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 ProductLogic : IProductLogic
    {
        private readonly IProductStorage _productStorage;

        public ProductLogic(IProductStorage productStorage)
        {
            _productStorage = productStorage;
        }

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

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

        public ProductViewModel? ReadElement(ProductSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _productStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<ProductViewModel>? ReadList(ProductSearchModel? model)
        {
            var list = model == null ? _productStorage.GetFullList() : _productStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public bool Update(ProductBindingModel model)
        {
            CheckModel(model);
            if (_productStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }

        private void CheckModel(ProductBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Type))
            {
                throw new ArgumentNullException("Нет вида продукта", nameof(model.Type));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Нет цены у продукта", nameof(model.Price));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Нет количества у продукта", nameof(model.Count));
            }
            var element = _productStorage.GetElement(new ProductSearchModel
            {
                Type = model.Type,

            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Компонент с таким логином уже есть");
            }
        }
    }
}