullableDateOnlyConverter"/> class.
		/// </summary>
		public NullableDateOnlyConverter()
			: base(
				d => d == null ? null : new DateTime?(d.Value.ToDateTime(TimeOnly.MinValue)),
				d => d == null ? null : new DateOnly?(DateOnly.FromDateTime(d.Value))
			)
		{ }
	}
}