using System.Linq.Dynamic.Core;

namespace Complex.Application.Common
{
    public static class Pagination
    {
        public static IQueryable<TSource> ToPagedByOrder<TSource>(this IQueryable<TSource> source,
            CommonRequestDto commonRequest, out int rowsCount)
        {
            if (commonRequest.Length < 0)
                commonRequest.Length = 20000;
            if (commonRequest.Length == 0)
                commonRequest.Length = 10;

            rowsCount = source.Count();

            if (commonRequest.sortDirection == SortDirection.desc)
                commonRequest.SortField += " DESC";

            source = source.OrderBy(commonRequest.SortField);

            return source.Skip(commonRequest.Page * commonRequest.Length).Take(commonRequest.Length);
        }
        public static IQueryable<TSource> ToPaged<TSource>(this IQueryable<TSource> source, int page, int pageSize, out int rowsCount)
        {
            if (pageSize == -1)
                pageSize = 20000;
            if (pageSize == 0)
                pageSize = 10;

            rowsCount = source.Count();
            return source.Skip(page * pageSize).Take(pageSize);
        }
        public static IQueryable<TSource> ToPaged<TSource>(this IQueryable<TSource> source, int page, int pageSize)
        {
            if (pageSize == -1)
                pageSize = 20000;
            if (pageSize == 0)
                pageSize = 10;

            return source.Skip(page * pageSize).Take(pageSize);
        }
    }
}