using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using OAuth2Study.Model;
using OAuth2Study.IDal;
using OAuth2Study.IBll;

namespace OAuth2Study.Bll
{
    public class UserBll:UserIBll
    {
        public UserIDal UserIDal;

        public UserBll(UserIDal userDal)
        {
            this.UserIDal = userDal;
        }

        public (bool result, User user) AddUser(User user)
        {
            if (ExitsByName(user.Name))
            {
                return ValueTuple.Create(false, user);
            }

           return  UserIDal.AddUser(user);
        }

        public (bool result, User user) UpdateUser(User user)
        {
            return UserIDal.UpdateUser(user);
        }

        public bool RemoveUser(User user)
        {
            return UserIDal.RemoveUser(user);
        }

        public bool RemoveUser(int userId)
        {
            return UserIDal.RemoveUser(userId);
        }

        public IQueryable<User> GetUsers()
        {
            return UserIDal.GetUsers();
        }

        public IQueryable<User> GetUsers(Func<User, bool> predicate)
        {
            return UserIDal.GetUsers(predicate);
        }

        public User GetUser(int userId)
        {
            return UserIDal.GetUser(userId);
        }

        public bool ExitsByName(string userName)
        {
            return UserIDal.ExitsByName(userName);
        }
    }
}