using System;
using System.Linq;
using System.Runtime.InteropServices;
using TimeTableSiteDomain;
using TimeTableSiteRepository.Interfaces;
using TimeTableSiteServices.Common;

namespace TimeTableSiteServices
{
    public class UserService : ServiceBase<UserEntity>
    {
        private readonly IUserRepository _userRepository;
        public UserService(IUserRepository repository) : base(repository)
        {
            _userRepository = repository;
        }

        public bool Autorization(string login, string password)
        {
            var existsLogin = _userRepository.FindLogin(login);

            return existsLogin.Count != 0 && CheckPassword(password, existsLogin[0].Password);
        }

        public bool AddUser(string name, string login, string password, string email)
        {
            var existsLogin = _userRepository.FindLogin(login);
            if (existsLogin.Count != 0) return false;

            _userRepository.Add(new UserEntity
            {
                Login = login,
                Mail = email,
                Name = name,
                Password = password
            });
            _userRepository.Save();
            return true;
        }

        public void DeleteUser(string login)
        {
            var user = _userRepository.FindLogin(login);
            if (user.Count == 0) return;

            _userRepository.Delete(user.First());
            _userRepository.Save();
        }

        private static bool CheckPassword(string password, string passwordHash)
        {
            return password == passwordHash;
        }

        public bool UpdatePassword(string login, string oldPassword, string newPassword)
        {
            var user = _userRepository.FindLogin(login);

            if ((user.Count == 0) && (!CheckPassword(oldPassword, user[0].Password))) return false;

            user[0].Password = newPassword;

            _userRepository.Update(user[0]);
            _userRepository.Save();

            return true;
        }

        public UserEntity FindUser(string login)
        {
            var user = _userRepository.FindLogin(login);
            return user.Count != 0 ? user[0] : null;
        }

        public bool UpdateName(string login, string name)
        {
            var user = _userRepository.FindLogin(login);
            if (user.Count == 0) return false;

            user[0].Name = name;

            _userRepository.Update(user[0]);
            _userRepository.Save();
            return true;
        }

        public bool UpdateMail(string login, string mail)
        {
            var user = _userRepository.FindLogin(login);
            if (user.Count == 0) return false;

            user[0].Mail = mail;

            _userRepository.Update(user[0]);
            _userRepository.Save();
            return true;
        }

    }
}