namespace CPUSimulation
{
    public class CU // Control Unit
    {
        int numberOfRegisters = 16;
        Dictionary<string, string> _instructionSet;
        Dictionary<string, Word> _registers;
        public CU(int numberOfMemoryBanks)
        {

            _instructionSet = new Dictionary<string, string>();
            _instructionSet.Add("00000", "NOP");
            _instructionSet.Add("00001", "LOAD");
            _instructionSet.Add("00010", "STORE");
            _instructionSet.Add("00011", "ADD");
            _instructionSet.Add("00100", "SUB");
            _instructionSet.Add("00101", "JUMP");
            _instructionSet.Add("00110", "JUMPIFZERO");
            _instructionSet.Add("00111", "JUMPIFNEG");
            _instructionSet.Add("01000", "AND");
            _instructionSet.Add("01001", "OR");
            _instructionSet.Add("01010", "XOR");
            _instructionSet.Add("01011", "NOT");
            _instructionSet.Add("01100", "SHL");
            _instructionSet.Add("01101", "SHR");
            _instructionSet.Add("01110", "INC");
            _instructionSet.Add("01111", "DEC");

            _registers = new Dictionary<string, Word>();
            Word zeroWord = new Word(new Byte[2] { new Byte("00000000"), new Byte("00000000") });
            for (int i = 0; i < numberOfRegisters; i++)
            {   
                string registerName = ((byte)i).ToString().Substring(4, 4);
                _registers.Add(registerName, zeroWord);
            }

        }

        internal class ProgramCounter
        {
            Int16 _value;
            public ProgramCounter()
            {
                _value = 0;
            }
            public void Increment()
            {
                _value++;
            }
            public void SetValue(string value)
            {
                _value = Convert.ToInt16(value, 2);
            }
            public string GetValue()
            {
                return Utils.Int16ToBinaryString(_value);
            }
        }
    }
}