using Mapster;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TFT_Model.Dto;

namespace TFT_BizService
{
    /// <summary>
    /// 分页查询扩展
    /// </summary>
    public static class QueryableExtension
    {
        /// <summary>
        /// 读取列表
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">查询表单式</param>
        /// <param name="parm">分页参数</param>
        /// <returns></returns>
        public static PagedInfo<T> ToPage<T>(this ISugarQueryable<T> source, PagerInfo parm)
        {
            var page = new PagedInfo<T>();
            var total = 0;
            page.PageSize = parm.PageSize;
            page.PageIndex = parm.PageNum;

            page.Result = source.OrderByIF(parm.Sort.IsNotEmpty(), $"{parm.Sort.ToSqlFilter()} {(parm.SortType.Contains("desc") ? "desc" : "asc")}")
                .ToPageList(parm.PageNum, parm.PageSize, ref total);
            page.TotalNum = total;
            return page;
        }

        /// <summary>
        /// 转指定实体类Dto
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="T2"></typeparam>
        /// <param name="source"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static PagedInfo<T2> ToPage<T, T2>(this ISugarQueryable<T> source, PagerInfo parm)
        {
            var page = new PagedInfo<T2>();
            var total = 0;
            page.PageSize = parm.PageSize;
            page.PageIndex = parm.PageNum;

            var result = source
                .OrderByIF(parm.Sort.IsNotEmpty(), $"{parm.Sort.ToSqlFilter()} {(parm.SortType.Contains("desc") ? "desc" : "asc")}")
                .ToPageList(parm.PageNum, parm.PageSize, ref total);

            page.TotalNum = total;
            page.Result = result.Adapt<List<T2>>();
            return page;
        }
        public static bool IsEmpty(this object value)
        {
            if (value != null && !string.IsNullOrEmpty(value.ParseToString()))
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        public static bool IsNotEmpty(this object value)
        {
            return !IsEmpty(value);
        }
        /// <summary>
        /// 将object转换为string，若转换失败，则返回""。不抛出异常。  
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ParseToString(this object obj)
        {
            try
            {
                if (obj == null)
                {
                    return string.Empty;
                }
                else
                {
                    return obj.ToString();
                }
            }
            catch
            {
                return string.Empty;
            }
        }
    }
}