using System;
using System.IO;
using System.Text;
using System.Xml;
using Google.ProtocolBuffers.Serialization;
using Google.ProtocolBuffers.TestProtos;
using NUnit.Framework;

namespace Google.ProtocolBuffers
{
    public class TestWriterFormatXml
    {
        [Test]
        public void Example_FromXml()
        {
            TestXmlMessage.Builder builder = TestXmlMessage.CreateBuilder();

            XmlReader rdr = XmlReader.Create(new StringReader(@"<root><valid>true</valid></root>"));
            //3.5: builder.MergeFromXml(rdr);
            Extensions.MergeFromXml(builder, rdr);

            TestXmlMessage message = builder.Build();
            Assert.AreEqual(true, message.Valid);
        }

        [Test]
        public void Example_ToXml()
        {
            TestXmlMessage message =
                TestXmlMessage.CreateBuilder()
                .SetValid(true)
                .Build();

            //3.5: string Xml = message.ToXml();
            string Xml = Extensions.ToXml(message);

            Assert.AreEqual(@"<root><valid>true</valid></root>", Xml);
        }

        [Test]
        public void Example_WriteXmlUsingICodedOutputStream()
        {
            TestXmlMessage message =
                TestXmlMessage.CreateBuilder()
                .SetValid(true)
                .Build();

            using (TextWriter output = new StringWriter())
            {
                ICodedOutputStream writer = XmlFormatWriter.CreateInstance(output);
                writer.WriteMessageStart();      //manually begin the message, output is '{'

                ICodedOutputStream stream = writer;
                message.WriteTo(stream);         //write the message normally

                writer.WriteMessageEnd();        //manually write the end message '}'
                Assert.AreEqual(@"<root><valid>true</valid></root>", output.ToString());
            }
        }

        [Test]
        public void Example_ReadXmlUsingICodedInputStream()
        {
            TestXmlMessage.Builder builder = TestXmlMessage.CreateBuilder();
            ICodedInputStream reader = XmlFormatReader.CreateInstance(@"<root><valid>true</valid></root>");

            reader.ReadMessageStart();  //manually read the begin the message '{'

            builder.MergeFrom(reader);  //read the message normally

            reader.ReadMessageEnd();    //manually read the end message '}'
        }

        [Test]
        public void TestToXmlParseFromXml()
        {
            TestAllTypes msg = new TestAllTypes.Builder().SetDefaultBool(true).Build();
            string xml = Extensions.ToXml(msg);
            Assert.AreEqual("<root><default_bool>true</default_bool></root>", xml);
            TestAllTypes copy = Extensions.MergeFromXml(new TestAllTypes.Builder(), XmlReader.Create(new StringReader(xml))).Build();
            Assert.IsTrue(copy.HasDefaultBool && copy.DefaultBool);
            Assert.AreEqual(msg, copy);
        }

        [Test]
        public void TestToXmlParseFromXmlWithRootName()
        {
            TestAllTypes msg = new TestAllTypes.Builder().SetDefaultBool(true).Build();
            string xml = Extensions.ToXml(msg, "message");
            Assert.AreEqual("<message><default_bool>true</default_bool></message>", xml);
            TestAllTypes copy = Extensions.MergeFromXml(new TestAllTypes.Builder(), "message", XmlReader.Create(new StringReader(xml))).Build();
            Assert.IsTrue(copy.HasDefaultBool && copy.DefaultBool);
            Assert.AreEqual(msg, copy);
        }

        [Test]
        public void TestEmptyMessage()
        {
            TestXmlChild message = TestXmlChild.CreateBuilder()
                .Build();

            StringWriter sw = new StringWriter();
            XmlWriter xw = XmlWriter.Create(sw);

            //When we call message.WriteTo, we are responsible for the root element
            xw.WriteStartElement("root");
            message.WriteTo(XmlFormatWriter.CreateInstance(xw));
            xw.WriteEndElement();
            xw.Flush();

            string xml = sw.ToString();
            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlChild copy = rdr.Merge(TestXmlChild.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }
        [Test]
        public void TestRepeatedField()
        {
            TestXmlChild message = TestXmlChild.CreateBuilder()
                .AddOptions(EnumOptions.ONE)
                .AddOptions(EnumOptions.TWO)
                .Build();

            //Allow the writer to write the root element
            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();
            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlChild copy = rdr.Merge(TestXmlChild.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestNestedEmptyMessage()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetChild(TestXmlChild.CreateBuilder().Build())
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();
            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestNestedMessage()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetChild(TestXmlChild.CreateBuilder().AddOptions(EnumOptions.TWO).Build())
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();
            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestBooleanTypes()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetValid(true)
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();
            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestFullMessage()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetValid(true)
                .SetText("text")
                .AddTextlines("a")
                .AddTextlines("b")
                .AddTextlines("c")
                .SetNumber(0x1010101010)
                .AddNumbers(1)
                .AddNumbers(2)
                .AddNumbers(3)
                .SetChild(TestXmlChild.CreateBuilder().AddOptions(EnumOptions.ONE).SetBinary(ByteString.CopyFrom(new byte[1])))
                .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.TWO).SetBinary(ByteString.CopyFrom(new byte[2])))
                .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.THREE).SetBinary(ByteString.CopyFrom(new byte[3])))
                .Build();

            StringWriter sw = new StringWriter();
            XmlWriter xwtr = XmlWriter.Create(sw, new XmlWriterSettings {Indent = true, IndentChars = "  "});

            XmlFormatWriter.CreateInstance(xwtr).WriteMessage("root", message);

            string xml = sw.ToString();

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestFullMessageWithRichTypes()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetValid(true)
                .SetText("text")
                .AddTextlines("a")
                .AddTextlines("b")
                .AddTextlines("c")
                .SetNumber(0x1010101010)
                .AddNumbers(1)
                .AddNumbers(2)
                .AddNumbers(3)
                .SetChild(TestXmlChild.CreateBuilder().AddOptions(EnumOptions.ONE).SetBinary(ByteString.CopyFrom(new byte[1])))
                .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.TWO).SetBinary(ByteString.CopyFrom(new byte[2])))
                .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.THREE).SetBinary(ByteString.CopyFrom(new byte[3])))
                .Build();

            StringWriter sw = new StringWriter();
            XmlWriter xwtr = XmlWriter.Create(sw, new XmlWriterSettings { Indent = true, IndentChars = "  " });

            XmlFormatWriter.CreateInstance(xwtr)
                .SetOptions(XmlWriterOptions.OutputNestedArrays | XmlWriterOptions.OutputEnumValues)
                .WriteMessage("root", message);

            string xml = sw.ToString();

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            rdr.Options = XmlReaderOptions.ReadNestedArrays;
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestFullMessageWithUnknownFields()
        {
            TestXmlMessage origial = TestXmlMessage.CreateBuilder()
                    .SetValid(true)
                    .SetText("text")
                    .AddTextlines("a")
                    .AddTextlines("b")
                    .AddTextlines("c")
                    .SetNumber(0x1010101010)
                    .AddNumbers(1)
                    .AddNumbers(2)
                    .AddNumbers(3)
                    .SetChild(TestXmlChild.CreateBuilder().AddOptions(EnumOptions.ONE).SetBinary(ByteString.CopyFrom(new byte[1])))
                    .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.TWO).SetBinary(ByteString.CopyFrom(new byte[2])))
                    .AddChildren(TestXmlMessage.Types.Children.CreateBuilder().AddOptions(EnumOptions.THREE).SetBinary(ByteString.CopyFrom(new byte[3])))
                .Build();
            TestXmlNoFields message = TestXmlNoFields.CreateBuilder().MergeFrom(origial.ToByteArray()).Build();

            Assert.AreEqual(0, message.AllFields.Count);

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw)
                .SetOptions(XmlWriterOptions.OutputNestedArrays | XmlWriterOptions.OutputEnumValues)
                .WriteMessage("root", message);

            string xml = sw.ToString();

            using (XmlReader x = XmlReader.Create(new StringReader(xml)))
            {
                x.MoveToContent();
                Assert.AreEqual(XmlNodeType.Element, x.NodeType);
                //should always be empty
                Assert.IsTrue(x.IsEmptyElement ||
                    (x.Read() && x.NodeType == XmlNodeType.EndElement)
                    );
            }

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            rdr.Options = XmlReaderOptions.ReadNestedArrays;
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(TestXmlMessage.DefaultInstance, copy);
        }

        [Test]
        public void TestMessageWithXmlText()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetText("<text>").Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlWithWhitespace()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetText(" \t <- leading space and trailing -> \r\n\t").Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder()).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlWithExtensionText()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetExtension(UnittestExtrasXmltest.ExtensionText, " extension text value ! ")
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
            UnittestExtrasXmltest.RegisterAllExtensions(registry);

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder(), registry).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlWithExtensionMessage()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetExtension(UnittestExtrasXmltest.ExtensionMessage,
                new TestXmlExtension.Builder().SetNumber(42).Build()).Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
            UnittestExtrasXmltest.RegisterAllExtensions(registry);

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder(), registry).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlWithExtensionArray()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .AddExtension(UnittestExtrasXmltest.ExtensionNumber, 100)
                .AddExtension(UnittestExtrasXmltest.ExtensionNumber, 101)
                .AddExtension(UnittestExtrasXmltest.ExtensionNumber, 102)
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
            UnittestExtrasXmltest.RegisterAllExtensions(registry);

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder(), registry).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlWithExtensionEnum()
        {
            TestXmlMessage message = TestXmlMessage.CreateBuilder()
                .SetExtension(UnittestExtrasXmltest.ExtensionEnum, EnumOptions.ONE)
                .Build();

            StringWriter sw = new StringWriter();
            XmlFormatWriter.CreateInstance(sw).WriteMessage("root", message);

            string xml = sw.ToString();

            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
            UnittestExtrasXmltest.RegisterAllExtensions(registry);

            XmlFormatReader rdr = XmlFormatReader.CreateInstance(xml);
            TestXmlMessage copy = rdr.Merge(TestXmlMessage.CreateBuilder(), registry).Build();
            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestXmlReadEmptyRoot()
        {
            TestXmlMessage.Builder builder = TestXmlMessage.CreateBuilder();
            ICodedInputStream reader = XmlFormatReader.CreateInstance(@"<root/>");

            reader.ReadMessageStart();  //manually read the begin the message '{'

            builder.MergeFrom(reader);  //write the message normally

            reader.ReadMessageEnd();    //manually read the end message '}'
        }

        [Test]
        public void TestXmlReadEmptyChild()
        {
            TestXmlMessage.Builder builder = TestXmlMessage.CreateBuilder();
            ICodedInputStream reader = XmlFormatReader.CreateInstance(@"<root><text /></root>");

            reader.ReadMessageStart();  //manually read the begin the message '{'

            builder.MergeFrom(reader);  //write the message normally
            Assert.IsTrue(builder.HasText);
            Assert.AreEqual(String.Empty, builder.Text);
        }

        [Test]
        public void TestXmlReadWriteWithoutRoot()
        {
            TestXmlMessage.Builder builder = TestXmlMessage.CreateBuilder();
            TestXmlMessage message = builder.SetText("abc").SetNumber(123).Build();

            string xml;
            using (StringWriter sw = new StringWriter())
            {
                ICodedOutputStream output = XmlFormatWriter.CreateInstance(
                    XmlWriter.Create(sw, new XmlWriterSettings() { ConformanceLevel = ConformanceLevel.Fragment }));

                message.WriteTo(output);
                output.Flush();
                xml = sw.ToString();
            }
            Assert.AreEqual("<text>abc</text><number>123</number>", xml);

            TestXmlMessage copy;
            using (XmlReader xr = XmlReader.Create(new StringReader(xml), new XmlReaderSettings() { ConformanceLevel = ConformanceLevel.Fragment }))
            {
                ICodedInputStream input = XmlFormatReader.CreateInstance(xr);
                copy = TestXmlMessage.CreateBuilder().MergeFrom(input).Build();
            }

            Assert.AreEqual(message, copy);
        }

        [Test]
        public void TestRecursiveLimit()
        {
            StringBuilder sb = new StringBuilder(8192);
            for (int i = 0; i < 80; i++)
            {
                sb.Append("<child>");
            }
            Assert.Throws<RecursionLimitExceededException>(() => Extensions.MergeFromXml(new TestXmlRescursive.Builder(), "child", XmlReader.Create(new StringReader(sb.ToString()))).Build());
        }
    }
}