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

namespace NerdDinner.Helpers { 

    public class PaginatedList<T> : List<T> {

        public int PageIndex  { get; private set; }
        public int PageSize   { get; private set; }
        public int TotalCount { get; private set; }
        public int TotalPages { get; private set; }

        public PaginatedList(IQueryable<T> source, int pageIndex, int pageSize) {
            PageIndex = pageIndex;
            PageSize = pageSize;
            TotalCount = source.Count();
            TotalPages = (int) Math.Ceiling(TotalCount / (double)PageSize);

            this.AddRange(source.Skip(PageIndex * PageSize).Take(PageSize));
        }

        public bool HasPreviousPage {
            get {
                return (PageIndex > 0);
            }
        }

        public bool HasNextPage {
            get {
                return (PageIndex+1 < TotalPages);
            }
        }
    }
}
