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 MTWorkHR.Infrastructure.UnitOfWorks;
using MTWorkHR.Core.Entities.User;
using Azure;
using System.Security.Claims;
using MTWorkHR.Core.Entities.Base;

namespace MTWorkHR.Application.Services
{
    public class OrderRequestService : BaseService<OrderRequest, OrderRequestDto, OrderRequestDto>, IOrderRequestService
    {
        private readonly IUnitOfWork _unitOfWork;
        private readonly IMailSender _emailSender;
        private readonly ApplicationUserManager _userManager;

        public OrderRequestService(IUnitOfWork unitOfWork, IMailSender emailSender, ApplicationUserManager userManager) : base(unitOfWork)
        {
            _unitOfWork = unitOfWork;
            _emailSender = emailSender;
            _userManager = userManager;
        }


        public override async Task<OrderRequestDto> GetById(long id)
        {
            var entity = await _unitOfWork.OrderRequest.GetByIdWithAllChildren(id);
            var response = MapperObject.Mapper.Map<OrderRequestDto>(entity);
            return response;
        }
        public override async Task<OrderRequestDto> Create(OrderRequestDto input)
        {
            var period = DateTime.Now.Year;
            var allocation = await _unitOfWork.OrderAllocation.GetUserAllocations(input.RequestingEmployeeId, input.OrderTypeId, input.LeaveTypeId, period);

            if (allocation is null)
            {
                throw new AppException(ExceptionEnum.RecordNotExist, "You do not have any allocations for this leave type.");
            }
            else
            {
                int daysRequested = (int)(input.EndDate - input.StartDate).TotalDays;
                if (daysRequested > allocation.NumberOfDays)
                {
                    throw new AppException(ExceptionEnum.RecordNotExist, "You do not have enough days for this request");
                }
            }
            var orderRequest = MapperObject.Mapper.Map<OrderRequest>(input);
            orderRequest = await _unitOfWork.OrderRequest.AddAsync(orderRequest);
            await _unitOfWork.CompleteAsync();

            try
            {
                var requestingEmployee = await _userManager.Users.FirstOrDefaultAsync(x => x.Id == input.RequestingEmployeeId);
                var sendMailResult = await _emailSender.SendEmail(new EmailMessage
                {
                    To = requestingEmployee.Email,
                    Body = $"Your leave request for {input.StartDate:D} to {input.EndDate:D} " +
                    $"has been submitted successfully.",
                    Subject = "Leave Request Submitted",
                    userId = input.RequestingEmployeeId
                });
                if (!sendMailResult)
                {
                    throw new AppException("User created, but could not send the email!");
                }
            }
            catch (Exception ex)
            {
                //// Log or handle error, but don't throw...
            }
            var response = MapperObject.Mapper.Map<OrderRequestDto>(orderRequest);

            return response;
        }


        public async Task<OrderRequestDto> ChangeStatus(long id, int statusId )
        {
            var orderRequest = await _unitOfWork.OrderRequest.GetByIdAsync(id);
            orderRequest.OrderStatus = (ApprovalStatusEnum)statusId;
            if (orderRequest.OrderStatus == ApprovalStatusEnum.Approved)
            {
                var allocation = await _unitOfWork.OrderAllocation.GetUserAllocations(orderRequest.RequestingEmployeeId, orderRequest.OrderTypeId, orderRequest.LeaveTypeId, DateTime.Now.Year);
                int daysRequested = !orderRequest.EndDate.HasValue ? 1 : (int)(orderRequest.EndDate.Value - orderRequest.StartDate).TotalDays;
                allocation.NumberOfDays -= daysRequested;
            }
            await _unitOfWork.CompleteAsync();
            var response = MapperObject.Mapper.Map<OrderRequestDto>(orderRequest);
            return response;
        }



    }
}