using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Models
{
   public enum EnumExpression
    {
        /// <summary>
        /// 相似
        /// </summary>
        like=1,
        /// <summary>
        /// 包含
        /// </summary>
        In=2,

    }
    public class EExpression
    {
        public EExpression(string data, string operation, string checkData)
        {
            this.Data = data;
            this.Operation = operation;
            this.CheckData = checkData;
        }
        public EExpression(string data, string operation, int checkData)
        {
            this.Data = data;
            this.Operation = operation;
            this.CheckData = checkData;
        }
        public EExpression(string data, EnumExpression operation, string checkData)
        {
            this.Data = data;
            this.Operation = operation;
            this.CheckData = checkData;
        }
        public EExpression(string data, EnumExpression operation, List<int> checkData)
        {
            this.Data = data;
            this.Operation = operation;
            this.CheckData = checkData;
        }
        public EExpression(string data, EnumExpression operation, List<string> checkData)
        {
            this.Data = data;
            this.Operation = operation;
            this.CheckData = checkData;
        }
        private Object Data { get; set; }
        private object Operation { get; set; }
        private Object CheckData { get; set; }

        /// <summary>
        /// 返回例子: "2 > 1";
        /// </summary>
        /// <returns></returns>
        public string GetSql()
        {
            string sql = string.Empty;
            if (CheckData.GetType()==typeof(int)&& Operation.GetType() == typeof(string))
            {
                sql= string.Format("{0} {1}{2}", Data, Operation, CheckData);
            }
            else if (CheckData.GetType() == typeof(string)&& Operation.GetType() == typeof(string))
            {
                sql= string.Format("{0} {1}'{2}'", Data, Operation, CheckData);
            }
           else if (Operation.GetType() == typeof(EnumExpression))
            {
                if (((EnumExpression)Operation)==EnumExpression.like)
                {
                    sql = string.Format("{0} like '{1}'", Data, CheckData);
                }
                if (((EnumExpression)Operation) == EnumExpression.In)
                {
                    if (CheckData.GetType()==typeof(List<int>))
                    {
                        var data = CheckData as List<int>;
                        sql = string.Format("{0} in ({1})", Data, string.Join(",", data));
                    }
                    else if (CheckData.GetType() == typeof(List<string>))
                    {
                        List<string> data = CheckData as List<string>;
                        List<string> sqllist = new List<string>();
                        for (int i = 0; i < data.Count; i++)
                        {
                            sqllist.Add("'" + data[i] + "'") ;
                        }
                        sql = string.Format("{0} in ({1}) ", Data, string.Join(",", sqllist));
                    }
                }
            }
           
            return sql;
        }
    }
}