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

namespace TravelCompanyDatabaseImplement.Models
{
    public class Travel : ITravelModel
    {
        public int Id { get; set; }
        [Required]
        public string TravelName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IConditionModel, int)>? _travelConditions = null;
        [NotMapped]
        public virtual List<Order> Orders { get; set; } = new();
        public Dictionary<int, (IConditionModel, int)> TravelConditions
        {
            get
            {
                if (_travelConditions == null)
                {
                    _travelConditions = Conditions.ToDictionary(recPC => recPC.ConditionId, recPC =>
                   (recPC.Condition as IConditionModel, recPC.Count));
                }
                return _travelConditions;
            }
        }
        [ForeignKey("TravelId")]
        public virtual List<TravelCondition> Conditions { get; set; } = new();
        public static Travel Create(TravelCompanyDatabase context,
       TravelBindingModel model)
        {
            return new Travel()
            {
                Id = model.Id,
                TravelName = model.TravelName,
                Price = model.Price,
                Conditions = model.TravelConditions.Select(x => new
               TravelCondition
                {
                    Condition = context.Conditions.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(TravelBindingModel model)
        {
            TravelName = model.TravelName;
            Price = model.Price;
        }
        public TravelViewModel GetViewModel => new()
        {
            Id = Id,
            TravelName = TravelName,
            Price = Price,
            TravelConditions = TravelConditions
        };
        public void UpdateConditions(TravelCompanyDatabase context,
       TravelBindingModel model)
        {
            var travelConditions = context.TravelConditions.Where(rec => rec.TravelId == model.Id).ToList();
            if (travelConditions != null && travelConditions.Count > 0)
            { // удалили те, которых нет в модели
                context.TravelConditions.RemoveRange(travelConditions.Where(rec
               => !model.TravelConditions.ContainsKey(rec.ConditionId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateCondition in travelConditions)
                {
                    updateCondition.Count =
                   model.TravelConditions[updateCondition.ConditionId].Item2;
                    model.TravelConditions.Remove(updateCondition.ConditionId);
                }
                context.SaveChanges();
            }
            var travel = context.Travels.First(x => x.Id == Id);
            foreach (var pc in model.TravelConditions)
            {
                context.TravelConditions.Add(new TravelCondition
                {
                    Travel = travel,
                    Condition = context.Conditions.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _travelConditions = null;
        }
    }
}