using System;
using System.IO;
using System.Text;
using System.Xml.Serialization;

namespace SKMC.Api.Common.File
{
    /// <summary>
    /// XML序列化与反序列化工具类
    /// </summary>
    public class XmlSerializerTool
    {
        private static readonly object locker = new object();

        public static T Read<T>(string content) where T : class
        {
            if (String.IsNullOrEmpty(content)) return default;
            StringReader stringReader = new StringReader(content);
            try
            {
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
                return xmlSerializer.Deserialize(stringReader) as T;
            }
            finally
            {
                if (stringReader != null) stringReader.Close();
            }
        }

        public static T ReadFrom<T>(string path) where T : class
        {
            T local = default;
            if (!System.IO.File.Exists(path))
            {
                return local;
            }
            FileStream fileStream = null;
            try
            {
                fileStream = new FileStream(path, FileMode.Open);
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
                return xmlSerializer.Deserialize(fileStream) as T;
            }
            finally
            {
                if (fileStream != null) fileStream.Close();
            }
        }

        public static string Save<T>(T obj) where T : class
        {
            if (obj == null) return null;
            MemoryStream memoryStream = null;
            try
            {
                XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                ns.Add("", "");
                XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
                memoryStream = new MemoryStream();
                xmlSerializer.Serialize(memoryStream, obj, ns);
                return UTF8Encoding.UTF8.GetString(memoryStream.ToArray());
            }
            finally
            {
                if (memoryStream != null) memoryStream.Close();
            }
        }

        public static void SaveTo<T>(string path, T obj)
        {
            object locker = XmlSerializerTool.locker;
            lock (locker)
            {
                FileStream fileStream = null;
                try
                {
                    XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                    ns.Add("", "");
                    XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
                    fileStream = new FileStream(path, FileMode.Create);
                    xmlSerializer.Serialize(fileStream, obj, ns);
                }
                finally
                {
                    if (fileStream != null) fileStream.Close();
                }
            }
        }
    }
}