using AccountsContracts.BindingModels;
using AccountsContracts.ViewModels;
using AccountsDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AccountsDataBaseImplement.Models
{
    public class Account : IAccountModel
    {
        [Required]
        public string Login { get; set; } = string.Empty;
        [Required]
        public string Password { get; set; } = string.Empty;
        [Required]
        public string Email { get; set; } = string.Empty;

        public int Id { get; private set; }

        private Dictionary<int, IInterestModel>? _accountInterests = null;
        [NotMapped]
        public Dictionary<int, IInterestModel> AccountInterests
        {
            get
            {
                if (_accountInterests == null)
                {
                    _accountInterests = Interests
                    .ToDictionary(recPI => recPI.InterestId, recPI => recPI.Interest as IInterestModel);
                }
                return _accountInterests;
            }
        }
        [ForeignKey("AccountId")]
        public virtual List<AccountInterest> Interests { get; set; } = new();

        public static Account? Create(AccountBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            return new Account()
            {
                Id = model.Id,
                Login = model.Login,
                Password = model.Password,
                Email = model.Email,
            };
        }
        public static Account? Create(AccountViewModel? model)
        {
            return new Account()
            {
                Id = model.Id,
                Login = model.Login,
                Password = model.Password,
                Email = model.Email,
            };
        }
        public void Update(AccountBindingModel? model)
        {
            if (model == null)
            {
                return;
            }
            Login = model.Login;
            Password = model.Password;
        }
        public AccountViewModel GetViewModel => new()
        {
            Id = Id,
            Login = Login,
            Password = Password,
            Email = Email,
        };
        public void UpdateInterests(AccountsDatabase context, AccountBindingModel model)
        {
            var accountInterests = context.AccountInterests.Where(rec => rec.AccountId == model.Id).ToList();
            if (accountInterests != null && accountInterests.Count > 0)
            {
                // удалили те, которых нет в модели
                context.AccountInterests.RemoveRange(accountInterests.Where(rec => !model.AccountInterests.ContainsKey(rec.InterestId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateInterest in accountInterests)
                {
                    model.AccountInterests.Remove(updateInterest.InterestId);
                }
                var account = context.Accounts.First(x => x.Id == Id);
                foreach (var pc in model.AccountInterests)
                {
                    context.AccountInterests.Add(new AccountInterest
                    {
                        Account = account,
                        Interest = context.Interests.First(x => x.Id == pc.Key),
                    });
                    context.SaveChanges();
                }
                _accountInterests = null;
            }
        }
    }
}