using BuddyFinance.Common.Extensions;
using System.Collections.Generic;
using System.Linq;

namespace BuddyFinance.WebApi.Models.DataTables
{
    public abstract class Results
    {
        private static IEnumerable<T> Order<T>(IEnumerable<T> results, Request request) where T : Integration.Models.Administration.ActivityLog
        {
            if (request.order == null) return results;
            var columnIndex = request.order[0].column;
            var sortDirection = request.order[0].dir;
            var columnName = request.columns[columnIndex].data?.AsPropertyName();
            if (columnName == null)
                return results;

            var prop = typeof(T).GetProperty(columnName);
            return sortDirection == "asc" ? results.OrderBy(prop.GetValue) : results.OrderByDescending(prop.GetValue);
        }

        public static IList<T> PageResults<T>(IEnumerable<T> results, Request request) where T : Integration.Models.Administration.ActivityLog
        {
            var skip = request.start;
            var pageSize = request.length;
            var orderedResults = Order(results, request);
            return pageSize > 0 ? orderedResults.Skip(skip).Take(pageSize).ToList() : orderedResults.ToList();
        }
    }
}