static bool ShopsHaveElectricKettle(List <Shop> shops, ElectricKettle electricKettle)
        {
            bool shopsContainElectricKettle = true;

            foreach (var shop in shops)
            {
                if (!shop.HasElectricKettle(electricKettle))
                {
                    shopsContainElectricKettle = false;
                }
            }

            return(shopsContainElectricKettle);
        }
        static ElectricKettle GetCheapestAPlusElectricKettle(List <Shop> shops)
        {
            var cheapestElectricKettle = new ElectricKettle();

            foreach (var shop in shops)
            {
                var electricKettle = shop.GetCheapestAPlusElectricKettle();

                if (electricKettle != null)
                {
                    if (cheapestElectricKettle.Price == 0)
                    {
                        cheapestElectricKettle = electricKettle;
                    }
                    else if (electricKettle.Price < cheapestElectricKettle.Price)
                    {
                        cheapestElectricKettle = electricKettle;
                    }
                }
            }

            return(cheapestElectricKettle.Price == 0 ? null : cheapestElectricKettle);
        }
        static Shop GetShopFromFile(string path)
        {
            var shop = new Shop();

            using (var reader = new StreamReader(path))
            {
                shop.Name    = reader.ReadLine();
                shop.Address = reader.ReadLine();
                shop.Phone   = reader.ReadLine();

                string line;

                while ((line = reader.ReadLine()) != null)
                {
                    var data = line.Split(';');

                    if (IsFridge(data))
                    {
                        var fridge = new Fridge()
                        {
                            Manufacturer     = data[0],
                            Model            = data[1],
                            EnergyClass      = data[2],
                            Color            = data[3],
                            Price            = double.Parse(data[4]),
                            Capacity         = double.Parse(data[5]),
                            InstallationType = data[6],
                            HasFreezer       = bool.Parse(data[7]),
                            Height           = double.Parse(data[8]),
                            Width            = double.Parse(data[9]),
                            Depth            = double.Parse(data[10])
                        };

                        shop.Fridges.Add(fridge);
                    }

                    if (IsMicrowaveOven(data))
                    {
                        var microwaveOven = new MicrowaveOven()
                        {
                            Manufacturer = data[0],
                            Model        = data[1],
                            EnergyClass  = data[2],
                            Color        = data[3],
                            Price        = double.Parse(data[4]),
                            Power        = double.Parse(data[5]),
                            ProgramCount = int.Parse(data[6])
                        };

                        shop.MicrowaveOvens.Add(microwaveOven);
                    }

                    if (IsElectricKettle(data))
                    {
                        var electricKettle = new ElectricKettle()
                        {
                            Manufacturer = data[0],
                            Model        = data[1],
                            EnergyClass  = data[2],
                            Color        = data[3],
                            Price        = double.Parse(data[4]),
                            Power        = double.Parse(data[5]),
                            Capacity     = double.Parse(data[6])
                        };

                        shop.ElectricKettles.Add(electricKettle);
                    }
                }
            }


            return(shop);
        }
 static void PrintElectricKettleToConsole(ElectricKettle electricKettle)
 {
     Console.WriteLine(electricKettle != null ? electricKettle.ToString() : "No electric kettle found!");
 }