namespace LaaProductionWeb.Tests.Models
{
    using LaaProductionWeb.API.Models;

    using Microsoft.AspNetCore.Mvc;
    using Microsoft.AspNetCore.Mvc.ModelBinding;

    using NUnit.Framework;

    using System.Linq;
    using System.Reflection;

    public class ModelResultTests
    {
        [Test]
        public void ModelResult_ShouldBeImplicitlyCreated_FromModelStateDictionary()
        {
            // Act
            ModelResult<string> modelResult = default(ModelStateDictionary);

            // Assert
            Assert.IsNotNull(modelResult);
        }

        [Test]
        public void ModelResult_ShouldInitializeModelErrors_WhenCreatedFrom_ModelStateDictionary()
        {
            // Act
            ModelResult<string> modelResult = default(ModelStateDictionary);

            // Assert
            Assert.IsNotNull(modelResult.ModelErrors);
        }

        [Test]
        public void ModelResult_ShouldNotSucceeded_WhenCreatedFrom_ModelStateDictionary()
        {
            // Act
            ModelResult<string> modelResult = default(ModelStateDictionary);

            // Assert
            Assert.IsFalse(modelResult.Succeeded);
        }

        [Test]
        public void ModelResult_ShouldBeImplicitlyCreated_FromOtherObjects()
        {
            // Act
            ModelResult<dynamic> modelResult = default(object);

            // Assert
            Assert.IsNotNull(modelResult);
        }

        [Test]
        public void ModelResult_ShouldSucceeded_WhenCreated_FromOtherObjects()
        {
            // Act
            ModelResult<dynamic> modelResult = default(object);

            // Assert
            Assert.IsTrue(modelResult.Succeeded);
        }

        [Test]
        public void ModelResult_ShouldHaveSameValue_WhenCreated_FromOtherObjects()
        {
            // Arrange
            var value = nameof(ModelResult<dynamic>);
            ModelResult<string> modelResult = value;

            // Act
            var fieldValue = typeof(ModelResult<string>)
                .GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
                .FirstOrDefault(x => x.Name == nameof(value))
                ?.GetValue(modelResult);

            // Assert
            Assert.AreEqual(value, fieldValue);
        }

        [Test]
        public void ModelResult_AddModelError_ShuldNotAddError_WhenKeyIsNull()
        {
            // Arrange
            ModelResult<dynamic> modelResult = default(ModelStateDictionary);
            var modelErrors = modelResult.ModelErrors;

            // Act
            var errorsCountBefore = modelErrors.Count;
            modelResult.AddModelError(null, null);
            var errorsCountAfter = modelErrors.Count;

            // Assert
            Assert.AreEqual(errorsCountBefore, errorsCountAfter);
        }

        [Test]
        public void ModelResult_AddModelError_ShuldAddErrors_WhenKeyIsNotNull()
        {
            // Arrange
            ModelResult<dynamic> modelResult = default(ModelStateDictionary);
            var modelErrors = modelResult.ModelErrors;

            // Act
            var errorsCountBefore = modelErrors.Count;
            modelResult.AddModelError(string.Empty, null);
            var errorsCountAfter = modelErrors.Count;

            // Assert
            Assert.Greater(errorsCountAfter, errorsCountBefore);
        }

        [Test]
        public void ModelResult_AddModelError_ShuldOverrideError_WhenKeyExists()
        {
            // Arrange
            ModelResult<dynamic> modelResult = default(ModelStateDictionary);
            var modelErrors = modelResult.ModelErrors;

            // Act
            modelResult.AddModelError(string.Empty, "1");
            var valueBefore = modelErrors[string.Empty];

            modelResult.AddModelError(string.Empty, "2");
            var valueAfter = modelErrors[string.Empty];

            // Assert
            Assert.AreNotEqual(valueBefore, valueAfter);
        }

        [Test]
        public void ModelResult_ReturnsNotFoundResult_WhenModelResult_IsNull()
        {
            // Arrange
            ModelResult<dynamic> modelResult = null;

            // Act
            ActionResult actionResult = modelResult;

            // Assert
            Assert.AreEqual(actionResult.GetType(), typeof(NotFoundResult));
        }

        [Test]
        public void ModelResult_ReturnsBadRequestObjectResult_WhenCreatedFrom_ModelStateDictionary()
        {
            // Arrange
            ModelResult<dynamic> modelResult = default(ModelStateDictionary);

            // Act
            ActionResult actionResult = modelResult;

            // Assert
            Assert.AreEqual(actionResult.GetType(), typeof(BadRequestObjectResult));
        }

        [Test]
        public void ModelResult_ReturnsOkObjectResult_WhenCreatedWhitValue()
        {
            // Arrange
            ModelResult<dynamic> modelResult = default(string);

            // Act
            ActionResult actionResult = modelResult;

            // Assert
            Assert.AreEqual(actionResult.GetType(), typeof(OkObjectResult));
        }
    }
}