using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;


namespace Original.Common
{
    /// <summary>
    /// 将数据转换成easyui控件支持的数据格式
    /// </summary>
    public static class JsonHelper
    {
        /// <summary>
        /// 将DataTable转换成Combobox支持的数据格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="valueField">id字段名称</param>
        /// <param name="textField">text字段名称</param>
        /// <returns>json</returns>
        public static string DataTableToCombobox(DataTable dt, string valueField, string textField)
        {
            List<Combobox> lst = new List<Combobox>();
            foreach (DataRow row in dt.Rows)
            {
                if (row[valueField] == DBNull.Value || row[textField] == DBNull.Value)
                {
                    continue;
                }
                lst.Add(new Combobox() { id = row[valueField].ToString(), text = row[textField].ToString() });
            }
            string json = JsonConvert.SerializeObject(lst);
            return json;
        }

        /// <summary>
        /// 将实体转换成json
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="t">实体实例</param>
        /// <returns>json</returns>
        public static string ModelToJson<T>(T t)
        {
            string json = JsonConvert.SerializeObject(t);
            return json;
        }
        /// <summary>
        /// DataTable转换成DataGrid数据格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="iRecordCount">数据总记录数</param>
        /// <returns>json</returns>
        public static string DataTableToDataGrid(DataTable dt, int iRecordCount)
        {
            DataGrid dg = new DataGrid();
            dg.total = iRecordCount.ToString();
            dg.rows = dt;
            string dtJson = JsonConvert.SerializeObject(dg, new JsonConverter[] { new DataTableConverter() });
            return dtJson;
        }
        /// <summary>
        /// DataTable转换成Combotree数据格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="parentValue">一级节点的父ID值</param>
        /// <param name="idField">id字段名称</param>
        /// <param name="parentField">父字段名称</param>
        /// <param name="textField">显示值的字段名称</param>
        /// <returns>json</returns>
        public static string DataTableToCombotree(DataTable dt, string parentValue, string idField, string parentField, string textField)
        {
            List<Combotree> lstCombotree = new List<Combotree>();
            BindTree(dt, null, parentValue, lstCombotree, idField, parentField, textField);
            string dtJson = JsonConvert.SerializeObject(lstCombotree);
            return dtJson;
        }

        #region 辅助方法
        /// <summary>
        /// 构造Combotree结构数据
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="parentNode">父结点</param>
        /// <param name="parentID">一级节点的父ID</param>
        /// <param name="ListCombotree">Combotree空列表</param>
        private static void BindTree(DataTable dtSource, Combotree parentNode, string parentID, List<Combotree> ListCombotree, string idField, string parentField, string textField)
        {
            DataRow[] rows = dtSource.Select(string.Format("{0}=‘{1}‘", parentField, parentID));
            foreach (DataRow row in rows)
            {
                if (row[idField] == DBNull.Value || row[textField] == DBNull.Value)
                {
                    continue;
                }
                Combotree node = new Combotree();
                node.text = row[textField].ToString();
                node.id = row[idField].ToString();
                BindTree(dtSource, node, row[idField].ToString(), ListCombotree, idField, parentField, textField);
                if (parentNode == null) //(row[arg.parentid].ToString() == "-1")
                {
                    // 一级数据
                    ListCombotree.Add(node);
                }
                else
                {
                    // 子级数据
                    parentNode.children.Add(node);
                }
            }
        }
        #endregion
    }
    #region easyui 控件结构
    /// <summary>
    /// Combobox
    /// </summary>
    [Serializable]
    public class Combobox
    {
        /// <summary>
        /// 值
        /// </summary>
        public string id { get; set; }

        /// <summary>
        /// 显示的名称
        /// </summary>
        public string text { get; set; }
    }

    /// <summary>
    /// Combobox
    /// </summary>
    [Serializable]
    public class Combotree
    {
        /// <summary>
        /// value的值
        /// </summary>
        public string id { get; set; }

        /// <summary>
        /// text显示的值
        /// </summary>
        public string text { get; set; }

        /// <summary>
        /// 子列表
        /// </summary>
        public List<Combotree> children { get; set; }
    }

    /// <summary>
    /// DataGrid
    /// </summary>
    [Serializable]
    public class DataGrid
    {
        /// <summary>
        /// 数据总记录
        /// </summary>
        public string total { get; set; }

        /// <summary>
        /// 数据源DataTable
        /// </summary>
        public DataTable rows { get; set; }
    }
    #endregion
}