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

namespace SlnMesnac.RfidUpload.Common
{
    public class ListPage<T>
    {
        public int TotalPage { get; set; }

        public int Total { get; set; }

        public int PageSize { get; set; } = 50;

        public List<T> Ls { get; set; }

        public ListPage(IEnumerable<T> ls, int pageSize = 500)
        {
            if (!(ls is T[] objArray))
                objArray = ls.ToArray<T>();
            T[] source = objArray;
            this.Ls = ((IEnumerable<T>)source).ToList<T>();
            this.Total = ((IEnumerable<T>)source).Count<T>();
            this.PageSize = pageSize;
            this.TotalPage = (((IEnumerable<T>)source).Count<T>() + this.PageSize - 1) / this.PageSize;
        }

        public IEnumerable<IEnumerable<T>> GetPage()
        {
            List<IEnumerable<T>> page = new List<IEnumerable<T>>();
            for (int index = 0; index < this.TotalPage; ++index)
            {
                IEnumerable<T> objs = this.Ls.Skip<T>(this.PageSize * index).Take<T>(this.PageSize);
                page.Add(objs);
            }
            return (IEnumerable<IEnumerable<T>>)page;
        }
    }
}