using System;
using System.Collections.Generic;

namespace AMWD.Common.Tests.Extensions
{
	[TestClass]
	public class ExceptionExtensionsTest
	{
		[TestMethod]
		public void ShouldReturnExceptionMessage()
		{
			// arrange
			var exception = new Exception("This is a message.");

			// act
			string message = exception.GetMessage();

			// assert
			Assert.AreEqual(exception.Message, message);
		}

		[TestMethod]
		public void ShouldReturnInnerExceptionMessage()
		{
			// arrange
			var innerException = new Exception("Message from the inner side.");
			var outerException = new Exception("Message from the outer side.", innerException);

			// act
			string message = outerException.GetMessage();

			// assert
			Assert.AreEqual(innerException.Message, message);
		}

		[TestMethod]
		public void ShouldReturnRecursiveExceptionMessageFoInnerException()
		{
			// arrange
			var innerException = new Exception("Message from the inner side.");
			var outerException = new Exception("Message from the outer side. See the inner exception for details.", innerException);
			string expectedMessage = $"Message from the outer side. Message from the inner side.";

			// act
			string message = outerException.GetRecursiveMessage();

			// assert
			Assert.AreEqual(expectedMessage, message);
		}

		[TestMethod]
		public void ShouldReturnRecursiveExceptionMessageFoInnerExceptions()
		{
			// arrange
			var innerExceptions = new List<Exception>
			{
				new("Inner Exception 1."),
				new("Inner Exception 2. See the inner exception for details.", new Exception("Inner Exception of Exception 2.")),
				new("Inner Exception 3."),
				new("Inner Exception 4."),
				new("Inner Exception 5.")
			};
			var aggregateException = new AggregateException("Lots of exceptions.", innerExceptions);
			string expectedMessage = "Inner Exception 1. Inner Exception 2. Inner Exception of Exception 2. Inner Exception 3.";

			// act
			string message = aggregateException.GetRecursiveMessage();

			// assert
			Assert.AreEqual(expectedMessage, message);
		}
	}
}