using System;
using System.Linq;
using AMWD.Common.Tests.Utils;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using DescriptionAttribute = System.ComponentModel.DescriptionAttribute;

namespace AMWD.Common.Tests.Extensions
{
	[TestClass]
	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
	public class EnumExtensionsTests
	{
		[TestMethod]
		public void ShouldReturnEmptyList()
		{
			// arrange
			var enumValue = TestEnum.Two;

			// act
			var customList = enumValue.GetAttributes<CustomMultipleAttribute>();
			var descriptionList = enumValue.GetAttributes<DescriptionAttribute>();

			// assert
			Assert.IsNotNull(customList);
			Assert.IsFalse(customList.Any());
			Assert.IsNotNull(descriptionList);
			Assert.IsFalse(descriptionList.Any());
		}

		[TestMethod]
		public void ShouldReturnList()
		{
			// arrange
			var enumValue = TestEnum.Zero;

			// act
			var customList = enumValue.GetAttributes<CustomMultipleAttribute>();
			var descriptionList = enumValue.GetAttributes<DescriptionAttribute>();

			// assert
			Assert.IsNotNull(customList);
			Assert.IsTrue(customList.Any());
			Assert.AreEqual(2, customList.Count());
			Assert.IsNotNull(descriptionList);
			Assert.IsTrue(descriptionList.Any());
			Assert.AreEqual(1, descriptionList.Count());
		}

		[TestMethod]
		public void ShouldReturnNothing()
		{
			// arrange
			var enumValue = TestEnum.Two;

			// act
			var customAttribute = enumValue.GetAttribute<CustomMultipleAttribute>();
			var descriptionAttribute = enumValue.GetAttribute<DescriptionAttribute>();

			// assert
			Assert.IsNull(customAttribute);
			Assert.IsNull(descriptionAttribute);
		}

		[TestMethod]
		public void ShouldReturnFirstAttribute()
		{
			// arrange
			var enumValue = TestEnum.Zero;

			// act
			var customAttribute = enumValue.GetAttribute<CustomMultipleAttribute>();
			var descriptionAttribute = enumValue.GetAttribute<DescriptionAttribute>();

			// assert
			Assert.IsNotNull(customAttribute);
			Assert.AreEqual("nix", customAttribute.Name);
			Assert.IsNotNull(descriptionAttribute);
			Assert.AreEqual("Null", descriptionAttribute.Description);
		}

		[TestMethod]
		public void ShouldReturnDescriptionOrStringRepresentation()
		{
			// arrange
			var enumWithDescription = TestEnum.One;
			var enumWithoutDescripton = TestEnum.Two;

			// act
			string description = enumWithDescription.GetDescription();
			string noDescription = enumWithoutDescripton.GetDescription();

			// assert
			Assert.AreEqual("Eins", description);
			Assert.AreEqual(enumWithoutDescripton.ToString(), noDescription);
		}

		[TestMethod]
		public void ShouldReturnEmptyListOnNotDefinedEnumValue()
		{
			// arrange
			var notDefinedEnum = (TestEnum)10;

			// act
			var list = notDefinedEnum.GetAttributes<DescriptionAttribute>();

			// assert
			Assert.IsFalse(list.Any());
		}

		internal enum TestEnum
		{
			[CustomMultiple("nix")]
			[CustomMultiple("Null")]
			[Description("Null")]
			Zero,
			[Description("Eins")]
			One,
			Two,
		}
	}
}