using FlexJobApi.Core;
using Furion.DatabaseAccessor;
using Furion.DistributedIDGenerator;
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>
    /// 任务命令处理器
    /// </summary>
    public class TaskInfoCommandHandler(
            IRepository<TaskInfo> rep
        ) :
        IRequestHandler<SaveTaskInfoCommand, Guid>,
        IRequestHandler<SetTaskInfoReleaseStatusCommand, int>,
        IRequestHandler<SetTaskInfoRecommendStatusCommand, int>
    {
        private readonly IRepository<TaskInfo> rep = rep;

        /// <summary>
        /// 保存任务
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        [UnitOfWork]
        public async Task<Guid> Handle(SaveTaskInfoCommand request, CancellationToken cancellationToken)
        {
            var logier = JwtUtils.GetCurrentLogier();
            return await request.SaveData<TaskInfo, SaveTaskInfoCommand>(
                 q =>
                 {
                     q = TaskInfoRepository.GetQueryable(rep)
                          .Include(it => it.Benefits)
                          .Include(it => it.CredentialLimits);
                     return q;
                 },
                 null,
                 (entity) =>
                 {
                     if (request.Id == null)
                     {
                         entity.EnterpriseId = logier.EnterpriseId.Value;
                         BuildCode(entity).Wait();
                     }
                     entity.Benefits = request.Benefits
                         .Select(it => new TaskInfoBenefit
                         {
                             BenefitCode = it
                         })
                         .ToList();
                     entity.CredentialLimits = request.CredentialLimits
                         .Select(it => new TaskInfoCredentialLimit
                         {
                             TypeCode = it
                         })
                         .ToList();
                     request.Adapt(entity);
                 },
                 cancellationToken);
        }

        /// <summary>
        /// 设置任务发布状态
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<int> Handle(SetTaskInfoReleaseStatusCommand request, CancellationToken cancellationToken)
        {
            var entities = await TaskInfoRepository.GetQueryable(rep)
                .Where(it => request.Ids.Contains(it.Id))
                .ToListAsync();
            foreach (var entity in entities)
            {
                entity.ReleaseStatus = request.ReleaseStatus;
            }
            await rep.UpdateAsync(entities);
            return entities.Count;
        }

        /// <summary>
        /// 设置任务是否推荐
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<int> Handle(SetTaskInfoRecommendStatusCommand request, CancellationToken cancellationToken)
        {
            var entities = await TaskInfoRepository.GetQueryable(rep)
                .Where(it => request.Ids.Contains(it.Id))
                .ToListAsync();
            foreach (var entity in entities)
            {
                entity.RecommendStatus = request.RecommendStatus;
            }
            await rep.UpdateAsync(entities);
            return entities.Count;
        }

        private async Task BuildCode(TaskInfo entity)
        {
            entity.Code = $"{DateTime.Now:yyyyMMddHHmm}{new Random(IDGen.NextID().GetHashCode()).Next(1000, 9999)}";
            var exist = await rep.AsQueryable().AsNoTracking()
               .AnyAsync(it => it.EnterpriseId == entity.EnterpriseId && it.Code == entity.Code);
            if (exist) await BuildCode(entity);
        }
    }
}