using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;
using System.Collections;
using System.Data.Common;
using System.Web.Script.Serialization;
using System.IO;

namespace Bowin.Common.JSON
{
    public static class ConvertToJson
    {
        #region 私有方法
        /// <summary>
        /// 过滤特殊字符
        /// </summary>
        private static string String2Json(String s)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < s.Length; i++)
            {
                char c = s.ToCharArray()[i];
                switch (c)
                {
                    case '\"':
                        sb.Append("\\\""); break;
                    case '\\':
                        sb.Append("\\\\"); break;
                    case '/':
                        sb.Append("\\/"); break;
                    case '\b':
                        sb.Append("\\b"); break;
                    case '\f':
                        sb.Append("\\f"); break;
                    case '\n':
                        sb.Append("\\n"); break;
                    case '\r':
                        sb.Append("\\r"); break;
                    case '\t':
                        sb.Append("\\t"); break;
                    default:
                        sb.Append(c); break;
                }
            }
            return sb.ToString();
        }
        public static string JsStrFormat(string Str)
        {
            Str = Str.Replace("\"", "＂");
            Str = Str.Replace("'", "＇");

            Str = Str.Replace("[", "［");
            Str = Str.Replace("]", "］");
            Str = Str.Replace("{", "｛");
            Str = Str.Replace("}", "｝");
            Str = Str.Replace("+", "＋");
            Str = Str.Replace("*", "＊");
            //Str = Str.Replace("\","＼");
            //Str = Str.Replace("|", "｜");
            Str = Str.Replace("^", "＾");
            Str = Str.Replace("$", "＄");
            //Str = Str.Replace("?", "？");

            Str = Str.Replace("\r", " ");
            Str = Str.Replace("\n", " ");
            Str = Str.Replace("\t", "   ");
            Str = Str.Replace("\b", "   ");
            Str = Str.Replace("\f", "   ");

            return Str;
        }
        /// <summary>
        /// 格式化字符型、日期型、布尔型
        /// </summary>
        private static string StringFormat(string str, Type type)
        {
            if (type == typeof(string))
            {
                str = String2Json(str);
                str = "\"" + str + "\"";
            }
            else if (type == typeof(DateTime))
            {
                str = "\"" + str + "\"";
            }
            else if (type == typeof(bool))
            {
                str = str.ToLower();
            }
            else if (type != typeof(string) && string.IsNullOrEmpty(str))
            {
                str = "\"" + str + "\"";
            }
            return str;
        }
       
       

        #endregion

        #region List转换成Json
        /// <summary>
        /// List转换成Json
        /// </summary>
        public static string ListToJson<T>(IList<T> list)
        {
            object obj = list[0];
            return ListToJson<T>(list, obj.GetType().Name);
        }

        /// <summary>
        /// List转换成Json 
        /// </summary>
        public static string ListToJson<T>(IList<T> list, string jsonName)
        {
            StringBuilder Json = new StringBuilder();
            if (string.IsNullOrEmpty(jsonName)) jsonName = list[0].GetType().Name;
            Json.Append("{\"" + jsonName + "\":[");
            if (list.Count > 0)
            {
                for (int i = 0; i < list.Count; i++)
                {
                    T obj = Activator.CreateInstance<T>();
                    PropertyInfo[] pi = obj.GetType().GetProperties();
                    Json.Append("{");
                    for (int j = 0; j < pi.Length; j++)
                    {
                        Type type = pi[j].GetValue(list[i], null).GetType();
                        Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));

                        if (j < pi.Length - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < list.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
        #endregion

        #region 对象转换为Json
        /// <summary> 
        /// 对象转换为Json 
        /// </summary> 
        /// <param name="jsonObject">对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(object jsonObject)
        {
            //序列化对象为json数据
            JavaScriptSerializer j = new JavaScriptSerializer();
            return j.Serialize(jsonObject);
        }

        public static string ToJson<T>(this T jsonObject)
        {
            return ToJson((object)jsonObject);
        }
        #endregion

        #region 对象集合转换Json
        /// <summary> 
        /// 对象集合转换Json 
        /// </summary> 
        /// <param name="array">集合对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(IEnumerable array)
        {
            string jsonString = "[";
            foreach (object item in array)
            {
                jsonString += ToJson(item) + ",";
            }
            jsonString = jsonString.Trim(',');
            return jsonString + "]";
        }
        #endregion

        #region 普通集合转换Json
        /// <summary> 
        /// 普通集合转换Json 
        /// </summary> 
        /// <param name="array">集合对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToArrayString(IEnumerable array)
        {
            string jsonString = "[";
            foreach (object item in array)
            {
                jsonString = ToJson(item.ToString()) + ",";
            }
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);
            return jsonString + "]";
        }
        #endregion

        #region  DataSet转换为Json
        /// <summary> 
        /// DataSet转换为Json 
        /// </summary> 
        /// <param name="dataSet">DataSet对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(DataSet dataSet)
        {
            string jsonString = "{";
            foreach (DataTable table in dataSet.Tables)
            {
                jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
            }
            jsonString = jsonString.TrimEnd(',');
            return jsonString + "}";
        }
        #endregion

        #region Datatable转换为Json
        /// <summary> 
        /// Datatable转换为Json 
        /// </summary> 
        /// <param name="table">Datatable对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(DataTable dt)
        {
            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("[");
            DataRowCollection drc = dt.Rows;
            for (int i = 0; i < drc.Count; i++)
            {
                jsonString.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    string strKey = dt.Columns[j].ColumnName;
                    string strValue = drc[i][j].ToString();
                    Type type = dt.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < dt.Columns.Count - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            return jsonString.ToString();
        }

        /// <summary>
        /// DataTable转换为Json 
        /// </summary>
        public static string ToJson(DataTable dt, string jsonName)
        {
            StringBuilder Json = new StringBuilder();
            if (string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName;
            Json.Append("{\"" + jsonName + "\":[");
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    Json.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        Type type = dt.Rows[i][j].GetType();
                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));
                        if (j < dt.Columns.Count - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
        #endregion

        #region DataReader转换为Json
        /// <summary> 
        /// DataReader转换为Json 
        /// </summary> 
        /// <param name="dataReader">DataReader对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(DbDataReader dataReader)
        {
            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("[");
            while (dataReader.Read())
            {
                jsonString.Append("{");
                for (int i = 0; i < dataReader.FieldCount; i++)
                {
                    Type type = dataReader.GetFieldType(i);
                    string strKey = dataReader.GetName(i);
                    string strValue = dataReader[i].ToString();
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (i < dataReader.FieldCount - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append("},");
            }
            dataReader.Close();
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            return jsonString.ToString();
        }
        #endregion

        #region Datatable转换为(不完美)Json ,格式为[ ['A',1],['B',2] ]
        /// <summary> 
        /// Datatable转换为(不完美)Json ,格式为[ ['A',1],['B',2] ]
        /// </summary> 
        /// <param name="table">Datatable对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson2(DataTable dt)
        {
            string json = string.Empty;
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                if (i == 0)
                {
                    json += "[";
                }
                json += "['" + dt.Rows[i][0].ToString() + "'," + dt.Rows[i][1].ToString() + "],";
                if (i == dt.Rows.Count - 1)
                {
                    json = json.Trim(',') + "]";
                }
            }
            return json;
        }
        #endregion

        #region DataTable转换为JS ExtTree
        /// <summary>
        /// Table转换为JS ExtTree
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="pid"></param>
        /// <returns></returns>
        public static string TableToExtTree(DataTable dt, string pid)
        {
            string rtn = "";
            try
            {
                foreach (DataRow dr in dt.Select("pid=" + pid))
                {
                    if (rtn.Length > 0) rtn += ",";
                    string check = "null";
                    string other = "";
                    if (dt.Columns.Contains("Other")) other = dr["Other"].ToString();
                    if (dt.Columns.Contains("checked")) check = dr["checked"].ToString().Trim() == "0" ? "false" : "true";
                    rtn += "{" + string.Format("id:\"{0}\",pid:\"{1}\",Name:\"{2}\",Url:\"{3}\",ImgUrl:\"{4}\",checked:{6},Child:{5},Other:'{7}'",
                        dr["id"].ToString(),
                        dr["pid"].ToString(),
                        JsStrFormat(dr["Name"].ToString()),
                        JsStrFormat(dr["Url"].ToString()),
                        JsStrFormat(dr["ImgUrl"].ToString()),
                        TableToExtTree(dt, dr["id"].ToString()),
                        check,
                        JsStrFormat(other)
                        ) + "}";
                }
            }
            catch { }

            rtn = "[" + rtn + "]";
            return rtn;
        }
        #endregion


    }
}