#if XUNIT_NULLABLE
#nullable enable
#endif

using System;
using System.Globalization;

namespace Xunit.Sdk
{
	/// <summary>
	/// Exception thrown when Assert.Distinct fails.
	/// </summary>
#if XUNIT_VISIBILITY_INTERNAL
	internal
#else
	public
#endif
	partial class DistinctException : XunitException
	{
		DistinctException(string message) :
			base(message)
		{ }

		/// <summary>
		/// Creates an instance of the <see cref="DistinctException"/> class that is thrown
		/// when a duplicate item is found in a collection.
		/// </summary>
		/// <param name="item">The duplicate item</param>
		/// <param name="collection">The collection</param>
		public static DistinctException ForDuplicateItem(
			string item,
			string collection) =>
				new DistinctException(
					string.Format(
						CultureInfo.CurrentCulture,
						"Assert.Distinct() Failure: Duplicate item found{0}Collection: {1}{2}Item:       {3}",
						Environment.NewLine,
						Assert.GuardArgumentNotNull(nameof(collection), collection),
						Environment.NewLine,
						Assert.GuardArgumentNotNull(nameof(item), item)
					)
				);
	}
}