using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using Ant.ORM.Table;
using System.Data;


namespace Ant.ORM
{
    public class JsonHelper
    {
        /// <summary>
        /// 是否成功   
        /// </summary>
        public bool Success
        {
            get
            {
                return count > 0;
            }
        }
        private string errorMsg = "";
        /// <summary>
        /// 错误提示信息   
        /// </summary>
        public string ErrorMsg
        {
            get
            {
                return errorMsg;
            }
            set
            {
                errorMsg = value;
            }
        }
        private int count = 0;
        /// <summary>
        /// 总数
        /// </summary>
        public int Count
        {
            get
            {
                return count;
            }
            set
            {
                count = value;
            }
        }
        private List<string> arrData = new List<string>();

        #region 对象与对象之间分割符
        public void addItemOk()
        {
            arrData.Add("<br>");
        }
        #endregion

        #region 在数组里添加key,value
        public void addItem(string name, string value)
        {
            arrData.Add("\"" + name + "\":" + "\"" + value + "\"");
        }
        #endregion

        #region 返回组装好的json字符串
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");
            sb.Append("\"count\":\"" + count + "\",");
            sb.Append("\"error\":\"" + errorMsg + "\",");
            sb.Append("\"success\":\"" + (Success ? "true" : "") + "\",");
            sb.Append("\"data\":[");

            int index = 0;
            sb.Append("{");
            if (arrData.Count <= 0)
            {
                sb.Append("}]");
            }
            else
            {
                foreach (string val in arrData)
                {
                    index++;

                    if (val != "<br>")
                    {
                        sb.Append(val + ",");
                    }
                    else
                    {
                        sb = sb.Replace(",", "", sb.Length - 1, 1);
                        sb.Append("},");
                        if (index < arrData.Count)
                        {
                            sb.Append("{");
                        }
                    }

                }
                sb = sb.Replace(",", "", sb.Length - 1, 1);
                sb.Append("]");
            }

            sb.Append("}");
            return sb.ToString();

        }
        #endregion

        #region 为DataTable增加处理
        /// <summary>
        /// 从数据表中取数据填充,最终可输出json字符串
        /// </summary>
        public void Fill(MDataTable table)
        {
            if (table == null)
            {
                ErrorMsg = "table object is null";
                return;
            }
            Count = table.Rows.Count;
            for (int i = 0; i < table.Rows.Count; i++)
            {
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    addItem(table.Columns[j].ColumnName, Convert.ToString(table.Rows[i][j].Value));
                }
                addItemOk();
            }
        }
        /// <summary>
        /// 从Json字符串中反加载成数据表,默认字段结构都为string类型
        /// </summary>
        public MDataTable Load(string json)
        {
            MDataTable table = new MDataTable("loadFromJson");
            if (!string.IsNullOrEmpty(json) && json.StartsWith("{") && json.IndexOf(',') > -1 && json.EndsWith("}"))
            {
                List<string> items = new List<string>();

                if (json.Contains(":[{"))//多条数据
                {
                    int start = json.IndexOf(":[{") + 2;
                    json = json.Substring(start, json.LastIndexOf("}]") - start);
                    string splitKey = "},{";
                    start = json.IndexOf(splitKey);
                    while (start > -1)
                    {
                        items.Add(json.Substring(0, start + 1));
                        json = json.Remove(0, start + 2);
                        start = json.IndexOf(splitKey);
                    }
                }
                items.Add(json);
                if (items.Count > 0)
                {
                    Dictionary<string, string> keyValueDic = Split(items[0]);
                    if (keyValueDic != null && keyValueDic.Count > 0)
                    {
                        foreach (KeyValuePair<string, string> item in keyValueDic)
                        {
                            table.Columns.Add(item.Key, SqlDbType.NVarChar);
                        }
                    }
                    foreach (string jsonItem in items)
                    {
                        keyValueDic = Split(jsonItem);
                        if (keyValueDic != null && keyValueDic.Count > 0)
                        {
                            MDataRow row = table.NewRow();
                            foreach (KeyValuePair<string, string> item in keyValueDic)
                            {
                                row.Set(item.Key, item.Value);
                            }
                            table.Rows.Add(row);
                        }
                    }
                }

            }
            return table;
        }
        public static Dictionary<string, string> Split(string json)
        {
            if (string.IsNullOrEmpty(json) || !json.StartsWith("{") || !json.EndsWith("}"))
            {
                return null;
            }
            json = json.TrimStart('{').TrimEnd('}');
            List<string> items = new List<string>();
            string splitKey = "\",\"";
            int index = json.IndexOf(splitKey);
            if (index == -1)
            {
                splitKey = "','";
                index = json.IndexOf(splitKey);
                if (index == -1)
                {
                    splitKey = ",";
                    index = json.IndexOf(splitKey);
                }
            }
            int startIndex = 0;
            string item = string.Empty;
            while (index > -1)
            {
                item = json.Substring(0, index + 1);
                if (item.Contains(":"))
                {
                    items.Add(item);
                    json = json.Remove(0, index + 2);
                    startIndex = 0;
                }
                else
                {
                    startIndex = index + 2;
                }
                index = json.IndexOf(splitKey, startIndex);
            }
            items.Add(json);
            Dictionary<string, string> keyValueDic = null;
            if (items.Count > 0)
            {
                keyValueDic = new Dictionary<string, string>();
                foreach (string keyValue in items)
                {
                    index = keyValue.IndexOf(':');
                    if (index > -1)
                    {
                        keyValueDic.Add(keyValue.Substring(0, index).Trim('\'', '\"'), keyValue.Substring(index + 1).Trim('\'', '\"'));
                    }
                }
            }
            return keyValueDic;
        }
        #endregion
    }
}