using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using POSV.Entity;
using POSV.Utils;

namespace POSV.Component
{
    public class ProductMerge
    {
        public static List<ProductExt> Merge(int rows , int cols , List<ProductExt> dataSource , bool touchEnabled)
        {
            //启用触摸屏，不分页
            if (touchEnabled)
            {
                return 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;

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

            int offset = 0;

            for (int i = 1; i < pageCount; i++)
            {
                offset += (pageSize - 1);

                ProductExt entity = new ProductExt();
                entity.Id = IdWorkerUtils.Instance.NextId();
                entity.Name = Constant.NEXT_PAGER;
                entity.Memo = (i + 1).ToString();
                dataSource.Insert(offset , entity);

                offset++;

                entity = new ProductExt();
                entity.Id = IdWorkerUtils.Instance.NextId();
                entity.Name = Constant.PREV_PAGER;
                entity.Memo = i.ToString();

                dataSource.Insert(offset , entity);
            }

            return dataSource;
        }
    }
}