static void Main()
        {
            // Create an instance of the GSM class
            Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("en-GB");
            Display display = new Display(2.5F, "256K");
            Battery battery = new Battery(950, 35, BatteryType.LiIon);
            GSM gsmTest = new GSM("Samsung Ace", "Samsung Group", 545.00M, "Ivan Ivanov", battery, display);

            //Add few calls
            DateTime date = DateTime.Now;
            gsmTest.AddCallInHistory(date, "0889909988", 65);
            gsmTest.AddCallInHistory(date.AddHours(1), "0889969988", 25);
            gsmTest.AddCallInHistory(date.AddHours(2), "0883909988", 3600);
            gsmTest.AddCallInHistory(date.AddHours(6.5), "0889969988", 1000);

            //Display the information about the calls.
            Console.WriteLine("Print the call hisory of phone {0}", gsmTest.ModelOfGSM);
            Console.WriteLine(gsmTest.PrintCallHistory());

            //Assuming that the price per minute is 0.37 calculate and print the total price of the calls in the history
            //use readonly modificator about pricePerminute
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("Total price of calls is: {0}", gsmTest.CalcucateTotalPrice(0.37M));

            Console.ForegroundColor = ConsoleColor.Gray;
            //Remove the longest call from the history and calculate the total price again.
            gsmTest.RemoveCallByLongestDuration();
            Console.WriteLine(gsmTest.PrintCallHistory());

            //Finally clear the call history and print it.
            gsmTest.ClearCallHistory();
            Console.WriteLine(gsmTest.PrintCallHistory());
        }

    static void Main()
    {
        DateTime date1 = new DateTime(2013, 5, 24, 11, 11, 30);
        DateTime date2 = new DateTime(2013, 5, 24, 15, 23, 2);
        DateTime date3 = new DateTime(2013, 5, 31, 9, 00, 00);
        DateTime date4 = new DateTime(2013, 5, 31, 18, 12, 20);

        Call call1 = new Call(date1, "0888313233", 850);
        Call call2 = new Call(date2, "0888909090", 95);
        Call call3 = new Call(date3, "0889556677", 213);
        Call call4 = new Call(date4, "0888313233", 37);

        Battery battery = new Battery ("PX8", BatteryType.LiIon, 300, 8);
        Display display = new Display(4, 16000000);
        GSM gsm = new GSM("I900", "Samsung", 500, "Me", battery, display);

        gsm.AddCalls(call1);
        gsm.AddCalls(call2);
        gsm.AddCalls(call3);
        gsm.AddCalls(call4);

        foreach (var call in gsm.CallHistory)
        {
            Console.WriteLine(call);
        }

        Console.WriteLine("Total amount to pay: {0:C}",gsm.TotalCallsPrice);

        gsm.DeleteCalls(call1);
        Console.WriteLine("Total amount to pay: {0:C}", gsm.TotalCallsPrice);

        gsm.ClearHistory();
        Console.WriteLine("Total amount to pay: {0:C}", gsm.TotalCallsPrice);
    }

 public GSM(string model, string manufacturer, decimal? price, string owner, Battery battery, Display display)
     : this(model, manufacturer, price)
 {
     this.owner = owner;
     this.Battery = battery;
     this.Display = display;
 }

        public void CreatingBatterytWithValidDataShouldSetAllPropertiesCorrectly()
        {
            var battery = new Battery("8 cells", 4.5);

            Assert.AreEqual("8 cells", battery.Description, "Battery description name is set wrong");
            Assert.AreEqual(4.5, battery.LifeInHours, "Battery life in hours description is set wrong");
        }

    static void Main()
    {
        Console.OutputEncoding = System.Text.Encoding.UTF8;

        Battery bat = new Battery(48, 49, "bat11");
        Display dis = new Display(48502);
        GSM phone1 = new GSM("5800", "Nokia", 850, null, bat, dis);
        Console.WriteLine(phone1.Battery.HoursTalk);
        Console.WriteLine(phone1.Display.Height);
        Console.WriteLine(phone1.Display.Colors);

        bat.BatteryType = BatteryType.NiCd;
        Console.WriteLine(bat.BatteryType);
        Battery bat2 = new Battery(48, 52, "dada", BatteryType.NiMH);
        Console.WriteLine(bat2.BatteryType);

        Console.WriteLine(phone1);

        Console.WriteLine();
        Console.WriteLine(GSM.Iphone4S);
        GSM phone2 = new GSM("Galaxy", "Samsung");

        GSM[] phones = new GSM[] {
            phone1,
            phone2
        };

        for (int i = 0; i < phones.Length; i++)
        {
            Console.WriteLine(phones[i]);
        }
    }

    static void Main()
    {
        var battery = new Battery("Li-Ion, 4-cells, 2550 mAh", "4.5 hours");
        var laptop = new Laptop("Lenovo Yoga 2 Pro", "2259.00 lv.", "Intel HD Graphics 4400", "128GB SSD", battery);

        Console.WriteLine(laptop.ToString());
    }

 public Laptop(string model, string manufacturer, Battery elements, double price)
 {
     this.Model = model;
     this.Price = price;
     this.Manufacturer = manufacturer;
     this.SetElements(elements);
 }

 public Laptop(string model, string price, string graphicsCard, string hdd, Battery battery)
     : this(model, price)
 {
     this.GraphicsCard = graphicsCard;
     this.HDD = hdd;
     this.Battery = battery;
 }

    static void Main()
    {
        //creating array of GSM phones, adding info about them
        Console.WriteLine("Mobile phones: ",  Console.ForegroundColor = ConsoleColor.Red);
        GSM[] telephones = new GSM[3];
        Console.ForegroundColor = ConsoleColor.Gray;
        Battery battery = new Battery("helolModel", 1500, 1000, BatteryType.LiIon);
        Display display = new Display("100x85", 256);

        GSM phoneOne = new GSM("s400", "Samsung", 500, "Rosen", battery, display);
        GSM phoneTwo = new GSM("Duos", "Samsung", 500, "Joro", battery, display);
        GSM phoneThree = new GSM("s800", "Samsung", 500, "Tanq", battery, display);

        telephones[0] = phoneOne;
        telephones[1] = phoneTwo;
        telephones[2] = phoneThree;

        //print the info for each phone from the array
        for (int i = 0; i < telephones.Length; i++)
        {
            Console.WriteLine(telephones[i]);
        }

        Console.WriteLine(GSM.IPhone4S.Model);
        Console.WriteLine(GSM.IPhone4S.Manufacturer);
        Console.WriteLine("\nHistory information: \n",
        Console.ForegroundColor = ConsoleColor.Red);
        //go to next Test.cs class
        GSMCallHistoryTest.Main2();
    }

 static void Main()
 {
     Display testDisplay = new Display(14, 16.5f);
         Battery testBattery = new Battery("test");
         GSM myPhone = new GSM("test", "test", "Owner",1234, testBattery, testDisplay);
         Console.WriteLine(myPhone.display.Size);
 }

    private static void Main()
    {
        // Generate some test batteries and displays
        var premiumDisplay = new Display(4.5, Display.ColorDepth._32Bit);
        var mediocreDisplay = new Display(3.5, Display.ColorDepth._16Bit);
        var poorDisplay = new Display(2.5, Display.ColorDepth._8bit);
        var premiumBattery = new Battery("Sanyo-SN532e", 120, 20, Battery.Type.LiPol);
        var mediocreBattery = new Battery("Shanzungmang-2341", 80, 15, Battery.Type.LiIon);
        var poorBattery = new Battery("Mistucura-1224fe", 40, 5, Battery.Type.NiMH);

        // initilize gsms in the array
        var gsmArray = new GSM[4];
        gsmArray[0] = new GSM("One", "HTC", "Kiro", premiumDisplay, premiumBattery, 200);
        gsmArray[1] = new GSM("Blade", "Zte");
        gsmArray[2] = new GSM("Galaxy S4", "Samsung", "Misho", premiumDisplay, mediocreBattery, 1000);
        gsmArray[3] = new GSM("Ascend G600", "Huawei",  "Mtel", premiumDisplay, 
            new Battery("Toshiba-tbsae", 380, 6, Battery.Type.LiPol), 600);

        // print the gsms
        foreach (var phone in gsmArray)
        {
            Console.WriteLine(phone);
        }

        // print the static property Iphone4S
        Console.WriteLine(GSM.Iphone4S);

        // test GsmCallHistory
        GSMCallHistoryTest.Test();
    }

    static void Main(string[] args)
    {
        GSM[] gsmArray = new GSM[3];

            Battery myBattery = new Battery("Nokia", 50,50, BatteryType.LiIon);
            Display myDisplay = new Display(10, 1000000);
            GSM firstGsm = new GSM("N8", "Nokia", 500, "Me", myBattery, myDisplay);
            gsmArray[0] = firstGsm;

            myBattery = new Battery("Samsung", 60, 60, BatteryType.NiCd);
            myDisplay = new Display(12, 1200000);
            GSM secondGsm = new GSM("Galaxy", "Samsung", 700, "Me", myBattery, myDisplay);
            gsmArray[1] = secondGsm;

            myBattery = new Battery("HTC", 40, 40, BatteryType.NiMH);
            myDisplay = new Display(8, 800000);
            GSM thirdGsm = new GSM("K8", "HTC", 450, "Me", myBattery, myDisplay);
            gsmArray[2] = thirdGsm;

            foreach (var item in gsmArray)
            {
                Console.WriteLine(item);
                Console.WriteLine();
            }
            Console.WriteLine(GSM.IPhone4S);

            GSMCallHistoryTest.Test();
    }

        static void Main(string[] args)
        {
            try
            {
                //Create battery and display for the GSM
                Battery battery = new Battery("BL-5C",360,7,Battery.BatteryType.LithiumLon);
                Display display = new Display(3,65536);
                //Create GSM
                GSM gsm = new GSM("1208", "nokia", 50, "Georgi", battery, display);
                //Console.WriteLine(gsm.ToString()); //Print GSM data

                //Mace some calls and print the history
                gsm.AddCall(new Call(new DateTime(2013, 02, 22, 19, 01, 22), "00359888888888", 200));
                gsm.AddCall(new Call(new DateTime(2013,02,22,20,02,33),"0887888888",302));
                gsm.AddCall(new Call(new DateTime(2013, 02, 22, 20, 30, 19), "0889-88-88-88", 178));
                gsm.PrintCallHistiry();
                //Calculate the price of all calls
                decimal price = 0.37m;
                gsm.CalculateTotalCallsPrice(price);

                //Remove the longest call and calculate the price again
                gsm.DeleteCall(1); //The calls in the list start from 0, so the second call(longest) is 1
                gsm.CalculateTotalCallsPrice(price);

                //Clear the history and print it
                gsm.ClearCallHistory();
                gsm.PrintCallHistiry();

            }
            catch (Exception ex)
            {

                Console.WriteLine("Error!"+ex.Message);
            }
        }

 public RechargeAction(EndeavourFactory factory, RobotController controller, List<Goal> goals, Dictionary<TagEnum, Tag> tagMap, Battery battery)
     : base(factory, controller, goals, tagMap)
 {
     powerStation = getTagOfType<Tag>(TagEnum.PowerStation);
     this.name = "recharge";
     this.battery = battery;
 }

        public void updateBatteries()
        {
            //Create a Dictionary to hold the batteries saved in the database
            Dictionary<string, Battery> batteries = new Dictionary<string, Battery>();

            //Create a new connection to the database
            using (SQLiteConnection m_dbConnection = new SQLiteConnection(@"Data Source=database.sqlite;Version=3;"))
            {
                //Open database connection
                m_dbConnection.Open();


                using (SQLiteCommand command = m_dbConnection.CreateCommand())
                {
                    //Select everything from the 'batteries' table
                    SQLiteCommand getBatteries = new SQLiteCommand("SELECT * FROM batteries", m_dbConnection);
                    SQLiteDataReader reader = getBatteries.ExecuteReader();

                    //Read every entry in the batteries table
                    while (reader.Read())
                    {
                        string name = (string)reader["name"];
                        Battery battery = new Battery((string)reader["name"], (int)reader["weight"], (int)reader["capacity"], (string)reader["configuration"], (int)reader["discharge"], (int)reader["peakDischarge"]);
                        //Add the battery into the dictionary using the name as the key and a new Battery object as the value
                        batteries.Add(name, battery);
                    }
                }
                //Close the database connection
                m_dbConnection.Close();
            }
            //Save the updated savedBattery list 
            savedBatteries = batteries;
        }

        public BatteryData GetCurrentState()
        {
            if (battery == null)
            {
                battery = Battery.GetDefault();
            }

            BatteryData data = new BatteryData();
            data.BatteryLife = battery.RemainingChargePercent;
            TimeSpan dischargeTime = battery.RemainingDischargeTime;

            if (dischargeTime.Days < 1000)
            {
                data.BatteryLifeTime = battery.RemainingDischargeTime;
                data.BatteryState = BatteryState.Discharging;
            }
            else
            {
                // High discharge time means phone is charging.
                data.BatteryState = BatteryState.Charging;
            }

            // Notify only when values changes. GetCurrentState can be called manually.
            if (lastBatteryData == null || data.BatteryLife != lastBatteryData.BatteryLife || data.BatteryLifeTime != lastBatteryData.BatteryLifeTime || data.BatteryState != lastBatteryData.BatteryState)
            {
                BatteryStateChanged?.Invoke(this, new BatteryStateChangedEventArgs(data));
            }

            lastBatteryData = data;

            return data;
        }

        static void Main()
        {
            GSM[] mobilePhones = new GSM[3];

            GSM nokia = new GSM("3310", "Nokia");

            nokia.AddHistory(DateTime.Now, 0998080907, 1.08);
            nokia.AddHistory(DateTime.Now, 0998080907, 2132331.08);
            nokia.DeleteHistory(1);

            Battery sonyBattery5511 = new Battery("77ds7", 220, 10, BatteryType.NiMH);
            Display sonyDisplay5511 = new Display(23, 128);
            GSM sony = new GSM("5511", "Sony", 100.77m, "Pesho", sonyBattery5511, sonyDisplay5511);

            GSM samsung = new GSM("4433", "samsung", 50.22m, "Gosho");

            mobilePhones[0] = nokia;
            mobilePhones[1] = sony;
            mobilePhones[2] = samsung;

            //Console.WriteLine(nokia.CalcPriceHistory(2.2m));
            for (int i = 0; i < mobilePhones.Length; i++)
            {
                Console.WriteLine(mobilePhones[i]);
            }
        }

 //initialize the static iPhone GSM
 static GSM()
 {
     DisplaySize iPhoneDisplaySize = new DisplaySize(1136, 640);
     Display iPhoneDisplay = new Display(32000, iPhoneDisplaySize);
     Battery iPhoneBattery = new Battery("Samsung", 24, 24, BatteryType.LiIon);
     iPhone4S = new GSM("4S", "Apple", 1000000, iPhoneDisplay, iPhoneBattery);
 }

    public Laptop(string model,string manufacturer, string processor,
        int ram, string graphicCard, string hdd, double price, string batteryType, string batteryLife)
    {
        if (model == "" || manufacturer == "" ||
            processor == "" || graphicCard == "" || hdd == "")
        {
            throw new ArgumentException("Some empty laptop value except battery");
        }
        else if (ram < 0 || price < 0)
        {
            throw new ArgumentException("HDD space or price can't be negative");
        }
        else
        {
            this.model = model;
            this.manufacturer = manufacturer;
            this.processor = processor;
            this.ram = ram;
            this.graphicCard = graphicCard;
            this.hdd = hdd;
            this.price = price;

            this.battery = new Battery();
            this.battery.BatteryType = batteryType;
            this.battery.BatteryLife = batteryLife;
        }
    }

 public Battery(Battery battery)
 {
     this.model = battery.model;
     this.hoursTalk = battery.hoursIdle;
     this.hoursTalk = battery.hoursTalk;
     this.batteryType = battery.batteryType;
 }