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

namespace LCU.API.Internal.LoanRateLoadTestingLib.Extensions.Queryables;
public static class SortableFieldsQueryable
{
    public static IQueryable<LoadTestRunInfo> OrderBySortableFields(this IQueryable<LoadTestRunInfo> queryable, LoadTestRunInfoFilter loadTestRunInfoFilter)
    {
        var sortableFields = loadTestRunInfoFilter.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());
    }
}