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

namespace SamplePre.Common.Helper
{
    /// <summary>
    /// XML序列化/反序列化工具类（强类型读取）
    /// </summary>
    public static class XmlSerializerHelper
    {
        /// <summary>
        /// 从XML文件反序列化为指定类型的对象
        /// </summary>
        /// <typeparam name="T">目标实体类型</typeparam>
        /// <param name="filePath">XML文件路径</param>
        /// <returns>实体对象</returns>
        public static T DeserializeFromXml<T>(string filePath) where T : class, new()
        {
            // 检查文件是否存在
            if (!File.Exists(filePath))
            {
                throw new FileNotFoundException("XML配置文件不存在", filePath);
            }

            try
            {
                // 初始化序列化器
                XmlSerializer serializer = new XmlSerializer(typeof(T));
                // 读取文件并反序列化
                using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                {
                    return serializer.Deserialize(fs) as T;
                }
            }
            catch (Exception ex)
            {
                throw new Exception("XML反序列化失败，检查XML格式和实体类是否匹配", ex);
            }
        }

        /// <summary>
        /// 将对象序列化为XML并保存到文件
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="obj">实体对象</param>
        /// <param name="filePath">保存路径</param>
        public static void SerializeToXml<T>(T obj, string filePath) where T : class
        {
            if (obj == null)
            {
                throw new ArgumentNullException(nameof(obj), "序列化对象不能为null");
            }

            try
            {
                XmlSerializer serializer = new XmlSerializer(typeof(T));
                // 写入文件（UTF8编码，避免中文乱码）
                using (StreamWriter sw = new StreamWriter(filePath, false, System.Text.Encoding.UTF8))
                {
                    serializer.Serialize(sw, obj);
                }
            }
            catch (Exception ex)
            {
                throw new Exception("XML序列化失败", ex);
            }
        }
    }
}