using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyWeb
{
    /// <summary>
    /// autoNum 的摘要描述
    /// </summary>
    public class autoNum
    {
        private Model.ezEntities _db = new Model.ezEntities();
        public autoNum()
        {
            //
            // TODO: 在這裡新增建構函式邏輯
            //
        }
        public string createOrderNumber()
        {
            //Application.Lock();
            string order_no = "AA" + DateTime.Now.ToString("yyMMdd");

            var qry = _db.companies.AsQueryable();
            //var prod = qry.Where(q => q.last_order_no.Contains(order_no)).FirstOrDefault();
            var prod = qry.Where(q => q.num == 1).FirstOrDefault();
            if (prod != null)
            {
                if (!string.IsNullOrEmpty(prod.last_order_no) && prod.last_order_no.Contains(order_no))
                {
                    int tmp = Convert.ToInt32(prod.last_order_no.Replace(order_no, "")) + 1;
                    order_no = order_no + tmp.ToString("0000");
                }
                else
                {
                    order_no = order_no + "0001";
                }

                prod.last_order_no = order_no;
                _db.SaveChanges();
            }
            else
                order_no = "";

            //Application.UnLock();

            return order_no;
        }

    }
}