using System;
using System.Collections.Generic;
using System.Text;

namespace Sunweaver.VM
{
    public class VirtualMachine
    {
        public VirtualMachine(Memory memory) : this(null, memory)
        {

        }

        public VirtualMachine(Chromosome chromosome, Memory memory)
        {
            Memory = memory;
            CallingChromosome = chromosome;
        }

        public VirtualMachine() : this(null, new Memory())
        {

        }

        /// <summary>
        /// A stack of integers used for DNA manipulations.  We use 64 bit integers
        /// so we can minimize issues of overflow.
        /// </summary>
        public IntStack Stack = new IntStack();

        /// <summary>
        /// A stack of booleans used for conditions
        /// </summary>
        public BoolStack BoolStack = new BoolStack();

        /// <summary>
        /// A temporary memory array that acts like a robots array
        /// </summary>
        public Memory Memory;

        /// <summary>
        /// Codule callstack.
        /// </summary>
        public Stack<int> CallStack = new Stack<int>(new int[] { 0 });

        /// <summary>
        /// Any codule calls will call in to the calling chromosome.
        /// </summary>
        public Chromosome CallingChromosome;

        /// <summary>
        /// How many base pairs have been executed against this Virtual Machine.
        /// </summary>
        public ulong ExecutedBP = 0;

        /// <summary>
        /// Controls wether DNA is executed or bypassed.  Toggled in DNA with start/stop
        /// </summary>
        public bool Executing = true;
    }
}