using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using WeiSha.Data;

namespace Song.ViewData
{
 /// <summary>
 /// 实体类的扩展
 /// </summary>
 public static class EntityExtensions
 {
 /// <summary>
 /// 实体转为JObject对象
 /// </summary>
 /// <param name="entity"></param>
 /// <returns></returns>
 public static JObject ToJObject(this Entity entity)
 {
 return ToJObject(entity, null, null);
 }
 /// <summary>
 /// 将实体生成为Json对象,每个属性为json的属性
 /// </summary>
 /// <param name="entity"></param>
 /// <param name="only">仅输出指定的属性,用逗号分隔,注意大小写</param>
 /// <param name="wipe">限定不输出的属性,用逗号分隔,注意大小写</param>
 /// <returns></returns>
 public static JObject ToJObject(this Entity entity,string only, string wipe)
 {
 return ToJObject(entity, only, wipe, null);
 }
 /// <summary>
 /// 将实体生成为Json对象,每个属性为json的属性
 /// </summary>
 /// <param name="only">仅输出指定的属性,用逗号分隔,注意大小写</param>
 /// <param name="wipe">限定不输出的属性,用逗号分隔,注意大小写</param>
 /// <param name="addParas">要增加的输出项</param>
 /// <returns></returns>
 public static JObject ToJObject(this Entity entity,string only, string wipe, Dictionary<string, object> addParas)
 {
 string[] onlyArr = null, wipeArr = null;
 if (!string.IsNullOrWhiteSpace(only)) onlyArr = only.Split(',');
 if (!string.IsNullOrWhiteSpace(wipe)) wipeArr = wipe.Split(',');
 //输出字段为json格式
 string str = "{";
 Type info = entity.GetType();
 PropertyInfo[] properties = info.GetProperties();
 for (int j = 0; j < properties.Length; j++)
 {
 PropertyInfo pi = properties[j];
 //当前属性的值
 object value = info.GetProperty(pi.Name).GetValue(entity, null);
 //判断是否输出,是如果没有在指定的输出范围内,则跳过
 if (onlyArr != null && onlyArr.Length > 0 && !_tojson_isExist(pi.Name, onlyArr)) continue;
 //判断是否输出,是如果指定不允许输出,则跳过
 if (wipeArr != null && wipeArr.Length > 0 && _tojson_isExist(pi.Name, wipeArr)) continue;
 //输出属性与对应的值
 var nullableType = Nullable.GetUnderlyingType(pi.PropertyType);
 string typename = nullableType != null ? nullableType.Name : pi.PropertyType.Name;
 str += _tojson_property(typename, pi.Name, value, false) + ",";
 }
 //输出额外增加的项
 if (addParas != null && addParas.Count > 0)
 {
 foreach (KeyValuePair<string, object> e in addParas)
 {
 if (e.Value != null)
 {
 str += _tojson_property(e.Value.GetType().Name, e.Key, e.Value, false) + ",";
 }
 else
 {
 str += _tojson_property("String", e.Key, e.Value, false) + ",";
 }
 }
 }
 if (str.Length > 0 && str.Substring(str.Length - 1, 1) == ",") str = str.Substring(0, str.Length - 1);
 str += "}";
 return JObject.Parse(str);
 }
 /// <summary>
 /// 判断属性是否在数组中
 /// </summary>
 /// <param name="piname">属性名</param>
 /// <param name="arr">数组</param>
 /// <returns></returns>
 private static bool _tojson_isExist(string piname, string[] arr)
 {
 bool isExist = false;
 if (arr != null && arr.Length > 0)
 {
 foreach (string w in arr)
 {
 if (w.Trim() == piname)
 {
 isExist = true;
 break;
 }
 }
 }
 return isExist;
 }
 /// <summary>
 /// 为json输出字段
 /// </summary>
 /// <param name="typename">字段的类型名称</param>
 /// <param name="name">字段的名称</param>
 /// <param name="value">字段的值</param>
 /// <param name="dateeval">时间值是否采用eval方式</param>
 /// <returns></returns>
 private static string _tojson_property(string typename, string name, object value, bool dateeval)
 {
 string str = "\"";
 //根据不同类型输出
 switch (typename)
 {
 case "DateTime":
 System.DateTime time = System.DateTime.Now;
 if (value != null) time = Convert.ToDateTime(value);
 System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
 long timeStamp = (long)(time - startTime).TotalMilliseconds; // 相差毫秒数
 if (dateeval)
 { 
 //将C#时间转换成JS时间字符串 
 string JSstring = string.Format("eval('new ' + eval('/Date({0})/').source)", timeStamp);
 str += name + "\":" + JSstring + "";
 }
 else
 {
 //str += name + "\":\"" + timeStamp + ".0000\"";
 str += name + "\":\"" + time.ToString("yyyy-MM-dd HH:mm:ss") + "\"";
 }
 break;
 case "String":
 str += name + "\":\"" + (value == null ? "" : Microsoft.JScript.GlobalObject.escape(value.ToString())) + "\"";
 break;
 case "Boolean":
 str += name + "\":" + (value == null ? "false" : value.ToString().ToLower());
 break;
 case "Byte":
 case "SByte":
 case "Int16":
 case "UInt16":
 case "Int32":
 case "UInt32":
 case "Single":
 case "Double":
 str += name + "\":" + (value == null ? "0" : value.ToString().ToLower());
 break;
 case "Int64":
 case "UInt64":
 str += name + "\":\"" + value.ToString() + "\"";
 break;
 case "Decimal":
 decimal dec = (decimal)value;
 dec = Math.Round(dec * 100) / 100;
 str += name + "\":\"" + dec.ToString() + "\"";
 break;
 default:
 str += name + "\":\"" + (value == null ? "" : Microsoft.JScript.GlobalObject.escape(value.ToString())) + "\"";
 break;
 }
 return str;
 }
 }
}