// 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.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.FunctionalTests
{
    // Functional tests for MVC's scenarios with LinkGenerator (2.2+ only)
    public class LinkGeneratorTest : IClassFixture<MvcTestFixture<RoutingWebSite.StartupForLinkGenerator>>
    {
        public LinkGeneratorTest(MvcTestFixture<RoutingWebSite.StartupForLinkGenerator> fixture)
        {
            var factory = fixture.Factories.FirstOrDefault() ?? fixture.WithWebHostBuilder(ConfigureWebHostBuilder);
            Client = factory.CreateDefaultClient();
        }

        private static void ConfigureWebHostBuilder(IWebHostBuilder builder) =>
            builder.UseStartup<RoutingWebSite.StartupForLinkGenerator>();

        public HttpClient Client { get; }
        
        [Fact]
        public async Task GetPathByAction_CanGeneratePathToSelf()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToSelf");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LG1/LinkToSelf", responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathToSelf_PreserveAmbientValues()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToSelf/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LG1/LinkToSelf/17?another-value=5", responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathToAnotherAction_RemovesAmbientValues()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToAnotherAction/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LG1/LinkToSelf?another-value=5", responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathToAnotherController_RemovesAmbientValues()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToAnotherController/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LG2/SomeAction?another-value=5", responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathToAnotherControllerInArea_RemovesAmbientValues()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToAnArea/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/Admin/LG3/SomeAction?another-value=5", responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathWithinArea()
        {
            // Act
            var response = await Client.GetAsync("Admin/LG3/LinkInsideOfArea/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/Admin/LG3/SomeAction", responseContent);
        }

        // Rejected because the calling code relies on ambient values, but doesn't pass
        // the HttpContext.
        [Fact]
        public async Task GetPathByAction_FailsToGenerateLinkInsideArea()
        {
            // Act
            var response = await Client.GetAsync("Admin/LG3/LinkInsideOfAreaFail/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
            Assert.Equal(string.Empty, responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathOutsideOfArea()
        {
            // Act
            var response = await Client.GetAsync("Admin/LG3/LinkOutsideOfArea/17?another-value=5");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
            Assert.Equal(string.Empty, responseContent);
        }

        [Fact]
        public async Task GetPathByAction_CanGeneratePathFromPath()
        {
            // Act
            var response = await Client.GetAsync("LGAnotherPage/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LG2/SomeAction", responseContent);
        }

        [Fact]
        public async Task GetPathByPage_FromPage_CanGeneratePathWithRelativePageName()
        {
            // Act
            var response = await Client.GetAsync("LGPage/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LGAnotherPage", responseContent);
        }

        [Fact]
        public async Task GetPathByPage_CanGeneratePathToPage()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToPage/17?another-value=4");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/LGPage?another-value=4", responseContent);
        }

        [Fact]
        public async Task GetPathByPage_CanGeneratePathToPage_PathTransformed()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToPageWithTransformedPath?id=HelloWorld");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/page-route-transformer/test-page/ExtraPath/HelloWorld", responseContent);
        }

        [Fact]
        public async Task GetPathByPage_CanGeneratePathToPageInArea()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToPageInArea/17?another-value=4");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("/Admin/LGAreaPage?another-value=4&handler=a-handler", responseContent);
        }

        [Fact]
        public async Task GetUriByAction_CanGenerateFullUri()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkWithFullUri/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("http://localhost/LG1/LinkWithFullUri/17#hi", responseContent);
        }

        [Fact]
        public async Task GetUriByAction_CanGenerateFullUri_WithoutHttpContext()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkWithFullUriWithoutHttpContext/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("https://www.example.com/LG1/LinkWithFullUri#hi", responseContent);
        }

        [Fact]
        public async Task GetUriByPage_CanGenerateFullUri()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToPageWithFullUri/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("http://localhost/LGPage", responseContent);
        }

        [Fact]
        public async Task GetUriByPage_CanGenerateFullUri_WithoutHttpContext()
        {
            // Act
            var response = await Client.GetAsync("LG1/LinkToPageWithFullUriWithoutHttpContext/17");
            var responseContent = await response.Content.ReadAsStringAsync();

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("https://www.example.com/Admin/LGAreaPage?handler=a-handler", responseContent);
        }
    }
}