using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Model.Managers
{
    public class MasterManager
    {
        public static User? CurrentConnectedUser;
        public static RecipeCollection? Recipes;
        public static List<User>? Users;

        public DataManager DataMgr { get; private set; }

        public MasterManager(IDataManager dataManager)
        {
            DataMgr = new DataManager(dataManager);
            CurrentConnectedUser = null;
        }

        public bool Login(string mail, string password)
        {
            if (Users is null || Users.Count == 0)
                throw new ArgumentNullException("There is no users registred.");

            User user = (User)(from u in Users
                               where u.Mail == mail
                               select u);

            if (user is null || !user.psswMgr.VerifyPassword(user.Password, password))
                return false;

            CurrentConnectedUser = user;
            return true;
        }

        public bool Logout()
        {
            if (CurrentConnectedUser is null)
                return false;

            CurrentConnectedUser = null;
            return true;
        }

        public bool Register(User newuser)
        {
            try
            {
                User user = newuser;
                DataMgr.Data[nameof(User)].Add(user);
                Users = DataMgr.GetUsers();
            }
            catch (ArgumentException e)
            {
                Debug.WriteLine(e.Message);
                return false;
            }

            return true;
        }

        public void AddRecipe(Recipe recipe)
        {
            DataMgr.Data[nameof(Recipe)].Add(recipe);
            Recipes = DataMgr.GetRecipes();
        }
    }
}