// 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.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Internal;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Testing;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Internal;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;

namespace Microsoft.AspNetCore.Mvc
{
    public class RedirectToRouteResultTest
    {
        [Theory]
        [MemberData(nameof(RedirectToRouteData))]
        public async Task RedirectToRoute_Execute_PassesCorrectValuesToRedirect(object values)
        {
            // Arrange
            var expectedUrl = "SampleAction";
            var expectedPermanentFlag = false;

            var httpContext = new Mock<HttpContext>();
            httpContext.SetupGet(o => o.RequestServices).Returns(CreateServices().BuildServiceProvider());

            var httpResponse = new Mock<HttpResponse>();
            httpContext.Setup(o => o.Response).Returns(httpResponse.Object);

            var actionContext = new ActionContext(httpContext.Object,
                                                  new RouteData(),
                                                  new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(expectedUrl);
            var result = new RedirectToRouteResult(null, PropertyHelper.ObjectToDictionary(values))
            {
                UrlHelper = urlHelper,
            };

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            // Verifying if Redirect was called with the specific Url and parameter flag.
            // Thus we verify that the Url returned by UrlHelper is passed properly to
            // Redirect method and that the method is called exactly once.
            httpResponse.Verify(r => r.Redirect(expectedUrl, expectedPermanentFlag), Times.Exactly(1));
        }

        [Fact]
        public async Task RedirectToRoute_Execute_ThrowsOnNullUrl()
        {
            // Arrange
            var httpContext = new Mock<HttpContext>();
            httpContext
                .Setup(o => o.Response)
                .Returns(new Mock<HttpResponse>().Object);
            httpContext
                .SetupGet(o => o.RequestServices)
                .Returns(CreateServices().BuildServiceProvider());

            var actionContext = new ActionContext(httpContext.Object, new RouteData(), new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(returnValue: null);
            var result = new RedirectToRouteResult(null, new Dictionary<string, object>())
            {
                UrlHelper = urlHelper,
            };

            // Act & Assert
            await ExceptionAssert.ThrowsAsync<InvalidOperationException>(
                async () =>
                {
                    await result.ExecuteResultAsync(actionContext);
                },
                "No route matches the supplied values.");
        }

        [Fact]
        public async Task ExecuteResultAsync_UsesRouteName_ToGenerateLocationHeader()
        {
            // Arrange
            var routeName = "orders_api";
            var locationUrl = "/api/orders/10";

            var urlHelper = new Mock<IUrlHelper>();
            urlHelper
                .Setup(uh => uh.RouteUrl(It.IsAny<UrlRouteContext>()))
                .Returns(locationUrl)
                .Verifiable();
            var factory = new Mock<IUrlHelperFactory>();
            factory
                .Setup(f => f.GetUrlHelper(It.IsAny<ActionContext>()))
                .Returns(urlHelper.Object);

            var httpContext = GetHttpContext(factory.Object);

            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
            var result = new RedirectToRouteResult(routeName, new { id = 10 });

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            urlHelper.Verify(uh => uh.RouteUrl(
                It.Is<UrlRouteContext>(routeContext => string.Equals(routeName, routeContext.RouteName))));
            Assert.True(httpContext.Response.Headers.ContainsKey("Location"), "Location header not found");
            Assert.Equal(locationUrl, httpContext.Response.Headers["Location"]);
        }

        [Fact]
        public async Task ExecuteResultAsync_WithFragment_PassesCorrectValuesToRedirect()
        {
            // Arrange
            var expectedUrl = "/SampleAction#test";
            var expectedStatusCode = StatusCodes.Status301MovedPermanently;

            var httpContext = GetHttpContext();

            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(expectedUrl);
            var result = new RedirectToRouteResult("Sample", null, true, "test")
            {
                UrlHelper = urlHelper,
            };

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            Assert.Equal(expectedStatusCode, httpContext.Response.StatusCode);
            Assert.Equal(expectedUrl, httpContext.Response.Headers["Location"]);
        }

        [Fact]
        public async Task ExecuteResultAsync_WithFragment_PassesCorrectValuesToRedirect_WithPreserveMethod()
        {
            // Arrange
            var expectedUrl = "/SampleAction#test";
            var expectedStatusCode = StatusCodes.Status308PermanentRedirect;

            var httpContext = GetHttpContext();

            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(expectedUrl);
            var result = new RedirectToRouteResult("Sample", null, true, true, "test")
            {
                UrlHelper = urlHelper,
            };

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            Assert.Equal(expectedStatusCode, httpContext.Response.StatusCode);
            Assert.Equal(expectedUrl, httpContext.Response.Headers["Location"]);
        }

        private static HttpContext GetHttpContext(IUrlHelperFactory factory = null)
        {
            var services = CreateServices(factory);

            var httpContext = new DefaultHttpContext();
            httpContext.RequestServices = services.BuildServiceProvider();

            return httpContext;
        }

        private static IServiceCollection CreateServices(IUrlHelperFactory factory = null)
        {
            var services = new ServiceCollection();
            services.AddSingleton<RedirectToRouteResultExecutor>();

            if (factory != null)
            {
                services.AddSingleton(factory);
            }
            else
            {
                services.AddSingleton<IUrlHelperFactory, UrlHelperFactory>();
            }

            services.AddSingleton<ILoggerFactory>(NullLoggerFactory.Instance);
            return services;
        }

        public static IEnumerable<object[]> RedirectToRouteData
        {
            get
            {
                yield return new object[] { null };
                yield return
                    new object[] {
                        new Dictionary<string, string>() { { "hello", "world" } }
                    };
                yield return
                    new object[] {
                        new RouteValueDictionary(new Dictionary<string, string>() {
                                                        { "test", "case" }, { "sample", "route" } })
                    };
            }
        }

        private static IUrlHelper GetMockUrlHelper(string returnValue)
        {
            var urlHelper = new Mock<IUrlHelper>();
            urlHelper.Setup(o => o.RouteUrl(It.IsAny<UrlRouteContext>())).Returns(returnValue);
            return urlHelper.Object;
        }
    }
}
