using FlexJobApi.Core;
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.Application
{
    /// <summary>
    /// 数据字典类别查询处理器
    /// </summary>
    public class DictionaryCategoriesQueryHandler(
            IRepository<DictionaryCategory> rep
        ) : IRequestHandler<GetDictionaryCategoriesQuery, PagedListQueryResult<GetDictionaryCategoriesQueryResultItem>>,
            IRequestHandler<GetDictionaryCategorySelectQuery, List<SelectQueryResultItem<Guid>>>
    {
        private readonly IRepository<DictionaryCategory> rep = rep;

        /// <summary>
        /// 查询数据字典类别分页列表数据
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task<PagedListQueryResult<GetDictionaryCategoriesQueryResultItem>> Handle(GetDictionaryCategoriesQuery request, CancellationToken cancellationToken)
        {
            return request.PageModel.ToPagedListAsync<DictionaryCategory, GetDictionaryCategoriesQueryResultItem>(
                q =>
                {
                    q = q.OrderBy(it => it.Sort).ThenBy(it => it.CreatedTime);
                    if (request.Keywords.IsNotNull())
                    {
                        q = q.Where(it =>
                            it.Code.Contains(request.Keywords) ||
                            it.Name.Contains(request.Keywords) ||
                            it.Remark.Contains(request.Keywords));
                    }
                    return q;
                }, cancellationToken: cancellationToken);
        }

        /// <summary>
        /// 查询数据字典类别选择器数据
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task<List<SelectQueryResultItem<Guid>>> Handle(GetDictionaryCategorySelectQuery request, CancellationToken cancellationToken)
        {
            var items = rep.AsQueryable().AsNoTracking()
                .Select(it => new SelectQueryResultItem<Guid>
                {
                    Value = it.Id,
                    Label = it.Name,
                    Data = new
                    {
                        it.Id,
                        it.Name,
                        it.Remark,
                        it.FieldNames
                    }
                })
                .ToListAsync(cancellationToken);
            return items;
        }
    }
}