using Contracts.BindingModels;
using Contracts.BusinessLogicContracts;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLogic
{
	public class ProductLogic : IProductLogic
	{
		private readonly IProductStorage _ProductStorage;
		public ProductLogic(IProductStorage ProductStorage)
		{
			_ProductStorage = ProductStorage;
		}
		public void CreateOrUpdate(ProductBindingModel model)
		{
			var element = _ProductStorage.GetElement(
			   new ProductBindingModel
			   {
				   DeliveryDate = model.DeliveryDate,
				   Name = model.Name,
				   Manufacturers = model.Manufacturers,
				   Image = model.Image
			   });
			if (element != null && element.Id != model.Id)
			{
				throw new Exception("Клиент с таким именем уже существует");
			}
			if (model.Id.HasValue)
			{
				_ProductStorage.Update(model);
			}
			else
			{
				_ProductStorage.Insert(model);
			}
		}

		public void Delete(ProductBindingModel model)
		{
			var element = _ProductStorage.GetElement(new ProductBindingModel { Id = model.Id });
			if (element == null)
			{
				throw new Exception("Клиент не найден");
			}
			_ProductStorage.Delete(model);
		}

		public List<ProductViewModel> Read(ProductBindingModel model)
		{
			if (model == null)
			{
				return _ProductStorage.GetFullList();
			}
			if (model.Id.HasValue)
			{
				return new List<ProductViewModel> { _ProductStorage.GetElement(model) };
			}
			return _ProductStorage.GetFilteredList(model);
		}

		public List<(int, double)> GetWordInfo()
		{
			var data = _ProductStorage.GetProductCountByManufacturer();

			return data
				.Select((g, index) => (Index: index + 1, Value: (double)g.Count))
				.ToList();
		}
	}
}