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

namespace FlexJobApi.FlexJobServer.Application
{
    /// <summary>
    /// 任务雇佣命令处理器
    /// </summary>
    public class TaskUserCommandHandler(
            IRepository<TaskInfoUser> rep,
            IRepository<UserTaskCollect> repUserTaskCollect
        ) :
        IRequestHandler<CollectTaskCommand, int>,
        IRequestHandler<ApplyTaskCommand, int>,
        IRequestHandler<SetTaskUserHireCommand, int>
    {
        private readonly IRepository<TaskInfoUser> rep = rep;
        private readonly IRepository<UserTaskCollect> repUserTaskCollect = repUserTaskCollect;

        /// <summary>
        /// 收藏任务
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<int> Handle(CollectTaskCommand request, CancellationToken cancellationToken)
        {
            var logier = JwtUtils.GetCurrentLogier();
            var collects = await repUserTaskCollect.AsQueryable().AsNoTracking()
                .Where(it => request.Ids.Contains(it.TaskInfoId) && it.UserId == logier.Id)
                .ToListAsync(cancellationToken);
            if (request.IsCollect)
            {
                var addIds = request.Ids.Where(it => !collects.Any(c => c.TaskInfoId == it)).ToList();
                foreach (var addId in addIds)
                {
                    var entity = new UserTaskCollect
                    {
                        TaskInfoId = addId,
                        UserId = logier.Id
                    };
                    await repUserTaskCollect.InsertAsync(entity);
                }
                return addIds.Count;
            }
            else
            {
                await repUserTaskCollect.DeleteAsync(collects);
                return collects.Count;
            }
        }

        /// <summary>
        /// 报名任务
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<int> Handle(ApplyTaskCommand request, CancellationToken cancellationToken)
        {
            var logier = JwtUtils.GetCurrentLogier();
            var applyIds = await rep.AsQueryable().AsNoTracking()
                .Where(it => request.Ids.Contains(it.TaskInfoId) && it.UserId == logier.Id)
                .Select(it => it.TaskInfoId)
                .ToListAsync(cancellationToken);
            var addIds = request.Ids.Where(it => !applyIds.Contains(it)).ToList();
            foreach (var addId in addIds)
            {
                var entity = new TaskInfoUser
                {
                    TaskInfoId = addId,
                    UserId = logier.Id,
                    HireStatus = EnumTaskUserHireStatus.Wait
                };
                await rep.InsertAsync(entity);
            }
            return addIds.Count;
        }

        /// <summary>
        /// 任务录用
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<int> Handle(SetTaskUserHireCommand request, CancellationToken cancellationToken)
        {
            var logier = JwtUtils.GetCurrentLogier();
            var entities = await rep.AsQueryable()
                .Where(it => 
                    it.TaskInfo.EnterpriseId == logier.Id 
                    && it.TaskInfoId == request.Id 
                    && request.UserIds.Contains(it.UserId)
                    && it.HireStatus != request.HireStatus)
                .ToListAsync(cancellationToken);
            if (entities.IsNotNull())
            {
                foreach (var entity in entities)
                {
                    entity.HireStatus = request.HireStatus;
                    if (entity.HireStatus == EnumTaskUserHireStatus.Pass)
                    {
                        entity.SignContractStatus = EnumTaskUserSignContractStatus.Pass;
                    }
                }
                await rep.UpdateAsync(entities);
            }
            return entities.Count;
        }
    }
}