using AppException;
using Model;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Managers
{
    public class UserDefaultManager : IUserManager
    {
        private IDataManager _dataManager;
        private IPasswordManager _passwordManager;
        private User? _currentConnectedUser = null;

        public UserDefaultManager(IDataManager dataManager, IPasswordManager passwordManager)
        {
            _dataManager = dataManager;
            _passwordManager = passwordManager;
        }

        public User? CurrentConnectedUser => _currentConnectedUser;

        public bool AddUserToData(User user)
        {
            var userList = _dataManager.Data[nameof(User)];

            if (userList.Exists(r => r.Equals(user)))
                return false;

            _dataManager.Data[nameof(User)].Add(user);
            return true;
        }

        public ICollection<User> GetAllUsers()
        {
            return _dataManager.GetFromData<User>();
        }

        public User GetUserFromMail(string mail)
        {
            User? user = _dataManager.GetFromData<User>().ToList()
                                                         .Find(u => u.Mail == mail);
            if (user is null)
                throw new UserNotFoundException();

            return user;
        }

        public bool LogIn(string mail, string password)
        {
            if (CurrentConnectedUser is not null)
                throw new UserAlreadyConnectedException();

            User? user = _dataManager.GetFromData<User>().ToList()
                                                         .Find(u => u.Mail == mail);
            if (user is null)
                throw new UserNotFoundException();

            if (!_passwordManager.VerifyPassword(password, user.Password))
                return false;

            _currentConnectedUser = user;
            return true;
        }

        public void LogOut()
        {
            if (CurrentConnectedUser is null)
                throw new NoUserConnectedException();

            _currentConnectedUser = null;
        }

        public bool ModifyUserInData(User oldUser, User newUser)
        {
            try
            {
                var index = _dataManager.GetFromData<User>().ToList()
                                                            .FindIndex(u => u.Equals(oldUser));
                _dataManager.Data[nameof(User)][index] = newUser;
            }
            catch (ArgumentNullException e)
            {
                Debug.WriteLine("User to modify not found.");
                return false;
            }

            return true;
        }
    }
}