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

namespace DatabaseImplement.Implements
{
	public class ProductStorage : IProductStorage
	{
		public ProductBindingModel? Delete(ProductSearchModel model)
		{
			if (model.Id is null && model.Name is null && model.Price is null && model.Rate is null)
			{
				return null;
			}

			var context = new Database();
			var product = context.Products.FirstOrDefault(p =>
				(model.Id.HasValue && p.Id == model.Id) || (!string.IsNullOrEmpty(p.Name) && p.Name.Contains(model.Name)));

			if (product is null)
			{
				return null;
			}
			context.Remove(product);
			context.SaveChanges();

			return product.GetBindingModel();
		}

		public ProductBindingModel? GetElement(ProductSearchModel model)
		{
			if (model.Id is null && string.IsNullOrWhiteSpace(model.Name))
			{
				return null;
			}
			var context = new Database();
			return context.Products
				.FirstOrDefault(prod => (model.Id.HasValue && prod.Id == model.Id)
					|| (!string.IsNullOrWhiteSpace(model.Name) && prod.Name.Contains(model.Name)))?.GetBindingModel();
		}

		public IEnumerable<ProductBindingModel> GetList(ProductSearchModel? model)
		{
			if (model.Id is null && string.IsNullOrWhiteSpace(model.Name) || model.RateFrom > model.RateTo)
			{
				return null;
			}
			var context = new Database();
			return context.Products
				.Where(prod => (model.Id.HasValue && prod.Id == model.Id)
					|| (!string.IsNullOrWhiteSpace(model.Name) && prod.Name.Contains(model.Name))
					|| ((model.RateFrom.HasValue && model.RateTo.HasValue) && ((model.RateFrom < prod.Rate && prod.Rate < model.RateTo)))
					|| ((model.PriceFrom.HasValue && model.PriceTo.HasValue) && ((model.PriceFrom < prod.Price && prod.Price < model.PriceTo))))
				.Select(r => r.GetBindingModel()); ;
		}

		public ProductBindingModel? Insert(ProductBindingModel model)
		{
			throw new NotImplementedException();
		}

		public ProductBindingModel? Update(ProductBindingModel model)
		{
			throw new NotImplementedException();
		}
	}
}