using System;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Text.RegularExpressions;
namespace DSWeb.SoftMng.XmlHelper
{
    /// <summary>
    /// 实体转Xml，Xml转实体类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class XmlHelper<T> where T : new()
    {
        #region 实体类转成Xml
        /// <summary>
        /// 对象实例转成xml
        /// </summary>
        /// <param name="item">对象实例</param>
        /// <returns></returns>
        public static XmlElement EntityToXml(XmlDocument doc, T item, XmlElement root, ArrayList ignore = null)
        {
            return EntityToXml(doc,root,item, ignore);
        }

        /// <summary>
        /// 对象实例集转成xml
        /// </summary>
        /// <param name="items">对象实例集</param>
        /// <returns></returns>
        public static XmlElement EntityToXml(XmlDocument doc, IList<T> items,string warp, ArrayList ignore = null)
        {
            //创建根元素
            XmlElement root = doc.CreateElement(warp);
            //添加根元素的子元素集
            foreach (T item in items)
            {
                EntityToXml(doc, root, item, ignore);
            }
            //向XmlDocument文档添加根元素
            return root;
        }

        private static XmlElement EntityToXml(XmlDocument doc, XmlElement root, T item, ArrayList ignore)
        {
            //创建元素
            XmlElement xmlItem = doc.CreateElement(typeof(T).Name);
            //对象的属性集
            System.Reflection.PropertyInfo[] propertyInfo =
            typeof(T).GetProperties(System.Reflection.BindingFlags.Public |
            System.Reflection.BindingFlags.Instance);
            foreach (System.Reflection.PropertyInfo pinfo in propertyInfo)
            {
                if (pinfo != null)
                {
                    //对象属性名称
                    string name = pinfo.Name;
                    if (ignore != null)
                    {
                        if (ignore.Contains(name))
                            continue;
                    }
                    if (new Regex(@"\w+_Text|[G|P]ID").IsMatch(name))
                        continue;
                    //对象属性值
                    string value = String.Empty;
                    if (pinfo.GetValue(item, null) != null)
                        value = pinfo.GetValue(item, null).ToString();//获取对象属性值

                    XmlElement elem = doc.CreateElement(name);
                    if ((name == "IEDate" || name == "PDate" || name == "DDate" || name== "BillLadDate" || name== "ProdValidDt" || name== "DespDate" || name== "ValidTime") && !String.IsNullOrEmpty(value))
                        value = Convert.ToDateTime(value).ToString("yyyyMMdd");
                    //if(name == "ProduceDate" && !String.IsNullOrEmpty(value))
                        //value = Convert.ToDateTime(value).ToString("yyyy-MM-dd");
                    if (name == "SignTime" && !String.IsNullOrEmpty(value))
                        value = Convert.ToDateTime(value).ToString("yyyyMMdd HH:mm:ss");
                    if(!String.IsNullOrEmpty(value))
                        elem.InnerText = value;
                    xmlItem.AppendChild(elem);
                }
            }
            //向根添加子元素
            root.AppendChild(xmlItem);
            return xmlItem;
        }
        #endregion

        #region Xml转成实体类

        /// <summary>
        /// Xml转成对象实例
        /// </summary>
        /// <param name="xml">xml</param>
        /// <returns></returns>
        public static T XmlToEntity(string xml)
        {
            IList<T> items = XmlToEntityList(xml);
            if (items != null && items.Count > 0)
                return items[0];
            else return default(T);
        }

        /// <summary>
        /// Xml转成对象实例集
        /// </summary>
        /// <param name="xml">xml</param>
        /// <returns></returns>
        public static IList<T> XmlToEntityList(string xml)
        {
            XmlDocument doc = new XmlDocument();
            try
            {
                doc.LoadXml(xml);
            }
            catch
            {
                return null;
            }
            if (doc.ChildNodes.Count != 1)
                return null;
            if (doc.ChildNodes[0].Name.ToLower() != typeof(T).Name.ToLower() + "s")
                return null;

            XmlNode node = doc.ChildNodes[0];

            IList<T> items = new List<T>();

            foreach (XmlNode child in node.ChildNodes)
            {
                if (child.Name.ToLower() == typeof(T).Name.ToLower())
                    items.Add(XmlNodeToEntity(child));
            }

            return items;
        }

        private static T XmlNodeToEntity(XmlNode node)
        {
            T item = new T();

            if (node.NodeType == XmlNodeType.Element)
            {
                XmlElement element = (XmlElement)node;

                System.Reflection.PropertyInfo[] propertyInfo =
            typeof(T).GetProperties(System.Reflection.BindingFlags.Public |
            System.Reflection.BindingFlags.Instance);

                foreach (XmlAttribute attr in element.Attributes)
                {
                    string attrName = attr.Name.ToLower();
                    string attrValue = attr.Value.ToString();
                    foreach (System.Reflection.PropertyInfo pinfo in propertyInfo)
                    {
                        if (pinfo != null)
                        {
                            string name = pinfo.Name.ToLower();
                            Type dbType = pinfo.PropertyType;
                            if (name == attrName)
                            {
                                if (String.IsNullOrEmpty(attrValue))
                                    continue;
                                switch (dbType.ToString())
                                {
                                    case "System.Int32":
                                        pinfo.SetValue(item, Convert.ToInt32(attrValue), null);
                                        break;
                                    case "System.Boolean":
                                        pinfo.SetValue(item, Convert.ToBoolean(attrValue), null);
                                        break;
                                    case "System.DateTime":
                                        pinfo.SetValue(item, Convert.ToDateTime(attrValue), null);
                                        break;
                                    case "System.Decimal":
                                        pinfo.SetValue(item, Convert.ToDecimal(attrValue), null);
                                        break;
                                    case "System.Double":
                                        pinfo.SetValue(item, Convert.ToDouble(attrValue), null);
                                        break;
                                    default:
                                        pinfo.SetValue(item, attrValue, null);
                                        break;
                                }
                                continue;
                            }
                        }
                    }
                }
            }
            return item;
        }

        #endregion
    }
}