using System.Text;
using Microsoft.AspNetCore.Http;
using Moq;
using Newtonsoft.Json;

namespace AMWD.Common.AspNetCore.Tests.Extensions
{
	[TestClass]
	public class SessionExtensionsTest
	{
		private Mock<ISession> _sessionMock;

		private string _sessionKey;
		private byte[] _sessionValue;

		private TestModel _model;

		internal class TestModel
		{
			public string ValueA { get; set; }

			public string ValueB { get; set; }
		}

		[TestInitialize]
		public void InitializeTests()
		{
			_sessionKey = null;
			_sessionValue = null;

			_model = new TestModel
			{
				ValueA = "A",
				ValueB = "B"
			};
		}

		[TestMethod]
		public void ShouldCheckKeyExists()
		{
			// arrange
			_sessionKey = "exists";
			var session = GetSession();

			// act
			bool result1 = session.HasKey("exists");
			bool result2 = session.HasKey("somewhere");

			// assert
			Assert.IsTrue(result1);
			Assert.IsFalse(result2);
		}

		[TestMethod]
		public void ShouldGetValue()
		{
			// arrange
			_sessionKey = "test";
			_sessionValue = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(_model));
			var session = GetSession();

			// act
			var result = session.GetValue<TestModel>(_sessionKey);

			// assert
			Assert.IsNotNull(result);
			Assert.AreEqual(_model.ValueA, result.ValueA);
			Assert.AreEqual(_model.ValueB, result.ValueB);
		}

		[TestMethod]
		public void ShouldGetNull()
		{
			// arrange
			_sessionKey = "foo";
			_sessionValue = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(_model));
			var session = GetSession();

			// act
			var result = session.GetValue<TestModel>("bar");

			// assert
			Assert.IsNull(result);
		}

		[TestMethod]
		public void ShouldGetValueWithFallback()
		{
			// arrange
			_sessionKey = "test";
			_sessionValue = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(_model));
			var session = GetSession();

			// act
			var result = session.GetValue(_sessionKey, new TestModel());

			// assert
			Assert.IsNotNull(result);
			Assert.AreEqual(_model.ValueA, result.ValueA);
			Assert.AreEqual(_model.ValueB, result.ValueB);
		}

		[TestMethod]
		public void ShouldGetFallback()
		{
			// arrange
			_sessionKey = "foo";
			_sessionValue = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(_model));
			var session = GetSession();

			// act
			var result = session.GetValue("bar", new TestModel());

			// assert
			Assert.IsNotNull(result);
			Assert.AreEqual(null, result.ValueA);
			Assert.AreEqual(null, result.ValueB);
		}

		[TestMethod]
		public void ShouldSetValue()
		{
			// arrange
			string key = "foobar";
			var session = GetSession();

			// act
			session.SetValue(key, _model);

			// arrange
			Assert.AreEqual(key, _sessionKey);
			Assert.AreEqual(JsonConvert.SerializeObject(_model), Encoding.UTF8.GetString(_sessionValue));
		}

		private ISession GetSession()
		{
			string[] keys = [_sessionKey];

			_sessionMock = new Mock<ISession>();
			_sessionMock
				.Setup(s => s.TryGetValue(It.IsAny<string>(), out _sessionValue))
				.Returns<string, byte[]>((key, value) => _sessionKey == key);
			_sessionMock
				.Setup(s => s.Set(It.IsAny<string>(), It.IsAny<byte[]>()))
				.Callback<string, byte[]>((key, value) =>
				{
					_sessionKey = key;
					_sessionValue = value;
				});
			_sessionMock
				.Setup(s => s.Keys)
				.Returns(keys);

			return _sessionMock.Object;
		}
	}
}