using CarShowroomContracts.BusinessLogic;
using CarShowroomContracts.StorageContracts;
using CarShowroomDataModels.Dtos;
using CarShowroomDataModels.SearchModel;
using CarShowroomDataModels.Views;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarShowroomBusinessLogic.BusinessLogic
{
    public class SaleLogic : ISaleLogic
    {
        private readonly ISaleStorage _saleStorage;

        public SaleLogic(ISaleStorage storage)
        {
            _saleStorage = storage;
        }

        public List<SaleView>? ReadList(SaleSearch? model)
        {
            var list = model == null ? _saleStorage.GetFullList() : _saleStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public SaleView? ReadElement(SaleSearch model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _saleStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public bool Create(SaleDto model)
        {
            CheckModel(model);
            model.SaleTime = DateTime.Now;
            if (_saleStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

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

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

        private void CheckModel(SaleDto model, bool withParams = true)
        {
            if (model == null)
                throw new ArgumentNullException(nameof(model));
            if (!withParams)
                return;
            if (model.Cost < 0)
                throw new InvalidOperationException();
            if (model.EmployeeId < 0)
                throw new InvalidOperationException();
            if (model.ClientId < 0)
                throw new InvalidOperationException();
        }
    }
}