using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using PodNoms.Api.Models;
using PodNoms.Api.Persistence;
using PodNoms.Api.Utils;
using PodNoms.Api.Utils.Extensions;

namespace PodNoms.Api.Persistence {
    public class UserRepository : IUserRepository {
        private readonly PodnomsDbContext _context;

        public UserRepository (PodnomsDbContext context) {
            _context = context;
        }

        public User Get (int id) {
            return _context.Users.FirstOrDefault (u => u.Id == id);
        }

        public User Get (string email) {
            return _context.Users.FirstOrDefault (u => u.EmailAddress == email);
        }
        public async Task<User> GetBySlugAsync (string slug) {
            var user = await _context.Users
                .Where (u => u.Slug == slug)
                .FirstOrDefaultAsync ();

            return user;
        }

        public User AddOrUpdate (User user) {
            if (user.Id != 0) {
                _context.Users.Attach (user);
            } else {
                _context.Users.Add (user);

            }
            return user;
        }

        public User UpdateRegistration (string email, string name, string sid, string providerId, string profileImage, string refreshToken) {
            var user = _context.Users.FirstOrDefault (u => u.EmailAddress == email);

            if (user == null) {
                user = new User ();
                user = new User ();
                user.EmailAddress = email;
            }
            user.FullName = string.IsNullOrEmpty (user.FullName) ? name : user.FullName;
            if (string.IsNullOrEmpty (user.Slug)) {
                var c = user.FullName ?? email?.Split ('@') [0] ?? string.Empty;
                if (!string.IsNullOrEmpty (c)) {
                    user.Slug = c.Slugify (
                        from u in _context.Users select u.Slug);
                }
            }
            if (!string.IsNullOrEmpty (refreshToken)) {
                user.RefreshToken = refreshToken;
            }
            user.Sid = sid;
            user.ProfileImage = profileImage;

            if (string.IsNullOrEmpty (user.ApiKey))
                UpdateApiKey (user);

            AddOrUpdate (user);
            return user;
        }

        public string UpdateApiKey (User user) {
            var newKey = "";
            if (user != null) {
                do {
                    newKey = Randomisers.RandomString (16);
                } while (_context.Users.FirstOrDefault (u => u.ApiKey == newKey) != null);
            }
            user.ApiKey = newKey;
            return newKey;
        }
    }
}