using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Util.Helpers;
using Xunit;
using Xunit.Abstractions;

namespace Util.Tests.Helpers; 

/// <summary>
/// Xml操作测试
/// </summary>
public class XmlTest {
    /// <summary>
    /// 输出工具
    /// </summary>
    private readonly ITestOutputHelper _output;
    /// <summary>
    /// Xml操作
    /// </summary>
    private readonly Xml _xml;

    /// <summary>
    /// 测试初始化
    /// </summary>
    public XmlTest( ITestOutputHelper output ) {
        _output = output;
        _xml = new Xml();
    }

    /// <summary>
    /// 测试添加节点
    /// </summary>
    [Fact]
    public void TestAddNode_1() {
        //结果
        var result = new StringBuilder();
        result.Append( "<xml>" );
        result.Append( "<a>1</a>" );
        result.Append( "</xml>" );

        //操作
        _xml.AddNode( "a", "1" );

        //验证
        Assert.Equal( result.ToString(), _xml.ToString() );

        //输出结果
        _output.WriteLine( _xml.ToString() );
    }

    /// <summary>
    /// 测试添加节点 - 父子节点
    /// </summary>
    [Fact]
    public void TestAddNode_2() {
        //结果
        var result = new StringBuilder();
        result.Append( "<xml>" );
        result.Append( "<a>" );
        result.Append( "<b>2</b>" );
        result.Append( "</a>" );
        result.Append( "</xml>" );

        //操作
        var parent = _xml.AddNode( "a" );
        _xml.AddNode( "b", "2", parent );

        //验证
        Assert.Equal( result.ToString(), _xml.ToString() );

        //输出结果
        _output.WriteLine( _xml.ToString() );
    }

    /// <summary>
    /// 测试添加注释类型节点
    /// </summary>
    [Fact]
    public void TestAddCDataNode_1() {
        //结果
        var result = new StringBuilder();
        result.Append( "<xml>" );
        result.Append( "<![CDATA[1]]>" );
        result.Append( "</xml>" );

        //操作
        _xml.AddCDataNode( "1" );

        //验证
        Assert.Equal( result.ToString(), _xml.ToString() );

        //输出结果
        _output.WriteLine( _xml.ToString() );
    }

    /// <summary>
    /// 测试添加注释类型节点 - 父节点
    /// </summary>
    [Fact]
    public void TestAddCDataNode_2() {
        //结果
        var result = new StringBuilder();
        result.Append( "<xml>" );
        result.Append( "<a>" );
        result.Append( "<![CDATA[1]]>" );
        result.Append( "</a>" );
        result.Append( "</xml>" );

        //操作
        var parent = _xml.AddNode( "a" );
        _xml.AddCDataNode( "1", parent );

        //验证
        Assert.Equal( result.ToString(), _xml.ToString() );

        //输出结果
        _output.WriteLine( _xml.ToString() );
    }

    /// <summary>
    /// 测试添加注释类型节点 - 父节点 - 通过设置字符串父节点名称
    /// </summary>
    [Fact]
    public void TestAddCDataNode_3() {
        //结果
        var result = new StringBuilder();
        result.Append( "<xml>" );
        result.Append( "<a>" );
        result.Append( "<![CDATA[1]]>" );
        result.Append( "</a>" );
        result.Append( "</xml>" );

        //操作
        _xml.AddCDataNode( "1", "a" );

        //验证
        Assert.Equal( result.ToString(), _xml.ToString() );

        //输出结果
        _output.WriteLine( _xml.ToString() );
    }

    /// <summary>
    /// xml字符串转换为XElement列表
    /// </summary>
    [Fact]
    public void TestToElements_1() {
        //输入
        var input = new StringBuilder();
        input.Append( "<xml>" );
        input.Append( "<a>1</a>" );
        input.Append( "<b>2</b>" );
        input.Append( "</xml>" );

        //操作
        var elements = Xml.ToElements( input.ToString() );
        var element = elements.FirstOrDefault( t => t.Name == "b");

        //验证
        Assert.Equal( "2",element?.Value );
    }

    /// <summary>
    /// xml字符串转换为XElement列表
    /// </summary>
    [Fact]
    public void TestToElements_2() {
        //输入
        var input = new StringBuilder();
        input.Append( "<xml>" );
        input.Append( "<a>1</a>" );
        input.Append( "<b>2</b>" );
        input.Append( "<c>" );
        input.Append( "<![CDATA[3]]>" );
        input.Append( "</c>" );
        input.Append( "</xml>" );

        //操作
        var elements = Xml.ToElements( input.ToString() );
        var element = elements.FirstOrDefault( t => t?.Name == "c" );

        //验证
        Assert.Equal( "3", element?.Value );
    }

    /// <summary>
    /// 加载Xml文件到XDocument
    /// </summary>
    [Fact]
    public async Task TestLoadFileToDocumentAsync() {
        var file = Common.GetPhysicalPath( "./Samples/version.xml" );
        var document = await Util.Helpers.Xml.LoadFileToDocumentAsync( file );
        Assert.Equal( "123", document?.Root?.Value );
    }

    /// <summary>
    /// 加载Xml文件到XElement列表
    /// </summary>
    [Fact]
    public async Task TestLoadFileToElementsAsync() {
        var file = Common.GetPhysicalPath( "./Samples/version.xml" );
        var elements = await Util.Helpers.Xml.LoadFileToElementsAsync( file );
        var element = elements.FirstOrDefault( t => t?.Name == "VersionMinor" );
        Assert.Equal( "2", element?.Value );
    }
}