using System.Drawing.Printing;

namespace AipDatabase.API.Models
{
    public class Pagination<T>
    {
        public int page { get; set; }
        public int pageSize { get; set; }
        public int pagePerCount { get; set; }
        public int totalCount { get; set; }
        public int currentPage { get; set; }
        public int totalPageCount { get; set; }
        public int startPage { get; set; }
        public int endPage { get; set; }
        public int startRow { get; set; }
        public int endRow { get; set; }
        public int prev { get; set; }
        public int next { get; set; }
        public List<T> lists { get; set; }

        public Pagination(int page, int pageSize, int pagePerCount, int totalCount)
        {
            this.page = page;
            this.pageSize = pageSize;
            this.pagePerCount = pagePerCount;
            this.totalCount = totalCount;
            this.currentPage = this.page;

            this.totalPageCount = this.getTotalPageCount(this.totalCount, this.pagePerCount);
            this.startPage = this.getStartPage(this.page, this.pageSize);
            this.endPage = this.getEndPage(this.startPage, this.totalPageCount, this.pageSize);
            this.startRow = this.getStartRow(this.page, this.pagePerCount);
            this.endRow = this.getEndRow(this.startRow, this.pagePerCount, this.totalCount);
            this.prev = this.getPrev(this.pageSize, this.startPage);
            this.next = this.getNext(this.endPage, this.totalPageCount);
            this.lists = new List<T>();
        }

        private int getStartPage(int page, int pageSize)
        {
            int start = (int)Math.Floor((double)page / pageSize);
            if (page % pageSize == 0)
            {
                start--;
            }
            return (start * pageSize) + 1;
        }

        private int getEndPage(int startPage, int totalPageCount, int pageSize)
        {
            int endPage = (startPage - 1) + pageSize;
            if (endPage > totalPageCount)
            {
                endPage = totalPageCount;
            }
            return endPage;
        }

        private int getStartRow(int page, int pagePerCount)
        {
            return ((page - 1) * pagePerCount) + 1;
        }

        private int getEndRow(int startRow, int pagePerCount, int totalCount)
        {
            int endRow = startRow + pagePerCount - 1;
            if (endRow > totalCount)
            {
                endRow = totalCount;
            }
            return endRow;
        }

        private int getPrev(int pageSize, int startPage)
        {
            return (pageSize < startPage) ? (startPage - pageSize) : 0;
        }

        private int getNext(int endPage, int totalPageCount)
        {
            return (endPage + 1 <= totalPageCount) ? (endPage + 1) : 0;
        }

        private int getTotalPageCount(int totalCount, int pagePerCount)
        {
            return (int)Math.Ceiling(totalCount * 1.0 / pagePerCount);
        }
    }
}