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

namespace CraneTool
{
	public static class XmlHelper
	{
		private static void XmlSerializeInternal(Stream stream, object o, Encoding encoding)
		{
			if (o == null)
				throw new ArgumentNullException("o");
			if (encoding == null)
				throw new ArgumentNullException("encoding");

			XmlSerializer serializer = new XmlSerializer(o.GetType());

			XmlWriterSettings settings = new XmlWriterSettings();
			settings.Indent = true;
			settings.NewLineChars = "\r\n";
			settings.Encoding = encoding;
			settings.IndentChars = "    ";

			using (XmlWriter writer = XmlWriter.Create(stream, settings))
			{
				serializer.Serialize(writer, o);
				writer.Close();
			}
		}

		/// <summary>
		/// 将一个对象序列化为XML字符串
		/// </summary>
		/// <param name="o">要序列化的对象</param>
		/// <param name="encoding">编码方式</param>
		/// <returns>序列化产生的XML字符串</returns>
		public static string XmlSerialize(object o, Encoding encoding)
		{
			using (MemoryStream stream = new MemoryStream())
			{
				XmlSerializeInternal(stream, o, encoding);

				stream.Position = 0;
				using (StreamReader reader = new StreamReader(stream, encoding))
				{
					return reader.ReadToEnd();
				}
			}
		}

		/// <summary>
		/// 将一个对象按XML序列化的方式写入到一个文件
		/// </summary>
		/// <param name="o">要序列化的对象</param>
		/// <param name="path">保存文件路径</param>
		/// <param name="encoding">编码方式</param>
		public static void XmlSerializeToFile(object o, string path, Encoding encoding)
		{
			if (string.IsNullOrEmpty(path))
				throw new ArgumentNullException("path");

			using (FileStream file = new FileStream(path, FileMode.Create, FileAccess.Write))
			{
				XmlSerializeInternal(file, o, encoding);
			}
		}

		/// <summary>
		/// 从XML字符串中反序列化对象
		/// </summary>
		/// <typeparam name="T">结果对象类型</typeparam>
		/// <param name="s">包含对象的XML字符串</param>
		/// <param name="encoding">编码方式</param>
		/// <returns>反序列化得到的对象</returns>
		public static T XmlDeserialize<T>(string s, Encoding encoding)
		{
			if (string.IsNullOrEmpty(s))
				throw new ArgumentNullException("s");
			if (encoding == null)
				throw new ArgumentNullException("encoding");

			XmlSerializer mySerializer = new XmlSerializer(typeof(T));
			using (MemoryStream ms = new MemoryStream(encoding.GetBytes(s)))
			{
				using (StreamReader sr = new StreamReader(ms, encoding))
				{
					return (T)mySerializer.Deserialize(sr);
				}
			}
		}

		/// <summary>
		/// 读入一个文件，并按XML的方式反序列化对象。
		/// </summary>
		/// <typeparam name="T">结果对象类型</typeparam>
		/// <param name="path">文件路径</param>
		/// <param name="encoding">编码方式</param>
		/// <returns>反序列化得到的对象</returns>
		public static T XmlDeserializeFromFile<T>(string path, Encoding encoding)
		{
			if (string.IsNullOrEmpty(path))
				throw new ArgumentNullException("path");
			if (encoding == null)
				throw new ArgumentNullException("encoding");

			string xml = File.ReadAllText(path, encoding);
			return XmlDeserialize<T>(xml, encoding);
		}
	}
}
