using System;
using System.Collections.Generic;

using skydiveLogs_api.DomainBusiness.Interfaces;
using skydiveLogs_api.DomainService.Repositories;
using skydiveLogs_api.Domain;
using System.Linq;

namespace skydiveLogs_api.DomainBusiness
{
    public class DropZoneService : IDropZoneService
    {
        public DropZoneService(IDropZoneRepository dropZoneRepository,
                               IFavoriteDropZoneRepository favoriteDropZoneRepository)
        {
            _dropZoneRepository = dropZoneRepository;
            _favoriteDropZoneRepository = favoriteDropZoneRepository;
        }

        public void AddNewDz(DropZone newdropZone)
        {
            _dropZoneRepository.Add(newdropZone);
        }

        public void DeleteDzById(int id)
        {
            throw new NotImplementedException();
        }

        public IEnumerable<DropZone> GetAllDzs(User connectedUser)
        {
            var results = Enumerable.Empty<DropZone>();
            
            var dropzones = _dropZoneRepository.GetAll();
            var favorites = _favoriteDropZoneRepository.GetAll(connectedUser);


            results = from dropZone in dropzones
                      join favorite in favorites on dropZone equals favorite.DropZone into tmp
                      from favoriteDz in tmp.DefaultIfEmpty()
                      select new DropZone
                      {
                          Id = dropZone.Id,
                          Address = dropZone.Address,
                          Email = dropZone.Email,
                          Latitude = dropZone.Latitude,
                          Longitude = dropZone.Longitude,
                          Name = dropZone.Name,
                          Type = dropZone.Type,
                          Website = dropZone.Website,
                          IsFavorite = !(favoriteDz == null)
                      };

            return results.ToList();
        }

        public DropZone GetDzById(int id)
        {
            return _dropZoneRepository.GetById(id);
        }

        public bool UpdateDz(int id, DropZone dropZone)
        {
            dropZone.Id = id;

            return _dropZoneRepository.Update(dropZone);
        }

        public bool AddToFavorite(int dzId, User connectedUser)
        {
            var dzToAddToFavorite = GetDzById(dzId);

            var favoriteDz = new FavoriteDropZone
            {
                DropZone = dzToAddToFavorite,
                User = connectedUser
            };

            var result = _favoriteDropZoneRepository.Add(favoriteDz);

            return result > 0;
        }

        public bool RemoveToFavorite(int dzId, User connectedUser)
        {
            var result = _favoriteDropZoneRepository.Delete(dzId, connectedUser.Id);

            return result > 0;
        }

        private readonly IDropZoneRepository _dropZoneRepository;

        private readonly IFavoriteDropZoneRepository _favoriteDropZoneRepository;
    }
}