using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace Auth.Core.Utility;

public static class QueryableExtensions
{
    public static IQueryable<T> ApplySorting<T>(this IQueryable<T> source, SortModel sortBy)
    {
        // Parameter for lambda expression, e.g., "p" in "p => p.Property"
        var parameter = Expression.Parameter(typeof(T), "p");

        // Access the property on the parameter, e.g., "p.Property"
        var property = Expression.Property(parameter, sortBy.SortBy);

        // Cast property access to an object (boxing value types)
        var converted = Expression.Convert(property, typeof(object));

        // Create the lambda expression, e.g., "p => (object)p.Property"
        var keySelector = Expression.Lambda<Func<T, object>>(converted, parameter);

        // Apply OrderBy or OrderByDescending based on the ascending flag
        return sortBy.SortDirection == SortDir.Ascending
            ? source.OrderBy(keySelector)
            : source.OrderByDescending(keySelector);
    }
}