// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.

using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;

namespace System.Web.Mvc.Test
{
    public class ActionDescriptorTest
    {
        [Fact]
        public void ExtractParameterOrDefaultFromDictionary_ReturnsDefaultParameterValueIfMismatch()
        {
            // Arrange
            Dictionary<string, object> dictionary = new Dictionary<string, object>()
            {
                { "stringParameterWithDefaultValue", 42 }
            };

            // Act
            object value = ActionDescriptor.ExtractParameterOrDefaultFromDictionary(ParameterExtractionController.StringParameterWithDefaultValue, dictionary);

            // Assert
            Assert.Equal("hello", value);
        }

        [Fact]
        public void ExtractParameterOrDefaultFromDictionary_ReturnsDefaultTypeValueIfNoMatchAndNoDefaultParameterValue()
        {
            // Arrange
            Dictionary<string, object> dictionary = new Dictionary<string, object>();

            // Act
            object value = ActionDescriptor.ExtractParameterOrDefaultFromDictionary(ParameterExtractionController.IntParameter, dictionary);

            // Assert
            Assert.Equal(0, value);
        }

        [Fact]
        public void ExtractParameterOrDefaultFromDictionary_ReturnsDictionaryValueIfTypeMatch()
        {
            // Arrange
            Dictionary<string, object> dictionary = new Dictionary<string, object>()
            {
                { "stringParameterNoDefaultValue", "someValue" }
            };

            // Act
            object value = ActionDescriptor.ExtractParameterOrDefaultFromDictionary(ParameterExtractionController.StringParameterNoDefaultValue, dictionary);

            // Assert
            Assert.Equal("someValue", value);
        }

        [Fact]
        public void GetCustomAttributesReturnsEmptyArrayOfAttributeType()
        {
            // Arrange
            ActionDescriptor ad = GetActionDescriptor();

            // Act
            ObsoleteAttribute[] attrs = (ObsoleteAttribute[])ad.GetCustomAttributes(typeof(ObsoleteAttribute), true);

            // Assert
            Assert.Empty(attrs);
        }

        [Fact]
        public void GetCustomAttributesThrowsIfAttributeTypeIsNull()
        {
            // Arrange
            ActionDescriptor ad = GetActionDescriptor();

            // Act & assert
            Assert.ThrowsArgumentNull(
                delegate { ad.GetCustomAttributes(null /* attributeType */, true); }, "attributeType");
        }

        [Fact]
        public void GetCustomAttributesWithoutAttributeTypeCallsGetCustomAttributesWithAttributeType()
        {
            // Arrange
            object[] expected = new object[0];
            Mock<ActionDescriptor> mockDescriptor = new Mock<ActionDescriptor>() { CallBase = true };
            mockDescriptor.Setup(d => d.GetCustomAttributes(typeof(object), true)).Returns(expected);
            ActionDescriptor ad = mockDescriptor.Object;

            // Act
            object[] returned = ad.GetCustomAttributes(true /* inherit */);

            // Assert
            Assert.Same(expected, returned);
        }

        [Fact]
        public void GetFilterAttributes_CallsGetCustomAttributes()
        {
            // Arrange
            var mockDescriptor = new Mock<ActionDescriptor>() { CallBase = true };
            mockDescriptor.Setup(d => d.GetCustomAttributes(typeof(FilterAttribute), true)).Returns(new object[] { new Mock<FilterAttribute>().Object }).Verifiable();

            // Act
            var result = mockDescriptor.Object.GetFilterAttributes(true).ToList();

            // Assert
            mockDescriptor.Verify();
            Assert.Single(result);
        }

        [Fact]
        public void GetSelectorsReturnsEmptyCollection()
        {
            // Arrange
            ActionDescriptor ad = GetActionDescriptor();

            // Act
            ICollection<ActionSelector> selectors = ad.GetSelectors();

            // Assert
            Assert.IsType<ActionSelector[]>(selectors);
            Assert.Empty(selectors);
        }

        [Fact]
        public void IsDefinedReturnsFalse()
        {
            // Arrange
            ActionDescriptor ad = GetActionDescriptor();

            // Act
            bool isDefined = ad.IsDefined(typeof(object), true);

            // Assert
            Assert.False(isDefined);
        }

        [Fact]
        public void IsDefinedThrowsIfAttributeTypeIsNull()
        {
            // Arrange
            ActionDescriptor ad = GetActionDescriptor();

            // Act & assert
            Assert.ThrowsArgumentNull(
                delegate { ad.IsDefined(null /* attributeType */, true); }, "attributeType");
        }

        [Fact]
        public void UniqueId_SameTypeControllerDescriptorAndActionName_SameID()
        {
            // Arrange
            var controllerDescriptor = new Mock<ControllerDescriptor>().Object;

            var descriptor1 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor1.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor);
            descriptor1.SetupGet(d => d.ActionName).Returns("Action1");

            var descriptor2 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor2.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor);
            descriptor2.SetupGet(d => d.ActionName).Returns("Action1");

            // Act
            var id1 = descriptor1.Object.UniqueId;
            var id2 = descriptor2.Object.UniqueId;

            // Assert
            Assert.Equal(id1, id2);
        }

        [Fact]
        public void UniqueId_VariesWithActionName()
        {
            // Arrange
            var controllerDescriptor = new Mock<ControllerDescriptor>().Object;

            var descriptor1 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor1.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor);
            descriptor1.SetupGet(d => d.ActionName).Returns("Action1");

            var descriptor2 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor2.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor);
            descriptor2.SetupGet(d => d.ActionName).Returns("Action2");

            // Act
            var id1 = descriptor1.Object.UniqueId;
            var id2 = descriptor2.Object.UniqueId;

            // Assert
            Assert.NotEqual(id1, id2);
        }

        [Fact]
        public void UniqueId_VariesWithControllerDescriptorsUniqueId()
        {
            // Arrange
            var controllerDescriptor1 = new Mock<ControllerDescriptor>();
            controllerDescriptor1.SetupGet(cd => cd.UniqueId).Returns("1");
            var descriptor1 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor1.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor1.Object);
            descriptor1.SetupGet(d => d.ActionName).Returns("Action1");

            var controllerDescriptor2 = new Mock<ControllerDescriptor>();
            controllerDescriptor2.SetupGet(cd => cd.UniqueId).Returns("2");
            var descriptor2 = new Mock<ActionDescriptor> { CallBase = true };
            descriptor2.SetupGet(d => d.ControllerDescriptor).Returns(controllerDescriptor2.Object);
            descriptor2.SetupGet(d => d.ActionName).Returns("Action1");

            // Act
            var id1 = descriptor1.Object.UniqueId;
            var id2 = descriptor2.Object.UniqueId;

            // Assert
            Assert.NotEqual(id1, id2);
        }

        [Fact]
        public void UniqueId_VariesWithActionDescriptorType()
        {
            // Arrange
            var descriptor1 = new BaseDescriptor();
            var descriptor2 = new DerivedDescriptor();

            // Act
            var id1 = descriptor1.UniqueId;
            var id2 = descriptor2.UniqueId;

            // Assert
            Assert.NotEqual(id1, id2);
        }

        class BaseDescriptor : ActionDescriptor
        {
            static ControllerDescriptor controllerDescriptor = new Mock<ControllerDescriptor>().Object;

            public override string ActionName
            {
                get { return "ActionName"; }
            }

            public override ControllerDescriptor ControllerDescriptor
            {
                get { return controllerDescriptor; }
            }

            public override object Execute(ControllerContext controllerContext, IDictionary<string, object> parameters)
            {
                throw new NotImplementedException();
            }

            public override ParameterDescriptor[] GetParameters()
            {
                throw new NotImplementedException();
            }
        }

        class DerivedDescriptor : BaseDescriptor
        {
        }

        private static ActionDescriptor GetActionDescriptor()
        {
            Mock<ActionDescriptor> mockDescriptor = new Mock<ActionDescriptor>() { CallBase = true };
            return mockDescriptor.Object;
        }

        private class ParameterExtractionController : Controller
        {
            public static readonly ParameterInfo IntParameter = typeof(ParameterExtractionController).GetMethod("SomeMethod").GetParameters()[0];
            public static readonly ParameterInfo StringParameterNoDefaultValue = typeof(ParameterExtractionController).GetMethod("SomeMethod").GetParameters()[1];
            public static readonly ParameterInfo StringParameterWithDefaultValue = typeof(ParameterExtractionController).GetMethod("SomeMethod").GetParameters()[2];

            public void SomeMethod(int intParameter, string stringParameterNoDefaultValue, [DefaultValue("hello")] string stringParameterWithDefaultValue)
            {
            }
        }
    }
}
