using System;
using System.Collections.Generic;
using LCU.API.Collections.RepoApi.Models.Filters;
using LCU.Shared.Collections.RepoApiLib.Models.Results;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

namespace LCU.API.Collections.RepoApi.Models.Responses
{
    public class PagedResponse<T> where T : class
    {
        public PagedResponse() { }

        public PagedResponse(PagedResult<T> pagedResult, PageFilter filter, IUrlHelper url, HttpRequest request, string uriAction = "Get")
        {
            TotalItems = pagedResult.Total;
            Items = pagedResult.Items;
            CurrentPage = filter.Page;
            TotalPages = pagedResult.Total == 0 ? 1 : (int) Math.Ceiling((decimal) pagedResult.Total / filter.Limit);

            PageFilter newFilter = filter.Clone() as PageFilter;
            if (pagedResult.Total > (filter.Page * filter.Limit))
            {
                newFilter.Page = filter.Page + 1;
                NextPage = new Uri(url.Action(uriAction, null, newFilter, request.Scheme));
            }

            if (filter.Page > 1)
            {
                newFilter.Page = filter.Page - 1;
                PreviousPage = new Uri(url.Action(uriAction, null, newFilter, request.Scheme));
            }

        }

        public IEnumerable<T> Items { get; set; }
        public Uri NextPage { get; set; }
        public Uri PreviousPage { get; set; }
        public int TotalItems { get; set; }
        public int CurrentPage { get; set; }
        public int TotalPages { get; set; }
    }
}