using System.Collections.Generic;
using MongoDB.Driver;
using LCU.Library.Internal.DocumentIngestorModels.Models.Pagination;

namespace LCU.Library.Internal.DocumentModels.Requests.Search;

public class Sorter<T>
{
    public static SortDefinition<T> GetSorter(List<SortableField> fields)
    {
        SortDefinition<T>? sortDefinition = null;

        if(fields == null)
        {
            return sortDefinition;
        }

        fields.Sort((a, b) => a.Position.CompareTo(b.Position));

        foreach (var field in fields)
        {
            if (sortDefinition == null)
            {
                sortDefinition = field.IsDescending ? Builders<T>.Sort.Descending(field.Field) : Builders<T>.Sort.Ascending(field.Field);
            }
            else
            {
                sortDefinition = field.IsDescending ? sortDefinition.Descending(field.Field) : sortDefinition.Ascending(field.Field);
            }
        }

        return sortDefinition;
    }
}