using System.Collections.Concurrent;
using System.Xml.Serialization;

namespace Tiobon.Core.Common.Helper;

/// <summary>
/// xml序列化帮助类
/// </summary>
public class XmlHelper
{
    /// <summary>
    /// 存储序列类型,防止内存泄漏
    /// </summary>
    private static ConcurrentDictionary<Type, XmlSerializer> hasTypes = new ConcurrentDictionary<Type, XmlSerializer>();
    /// <summary>
    /// 转换对象为JSON格式数据
    /// </summary>
    /// <typeparam name="T">类</typeparam>
    /// <param name="obj">对象</param>
    /// <returns>字符格式的JSON数据</returns>
    public static string GetXML<T>(object obj, string rootName = "root")
    {
        XmlSerializer xs;
        var xsType = typeof(T);
        hasTypes.TryGetValue(xsType, out xs);
        if(xs == null)
        {
            xs = new XmlSerializer(typeof(T));
            hasTypes.TryAdd(xsType, xs);
        }
        using (TextWriter tw = new StringWriter())
        {
            xs.Serialize(tw, obj);
            return tw.ObjToString();
        }
    }

    /// <summary>
    /// Xml格式字符转换为T类型的对象
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="xml"></param>
    /// <returns></returns>
    public static T ParseFormByXml<T>(string xml, string rootName = "root")
    {
        XmlSerializer xs;
        var xsType = typeof(T);
        hasTypes.TryGetValue(xsType, out xs);
        if (xs == null)
        {
            xs = new XmlSerializer(xsType, new XmlRootAttribute(rootName));
            hasTypes.TryAdd(xsType, xs);
        }
        using (StringReader reader = new StringReader(xml))
        {
            return (T)xs.Deserialize(reader);
        }
    }
}
