using POSV.Entity;
using POSV.Entity.Stock;
using POSV.Entity.WeiXinDc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace POSV.Component
{
    public class ProductSelectMerge
    {
        public static List<FoodMaterialDetailEntity> Merge(int rows, int cols, List<FoodMaterialDetailEntity> dataSource)
        {
            //移除可能存在的分页标识
            dataSource.RemoveAll(x => Constant.PREV_PAGER.Equals(x.ProductName) || Constant.NEXT_PAGER.Equals(x.ProductName));

            int pageSize = rows * cols;
            int totalCount = dataSource.Count;

            int pageCount = ((totalCount - 1) + (pageSize - 2) - 1) / (pageSize - 2);

            int offset = 0;
            int i = 1;
            for (; i < pageCount; i++)
            {
                offset += (pageSize - 1);
                if (i == 1)
                {
                    //第一页，最后一位加下一页
                    FoodMaterialDetailEntity entity = new FoodMaterialDetailEntity();
                    entity.ProductName = Constant.NEXT_PAGER;
                    entity.Memo = (i + 1).ToString();
                    dataSource.Insert(offset, entity);
                }
                else
                {
                    //中间页，最后加前后
                    var entity = new FoodMaterialDetailEntity();
                    entity.ProductName = Constant.PREV_PAGER;
                    entity.Memo = (i - 1).ToString();
                    dataSource.Insert(offset - 1, entity);

                    entity = new FoodMaterialDetailEntity();
                    entity.ProductName = Constant.NEXT_PAGER;
                    entity.Memo = (i + 1).ToString();
                    dataSource.Insert(offset, entity);

                }
                offset++;
            }
            if(pageCount > 1)
            {
                //最后一页，最后一位加上一页
                var entity = new FoodMaterialDetailEntity();
                entity.ProductName = Constant.PREV_PAGER;
                entity.Memo = (i - 1).ToString();
                dataSource.Add(entity);
            }

            return dataSource;
        }


        public static List<WxdcGoodsEntity> MergeWxdc(int rows, int cols, List<WxdcGoodsEntity> dataSource)
        {
            //移除可能存在的分页标识
            dataSource.RemoveAll(x => Constant.PREV_PAGER.Equals(x.Name) || Constant.NEXT_PAGER.Equals(x.Name));

            int pageSize = rows * cols;
            int totalCount = dataSource.Count;

            int pageCount = ((totalCount - 1) + (pageSize - 2) - 1) / (pageSize - 2);

            int offset = 0;
            int i = 1;
            for (; i < pageCount; i++)
            {
                offset += (pageSize - 1);
                if (i == 1)
                {
                    //第一页，最后一位加下一页
                    WxdcGoodsEntity entity = new WxdcGoodsEntity();
                    entity.Name = Constant.NEXT_PAGER;
                    entity.Description = (i + 1).ToString();
                    dataSource.Insert(offset, entity);
                }
                else
                {
                    //中间页，最后加前后
                    var entity = new WxdcGoodsEntity();
                    entity.Name = Constant.PREV_PAGER;
                    entity.Description = (i - 1).ToString();
                    dataSource.Insert(offset - 1, entity);

                    entity = new WxdcGoodsEntity();
                    entity.Name = Constant.NEXT_PAGER;
                    entity.Description = (i + 1).ToString();
                    dataSource.Insert(offset, entity);

                }
                offset++;
            }
            if (pageCount > 1)
            {
                //最后一页，最后一位加上一页
                var entity = new WxdcGoodsEntity();
                entity.Name = Constant.PREV_PAGER;
                entity.Description = (i - 1).ToString();
                dataSource.Add(entity);
            }

            return dataSource;
        }
    }
}