// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

#if NET45
using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using Microsoft.AspNet.Http;
using Moq;
using Xunit;

namespace Microsoft.AspNet.Mvc.ModelBinding
{
    public class XmlSerializerInputFormatterTests
    {
        public class DummyClass
        {
            public int SampleInt { get; set; }
        }

        public class TestLevelOne
        {
            public int SampleInt { get; set; }
            public string sampleString;
            public DateTime SampleDate { get; set; }
        }

        public class TestLevelTwo
        {
            public string SampleString { get; set; }
            public TestLevelOne TestOne { get; set; }
        }

        [Fact]
        public void XmlSerializerFormatterHasProperSuppportedMediaTypes()
        {
            // Arrange & Act
            var formatter = new XmlSerializerInputFormatter();

            // Assert
            Assert.True(formatter.SupportedMediaTypes.Contains("application/xml"));
            Assert.True(formatter.SupportedMediaTypes.Contains("text/xml"));
        }

        [Fact]
        public void XmlSerializerFormatterHasProperSuppportedEncodings()
        {
            // Arrange & Act
            var formatter = new XmlSerializerInputFormatter();

            // Assert
            Assert.True(formatter.SupportedEncodings.Any(i => i.WebName == "utf-8"));
            Assert.True(formatter.SupportedEncodings.Any(i => i.WebName == "utf-16"));
        }

        [Fact]
        public async Task XmlSerializerFormatterReadsSimpleTypes()
        {
            // Arrange
            var expectedInt = 10;
            var expectedString = "TestString";
            var expectedDateTime = XmlConvert.ToString(DateTime.UtcNow, XmlDateTimeSerializationMode.Utc);

            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                                "<TestLevelOne><SampleInt>" + expectedInt + "</SampleInt>" +
                                "<sampleString>" + expectedString + "</sampleString>" +
                                "<SampleDate>" + expectedDateTime + "</SampleDate></TestLevelOne>";

            var formatter = new XmlSerializerInputFormatter();
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelOne));

            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            Assert.IsType<TestLevelOne>(context.Model);

            var model = context.Model as TestLevelOne;
            Assert.Equal(expectedInt, model.SampleInt);
            Assert.Equal(expectedString, model.sampleString);
            Assert.Equal(XmlConvert.ToDateTime(expectedDateTime, XmlDateTimeSerializationMode.Utc), model.SampleDate);
        }

        [Fact]
        public async Task XmlSerializerFormatterReadsComplexTypes()
        {
            // Arrange
            var expectedInt = 10;
            var expectedString = "TestString";
            var expectedDateTime = XmlConvert.ToString(DateTime.UtcNow, XmlDateTimeSerializationMode.Utc);
            var expectedLevelTwoString = "102";

            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<TestLevelTwo><SampleString>" + expectedLevelTwoString + "</SampleString>" +
                        "<TestOne><SampleInt>" + expectedInt + "</SampleInt>" +
                        "<sampleString>" + expectedString + "</sampleString>" +
                        "<SampleDate>" + expectedDateTime + "</SampleDate></TestOne></TestLevelTwo>";

            var formatter = new XmlSerializerInputFormatter();
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelTwo));

            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            Assert.IsType<TestLevelTwo>(context.Model);

            var model = context.Model as TestLevelTwo;
            Assert.Equal(expectedLevelTwoString, model.SampleString);
            Assert.Equal(expectedInt, model.TestOne.SampleInt);
            Assert.Equal(expectedString, model.TestOne.sampleString);
            Assert.Equal(XmlConvert.ToDateTime(expectedDateTime, XmlDateTimeSerializationMode.Utc), model.TestOne.SampleDate);
        }

        [Fact]
        public async Task XmlSerializerFormatterReadsWhenMaxDepthIsModified()
        {
            // Arrange
            var expectedInt = 10;

            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                "<DummyClass><SampleInt>" + expectedInt + "</SampleInt></DummyClass>";
            var formatter = new XmlSerializerInputFormatter();
            formatter.MaxDepth = 10;
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(DummyClass));


            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            Assert.IsType<DummyClass>(context.Model);
            var model = context.Model as DummyClass;
            Assert.Equal(expectedInt, model.SampleInt);
        }

        [Fact]
        public async Task XmlSerializerFormatterThrowsOnExceededMaxDepth()
        {
            // Arrange
            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<TestLevelTwo><SampleString>test</SampleString>" +
                        "<TestOne><SampleInt>10</SampleInt>" +
                        "<sampleString>test</sampleString>" +
                        "<SampleDate>" + XmlConvert.ToString(DateTime.UtcNow, XmlDateTimeSerializationMode.Utc)
                        + "</SampleDate></TestOne></TestLevelTwo>";
            var formatter = new XmlSerializerInputFormatter();
            formatter.MaxDepth = 1;
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelTwo));

            // Act & Assert
            await Assert.ThrowsAsync(typeof(InvalidOperationException), async () => await formatter.ReadAsync(context));
        }

        [Fact]
        public async Task XmlSerializerFormatterThrowsWhenReaderQuotasAreChanged()
        {
            // Arrange
            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<TestLevelTwo><SampleString>test</SampleString>" +
                        "<TestOne><SampleInt>10</SampleInt>" +
                        "<sampleString>test</sampleString>" +
                        "<SampleDate>" + XmlConvert.ToString(DateTime.UtcNow, XmlDateTimeSerializationMode.Utc)
                        + "</SampleDate></TestOne></TestLevelTwo>";
            var formatter = new XmlSerializerInputFormatter();
            formatter.XmlDictionaryReaderQuotas.MaxStringContentLength = 10;
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelTwo));

            // Act & Assert
            await Assert.ThrowsAsync(typeof(InvalidOperationException), async () => await formatter.ReadAsync(context));
        }

        [Fact]
        public void XmlSerializerSerializerThrowsWhenMaxDepthIsBelowOne()
        {
            // Arrange
            var formatter = new XmlSerializerInputFormatter();

            // Act & Assert
            Assert.Throws(typeof(ArgumentException), () => formatter.MaxDepth = 0);
        }

        [Fact]
        public async Task VerifyStreamIsOpenAfterRead()
        {
            // Arrange
            var input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                "<DummyClass><SampleInt>10</SampleInt></DummyClass>";
            var formatter = new XmlSerializerInputFormatter();
            var contentBytes = Encoding.UTF8.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(DummyClass));

            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            Assert.True(context.HttpContext.Request.Body.CanRead);
        }

        [Fact]
        public async Task XmlSerializerFormatterThrowsOnInvalidCharacters()
        {
            // Arrange
            var inpStart = Encodings.UTF16EncodingLittleEndian.GetBytes("<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                "<DummyClass><SampleInt>");
            byte[] inp = { 192, 193 };
            var inpEnd = Encodings.UTF16EncodingLittleEndian.GetBytes("</SampleInt></DummyClass>");

            var contentBytes = new byte[inpStart.Length + inp.Length + inpEnd.Length];
            Buffer.BlockCopy(inpStart, 0, contentBytes, 0, inpStart.Length);
            Buffer.BlockCopy(inp, 0, contentBytes, inpStart.Length, inp.Length);
            Buffer.BlockCopy(inpEnd, 0, contentBytes, inpStart.Length + inp.Length, inpEnd.Length);

            var formatter = new XmlSerializerInputFormatter();
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelTwo));

            // Act
            await Assert.ThrowsAsync(typeof(XmlException), async () => await formatter.ReadAsync(context));
        }

        [Fact]
        public async Task XmlSerializerFormatterIgnoresBOMCharacters()
        {
            // Arrange
            var sampleString = "Test";
            var sampleStringBytes = Encoding.UTF8.GetBytes(sampleString);
            var inputStart = Encoding.UTF8.GetBytes("<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + Environment.NewLine +
                "<TestLevelTwo><SampleString>" + sampleString);
            byte[] bom = { 0xef, 0xbb, 0xbf };
            var inputEnd = Encoding.UTF8.GetBytes("</SampleString></TestLevelTwo>");
            var expectedBytes = new byte[sampleString.Length + bom.Length];

            var contentBytes = new byte[inputStart.Length + bom.Length + inputEnd.Length];
            Buffer.BlockCopy(inputStart, 0, contentBytes, 0, inputStart.Length);
            Buffer.BlockCopy(bom, 0, contentBytes, inputStart.Length, bom.Length);
            Buffer.BlockCopy(inputEnd, 0, contentBytes, inputStart.Length + bom.Length, inputEnd.Length);

            var formatter = new XmlSerializerInputFormatter();
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelTwo));

            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            var model = context.Model as TestLevelTwo;
            Buffer.BlockCopy(sampleStringBytes, 0, expectedBytes, 0, sampleStringBytes.Length);
            Buffer.BlockCopy(bom, 0, expectedBytes, sampleStringBytes.Length, bom.Length);
            Assert.Equal(expectedBytes, Encoding.UTF8.GetBytes(model.SampleString));
        }

        [Fact]
        public async Task XmlSerializerFormatterAcceptsUTF16Characters()
        {
            // Arrange
            var expectedInt = 10;
            var expectedString = "TestString";
            var expectedDateTime = XmlConvert.ToString(DateTime.UtcNow, XmlDateTimeSerializationMode.Utc);

            var input = "<?xml version=\"1.0\" encoding=\"UTF-16\"?>" +
                                "<TestLevelOne><SampleInt>" + expectedInt + "</SampleInt>" +
                                "<sampleString>" + expectedString + "</sampleString>" +
                                "<SampleDate>" + expectedDateTime + "</SampleDate></TestLevelOne>";

            var formatter = new XmlSerializerInputFormatter();
            var contentBytes = Encodings.UTF16EncodingLittleEndian.GetBytes(input);
            var context = GetInputFormatterContext(contentBytes, typeof(TestLevelOne));

            // Act
            await formatter.ReadAsync(context);

            // Assert
            Assert.NotNull(context.Model);
            Assert.IsType<TestLevelOne>(context.Model);

            var model = context.Model as TestLevelOne;
            Assert.Equal(expectedInt, model.SampleInt);
            Assert.Equal(expectedString, model.sampleString);
            Assert.Equal(XmlConvert.ToDateTime(expectedDateTime, XmlDateTimeSerializationMode.Utc), model.SampleDate);
        }

        private InputFormatterContext GetInputFormatterContext(byte[] contentBytes, Type modelType)
        {
            var httpContext = GetHttpContext(contentBytes);
            var modelState = new ModelStateDictionary();
            var metadata = new EmptyModelMetadataProvider().GetMetadataForType(null, modelType);
            return new InputFormatterContext(httpContext, metadata, modelState);
        }

        private static HttpContext GetHttpContext(byte[] contentBytes,
                                                        string contentType = "application/xml")
        {
            var request = new Mock<HttpRequest>();
            var headers = new Mock<IHeaderDictionary>();
            headers.SetupGet(h => h["Content-Type"]).Returns(contentType);
            request.SetupGet(r => r.Headers).Returns(headers.Object);
            request.SetupGet(f => f.Body).Returns(new MemoryStream(contentBytes));

            var httpContext = new Mock<HttpContext>();
            httpContext.SetupGet(c => c.Request).Returns(request.Object);
            return httpContext.Object;
        }
    }
}
#endif