// 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.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc.Formatters.Xml;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.FunctionalTests
{
    public class SerializableErrorTests : IClassFixture<MvcTestFixture<XmlFormattersWebSite.Startup>>
    {
        public SerializableErrorTests(MvcTestFixture<XmlFormattersWebSite.Startup> fixture)
        {
            Client = fixture.CreateDefaultClient();
        }

        public HttpClient Client { get; }

        public static TheoryData<string> AcceptHeadersData
        {
            get
            {
                return new TheoryData<string>
                {
                    "application/xml-dcs",
                    "application/xml-xmlser"
                };
            }
        }

        [Theory]
        [MemberData(nameof(AcceptHeadersData))]
        public async Task ModelStateErrors_AreSerialized(string acceptHeader)
        {
            // Arrange
            var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost/SerializableError/ModelStateErrors");
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(acceptHeader));
            var expectedXml = "<Error><key1>key1-error</key1><key2>The input was not valid.</key2></Error>";

            // Act
            var response = await Client.SendAsync(request);

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.NotNull(response.Content);
            Assert.NotNull(response.Content.Headers.ContentType);
            Assert.Equal(acceptHeader, response.Content.Headers.ContentType.MediaType);
            var responseData = await response.Content.ReadAsStringAsync();
            XmlAssert.Equal(expectedXml, responseData);
        }

        [Theory]
        [MemberData(nameof(AcceptHeadersData))]
        public async Task PostedSerializableError_IsBound(string acceptHeader)
        {
            // Arrange
            var expectedXml = "<Error><key1>key1-error</key1><key2>The input was not valid.</key2></Error>";
            var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/SerializableError/LogErrors")
            {
                Content = new StringContent(expectedXml, Encoding.UTF8, acceptHeader)
            };
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(acceptHeader));

            // Act
            var response = await Client.SendAsync(request);

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.NotNull(response.Content);
            Assert.NotNull(response.Content.Headers.ContentType);
            Assert.Equal(acceptHeader, response.Content.Headers.ContentType.MediaType);
            var responseData = await response.Content.ReadAsStringAsync();
            XmlAssert.Equal(expectedXml, responseData);
        }

        public static TheoryData<string, string> InvalidInputAndHeadersData
        {
            get
            {
                return new TheoryData<string, string>
                {
                    {
                        "application/xml-dcs",
                        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<Employee xmlns =\"http://schemas.datacontract.org/2004/07/XmlFormattersWebSite.Models\">" +
                        "<Id>2</Id><Name>foo</Name></Employee>"
                    },
                    {
                        "application/xml-xmlser",
                        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<Employee>" +
                        "<Id>2</Id><Name>foo</Name></Employee>"
                    },
                };
            }
        }

        [Theory]
        [MemberData(nameof(InvalidInputAndHeadersData))]
        public async Task IsReturnedInExpectedFormat(string acceptHeader, string inputXml)
        {
            // Arrange
            var expected = "<Error><Id>The field Id must be between 10 and 100.</Id>" +
                "<Name>The field Name must be a string or array type with a minimum " +
                "length of '15'.</Name></Error>";
            var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/SerializableError/CreateEmployee");
            request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse(acceptHeader));
            request.Content = new StringContent(inputXml, Encoding.UTF8, acceptHeader);

            // Act
            var response = await Client.SendAsync(request);

            // Assert
            Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
            var responseData = await response.Content.ReadAsStringAsync();
            XmlAssert.Equal(expected, responseData);
        }

        public static TheoryData<string, string> IncorrectTopLevelInputAndHeadersData
        {
            get
            {
                return new TheoryData<string, string>
                {
                    {
                        "application/xml-dcs",
                        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<Employees xmlns =\"http://schemas.datacontract.org/2004/07/XmlFormattersWebSite.Models\">" +
                        "<Id>2</Id><Name>foo</Name></Employee>"
                    },
                    {
                        "application/xml-xmlser",
                        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<Employees>" +
                        "<Id>2</Id><Name>foo</Name></Employee>"
                    },
                };
            }
        }

        [Theory]
        [MemberData(nameof(IncorrectTopLevelInputAndHeadersData))]
        public async Task IncorrectTopLevelElement_ReturnsExpectedError(string acceptHeader, string inputXml)
        {
            // Arrange
            var expected = "<Error><MVC-Empty>An error occurred while deserializing input data.</MVC-Empty></Error>";
            var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/SerializableError/CreateEmployee");
            request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse(acceptHeader));
            request.Content = new StringContent(inputXml, Encoding.UTF8, acceptHeader);

            // Act
            var response = await Client.SendAsync(request);

            // Assert
            Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
            var responseData = await response.Content.ReadAsStringAsync();
            XmlAssert.Equal(expected, responseData);
        }
    }
}
