using FlexJobApi.Core;
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.CommonServer.Application
{
    /// <summary>
    /// 数据字典查询处理器
    /// </summary>
    public class DictionaryDatasQueryHandler(
            IRepository<DictionaryData> rep
        ) : IRequestHandler<GetDictionaryDatasQuery, PagedListQueryResult<GetDictionaryDatasQueryResultItem>>,
            IRequestHandler<GetDictionaryDataSelectQuery, List<SelectOption<string, GetDictionaryDataSelectQueryResultOption>>>,
            IRequestHandler<GetAreaSelectQuery, List<GetAreaSelectQueryResultOption>>
    {
        private readonly IRepository<DictionaryData> rep = rep;

        /// <summary>
        /// 获取数据字典分页列表数据
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task<PagedListQueryResult<GetDictionaryDatasQueryResultItem>> Handle(GetDictionaryDatasQuery request, CancellationToken cancellationToken)
        {
            return request.PageModel.GetPagedListAsync<DictionaryData, GetDictionaryDatasQueryResultItem>(
                q =>
                {
                    q = q.OrderBy(it => it.Sort).ThenBy(it => it.CreatedTime);
                    if (request.CategoryId.HasValue)
                    {
                        q = q.Where(it => it.CategoryId == request.CategoryId);
                    }
                    else if (request.CategoryCode.IsNotNull())
                    {
                        q = q.Where(it => it.Category.Code == request.CategoryCode);
                    }
                    else
                    {
                        throw Oops.Oh(EnumErrorCodeType.s400, "请填写类别Id或编号");
                    }
                    if (request.ParentId.HasValue)
                    {
                        q = q.Where(it => it.ParentId == request.ParentId);
                    }
                    if (request.Keywords.IsNotNull())
                    {
                        q = q.Where(it =>
                            it.Code.Contains(request.Keywords)
                            || it.Content.Contains(request.Keywords)
                            || it.Field1.Contains(request.Keywords)
                            || it.Field2.Contains(request.Keywords)
                            || it.Field3.Contains(request.Keywords)
                            || it.Field4.Contains(request.Keywords)
                            || it.Field5.Contains(request.Keywords));
                    }
                    return q;
                }, cancellationToken: cancellationToken);
        }

        /// <summary>
        /// 查询数据字典选择器
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<List<SelectOption<string, GetDictionaryDataSelectQueryResultOption>>> Handle(GetDictionaryDataSelectQuery request, CancellationToken cancellationToken)
        {
            var models = await request.GetSelect<DictionaryData, string, GetDictionaryDataSelectQueryResultOption>(
                it => it.Code,
                it => it.Content,
                q =>
                {
                    q = q
                        .OrderBy(it => it.Sort)
                        .Where(it => !it.IsDisabled);
                    if (request.All != true)
                    {
                        q = q.Where(it => it.ParentId == request.ParentId);
                    }
                    if (request.MaxDeep.HasValue)
                    {
                        q = q.Where(it => it.Deep <= request.MaxDeep);
                    }
                    if (request.Keywords.IsNotNull())
                    {
                        q = q.Where(it =>
                            it.Code.Contains(request.Keywords)
                            || it.Content.Contains(request.Keywords)
                            || it.Field1.Contains(request.Keywords)
                            || it.Field2.Contains(request.Keywords)
                            || it.Field3.Contains(request.Keywords)
                            || it.Field4.Contains(request.Keywords)
                            || it.Field5.Contains(request.Keywords));
                    }
                    if (request.CategoryId.HasValue)
                    {
                        q = q.Where(it => it.CategoryId == request.CategoryId);
                    }
                    else if (request.CategoryCode.IsNotNull())
                    {
                        q = q.Where(it => it.Category.Code == request.CategoryCode);
                    }
                    else
                    {
                        throw Oops.Oh(EnumErrorCodeType.s400, "请填写类别Id或编号");
                    }
                    return q;
                },
                cancellationToken);
            if (request.WithChildren)
            {
                var parents = models.Where(it => it.Data.ParentId == null).ToList();
                LoopChildrens(parents, models);
                return parents;
            }
            return models;
        }

        /// <summary>
        /// 查询地区选择器
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<List<GetAreaSelectQueryResultOption>> Handle(GetAreaSelectQuery request, CancellationToken cancellationToken)
        {
            var models = await Handle(new GetDictionaryDataSelectQuery
            {
                CategoryCode = "70",
                All = true,
                MaxDeep = request.MaxDeep,
                WithChildren = true
            }, cancellationToken);
            var result = models.Adapt<List<GetAreaSelectQueryResultOption>>();
            return result;
        }

        /// <summary>
        /// 递归赋值下级
        /// </summary>
        /// <param name="models"></param>
        /// <param name="all"></param>
        private void LoopChildrens(List<SelectOption<string, GetDictionaryDataSelectQueryResultOption>> models, List<SelectOption<string, GetDictionaryDataSelectQueryResultOption>> all)
        {
            foreach (var item in models)
            {
                item.Data.Children = all.Where(it => it.Data.ParentId == item.Data.Id).ToList();
                if (item.Data.Children.IsNotNull())
                {
                    LoopChildrens(item.Data.Children, all);
                }
            }
        }
    }
}