using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.WebUtilities;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using MTWorkHR.Application.Identity;
using MTWorkHR.Application.Mapper;
using MTWorkHR.Application.Models;
using MTWorkHR.Core.Global;
using MTWorkHR.Core.IRepositories;
using MTWorkHR.Core.UnitOfWork;
using MTWorkHR.Infrastructure.Entities;
using MTWorkHR.Application.Services.Interfaces;
using MTWorkHR.Core.Email;
using MTWorkHR.Core.Entities;
using System.Linq.Dynamic.Core;
using System.Linq;
using Microsoft.AspNetCore.Http;
using MTWorkHR.Core.Entities.Base;

namespace MTWorkHR.Application.Services
{
    public class AttendanceService : BaseService<Attendance, AttendanceDto, AttendanceDto>, IAttendanceService
    {
        private readonly IUnitOfWork _unitOfWork;
        private readonly GlobalInfo _globalInfo;
        private readonly IUserService _userService;

        public AttendanceService(IUnitOfWork unitOfWork, GlobalInfo globalInfo, IUserService userService) :base(unitOfWork)
        {
            _unitOfWork = unitOfWork;
            _globalInfo = globalInfo;
            _userService = userService;
        }
        public async Task<PagingResultDto<AttendanceDto>> GetAll(AttendancePagingInputDto PagingInputDto)
        {
            var res = await _unitOfWork.Attendance.GetAllWithChildrenAsync();
            var query = res.Item1;

            if (_globalInfo.UserType != UserTypeEnum.Business)
            {
                query = query.Where(m => m.UserId == _globalInfo.UserId);

            }
            if (PagingInputDto.Filter != null)
            {
                var filter = PagingInputDto.Filter;
                query = query.Where(u => u.LeaveReason!.Contains(filter) || u.UserName!.Contains(filter));
            }
                  
            if (PagingInputDto.SearchDate != null)
            {
                query = query.Where(u => u.AttendanceDate.Date == PagingInputDto.SearchDate.Value.Date);
            }

            if (PagingInputDto.UserId != null)
            {
                query = query.Where(u => u.UserId == PagingInputDto.UserId);
            }
            //var dayGroupByUser = query.GroupBy(m => new { m.UserId, m.UserName, AttendanceDate = m.AttendanceDate.Date }).Select
            //  (g => new Attendance
            //  {
            //      UserId = g.Key.UserId,
            //      UserName = g.Key.UserName,
            //      AttendanceDate = g.Key.AttendanceDate,
            //      TotalHours = g.Sum(s => (s.CheckInTime.HasValue && s.CheckOutTime.HasValue) ? (s.CheckOutTime.Value - s.CheckInTime.Value).TotalHours : 0)
            //  });

            var order = query.OrderBy(PagingInputDto.OrderByField + " " + PagingInputDto.OrderType);

            var page = order.Skip((PagingInputDto.PageNumber * PagingInputDto.PageSize) - PagingInputDto.PageSize).Take(PagingInputDto.PageSize);

            var total = await query.CountAsync();

            var list = MapperObject.Mapper
                .Map<IList<AttendanceDto>>(await page.ToListAsync());


            //var dayGroupByUser = list.GroupBy(m => new { m.UserId,m.WeekDay, m.UserName, AttendanceDate = m.AttendanceDate.Date }).Select
            //  (g => new AttendanceDto { 
            //      UserId = g.Key.UserId, UserName=g.Key.UserName,
            //      WeekDay= g.Key.WeekDay,
            //      AttendanceDate = g.Key.AttendanceDate, 
            //      TotalHours = g.Sum(s=> s.TotalHours) 
            //  }).ToList();
            var employeesList = list.Select(a => a.UserId).Distinct();
            Dictionary<string, UserBasicInfoDto> employeeDictList = new Dictionary<string, UserBasicInfoDto>();
            foreach (var RequestingEmployeeId in employeesList)
            {
                if (RequestingEmployeeId != null)
                {
                    var user = await _userService.GetUserWithAttachmentById(RequestingEmployeeId);
                    if (user != null)
                    {
                        var entitiy = MapperObject.Mapper.Map<UserBasicInfoDto>(user);
                        //item.Employee = entitiy;
                        var attach = user.UserAttachments?.FirstOrDefault(a => a.AttachmentTypeId == 9);
                        if (attach != null)
                            using (var stream = new MemoryStream(attach.Content))
                            {
                                var file = new FormFile(stream, 0, stream.Length, Path.GetFileNameWithoutExtension(attach.FileName), attach.FileName)
                                {
                                    Headers = new HeaderDictionary(),
                                    ContentType = attach.ContentType,
                                };

                                System.Net.Mime.ContentDisposition cd = new System.Net.Mime.ContentDisposition
                                {
                                    FileName = file.FileName
                                };
                                file.ContentDisposition = cd.ToString();
                                entitiy.ProfileImage = file;
                                
                            }
                        employeeDictList.Add(RequestingEmployeeId, entitiy);
                    }
                }
            }
            foreach (var item in list)
            {
                UserBasicInfoDto? employee;
                bool success = employeeDictList.TryGetValue(item.UserId, out employee);
               // var employee2 = employeeDictList[item.UserId];
                if(success && employee != null) item.Employee = employee;
            }
            var response = new PagingResultDto<AttendanceDto>
            {
                Result = list ,
                //Result = ! string.IsNullOrEmpty( PagingInputDto.UserId ) ? list : dayGroupByUser,
                Total = total
            };

            return response;
        }

        public override async Task<AttendanceDto> Create(AttendanceDto input)
        {
            if (input.CheckInTime.HasValue)
                input.AttendanceDate = input.CheckInTime.Value.Date;
            var oldEntity = await _unitOfWork.Attendance.GetAttendanceByUserId(input.UserId, input.AttendanceDate);
            if (oldEntity is null)
            {
                var entitiy = MapperObject.Mapper.Map<Attendance>(input);
                if (entitiy is null)
                    throw new AppException(ExceptionEnum.MapperIssue);

                var newEntity = await _unitOfWork.Attendance.AddAsync(entitiy);
                var Success = await _unitOfWork.CompleteAsync();

                var response = Mapper.MapperObject.Mapper.Map<AttendanceDto>(newEntity);
                return response;
            }
            else
            {
                throw new AppException(ExceptionEnum.UserAlreadyCheckedIn);
                var response = Mapper.MapperObject.Mapper.Map<AttendanceDto>(oldEntity);
                return response;
            }

        }

        public override async Task<AttendanceDto> Update(AttendanceDto input)
        {
            Attendance? entity = null;
            if (input.CheckInTime.HasValue)
                input.AttendanceDate = input.CheckInTime.Value.Date;
            else if (input.CheckOutTime.HasValue)
                input.AttendanceDate = input.CheckOutTime.Value.Date;
            if (input.Id > 0)
                entity = await _unitOfWork.Attendance.GetByIdAsync(input.Id);
            else
                entity = await _unitOfWork.Attendance.GetAttendanceByUserId(input.UserId, input.AttendanceDate);
            if (entity is null)
                throw new AppException(ExceptionEnum.RecordNotExist);
            entity.CheckOutTime = input.CheckOutTime;
            entity.LeaveType = input.LeaveType;
            entity.LeaveReason = input.LeaveReason;
          
            await _unitOfWork.CompleteAsync();

            var response = Mapper.MapperObject.Mapper.Map<AttendanceDto>(entity);
            return response;
        }

        public async Task<AttendanceDto?> GetAttendanceByUserId(string userId, DateTime attendanceDate)
        {
            var entity = await _unitOfWork.Attendance.GetAttendanceByUserId(userId, attendanceDate);
            if (entity is null)
                return null;
            var response = Mapper.MapperObject.Mapper.Map<AttendanceDto>(entity);
            return response;
        }

    }
}