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

namespace CnasSynchronousCommon
{
    public class CompareObjectOperation
    {
        #region 引用对象比较
        /// <summary>
        /// 引用对象比较
        /// </summary>
        /// <param name="objA"></param>
        /// <param name="objB"></param>
        /// <returns></returns>
        public static bool CompareObject(object objA, object objB)
        {
            bool flag = false;
            if (objA == null || objB == null)
            {
                flag = false;
            }
            else if (objA == DBNull.Value && objB != DBNull.Value)
            {
                flag = false;
            }
            else if (objA != DBNull.Value && objB == DBNull.Value)
            {
                flag = false;
            }
            else if (objA == DBNull.Value && objB == DBNull.Value)
            {
                //objA objB 对应的列类型已经比较过 类型已判断 值一致
                flag = true;
            }
            else if (objA.GetType() != objB.GetType())
            {
                flag = false;
            }
            else if (objA is int || objA is short || objA is long || objA is float || objA is double || objA is decimal)
            {
                //int 01与1      
                if (objA is int)
                {
                    if ((int)objA == (int)objB)
                    {
                        flag = true;
                    }
                }
                else if (objA is short)
                {
                    if ((short)objA == (short)objB)
                    {
                        flag = true;
                    }
                }
                else if (objA is long)
                {
                    if ((long)objA == (long)objB)
                    {
                        flag = true;
                    }
                }
                else if (objA is float)
                {
                    if ((float)objA == (float)objB)
                    {
                        flag = true;
                    }
                }
                else if (objA is double)
                {
                    if ((double)objA == (double)objB)
                    {
                        flag = true;
                    }
                }
                else if (objA is decimal)
                {
                    if ((decimal)objA == (decimal)objB)
                    {
                        flag = true;
                    }
                }
            }
            else
            {
                string strA = ToXMLString(objA);
                string strB = ToXMLString(objB);
                if (strA == strB)
                {
                    flag = true;
                }
            }
            return flag;
        }
        #endregion

        public static string ToXMLString(object entity)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                XmlTextWriter writer = new XmlTextWriter(stream, null);
                XmlSerializer xml = new XmlSerializer(entity.GetType());
                xml.Serialize(writer, entity);
                writer.Formatting = Formatting.Indented;
                using (StreamReader sr = new StreamReader(stream, System.Text.Encoding.UTF8))
                {
                    stream.Position = 0;
                    string xmlString = sr.ReadToEnd();
                    sr.Close();
                    stream.Close();
                    return xmlString;
                }
            }
        }


        /// <summary>
        /// dataRow比较
        /// </summary>
        /// <param name="drA"></param>
        /// <param name="drB"></param>
        /// <param name="columnNames">需要比较的列名称</param>
        /// <returns></returns>
        public static bool DataRowCompare(DataRow drA, DataRow drB, List<string> columnNames)
        {
            bool flag = true;
            //DataRow 中需要比较的列排序
            ColumnSort(drA, columnNames);
            ColumnSort(drB, columnNames);
            foreach (DataColumn dcA in drA.Table.Columns)
            {
                if (columnNames.Contains(dcA.ColumnName)|| columnNames.Contains(dcA.ColumnName.ToUpper())||columnNames.Contains(dcA.ColumnName.ToLower()))
                {
                    foreach (DataColumn dcB in drB.Table.Columns)
                    {
                        if (columnNames.Contains(dcB.ColumnName)|| columnNames.Contains(dcB.ColumnName.ToUpper())||columnNames.Contains(dcB.ColumnName.ToLower()))
                        {
                            if (dcB.ColumnName.ToUpper() == dcA.ColumnName.ToUpper())//列名比较
                            {
                                //类型比较
                                if (dcB.DataType != dcA.DataType)
                                {
                                    flag = false;
                                    break;
                                }
                                //值比较
                                else if (!CompareObject(drA[dcB.ColumnName], drB[dcB.ColumnName]))
                                {
                                    flag = false;
                                    break;
                                }
                            }
                        }
                    }
                }
            }
            return flag;
        }
        /// <summary>
        /// 按照数组中列名顺序排序
        /// </summary>
        /// <param name="drA"></param>
        /// <param name="columnNames">按照数组中列名顺序排序</param>
        public static void ColumnSort(DataRow drA, List<string> columnNames)
        {
            //drA 排序
            int i = 0;
            foreach (string columnName in columnNames)
            {
                if (drA.Table.Columns.Contains(columnName))
                {
                    drA.Table.Columns[columnName].SetOrdinal(i);
                    i++;
                }
            }
        }

    }
}