// 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 System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.Internal;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Routing.Matchers;
using Microsoft.Extensions.Primitives;
using Moq;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.Core.Test.Internal
{
    public class MvcEndpointDataSourceTests
    {
        [Fact]
        public void Endpoints_AccessParameters_InitializedFromProvider()
        {
            // Arrange
            var routeValue = "Value";
            var routeValues = new Dictionary<string, string>
            {
                ["Name"] = routeValue
            };
            var displayName = "DisplayName!";
            var order = 1;
            var template = "/Template!";
            var filterDescriptor = new FilterDescriptor(new ControllerActionFilter(), 1);

            var mockDescriptorProvider = new Mock<IActionDescriptorCollectionProvider>();
            mockDescriptorProvider.Setup(m => m.ActionDescriptors).Returns(new ActionDescriptorCollection(new List<ActionDescriptor>
            {
                new ActionDescriptor
                {
                    RouteValues = routeValues,
                    DisplayName = displayName,
                    AttributeRouteInfo = new AttributeRouteInfo
                    {
                        Order = order,
                        Template = template
                    },
                    FilterDescriptors = new List<FilterDescriptor>
                    {
                        filterDescriptor
                    }
                }
            }, 0));

            // Act
            var dataSource = new MvcEndpointDataSource(
                mockDescriptorProvider.Object,
                new MvcEndpointInvokerFactory(new ActionInvokerFactory(Array.Empty<IActionInvokerProvider>())),
                Array.Empty<IActionDescriptorChangeProvider>());

            // Assert
            var endpoint = Assert.Single(dataSource.Endpoints);
            var matcherEndpoint = Assert.IsType<MatcherEndpoint>(endpoint);

            object endpointValue = matcherEndpoint.Values["Name"];
            Assert.Equal(routeValue, endpointValue);

            Assert.Equal(displayName, matcherEndpoint.DisplayName);
            Assert.Equal(order, matcherEndpoint.Order);
            Assert.Equal(template, matcherEndpoint.Template);
        }

        [Fact]
        public void Endpoints_InvokeReturnedEndpoint_ActionInvokerProviderCalled()
        {
            // Arrange
            var featureCollection = new FeatureCollection();
            featureCollection.Set<IEndpointFeature>(new EndpointFeature
            {
                Values = new RouteValueDictionary()
            });

            var httpContextMock = new Mock<HttpContext>();
            httpContextMock.Setup(m => m.Features).Returns(featureCollection);

            var mockDescriptorProviderMock = new Mock<IActionDescriptorCollectionProvider>();
            mockDescriptorProviderMock.Setup(m => m.ActionDescriptors).Returns(new ActionDescriptorCollection(new List<ActionDescriptor>
            {
                new ActionDescriptor
                {
                    AttributeRouteInfo = new AttributeRouteInfo
                    {
                        Template = string.Empty
                    },
                    FilterDescriptors = new List<FilterDescriptor>()
                }
            }, 0));

            var actionInvokerCalled = false;
            var actionInvokerMock = new Mock<IActionInvoker>();
            actionInvokerMock.Setup(m => m.InvokeAsync()).Returns(() =>
            {
                actionInvokerCalled = true;
                return Task.CompletedTask;
            });

            var actionInvokerProviderMock = new Mock<IActionInvokerFactory>();
            actionInvokerProviderMock.Setup(m => m.CreateInvoker(It.IsAny<ActionContext>())).Returns(actionInvokerMock.Object);

            // Act
            var dataSource = new MvcEndpointDataSource(
                mockDescriptorProviderMock.Object,
                new MvcEndpointInvokerFactory(actionInvokerProviderMock.Object),
                Array.Empty<IActionDescriptorChangeProvider>());

            // Assert
            var endpoint = Assert.Single(dataSource.Endpoints);
            var matcherEndpoint = Assert.IsType<MatcherEndpoint>(endpoint);

            var invokerDelegate = matcherEndpoint.Invoker((next) => Task.CompletedTask);

            invokerDelegate(httpContextMock.Object);

            Assert.True(actionInvokerCalled);
        }

        [Fact]
        public void ChangeToken_MultipleChangeTokenProviders_ComposedResult()
        {
            // Arrange
            var featureCollection = new FeatureCollection();
            featureCollection.Set<IEndpointFeature>(new EndpointFeature
            {
                Values = new RouteValueDictionary()
            });

            var httpContextMock = new Mock<HttpContext>();
            httpContextMock.Setup(m => m.Features).Returns(featureCollection);

            var mockDescriptorProviderMock = new Mock<IActionDescriptorCollectionProvider>();
            mockDescriptorProviderMock.Setup(m => m.ActionDescriptors).Returns(new ActionDescriptorCollection(new List<ActionDescriptor>(), 0));

            var actionInvokerMock = new Mock<IActionInvoker>();

            var actionInvokerProviderMock = new Mock<IActionInvokerFactory>();
            actionInvokerProviderMock.Setup(m => m.CreateInvoker(It.IsAny<ActionContext>())).Returns(actionInvokerMock.Object);

            var changeTokenMock = new Mock<IChangeToken>();

            var changeProvider1Mock = new Mock<IActionDescriptorChangeProvider>();
            changeProvider1Mock.Setup(m => m.GetChangeToken()).Returns(changeTokenMock.Object);
            var changeProvider2Mock = new Mock<IActionDescriptorChangeProvider>();
            changeProvider2Mock.Setup(m => m.GetChangeToken()).Returns(changeTokenMock.Object);

            var dataSource = new MvcEndpointDataSource(
                mockDescriptorProviderMock.Object,
                new MvcEndpointInvokerFactory(actionInvokerProviderMock.Object),
                new[] { changeProvider1Mock.Object, changeProvider2Mock.Object });

            // Act
            var changeToken = dataSource.ChangeToken;

            // Assert
            var compositeChangeToken = Assert.IsType<CompositeChangeToken>(changeToken);
            Assert.Equal(2, compositeChangeToken.ChangeTokens.Count);
        }
    }
}