using System;
using System.Linq;
using System.Text;
using IOL.Fagprove.Data;
using IOL.Fagprove.Data.Enums;
using IOL.Fagprove.Data.Models;
using IOL.Fagprove.Services.Interfaces;
using IOL.Fagprove.Utilities;

namespace IOL.Fagprove.Services
{
    public class AppReservationService : IAppReservationService
    {
        private readonly AppDbContext _context;

        public AppReservationService(AppDbContext context)
        {
            _context = context;
        }

        public bool ReservationIsPossible(Reservation reservation)
        {
            var reservationsForThisCabin = _context.Reservations.Where(r => 
                                                                               r.ReservationObjectId == reservation.ReservationObjectId
                                                                               && r.Status == ReservationStatus.Granted
                                                                               && DateTime.Compare(r.From, DateTime.Today) >= 0).ToList();
            if (reservationsForThisCabin.Count == 0) return true;
            return reservationsForThisCabin.Select(item => item.From < reservation.To && reservation.From < item.To).All(overlaps => !overlaps);
        }

        public bool ReservationIsValid(Reservation reservation)
        {
            if (reservation.From == default) return false;
            if (reservation.To == default) return false;
            if (reservation.UserId == default) return false;
            if (reservation.ReservationObjectId == default) return false;
            if (reservation.To < reservation.From) return false;
            return reservation.From < reservation.To;
        }

        public bool SendReservationStatusMail(Reservation reservation)
        {
            var user = _context.Users.SingleOrDefault(u => u.Id == reservation.UserId);
            if (user == default) return false;
            if (reservation.Status == ReservationStatus.Pending) return false;
            var cabin = _context.Cabins.SingleOrDefault(c => c.Id == reservation.ReservationObjectId);
            var message = new StringBuilder();
            var title = "";
            message.AppendLine("Hei " + user.Name);
            message.AppendLine();
            switch (reservation.Status)
            {
                case ReservationStatus.Granted:
                    title = "Reservasjon innvilget";
                    message.AppendLine("Din reservasjon er godkjent!");
                    break;
                case ReservationStatus.Rejected:
                    title = "Reservasjon avvist";
                    message.AppendLine("Din reservasjon er avvist!");
                    break;
            }
            message.AppendLine();
            message.AppendLine("Hytte: " + cabin?.Name);
            message.AppendLine("Fra: " + reservation.From.ToString("dd-MM-yyyy"));
            message.AppendLine("Til: " + reservation.To.ToString("dd-MM-yyyy"));
            var statusMail = new Email
            {
                Message = message.ToString(),
                Recepient = user.Email,
                Title = title + " - Din bedrifts reservasjonstjeneste"
            };
            statusMail.Send();
            return statusMail.Sent;
        }
    }
}