using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Serialization;

namespace Shentun.Peis.PlugIns.Extensions
{
    public class XmlHelper
    {
        public static string SerializeToXml<T>(T obj)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(T));
            using (StringWriter textWriter = new StringWriter())
            {
                serializer.Serialize(textWriter, obj);
                return textWriter.ToString();
            }
        }

        public static T DeserializeXml<T>(string xml)
        {
            var serializer = new XmlSerializer(typeof(T));
            using var reader = new StringReader(xml);
            return (T)serializer.Deserialize(reader);
        }

        public static T DeserializeXmlAddRoot<T>(string xml)
        {
            // 创建 XmlDocument 来修复 XML
            var xmlDoc = new XmlDocument();

            // 添加根元素
            var root = xmlDoc.CreateElement("root");

            // 加载原始内容到根元素中
            root.InnerXml = xml;
            xmlDoc.AppendChild(root);

            // 转换为字符串
            string fixedXml = xmlDoc.OuterXml;
            var serializer = new XmlSerializer(typeof(T));
            using var reader = new StringReader(fixedXml);
            return (T)serializer.Deserialize(reader);
        }

        public static string SerializeToXmlEmpty<T>(T obj)
        {
            if (obj == null)
                throw new ArgumentNullException(nameof(obj));

            XmlSerializer serializer = new XmlSerializer(typeof(T));
            XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
            namespaces.Add("", "");

            // 使用不带 BOM 的 UTF-8 编码
            var utf8NoBom = new UTF8Encoding(false); // false 表示不包含 BOM

            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (StreamWriter streamWriter = new StreamWriter(memoryStream, utf8NoBom))
                {
                    serializer.Serialize(streamWriter, obj, namespaces);
                }

                string xml = utf8NoBom.GetString(memoryStream.ToArray());

                // 使用正则表达式替换所有自闭合标签
                System.Text.RegularExpressions.Regex regex =
                    new System.Text.RegularExpressions.Regex(@"<(\w+)\s*/>");

                xml = regex.Replace(xml, @"<$1></$1>");

                return xml;
            }
        }
    }
}