using AutoMapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace zzz.Model
{
    /// <summary>
    /// 通用分页信息类
    /// </summary>
    public class PageModel<T>
    {
        /// <summary>
        /// 当前页标
        /// </summary>
        public int pageIndex { get; set; } = 1;
        /// <summary>
        /// 每页大小
        /// </summary>
        public int pageSize { set; get; } = 20;
        /// <summary>
        /// 总页数
        /// </summary>
        public int totalPages => (int)Math.Ceiling((decimal)totalCount / pageSize);
        /// <summary>
        /// 数据总数
        /// </summary>
        public int totalCount { get; set; } = 0;
        /// <summary>
        /// 返回数据
        /// </summary>
        public List<T> rows { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public PageModel() { }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="pageIndex"></param>
        /// <param name="totalCount"></param>
        /// <param name="pageSize"></param>
        /// <param name="rows"></param>
        public PageModel(int pageIndex, int totalCount, int pageSize, List<T> rows)
        {
            this.pageIndex = pageIndex;
            this.totalCount = totalCount;
            this.pageSize = pageSize;
            this.rows = rows;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TOut"></typeparam>
        /// <returns></returns>
        //private PageModel<TOut> ConvertTo<TOut>()
        //{
        //    return new PageModel<TOut>(pageIndex, totalCount, pageSize, default);
        //}

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TOut"></typeparam>
        /// <returns></returns>
        public PageModel<TOut> ConvertTo<TOut>()
        {
            var model = new PageModel<TOut>(pageIndex, totalCount, pageSize, default);

            if (rows != null)
            {
                var cfg = new MapperConfiguration(cfg => cfg.CreateMap<T, TOut>());
                var m = cfg.CreateMapper();

                model.rows = m.Map<List<TOut>>(rows);
            }

            return model;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TOut"></typeparam>
        /// <param name="options"></param>
        /// <returns></returns>
        public PageModel<TOut> ConvertTo<TOut>(Action<IMappingOperationOptions> options)
        {
            var model = new PageModel<TOut>(pageIndex, totalCount, pageSize, default);
            if (rows != null)
            {
                var cfg = new MapperConfiguration(cfg => cfg.CreateMap<T, TOut>());
                var m = cfg.CreateMapper();

                model.rows = m.Map<List<TOut>>(rows, options);
            }

            return model;

        }

    }
}