// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using Xunit;

namespace Microsoft.AspNetCore.Mvc.ViewFeatures.Internal
{
    public class LifecyclePropertyTest
    {
        [Fact]
        public void GetValue_GetsPropertyValue()
        {
            // Arrange
            var propertyInfo = typeof(TestSubject).GetProperty(nameof(TestSubject.TestProperty));
            var lifecycleProperty = new LifecycleProperty(propertyInfo, "test-key");
            var subject = new TestSubject { TestProperty = "test-value" };

            // Act
            var value = lifecycleProperty.GetValue(subject);

            // Assert
            Assert.Equal("test-value", value);
        }

        [Fact]
        public void SetValue_SetsPropertyValue()
        {
            // Arrange
            var propertyInfo = typeof(TestSubject).GetProperty(nameof(TestSubject.TestProperty));
            var lifecycleProperty = new LifecycleProperty(propertyInfo, "test-key");
            var subject = new TestSubject { TestProperty = "test-value" };

            // Act
            lifecycleProperty.SetValue(subject, "new-value");

            // Assert
            Assert.Equal("new-value", subject.TestProperty);
        }

        [Fact]
        public void SetValue_SetsNullPropertyValue()
        {
            // Arrange
            var propertyInfo = typeof(TestSubject).GetProperty(nameof(TestSubject.TestProperty));
            var lifecycleProperty = new LifecycleProperty(propertyInfo, "test-key");
            var subject = new TestSubject { TestProperty = "test-value" };

            // Act
            lifecycleProperty.SetValue(subject, null);

            // Assert
            Assert.Null(subject.TestProperty);
        }

        [Fact]
        public void SetValue_NoopsIfNullIsBeingAssignedToValueType()
        {
            // Arrange
            var propertyInfo = typeof(TestSubject).GetProperty(nameof(TestSubject.ValueTypeProperty));
            var lifecycleProperty = new LifecycleProperty(propertyInfo, "test-key");
            var subject = new TestSubject { ValueTypeProperty = 42 };

            // Act
            lifecycleProperty.SetValue(subject, null);

            // Assert
            Assert.Equal(42, subject.ValueTypeProperty);
        }

        [Fact]
        public void SetValue_SetsNullValue_ForNullableProperties()
        {
            // Arrange
            var propertyInfo = typeof(TestSubject).GetProperty(nameof(TestSubject.NullableProperty));
            var lifecycleProperty = new LifecycleProperty(propertyInfo, "test-key");
            var subject = new TestSubject { NullableProperty = 42 };

            // Act
            lifecycleProperty.SetValue(subject, null);

            // Assert
            Assert.Null(subject.NullableProperty);
        }

        public class TestSubject
        {
            public string TestProperty { get; set; }

            public int ValueTypeProperty { get; set; }

            public int? NullableProperty { get; set; }
        }
    }
}