using System;
using System.Collections.Generic;
using System.Reflection.Emit;
using System.Text;
using Sunweaver.Commands.Attributes;
using Sunweaver.VM;

namespace Sunweaver.Commands
{
    //No base pair attribute on purpose
    /// <summary>
    /// A numerical constant between [
    /// <see cref="M:Sunweaver.Commands.Constant.MinValue"/>,
    /// <see cref="M:Sunweaver.Commands.Constant.MaxValue"/>
    /// ].
    /// </summary>
    public class Constant : BasePair
    {
        public const Int16 MaxValue = Memory.MaxAbsoluteMemoryValue;
        public const Int16 MinValue = -Memory.MaxAbsoluteMemoryValue;

        public Int16 number = 0;

        public Constant(Int16 num)
        {
            number = num;
        }

        public Constant(string word)
        {
            Int16.TryParse(word, out number);
        }

        public override void Implementation(VirtualMachine VM)
        {
            VM.Stack.Push(GetNumber());
        }

        public int GetNumber()
        {
            return number;
        }

        public override string ToString()
        {
            return GetNumber().ToString();
        }

        internal override void Compile(ILGenerator il, Locals locals)
        {
            throw new NotImplementedException();
        }
    }
}