using FlexJobApi.Core;
using FlexJobApi.Core.Models;
using Furion.DatabaseAccessor;
using Mapster;
using MediatR;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FlexJobApi.User.Application.Menus.Queries
{
    /// <summary>
    /// 查询按钮/字段列表
    /// </summary>
    /// <param name="menuRep"></param>
    public class MenuSubListQueryHandler(IRepository<Menu> menuRep)
        : IRequestHandler<MenuSubListQuery, MenuSubListCallback>
    {
        private readonly IRepository<Menu> menuRep = menuRep;

        /// <inheritdoc/>
        public async Task<MenuSubListCallback> Handle(MenuSubListQuery request, CancellationToken cancellationToken)
        {
            var callback = new MenuSubListCallback();
            var q = menuRep.AsQueryable().AsNoTracking()
                .Where(it => it.ParentId == request.ParentId)
                .Where(it => it.Type == EnumMenuType.Button || it.Type == EnumMenuType.Field);
            var items = await q.ProjectToType<MenuSubListCallbackItem>().ToListAsync(cancellationToken);
            callback.Groups = items.GroupBy(it => it.Group ?? "Default")
                .Select(it => new MenuSubListCallbackGroup
                {
                    Name = it.Key,
                    Buttons = it.Where(g => g.Type == EnumMenuType.Button).ToList(),
                    Fields = it.Where(g => g.Type == EnumMenuType.Field).ToList(),
                })
                .ToList();
            return callback;
        }
    }
}