using Serilog;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

namespace Wood.Util
{

    public class PagedResult<T>
    {
        public List<T> Items { get; set; }
        public int TotalItems { get; set; }
        public int PageNumber { get; set; }
        public int PageSize { get; set; }
        public int TotalPages => (int)Math.Ceiling(TotalItems / (double)PageSize);
        public bool HasPreviousPage => PageNumber > 1;
        public bool HasNextPage => PageNumber < TotalPages;

        public PagedResult()
        {
            Items = new List<T>();
        }
    }


    public static class QueryableExtensions
    {
        public static PagedResult<T> ToPagedResult<T>(this IQueryable<T> query, int pageNumber, int pageSize)
        {
            var result = new PagedResult<T>
            {
                PageNumber = pageNumber,
                PageSize = pageSize,
                TotalItems = query.Count()
            };

            result.Items = query
                .Skip((pageNumber - 1) * pageSize)
                .Take(pageSize)
                .ToList();

            return result;
        }

        public static IQueryable<T> ApplySorting<T>(this IQueryable<T> query, string sortField, string sortDirection)
        {
            if (string.IsNullOrEmpty(sortField))
                return query;

            var parameter = Expression.Parameter(typeof(T), "x");
            var property = Expression.Property(parameter, sortField);
            var lambda = Expression.Lambda(property, parameter);

            string methodName = sortDirection?.ToLower() == "desc" ? "OrderByDescending" : "OrderBy";
            var resultExpression = Expression.Call(
                typeof(Queryable),
                methodName,
                new[] { typeof(T), property.Type },
                query.Expression,
                Expression.Quote(lambda));

            return query.Provider.CreateQuery<T>(resultExpression);
        }
    }





}