using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.IO;
using System.Data;

namespace QMTask.Core
{
    /// <summary>
    /// XML操作类
    /// </summary>
    public class XmlHelper
    {
        protected string strXmlFile;
        protected XmlDocument objXmlDoc = new XmlDocument();

        public XmlHelper(string XmlFile)
        {
            // 
            // TODO: 在这里加入建构函式的程序代码 
            // 
            try
            {

                objXmlDoc.Load(XmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            strXmlFile = XmlFile;
        }

        /// <summary>
        /// 从XML中获取实体列表
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <returns></returns>
        public List<T> GetData<T>(string XmlPathNode) where T : new()
        {
            try
            {
                DataTable dt = GetData(XmlPathNode);
                if (dt != null)
                {
                    return ConvertToModel<T>(dt);
                }
                else
                {
                    return new List<T>();
                }
            }
            catch
            {
                throw;
            }
        }

        /// <summary>
        /// //查找数据。返回一个DataView 
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <returns></returns>
        public DataTable GetData(string XmlPathNode)
        {
            //查找数据。返回一个DataView 
            DataSet ds = new DataSet();
            StringBuilder str = new StringBuilder();
            str.Append("<root>");
            foreach (XmlNode a in objXmlDoc.SelectNodes(XmlPathNode))
            {
                str.Append(a.OuterXml);
                str.Append("\r\n");
            }
            str.Append("</root>");
            StringReader read = new StringReader(str.ToString());
            ds.ReadXml(read);

            if (ds.Tables.Count == 0)
            {
                return null;
            }
            else
            {
                return ds.Tables[0];
            }
        }
        /// <summary>
        /// 新节点内容。
        /// 示例：xmlTool.Replace("Book/Authors[ISBN=\"0002\"]/Content","ppppppp"); 
        /// </summary>
        /// <param name="XmlPathNode"></param>
        /// <param name="Content"></param>
        public void Replace(string XmlPathNode, string Content)
        {
            //更新节点内容。 
            objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
                        
        }

        /// <summary>
        /// 修改节点属性
        /// </summary>
        /// <param name="Node"></param>
        /// <param name="attrs"></param>
        public void UpdateAttributes(string Node,Dictionary<string, string> attrs)
        {
            if (objXmlDoc.SelectSingleNode(Node) == null)
            {
                return;
            }
            foreach (var a in attrs)
            { 
                    objXmlDoc.SelectSingleNode(Node).Attributes[a.Key].Value = a.Value;
            }
        }

        /// <summary>
        /// 删除一个指定节点的子节点。 
        /// 示例： xmlTool.DeleteChild("Book/Authors[ISBN=\"0003\"]"); 
        /// </summary>
        /// <param name="Node"></param>
        public void DeleteChild(string Node)
        {
            //删除一个节点。 
            string mainNode = Node.Substring(0, Node.LastIndexOf("/"));
            objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
        }



        /// <summary>

        ///  * 使用示列:
        ///  示例： XmlHelper.Delete( "/Node", "")
        ///  XmlHelper.Delete( "/Node", "Attribute")
        /// </summary>
        /// <param name="node">节点</param>
        /// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param>
        public void Delete(string node, string attribute)
        {
            try
            {

                XmlNode xn = objXmlDoc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xn.ParentNode.RemoveChild(xn);
                else
                    xe.RemoveAttribute(attribute);

            }
            catch { }
        }


        /// <summary>
        /// 插入一节点和此节点的一子节点。 
        /// 示例：xmlTool.InsertNode("Book","Author","ISBN","0004"); 
        /// </summary>
        /// <param name="MainNode">主节点</param>
        /// <param name="ChildNode">子节点</param>
        /// <param name="Element">元素</param>
        /// <param name="Content">内容</param>
        public void InsertNode(string MainNode, string ChildNode, string Element, string Content)
        {
            //插入一节点和此节点的一子节点。 
            XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
            objRootNode.AppendChild(objChildNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objChildNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入一个节点，带一属性。
        /// 示例： xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Title","Sex","man","iiiiiiii"); 
        /// </summary>
        /// <param name="MainNode">主节点</param>
        /// <param name="Element">元素</param>
        /// <param name="Attrib">属性</param>
        /// <param name="AttribContent">属性内容</param>
        /// <param name="Content">元素内容</param>
        public void InsertElement(string MainNode, string Element, string Attrib, string AttribContent, string Content)
        {
            //插入一个节点，带一属性。 
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.SetAttribute(Attrib, AttribContent);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }


        /// <summary>
        /// 插入一个节点，带节点列表。
        /// </summary>
        /// <param name="MainNode">主节点</param>
        /// <param name="Element">元素</param>
        /// <param name="Attrib">属性</param>
        /// <param name="AttribContent">属性内容</param>
        /// <param name="Content">元素内容</param>
        public void InsertElement(string MainNode, string Element, Dictionary<string,string> Attribs , string Content)
        {
            //插入一个节点，带一属性。 
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            foreach (var a in Attribs)
            {
                objElement.SetAttribute(a.Key, a.Value);
            }
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 插入一个节点，不带属性。
        /// 示例：xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Content","aaaaaaaaa"); 
        /// </summary>
        /// <param name="MainNode">主节点</param>
        /// <param name="Element">元素</param>
        /// <param name="Content">元素内容</param>
        public void InsertElement(string MainNode, string Element, string Content)
        {
            //插入一个节点，不带属性。 
            XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
            XmlElement objElement = objXmlDoc.CreateElement(Element);
            objElement.InnerText = Content;
            objNode.AppendChild(objElement);
        }

        /// <summary>
        /// 对xml文件做插入，更新，删除后需做Save()操作，以保存修改
        /// </summary>
        public void Save()
        {
            //保存文檔。 
            try
            {
                objXmlDoc.Save(strXmlFile);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            objXmlDoc = null;
        }



        /// <summary>
        /// 将datatable转成实体
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static List<T> ConvertToModel<T>(DataTable dt) where T : new()
        {
            try
            {
                List<T> lists = new List<T>();

                Type type = typeof(T);

                foreach (DataRow dr in dt.Rows)
                {
                    T result = new T();
                    foreach (var item in type.GetProperties())
                    {
                        //object[] attrs = item.GetCustomAttributes(typeof(DBColumnAttribute), true);
                        //if (attrs.Count() == 0)
                        //{
                        //    continue;
                        //}
                        //DBColumnAttribute temp = (DBColumnAttribute)attrs[0];

                        var column = item.Name.ToUpper();

                        if (!dt.Columns.Contains(column))
                        { continue; }

                        var value = dr[column] != null ? dr[column] : null;

                        if (item.PropertyType == typeof(Int32))
                        {
                            int num = 0;
                            try
                            {
                                num = Convert.ToInt32(value);
                            }
                            catch
                            {

                            }
                            item.SetValue(result, num, null);
                        }

                        else if (item.PropertyType == typeof(Int64))
                        {
                            Int64 num = 0;
                            try
                            {
                                num = Convert.ToInt64(value);
                            }
                            catch
                            {

                            }
                            item.SetValue(result, num, null);
                        }

                        else if (item.PropertyType == typeof(decimal))
                        {
                            decimal num = 0;
                            try
                            {
                                num = Convert.ToDecimal(value);
                            }
                            catch
                            {

                            }
                            item.SetValue(result, num, null);
                        }
                        else if (item.PropertyType == typeof(DateTime))
                        {
                            DateTime num = new DateTime();
                            try
                            {
                                num = Convert.ToDateTime(value);
                            }
                            catch
                            {

                            }
                            item.SetValue(result, num, null);
                        }

                        else if (item.PropertyType == typeof(string))
                        {
                            item.SetValue(result, value.ToString(), null);
                        }
                        else if (value == System.DBNull.Value)
                        {
                            item.SetValue(result, "", null);
                        }
                        else
                        {
                            //object value = value == System.DBNull.Value ? null : row[i];
                            item.SetValue(result, value, null);
                        }
                        //item.SetValue(result, value, null);

                    }
                    lists.Add(result);
                }

                return lists;

            }
            catch (Exception ex)
            {

                throw;
            }
        }
    }
}