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 ProviderLogic : IProviderLogic
    {
        private readonly IProviderStorage _providerStorage;

        public ProviderLogic(IProviderStorage providerStorage)
        {
            _providerStorage = providerStorage;
        }

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

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

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

        private void CheckModel(ProviderBindingModel 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 поставщика", nameof(model.Name));
            }
            if (string.IsNullOrEmpty(model.Address))
            {
                throw new ArgumentNullException("Нет адресса", nameof(model.Address));
            }
            var element = _providerStorage.GetElement(new ProviderSearchModel
            {
                Name = model.Name,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Поставщик с таким названием уже есть");
            }
        }

        public List<ProviderViewModel>? ReadList(ProviderSearchModel? model)
        {
            var list = (model == null) ? _providerStorage.GetFullList() : _providerStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }        
            return list;
        }

        public ProviderViewModel? ReadElement(ProviderSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _providerStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }
    }
}