using Logs;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace cuidian.Sql
{
    public class DataTableUtils
    {
        /// <summary>
        /// 根据列标题获得列名
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="desc"></param>
        /// <returns></returns>
        public static string GetColumnName(DataTable dt, string desc)
        {
            Dictionary<string, string> maps = GetColumnMaps(dt);


            if (maps.ContainsKey(desc)) return maps[desc];

            LogHelper.Debug("未在表中找到列" + desc);
            throw new Exception("未在表中找到列" + desc);
        }

        /// <summary>
        /// 获得列名，列标题映射表
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static Dictionary<string, string> GetColumnMaps(DataTable dt)
        {
            Dictionary<string, string> maps = new Dictionary<string, string>();

            foreach (DataColumn item in dt.Columns)
            {
                maps.Add(item.Caption, item.ColumnName);
            }
            return maps;
        }

        /// <summary>
        /// 获得指定DataTable，指定列的唯一数据
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="col"></param>
        /// <returns></returns>
        public static List<string> GetDistinctValue(DataTable dt, string col)
        {
            List<string> values = new List<string>();

            DataView dataView = dt.DefaultView;

            DataTable dataTableDistinct = dataView.ToTable(true, col);

            dataTableDistinct.Columns[0].ColumnName = "code";

            foreach (DataRow item in dataTableDistinct.Rows)
            {
                values.Add(item[0].ToString());
            }
            return values;
        }

        public static List<string> DataTableToList(DataTable dt)
        {
            return DataTableToList(dt, dt.Columns[0].ColumnName);
        }

        public static List<string> DataTableToList(DataTable dt, string col)
        {
            List<string> values = new List<string>();

            foreach (DataRow dr in dt.Rows)
            {
                values.Add(dr[col].ToString());
            }
            return values;
        }

        public static string GetColData(DataRow dr, string col)
        {
            string data = string.Empty;
            try
            {
                object o = dr[col];

                if (o != null) data = o.ToString();

            }
            catch (Exception ex)
            {
                LogHelper.Debug("获取字段" + col + "失败", ex);
                throw ex;
            }

            return data;
        }

    }
}