using FlexJobApi.Core;
using FlexJobApi.Core.Models;
using Furion.DatabaseAccessor;
using Furion.FriendlyException;
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>
    /// 查询菜单详情
    /// </summary>
    /// <param name="rep"></param>
    public class GetMenuQueryHandler(IRepository<Menu> rep)
        : IRequestHandler<GetMenuQuery, GetMenuQueryResult>
    {
        private readonly IRepository<Menu> rep = rep;

        /// <inheritdoc/>
        public async Task<GetMenuQueryResult> Handle(GetMenuQuery request, CancellationToken cancellationToken)
        {
            var model = await rep.AsQueryable().AsNoTracking()
                .Where(it => it.Id == request.Id)
                .ProjectToType<GetMenuQueryResult>()
                .FirstOrDefaultAsync(cancellationToken);
            if (model == null) throw Oops.Oh(EnumErrorCodeType.s404, "该菜单");
            var items = await rep.AsQueryable().AsNoTracking()
                .Where(it => it.ParentId == model.Id)
                .Where(it => it.Type == EnumMenuType.Button || it.Type == EnumMenuType.Field)
                .ProjectToType<GetMenuQueryResultItem>()
                .ToListAsync(cancellationToken);
            model.Groups = items.GroupBy(it => it.Group ?? "default")
                .Select(it => new GetMenuQueryResultGroup
                {
                    Group = it.Key,
                    ButtonLocations = it
                        .Where(it => it.Type == EnumMenuType.Button)
                        .GroupBy(it => it.Location ?? "default")
                        .Select(it => new GetMenuQueryResultButtonLocation
                        { 
                            Location = it.Key,
                            Buttons = it.ToList().Adapt<List<GetMenuQueryResultButton>>()
                        })
                        .ToList(),
                    Fields = it
                        .Where(it => it.Type == EnumMenuType.Field)
                        .ToList()
                        .Adapt<List<GetMenuQueryResultField>>()
                })
                .ToList();
            return model;
        }
    }
}