using System.Linq.Dynamic.Core;
using System.Text;

namespace LCU.API.Internal.LoanRateLib.Extensions.Queryables;
public static class SortableFieldsQueryable
{
    public static IQueryable<RateUploadInfo> OrderBySortableFields(this IQueryable<RateUploadInfo> queryable, RateUploadInfoFilter rateUploadInfoFilter)
    {
        var sortableFields = rateUploadInfoFilter.SortableFields
                                                  .Where(sortableField => sortableField.Active && sortableField.Position >= 0)
                                                  .OrderBy(sortableField => sortableField.Position).ToList();
        
        if (sortableFields == null || !sortableFields.Any())
        {
            return queryable;
        }

        var orderBy = new StringBuilder();
        foreach (var field in sortableFields)
        {
            var addedComma = orderBy.ToString() == "" ? "" : " ,";
            var desc = field.IsDescending ? " desc" : "";
            orderBy.Append($"{addedComma}{field.Field}{desc}");
        }
        
        return queryable.OrderBy(orderBy.ToString());
    }
}