using Infragistics.Win.UltraWinGrid;
using System.Data;
using System.Text;

namespace Core.StlMes.Client.Judge.Commons
{
    public class JsonHelper
    {
        public static string ToJson(DataTable dt)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("[");
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append("'");
                    jsonBuilder.Append(dt.Columns[j].ColumnName);
                    jsonBuilder.Append("':'");
                    jsonBuilder.Append(escape(dt.Rows[i][j].ToString()));
                    jsonBuilder.Append("',");
                }
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("]");
            return jsonBuilder.ToString();
        }

        public static string ToJson(DataRow dr)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{");
            for (int j = 0; j < dr.Table.Columns.Count; j++)
            {
                jsonBuilder.Append("\"");
                jsonBuilder.Append(dr.Table.Columns[j].ColumnName);
                jsonBuilder.Append("\":\"");
                jsonBuilder.Append(escape(dr[j].ToString()));
                jsonBuilder.Append("\",");
            }
            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("}");
            return jsonBuilder.ToString();
        }

        public static string ToJson(UltraGridRow row)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{");
            for (int j = 0; j < row.Cells.Count; j++)
            {
                jsonBuilder.Append("\"");
                jsonBuilder.Append(row.Cells[j].Column.Key);
                jsonBuilder.Append("\":\"");
                jsonBuilder.Append(escape(row.Cells[j].Value.ToString()));
                jsonBuilder.Append("\",");
            }
            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("}");
            return jsonBuilder.ToString();
        }

        /// <summary>
        /// json特殊字符转义
        /// </summary>
        /// <param name="json">old json</param>
        /// <returns>new json</returns>
        private static string escape(string json)
        {
            string newJson = "";

            if (!string.IsNullOrEmpty(json))
            {
                newJson = json.Replace("\\", "\\\\").Replace("\r", "\\r").Replace("\n", "\\n").Replace("\"", "\\\"");
            }

            return newJson;
        }

        public static DataTable toTable(string json)
        {
            return Newtonsoft.Json.JsonConvert.DeserializeObject(json, typeof(DataTable)) as DataTable;
        }
    }
}