using RestaurantContracts.BindingModels;
using RestaurantContracts.BusinessLogicsContracts;
using RestaurantContracts.SearchModels;
using RestaurantContracts.StoragesContracts;
using RestaurantContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RestaurantBusinessLogic.BusinessLogics
{
    public class ComponentLogic : IComponentLogic
    {
        private readonly IComponentStorage _componentStorage;

        public ComponentLogic(IComponentStorage componentStorage)
        {
            _componentStorage = componentStorage;
        }

        public bool Create(ComponentBindingModel model)
        {
            CheckModel(model);
            if (_componentStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Delete(ComponentBindingModel model)
        {
            CheckModel(model, false);
            if (_componentStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public ComponentViewModel? ReadElement(ComponentSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _componentStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<ComponentViewModel>? ReadList(ComponentSearchModel? model)
        {
            var list = model == null ? _componentStorage.GetFullList() : _componentStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public bool Update(ComponentBindingModel model)
        {
            CheckModel(model);
            if (_componentStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        private void CheckModel(ComponentBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Нет названия компонента", nameof(model.Name));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Нет цены у компонента", nameof(model.Price));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Нет количества у компонента", nameof(model.Count));
            }
            var element = _componentStorage.GetElement(new ComponentSearchModel
            {
                Name = model.Name,
                
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Компонент с таким логином уже есть");
            }
        }
    }
}