using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ToDoApp.Context;
using ToDoApp.Model;
using ToDoApp.Utility;

namespace ToDoApp.Service
{
    public class UserService
    {
        public static UserService Instance { get; set; } = new UserService();

        public User? FindUser(int userId)
        {
            using (var context = new ToDoContext())
            {
                return context.Users.Find(userId);
            }
        }

        public User? FindUser(string username)
        {
            using (var context = new ToDoContext())
            {
                return context.Users.FirstOrDefault(u => u.Name == username);
            }
        }

        public bool CheckUserLogin(string username, string password)
        {
            User? user = FindUser(username);
            if (user == null)
                return false;

            return Utils.VerifyPassword(password, user.Password);
        }

        public void CreateUser(User user)
        {
            using (var context = new ToDoContext())
            {
                user.Password = Utils.HashPassword(user.Password);
                user.CreateDate = DateTime.Now;
                context.Users.Add(user);
                context.SaveChanges();
            }
        }

        public void DisableUser(int userId)
        {
            using (var context = new ToDoContext())
            {
                User? user = context.Users.Find(userId);
                if (user == null)
                    return;

                user.Status = UserStatus.Invalid;
                context.SaveChanges();
            }
        }

        public void DisableUser(string username)
        {
            using (var context = new ToDoContext())
            {
                User? user = context.Users.FirstOrDefault(u => u.Name == username);
                if (user == null)
                    return;

                user.Status = UserStatus.Invalid;
                context.SaveChanges();
            }
        }

        public void RemoveUser(int userId)
        {
            using (var context = new ToDoContext())
            {
                User? user = context.Users.Find(userId);
                if (user == null)
                    return;

                context.Users.Remove(user);
                context.SaveChanges();
            }
        }

        public void RemoveUser(string username)
        {
            using (var context = new ToDoContext())
            {
                User? user = context.Users.FirstOrDefault(u => u.Name == username);
                if (user == null)
                    return;

                context.Users.Remove(user);
                context.SaveChanges();
            }
        }

        public void RemoveUser(User user)
        {
            RemoveUser(user.Id);
        }
    }
}