using System.ComponentModel.DataAnnotations;

namespace YunDa.SOMS.DataTransferObject
{
    /// <summary>
    /// 分页和排序请求基础DTO
    /// </summary>
    public class PagedAndSortedResultRequestDto
    {
        /// <summary>
        /// 页码（从1开始）
        /// </summary>
        [Range(1, int.MaxValue, ErrorMessage = "页码必须大于0")]
        public int PageIndex { get; set; } = 1;

        /// <summary>
        /// 每页大小
        /// </summary>
        [Range(1, 1000, ErrorMessage = "每页大小必须在1-1000之间")]
        public int PageSize { get; set; } = 20;

        /// <summary>
        /// 排序字段
        /// 格式: "Name" 或 "Name DESC" 或 "Name ASC, Age DESC"
        /// </summary>
        public string Sorting { get; set; }

        /// <summary>
        /// 跳过的记录数
        /// </summary>
        public int SkipCount => (PageIndex - 1) * PageSize;

        /// <summary>
        /// 最大结果数
        /// </summary>
        public int MaxResultCount => PageSize;
    }
}