// 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 Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.DataAnnotations;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Testing;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Options;
using Moq;
using Xunit;
using Resources = Microsoft.AspNetCore.Mvc.ViewFeatures.Test.Resources;

namespace Microsoft.AspNetCore.Mvc
{
    public class RemoteAttributeBaseTest
    {
        // Null or empty property names are invalid. (Those containing just whitespace are legal.)
        public static TheoryData<string> NullOrEmptyNames
        {
            get
            {
                return new TheoryData<string>
                {
                    null,
                    string.Empty,
                };
            }
        }
        
        [Fact]
        public void IsValidAlwaysReturnsTrue()
        {
            // Arrange
            var attribute = new TestableRemoteAttributeBase();

            // Act & Assert
            Assert.True(attribute.IsValid(value: null));
        }
        
        [Fact]
        public void ErrorMessageProperties_HaveExpectedDefaultValues()
        {
            // Arrange & Act
            var attribute = new TestableRemoteAttributeBase();

            // Assert
            Assert.Null(attribute.ErrorMessage);
            Assert.Null(attribute.ErrorMessageResourceName);
            Assert.Null(attribute.ErrorMessageResourceType);
        }
        
        [Fact]
        [ReplaceCulture]
        public void FormatErrorMessage_ReturnsDefaultErrorMessage()
        {
            // Arrange
            // See ViewFeatures.Resources.RemoteAttribute_RemoteValidationFailed.
            var expected = "'Property1' is invalid.";
            var attribute = new TestableRemoteAttributeBase();

            // Act
            var message = attribute.FormatErrorMessage("Property1");
            
            // Assert
            Assert.Equal(expected, message);
        }
        
        [Fact]
        public void FormatErrorMessage_UsesOverriddenErrorMessage()
        {
            // Arrange
            var expected = "Error about 'Property1' from override.";
            var attribute = new TestableRemoteAttributeBase()
            {
                ErrorMessage = "Error about '{0}' from override.",
            };

            // Act
            var message = attribute.FormatErrorMessage("Property1");

            // Assert
            Assert.Equal(expected, message);
        }
        
        [Fact]
        [ReplaceCulture]
        public void FormatErrorMessage_UsesErrorMessageFromResource()
        {
            // Arrange
            var expected = "Error about 'Property1' from resources.";
            var attribute = new TestableRemoteAttributeBase()
            {
                ErrorMessageResourceName = nameof(Resources.RemoteAttribute_Error),
                ErrorMessageResourceType = typeof(Resources)
            };

            // Act
            var message = attribute.FormatErrorMessage("Property1");

            // Assert
            Assert.Equal(expected, message);
        }
        
        [Theory]
        [MemberData(nameof(NullOrEmptyNames))]
        public void FormatAdditionalFieldsForClientValidation_WithInvalidPropertyName_Throws(string property)
        {
            // Arrange
            var attribute = new TestableRemoteAttributeBase();
            var expectedMessage = "Value cannot be null or empty.";

            // Act & Assert
            ExceptionAssert.ThrowsArgument(
                () => attribute.FormatAdditionalFieldsForClientValidation(property),
                "property",
                expectedMessage);
        }

        [Fact]
        public void FormatAdditionalFieldsForClientValidation_WillFormat_AdditionalFields()
        {
            // Arrange
            var attribute = new TestableRemoteAttributeBase
            {
                AdditionalFields = "FieldOne, FieldTwo"
            };

            // Act
            var actual = attribute.FormatAdditionalFieldsForClientValidation("Property");

            // Assert
            var expected = "*.Property,*.FieldOne,*.FieldTwo";
            Assert.Equal(expected, actual);
        }

        [Theory]
        [MemberData(nameof(NullOrEmptyNames))]
        public void FormatPropertyForClientValidation_WithInvalidPropertyName_Throws(string property)
        {
            // Arrange
            var expected = "Value cannot be null or empty.";

            // Act & Assert
            ExceptionAssert.ThrowsArgument(
                () => RemoteAttributeBase.FormatPropertyForClientValidation(property),
                "property",
                expected);
        }
        
        [Fact]
        public void AddValidation_WithErrorMessage_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from override.";
            var url = "/Controller/Action";
            var context = GetValidationContext();
            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };
            
            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WithErrorMessageAndLocalizerFactory_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from override.";
            var url = "/Controller/Action";
            var localizerFactory = new Mock<IStringLocalizerFactory>(MockBehavior.Strict).Object;
            var context = GetValidationContext(localizerFactory);
            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };
            
            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    // IStringLocalizerFactory existence alone is insufficient to change error message.
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WithErrorMessageAndLocalizerProvider_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from override.";
            var url = "/Controller/Action";
            var context = GetValidationContext();
            var attribute = new TestableRemoteAttributeBase(url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };

            var options = context.ActionContext.HttpContext.RequestServices
                .GetRequiredService<IOptions<MvcDataAnnotationsLocalizationOptions>>();
            var localizer = new Mock<IStringLocalizer>(MockBehavior.Strict);
            options.Value.DataAnnotationLocalizerProvider = (type, factory) => localizer.Object;

            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    // Non-null DataAnnotationLocalizerProvider alone is insufficient to change error message.
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WithErrorMessageLocalizerFactoryAndLocalizerProvider_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from localizer.";
            var url = "/Controller/Action";
            var localizerFactory = new Mock<IStringLocalizerFactory>(MockBehavior.Strict).Object;
            var context = GetValidationContext(localizerFactory);
            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };

            var localizedString = new LocalizedString("Fred", expected);
            var localizer = new Mock<IStringLocalizer>(MockBehavior.Strict);
            localizer
                .Setup(l => l["Error about '{0}' from override.", "Length"])
                .Returns(localizedString)
                .Verifiable();
            var options = context.ActionContext.HttpContext.RequestServices
                .GetRequiredService<IOptions<MvcDataAnnotationsLocalizationOptions>>();
            options.Value.DataAnnotationLocalizerProvider = (type, factory) => localizer.Object;

            // Act
            attribute.AddValidation(context);

            // Assert
            localizer.VerifyAll();

            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        [ReplaceCulture]
        public void AddValidation_WithErrorResourcesLocalizerFactoryAndLocalizerProvider_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from resources.";
            var url = "/Controller/Action";
            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessageResourceName = nameof(Resources.RemoteAttribute_Error),
                ErrorMessageResourceType = typeof(Resources),
            };
            
            var localizerFactory = new Mock<IStringLocalizerFactory>(MockBehavior.Strict).Object;
            var context = GetValidationContext(localizerFactory);

            var localizer = new Mock<IStringLocalizer>(MockBehavior.Strict);
            var options = context.ActionContext.HttpContext.RequestServices
                .GetRequiredService<IOptions<MvcDataAnnotationsLocalizationOptions>>();
            options.Value.DataAnnotationLocalizerProvider = (type, factory) => localizer.Object;

            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    // Configuring the attribute using ErrorMessageResource* trumps available IStringLocalizer etc.
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WithErrorMessageAndDisplayName_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Display Length' from override.";
            var url = "/Controller/Action";

            var metadataProvider = new TestModelMetadataProvider();
            metadataProvider
                .ForProperty(typeof(string), nameof(string.Length))
                .DisplayDetails(d => d.DisplayName = () => "Display Length");
            var context = GetValidationContext(localizerFactory: null, metadataProvider: metadataProvider);

            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };
            
            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WithErrorMessageLocalizerFactoryLocalizerProviderAndDisplayName_SetsAttributesAsExpected()
        {
            // Arrange
            var expected = "Error about 'Length' from localizer.";
            var url = "/Controller/Action";

            var metadataProvider = new TestModelMetadataProvider();
            metadataProvider
                .ForProperty(typeof(string), nameof(string.Length))
                .DisplayDetails(d => d.DisplayName = () => "Display Length");
            var localizerFactory = new Mock<IStringLocalizerFactory>(MockBehavior.Strict).Object;
            var context = GetValidationContext(localizerFactory, metadataProvider);

            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                ErrorMessage = "Error about '{0}' from override.",
            };

            var localizedString = new LocalizedString("Fred", expected);
            var localizer = new Mock<IStringLocalizer>(MockBehavior.Strict);
            localizer
                .Setup(l => l["Error about '{0}' from override.", "Display Length"])
                .Returns(localizedString)
                .Verifiable();
            var options = context.ActionContext.HttpContext.RequestServices
                .GetRequiredService<IOptions<MvcDataAnnotationsLocalizationOptions>>();
            options.Value.DataAnnotationLocalizerProvider = (type, factory) => localizer.Object;

            // Act
            attribute.AddValidation(context);

            // Assert
            localizer.VerifyAll();

            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp =>
                {
                    Assert.Equal("data-val-remote", kvp.Key);
                    Assert.Equal(expected, kvp.Value);
                },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }
        
        [Fact]
        public void AddValidation_WillSetAttributes_ToExpectedValues()
        {
            // Arrange
            var url = "/Controller/Action";
            var attribute = new TestableRemoteAttributeBase(dummyGetUrlReturnValue: url)
            {
                HttpMethod = "POST",
                AdditionalFields = "Password,ConfirmPassword",
                ErrorMessage = "Error"
            };
            var context = GetValidationContext();

            // Act
            attribute.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote", kvp.Key); Assert.Equal("Error", kvp.Value); },
                kvp =>
                {
                    Assert.Equal("data-val-remote-additionalfields", kvp.Key);
                    Assert.Equal("*.Length,*.Password,*.ConfirmPassword", kvp.Value);
                },
                kvp => { Assert.Equal("data-val-remote-type", kvp.Key); Assert.Equal("POST", kvp.Value); },
                kvp => { Assert.Equal("data-val-remote-url", kvp.Key); Assert.Equal(url, kvp.Value); });
        }

        private static ClientModelValidationContext GetValidationContext(
            IStringLocalizerFactory localizerFactory = null,
            IModelMetadataProvider metadataProvider = null)
        {
            var serviceCollection = new ServiceCollection();
            serviceCollection.AddOptions();
            if (localizerFactory != null)
            {
                serviceCollection.AddSingleton<IStringLocalizerFactory>(localizerFactory);
            }

            var serviceProvider = serviceCollection.BuildServiceProvider();
            
            var httpContext = new DefaultHttpContext
            {
                RequestServices = serviceProvider,
            };
            
            var actionContext = new ActionContext(
                httpContext, 
                routeData: new Mock<RouteData>().Object, 
                actionDescriptor: new ActionDescriptor());
            
            var emptyMetadataProvider = new EmptyModelMetadataProvider();

            if (metadataProvider == null)
            {
                metadataProvider = new EmptyModelMetadataProvider();
            }

            var metadata = metadataProvider.GetMetadataForProperty(
                containerType: typeof(string),
                propertyName: nameof(string.Length));

            return new ClientModelValidationContext(
                actionContext,
                metadata,
                metadataProvider,
                new AttributeDictionary());
        }

        private class TestableRemoteAttributeBase : RemoteAttributeBase
        {
            private readonly string _dummyGetUrlReturnValue;

            public TestableRemoteAttributeBase()
            { }
            
            public TestableRemoteAttributeBase(string dummyGetUrlReturnValue)
            {
                _dummyGetUrlReturnValue = dummyGetUrlReturnValue;
            }

            protected override string GetUrl(ClientModelValidationContext context)
            {
                return _dummyGetUrlReturnValue;
            }
        }
    }
}